Specifications

ManualsBrandsMitsubishi Manualsaudio & home theatreHS-U778

SPECIFICATIONS

Tape Format

Power Source

Power Consumption

Video Signal System

Video Recording System

Luminance

Color Signal

Hi-Fi Audio

Recording System

Linear Audio Track

Tape Speed

Record/Playback Time

Heads: Video

Hi-Fi Audio

Audio/Control

Erase

Video Input

Audio Input

Video Output

Audio Output

Tuner VHF

UHF

CATV

Operating Temperature

Relative Humidity

RF Channel Output

Weight

Dimensions

Timer Program Capacity

Deck

: S-VHS/VHS 1/2” high-density

video cassette tape

: 120V AC ; 60 Hz

: Approx. 25 W

EIA standard ;

NTSC color

: S-VHS standard

: Frequency modulation recording

: Low frequency conversion

sub-carrier phase shift recording

: VHS standard

Azimuth helical scanning system

: 1 track

: 1-5/16 i.p.s (standard play)

7/16 i.p.s (extended play)

: 120min. with T-120 video

cassette (SP mode)

360min. with T-120 video

cassette (EP mode)

: 4 rotary heads

: 2 rotary heads

: 1 stationary head

: 1 full track head

: 0.5 to 2.0 V(p-p), 75Ω

unbalanced RCA pin Jack

: 346 mV(rms), 47 kΩ

unbalanced RCA pin Jack

: 1.0 V(p-p), 75 Ω unbalanced

RCA pin Jack

: 346 mV(rms), 1 kΩ unbalanced

RCA pin Jack

: 54~88 MHz, 174~216 MHz

: 470~806 MHz

: 54~88 MHz, 90~804 MHz

: 41 °F to 104 °F

: 30 % to 80 %

: Channel 3 or 4 switchable

: Approx. 8.4 lbs

: 16.7”(W) × 3.7”(H) × 11.8”(D)

: 1 month programmable

/ 8 programs

: α Deck

• Weight and dimensions shown are approximate.

• Design and specifications are subject to change without notice.

Only cassettes marked S-VHS or VHS can be used with this video cassette recorder.

MITSUBISHI

2002

VIDEO CASSETTE RECORDER

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.

9351 Jeronimo Ave. Irvine, California 92618 U.S.A.

MODEL

HS-U778

Summary of content (84 pages)

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2002 MITSUBISHI VIDEO CASSETTE RECORDER MODEL HS-U778 Only cassettes marked S-VHS or VHS can be used with this video cassette recorder. SPECIFICATIONS Tape Format Power Source Power Consumption Video Signal System Video Recording System Luminance Color Signal Hi-Fi Audio Recording System Linear Audio Track Tape Speed Record/Playback Time Heads: Video Hi-Fi Audio Audio/Control Erase : S-VHS/VHS 1/2” high-density video cassette tape : 120V AC ; 60 Hz : Approx.
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CONTENTS – FILE “COVERPGE” – SPECIFICATIONS ...........................................................1 CONTENTS......................................................................2 GLOSSARY OF ABBREVIATIONS ................................4 2-15 – FILE “DISASSY” – SAFETY PRECAUTIONS ................................................1 CONNECTION .................................................................3 DISASSEMBLY ...............................................................
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CONTENTS 3-2-1 GUIDE ROLLER Adjustment Check ............31 3-2-2 Height Adjustment of GUIDE ROLLER (SP) ..................................31 3-2-3 Height Adjustment of GUIDE ROLLER (TU) ..................................31 3-2-4 Coarse Adjustment of Phase .......................32 3-2-5 Flatness Check of FM Waveform.................32 3-2-6 Tape Running Condition at the GUIDE ROLLERs (Check1) ...............33 3-2-7 Tape Running Condition at the GUIDE ROLLERs (Check 2) ..............
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GLOSSARY OF ABBREVIATIONS A/C A-PB A-REC AE AENV AFC AFF AFTV ALC AMODE AMPC APC ATFN ATT : Audio/Control : Audio Play Back : Audio Recording : Audio Erase : Audio Envelope : Automatic Frequency Control : Audio Flip Flop : Auto Fine Tuning Voltage : Automatic Level Control : Audio Mode : Amplifier Alternating Current Ground : Automatic Phase Control : Auto Fine : Attenuator BLMUTE : Blue Back Mute C/N CCD CG-CS CHSW CLKSEL CNTR COM CONV SW CP-FG CP-REV CPMOTORV CROT CSYNC CTL : Carrier/Noise Ratio : Ch
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SAFETY PRECAUTIONS INTRODUCTION SAFETY NOTICE This manual provides service information for the adjustments of mechanical and electrical operations. Due to design modifications, the servicing procedures and data given in this manual are subject to possible change without prior notice. Before returning VCR to the customer a safety check of the entire VCR should be made.
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2. Hot Check The test sequence, with reference to the measuring circuit in the figure is as follows: (1) With switch S1 open, connect the VCR to the measuring circuit. Immediately after connection, measure the leakage current using both positions of switch S2 and with the switching devices in the VCR in all of their operating positions.
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CONNECTION Now that you’ve completed the antenna connections to your VCR, you’re ready to connect the VCR to the TV. Because every television is different (especially older model TVs), your VCR may need to be connected in a variety of ways. See the Owner’s Manual for Instruction Information ON: • Determining if you need a splitter, • Connecting TVs with audio and video inputs. Connecting separate antennas (UHF/VHF) Connecting the Television To connect separate UHF/VHF antennas to the VCR: 1.
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DISASSEMBLY 1. Removal of Top Cover 1. Remove the two Top Cover fastening screws (a) shown in Fig. 1 and remove the Top Cover in the direction shown by arrow. Top Cover a 2. Removal of Front Panel 1. Remove the Top Cover. (Refer to Para. 1 of the DISASSEMBLY.) 2. Unfasten the seven catches (b) shown in Fig. 1 and remove the Front Panel in the direction shown by arrows. a b b b Front Panel Fig.
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3. Removal of Bottom Panel 1. Remove the two fastening screws (a) shown in Fig. 2. 2. Turn the set upside down as shown in Fig. 3. 3. Slide the Bottom Panel backward to remove it, taking care of the four catches (b). a Fig. 2 b Bottom Panel Fig.
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4. Removal of DECK ASSY 1. Remove the Top Cover. (Refer to Para. 1 of the DISASSEMBLY.) 2. Remove the Front Panel. (Refer to Para. 2 of the DISASSEMBLY.) 3. Short-circuit the cathode side of D927 and the GND of the DECK ASSY using the jig shown below. Note: The CAPSTAN MOTOR may be damaged without above short circuit. 4. Remove the two screws (a) shown in Fig. 4 and raise the Shield Cover to remove it. 5. Remove the four screws (b) shown in Fig. 5. 6. Disconnect the Connectors MA, MD, MH and ML. 7.
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HOW TO EXECUTE CIRCUIT BOARD SERVICE CAUTION: BEFORE ATTEMPTING TO REMOVE OR REPAIR ANY PCB, UNPLUG THE POWER CORD FROM THE A.C. SOURCE. PCB-JACK PCB-SIGNAL PCB-MAIN LOCATION OF PRINTED CIRCUIT BOARDS Note : • Take caution when removing flat cables to prevent any contact problem. • Connect and disconnect the flat cables at right angles to the connector and make sure that it is completely secured. • After servicing the PCB, restore the flat cable and leads to their former state. PCB-OPE Fig. 6 1.
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3. PCB-MAIN a 1. Remove the Bottom Panel. (Refer to Para. 3 of the DISASSEMBLY.) 2. Remove the DECK ASSY. (Refer to Para. 4 of the DISASSEMBLY.) 3. Remove the three screws (a) shown in Fig. 9. 4. Remove the Holder for the AC Power Cord from the Base Chassis shown in Fig. 10. 5. Release the two fastening catches (b) shown in Fig. 9. Raise the PCB-MAIN to remove it. 6. Unfasten the fastening five screws (C) shown in Fig.11 and remove the Antenna Cover. 7.
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CHIP PARTS REPLACEMENT CHIP PARTS REPLACEMENT 2. Removal of Chip Parts (Transistors) Some resistors, shorting jumpers (0Ω resistor), ceramic capacitors, transistors and diodes are chip parts. When replacing these parts, note the following cautions. A. Melt the solder of one lead. Lift the side of that lead upward. B. Simultaneously melt the solder of the two remaining leads and lift the part from the PCB. Cautions : A.
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MECHANICAL ADJUSTMENT AND REPLACEMENT 1-2. Tape Running System 1. DECK Cleaning Clean the following Parts of the Tape Running System. 1. TENSION PIN 2. F/E HEAD 3. SLANT POLE (SP) 4. SLANT POLE (TU) 5. A/C HEAD 6. GUIDE POLE (TU) 7. PINCH ROLLER 8. GUIDE PIN (TU) 9. GUIDE ROLLER (SP) 10. UPPER / LOWER DRUM ASSY 11. GUIDE ROLLER (TU) 12. CAPSTAN SHAFT 13. IMPEDANCE UNIT (SP) 1.
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2. Replacement of Major Parts 2-1. CLEANING ARM, FELT RING b FELT RING SET POSITION : Normal b (Removal) a 1. Release the two catches (a) of the CLEANING ARM shown in the Fig. 2-1 to remove the CLEANING ARM. 2. Release the two catches (b) of the CLEANING ARM shown in the Fig. 2-1 to remove the FELT RING. CLEANING ARM a (Installation) 1. Install the FELT RING shown in the Fig. 2-1 to the CLEANING ARM. 2. Install the CLEANING ARM shown in the Fig. 2-1. Fig. 2-1 2-2.
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2-3. BOTTOM ASSY Hole in MAIN PLATE ASSY SET POSITION : Normal Remove the following part before replacing the BOTTOM ASSY. Refer to the corresponding item to install it. • STAY PLATE (Item 2-2) (Removal) 1. Move the WORM WHEEL in the Fig. 2-3-1 in the direction shown by the arrow A. And match the Boss a of the BOTTOM ASSY with the Hole in the MAIN PLATE ASSY. 2. Lift the BOTTOM ASSY in the Fig. 2-3-1 in the direction shown by the arrow B and pull it out in the direction shown by the arrow C.
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2-4. INSERT GUIDE (TU) a SET POSITION : Normal Remove the following parts before replacing the INSERT GUIDE (TU). Refer to the corresponding items to install them. • STAY PLATE (Item 2-2) • BOTTOM ASSY (Item 2-3) INSERT GUIDE (TU) (Removal) 1. Remove the screw (a) fastening the INSERT GUIDE (TU) shown in the Fig. 2-4 to remove the INSERT GUIDE (TU). (Installation) 1. Install the INSERT GUIDE (TU) shown in the Fig. 2-4. Fig. 2-4 2-5.
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2-6. REC HOLDER, REC LEVER, REC SPRING REC SPRING c REC LEVER SET POSITION : Upside down (Removal) 1. Remove the screw (a) fastening the REC HOLDER shown in the Fig. 2-6 to remove the REC HOLDER. 2. Release the REC SPRING shown in the Fig. 2-6 from the catch (b) of the REC HOLDER to remove the REC LEVER. 3. Release the two catches (c) of the REC LEVER shown in the Fig. 2-6 to remove the REC SPRING. a b REC HOLDER (Installation) 1. Install the REC SPRING shown in the Fig.
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2-8. A/C HEAD UNIT LEAD CONNECTOR SET POSITION : Normal (Removal) a 1. Remove the LEAD CONNECTOR of the A/C HEAD UNIT shown in the Fig. 2-8. 2. Remove the two screws (a) fastening the A/C HEAD UNIT shown in the Fig. 2-8 to remove the A/C HEAD UNIT. a A/C HEAD UNIT Head (Installation) 1. Install the A/C HEAD UNIT shown in the Fig. 2-8. Note : Never touch the Head of the A/C HEAD UNIT shown in the Fig. 2-8. Clean the dirt on the Head with alcohol if necessary. 2.
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2-10.SENSOR COVER (TU) SET POSITION : Normal (Removal) 1. Release the catch (a) of the SENSOR COVER (TU) shown in the Fig. 2-10 to remove the SENSOR COVER (TU). (Installation) 1. Install the SENSOR COVER (TU) shown in the Fig. 210. a SENSOR COVER (TU) Fig. 2-10 2-11. SENSOR COVER (SP) SET POSITION : Normal (Removal) 1. Remove the catch (a) of the SENSOR COVER (SP) shown in the Fig. 2-11 to remove the SENSOR COVER (SP). (Installation) 1. Install the SENSOR COVER (SP) shown in the Fig. 211.
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2-12.REV UNIT (TU), REV UNIT (SP) REV UNIT (TU) a SET POSITION : Upside down a (Removal) REV UNIT (SP) 1. Release the two catches (a) of the REV UNIT (TU) shown in the Fig. 2-12 to remove the REV UNIT (TU). 2. Release the two catches (b) of the REV UNIT (SP) shown in the Fig. 2-12 to remove the REV UNIT (SP). b (Installation) 1. Clean the dirt on the transparent part of the REV UNIT (TU) with a VIDEO HEAD cleaning cloth. Note : Never use solvent such as alcohol to clean the REV UNIT (TU). 2.
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2-14.REEL BELT, PULLEY BUSH, THRUST WASHER, BELT PULLEY, SHIFT SLIDER, PULLEY GEAR ASSY, SLIP GEAR, SLIP SPRING, SLIP 2 WASHER, THRUST WASHER, SLIP ADJUSTER, IDLER 2 UNIT REEL BELT a PULLEY BUSH THRUST WASHER BELT PULLEY SET POSITION : Upside down Pull in the direction (Removal) A of the Arrow (A) to remove it from the SHIFT LEVER. 1. Remove the REEL BELT shown in the Fig. 2-14-1. 2. Move the SHIFT SLIDER in the Fig.
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9. Install the units from the SLIP 2 WASHER to REEL BELT shown in the Fig. 2-14-1. Note1 : Be sure to replace the removed PULLEY BUSH with a new one. Note2 : Attach the SLIP SPRING with its straight end facing the SLIP GEAR side. Note3 : Attach the SLIP 2 WASHER with its position set as shown in the Fig. 2-14-5. Note4 : Apply GREASE (PG-641) [859D055O30] to the part on the SLIP 2 WASHER specified in the Fig. 2-14-5. 10. Install the SHIFT SLIDER to the SHIFT LEVER shown in the Fig. 2-14-1.
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2-15.CAPSTAN BRAKE SPRING, CAPSTAN BRAKE ASSY SET POSITION : Upside down CAPSTAN BRAKE ASSY a (Removal) 1. Remove the CAPSTAN BRAKE SPRING shown in the Fig. 2-15. 2. Remove the catch (a) of the CAPSTAN BRAKE ASSY shown in the Fig. 2-15 to remove the CAPSTAN BRAKE ASSY. CAPSTAN MOTOR CAPSTAN BRAKE SPRING (Installation) 1. Install the CAPSTAN BRAKE ASSY shown in the Fig. 2-15. 2. Install the CAPSTAN BRAKE SPRING shown in the Fig. 2-15. Fig.
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2-16.FC HOLDER, MOTOR HOLDER, LOADING WORM, LOADING MOTOR ASSY, WORM WHEEL LOADING MOTOR ASSY b b SET POSITION : Normal a a (Removal) 1. Release the two catches (a) of the FC HOLDER shown in the Fig. 2-16-1 to remove the FC HOLDER. 2. Remove the two screws (b) fastening the MOTOR HOLDER shown in the Fig. 2-16-1 to remove the MOTOR HOLDER. 3. Remove the two screws (c) fastening the LOADING MOTOR ASSY shown in the Fig. 2-16-1 to remove the LOADING MOTOR ASSY and LOADING WORM. 4. Remove the WORM WHEEL.
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2-17.PINCH ARM CAP, PINCH ASSY a SET POSITION : Normal PINCH ARM CAP (Removal) 1. Release the two catches (a) of the PINCH ARM CAP shown in the Fig. 2-17 to remove the PINCH ARM CAP. 2. Remove the PINCH ASSY shown in the Fig. 2-17. Part B Part A PINCH ASSY (Installation) 1. Insert Part A of the PINCH ASSY shown in the Fig. 217 in the most external groove of the MAIN CAM. 2. Install the PINCH ARM CAP matching the Part B of the PINCH ARM CAP with the Rib of the MAIN PLATE ASSY. MAIN CAM Rib Fig.
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3. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the points on the MAIN PLATE ASSY specified in the Fig. 2-18-1. 4. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the points on the DOOR ARM specified in the Fig. 218-1. 5. Install the DOOR ARM. 6. Match the Hole in the MAIN CAM with the Hole in the MAIN PLATE ASSY shown in the Fig. 2-18-2. 7. Install the F/L PLATE shown in the Fig. 2-18-1 from the front side (ARM (TU) side). 8. Insert the Boss of the F/L PLATE shown in the Fig.
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BRAKE SPRING C Insert the BRAKE SPRING under the Catch. Catch BRAKE (TU) Fig. 2-19-3 2-20.GUIDE LAMP SET POSITION : Normal Remove the following parts before replacing the GUIDE LAMP. Refer to the corresponding items to install them. • STAY PLATE (Item 2-2) • BOTTOM ASSY (Item 2-3) • MOTOR HOLDER (Item 2-16) • PINCH ARM CAP (Item 2-17) • PINCH ASSY (Item 2-17) • BRAKE CAM PLATE (Item 2-19) (Removal) 1. Release the catch (a) of the GUIDE LAMP shown in the Fig. 2-20. 2.
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2-21.MAIN CAM, GUIDE ARM (TU), BRAKE LEVER, LB PIN MAIN CAM SET POSITION : Normal Remove the following parts before replacing the MAIN CAM, GUIDE ARM (TU), BRAKE LEVER. Refer to the corresponding items to install them. • STAY PLATE (Item 2-2) • BOTTOM ASSY (Item 2-3) • SENSOR COVER (TU) (Item 2-10) • MOTOR HOLDER (Item 2-16) • WORM WHEEL (Item 2-16) • PINCH ARM CAP (Item 2-17) • PINCH ASSY (Item 2-17) • F/L PLATE (Item 2-18) BRAKE LEVER GREASE (MULTEMP AC-DM) A GUIDE ARM (TU) a LB PIN (Removal) 1.
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2-22.L/D LOCK LEVER SET POSITION : Normal Remove the following parts before replacing the L/D LOCK LEVER. Refer to the corresponding items to install them. • STAY PLATE (Item 2-2) • BOTTOM ASSY (Item 2-3) • MOTOR HOLDER (Item 2-16) • PINCH ARM CAP (Item 2-17) • PINCH ASSY (Item 2-17) • BRAKE CAM PLATE (Item 2-19) L/D LOCK LEVER (Removal) 1. Remove the L/D LOCK LEVER shown in the Fig. 2-22. (Installation) 1. Install the L/D LOCK LEVER shown in Fig. 2-22. 2-23.
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2-24. BELT LEVER, BELT ADJUSTER a SET POSITION : Normal Remove the following parts before replacing the BELT LEVER, BELT ADJUSTER. Refer to the corresponding items to install them. • STAY PLATE (Item 2-2) • BOTTOM ASSY (Item 2-3) • MOTOR HOLDER (Item 2-16) • PINCH ARM CAP (Item 2-17) • PINCH ASSY (Item 2-17) • BRAKE CAM PLATE (Item 2-19) • BRAKE BELT (SP) (Item 2-23) • BELT HOLDER (Item 2-23) BELT LEVER BELT ADJUSTER (Removal) 1. Release the catch (a) of the BELT LEVER shown in the Fig.
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(Installation) 1. Apply OIL (FLOIL 948P) [859D154O20] to the parts on the MAIN PLATE ASSY specified in the Fig. 2-25. 2. Install the REEL DISK (SP side). 3. Install the TENS AXIS HOLDER. Note : Install the TENS AXIS HOLDER so that the catch (a) for the TENSION ARM will be positioned on the front (F/L ARM ASSY side). 4. Install the TENSION LEVER. 5. Install the TENSION ARM. 6. Install the TENSION SPRING. Note : Install the longer hook of the TENSION SPRING to the TENSION ARM. BRAKE BELT (TU) 2-26.
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(Installation) Note : Install the BRAKE BELT (TU) so that its Felt Side touches the REEL DISK (TU side). The GREASE applied to the BRAKE CAM PLATE and the MAIN PLATE ASSY should not adhere on the Felt Side of the BRAKE BELT (SP). 1. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the parts on the MAIN PLATE ASSY specified in the Fig. 2-27. 2. Install the REEL DISK (TU side). 3. Install the BRAKE BELT (TU) to the BRAKE (TU). 4. Install the BRAKE (TU). 5. Hook the BRAKE BELT (TU) to the REEL DISK (TU side).
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2-29.CHARGE SPRING, SWING LEVER, CHARGE ASSY a CHARGE SPRING SET POSITION : Normal Remove the following parts before replacing the CHARGE SPRING, SWING LEVER, CHARGE ASSY. Refer to the corresponding items to install them. • STAY PLATE (Item 2-2) • BOTTOM ASSY (Item 2-3) • MOTOR HOLDER (Item 2-16) • PINCH ARM CAP (Item 2-17) • PINCH ASSY (Item 2-17) • BRAKE CAM PLATE (Item 2-19) (Removal) c CHARGE ASSY SWING LEVER b Front Back Both Sides (Front/Back) 1. Remove the CHARGE SPRING shown in the Fig.
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(Installation) 1. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the parts on the MAIN PLATE ASSY specified in the Fig. 2-30-1. 2. Apply GREASE (MULTEMP AC-DM)[859D055O90] to the parts on the LOADING ARM ASSY (TU) specified in the Fig. 2-30-2. 3. Install the LOADING ARM ASSY (SP) and LOADING ARM ASSY (TU) so that the Marks on the both UNITs face each other, as shown in the Fig. 2-30-3. Note : Be sure to replace the removed LOADING ARM ASSY (SP) with a new one.
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(Installation) A/L LEVER Note : Install the LOADING ARM ASSY (TU) and LOADING ARM ASSY (SP), according to the following procedure, after installing the A/L LEVER. 1. Apply GREASE (MOLYKOTE G PASTE) [859D055O50] to the parts on the MAIN PLATE ASSY specified in the Fig. 2-31-1. 2. Apply GREASE (MOLYKOTE G PASTE) [859D055O50] to the parts on the A/L LEVER specified in the Fig. 2-31-2. 3.
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2-32.TAPE GUIDE ASSY (SP), TAPE GUIDE ASSY (TU) TAPE GUIDE ASSY (TU) TAPE GUIDE ASSY (SP) SET POSITION : Normal Remove the following parts before replacing the TAPE GUIDE ASSY (SP), (TU). Refer to the corresponding items to install them. • STAY PLATE (Item 2-2) • BOTTOM ASSY (Item 2-3) • MOTOR HOLDER (Item 2-16) • PINCH ARM CAP (Item 2-17) • PINCH ASSY (Item 2-17) • BRAKE CAM PLATE (Item 2-19) • BRAKE BELT (SP) (Item 2-23) • BELT HOLDER (Item 2-23) • BELT LEVER (Item 2-24) • TENSION ARM (Item 2-25) Fig.
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2-33.DRUM CLAMPER, DRUM ASSY LEAD CONNECTOR SET POSITION : Normal b a (Removal) 1. Disconnect the LEAD CONNECTOR of the DRUM ASSY shown in the Fig. 2-33-1. 2. Remove the two screws (a, b) fastening the DRUM CLAMPER shown in the Fig. 2-33-1 to remove the DRUM ASSY with the DRUM CLAMPER. 3. Rotate the DRUM CLAMPER in the Fig. 2-33-2 in the direction shown by the arrow A to remove it from the DRUM ASSY. DRUM ASSY with DRUM CLAMPER (Installation) 1. Install the DRUM CLAMPER in the Fig.
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b Part A a C Reference Pin Reference Pin and Catch have to touch each other. Catch Fig. 2-33-3 2-34.DRUM MOTOR STATOR, BRUSH SPRING, SPACER, ROTOR CASE, END RING, BRUSH, UPPER DRUM ASSY Side View of END RING a DRUM MOTOR STATOR This side down. SET POSITION : Normal (Removal) 1. Disconnect the LEAD CONNECTOR of the DRUM ASSY shown in the Fig. 2-34-1. 2. Remove the two screws (a) fastening the DRUM MOTOR STATOR shown in the Fig. 2-34-1 to remove the DRUM MOTOR STATOR. 3.
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(Installation) 1. Install the SPACER shown in the Fig. 2-34-1. Note : Be sure to use the new SPACER packed with the new UPPER DRUM ASSY. 2. Install the UPPER DRUM ASSY shown in the Fig. 234-1. 3. Install the END RING so that the reference hole (A) of the END RING shown in the Fig. 2-34-2 will be placed in parallel with the Rear Line of the MAIN PLATE ASSY. (The reference hole (A) should be on the right when viewed from the bottom.) 4.
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(Installation) 1. Apply SILICON COMPOUND (SC102) [859D164O10] to the parts on the MAIN PLATE ASSY specified in the Fig. 2-35-3. 2. Install the CAPSTAN MOTOR. a WORM WHEEL A GUIDE ARM (TU) Arrow B CAPSTAN MOTOR Fig. 2-35-2 SILICON COMPOUND (SC102) MAIN PLATE ASSY Fig.
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2-36.IMPEDANCE UNIT (SP), FLYWHEEL (SP) SET POSITION : Normal FLYWHEEL (SP) (Removal) 1. Unfasten the two catches (a) on the IMPEDANCE UNIT (SP) shown in Fig. 2-36, and remove the FLYWHEEL (SP). 2. Remove the screw (b) on the IMPEDANCE UNIT (SP) shown in Fig. 2-36, and remove the IMPEDANCE UNIT (SP). a IMPEDANCE UNIT (SP) b (Installation) 1. Install the IMPEDANCE UNIT (SP) shown in Fig. 2-36. 2. Install the FLYWHEEL (SP) shown in Fig. 2-36. Fig. 2-36 2-37.
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3. Interchangeability Adjustment of the Mechanism Note 1 : Tracking may need to be preset during interchangeability adjustment of the mechanism. Digital tracking is preset by short circuiting TP5A and TP5B on the PCB-MAIN. Note 2 : The adjustments are performed in the PLAYBACK mode, using the staircase signal of an alignment tape,unless otherwise specified.Connect an oscilloscope to TP2A and externally trigger from TP2H. TENSION ARM TENSION POLE A 3-1.
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3-2. Check and Adjustment of the FM Envelope 3-2-1. GUIDE ROLLER Adjustment check 1. 2. 3. 4. Play back an alignment tape (NM6KE2 : 859C339O90). Preset the tracking. Confirm that the FM Waveform is flat such as in (A). Perform the Item 3-2-2. "Height Adjustment of GUIDE ROLLER (SP) " if the leading edge (the DRUM entry side) of the FM Waveform is not flat (Waveform (B) or (C)). Perform the Item 3-2-3.
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3-2-4. Coarse Adjustment of Phase 1. Play back an alignment tape (NM6KE2 : 859C339O90). 2. Preset the tracking. 3. Observe the FM Waveform after performing Item 3-21. "GUIDE ROLLER Check". 4. If the amplitude level of the FM Waveform is low as in (F) in Fig. 3-2-4, set it at the maximum level as in (G), according to the following procedure. Loosen the Screws D and E and insert a screw driver (+) into the Hole in the MAIN PLATE ASSY (Part A).
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3-2-6. Tape Running Condition at the GUIDE ROLLERs (Check 1) GUIDE ROLLER 1. Play back an Alignment Tape. [NM6KE2: 859C339O90] 2. Confirm visually that there is a space between the Tape and the Lower FLANGE of the GUIDE ROLLER (SP) and the GUIDE ROLLER (TU). 3. If there is no space in step 2, replace the TAPE GUIDE ASSY (SP) and TAPE GUIDE ASSY (TU), according to the Item 2-32. "TAPE GUIDE ASSY (SP), TAPE GUIDE ASSY (TU)". 4.
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3-3. A/C HEAD Adjustment 3-3-1. Slant Adjustment of A/C HEAD Screw C A b 1. Play back a blank tape. 2. Slowly turn the slant adjustment Screw C shown in the Fig. 3-3-1 counter-clockwise to slightly crease the bottom of the tape at the Lower FLANGE of the GUIDE POLE (TU). 3. Slowly return the slant adjustment Screw C to remove the crease. 4. Slowly turn the slant adjustment Screw C counterclockwise again and stop just before the tape is creased. Tape Screw A a A' 3-3-2.
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3-4. Phase Adjustment Screw D A b 1. Play back an alignment tape (NM3KE6 : 859C339O50). 2. Preset the tracking. 3. Loosen the Screws D and E shown in the Fig. 3-4-1. Insert a screw driver (+) into the Hole in the MAIN PLATE ASSY (Part A) and move the A/C PLATE to the right and left to set the amplitude level of the FM Waveform to maximum. 4. Tighten the Screws D and E. 5. Play back an alignment tape [NMX : 859C568O60]. 6.
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4. Servicing for Tape Jam during the Loading Process WORM WHEEL 1. Remove the tape if the mechanism part is locked due tangled tape. 2. Rotate the WORM WHEEL of the LOADING MOTOR ASSY shown in the Fig. 4 in the direction of the arrow A to eject the cassette tape. Fig.
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SERVICE CAN BE EXECUTED WITH THE EE PICTURE DISPLAYED 1. Short-circuit the cathode side of D927 and the GND of the DECK ASSY using the jig shown in Fig. 2. 2. Remove the DECK ASSY. 3. Connect TP5X and TP5Y with a jumper Note1: Short-circuit the test points before turning on the power. Note2: Short-circuit the Shield Case and the cathode side of D927 using the jig shown in Fig. 2 before attaching the DECK ASSY. PCB-MAIN (Component side) Jig (Part No. : 859C548O10) Cathode side of D927 3W 330Ω TP5X Fig.
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HOW TO INITIALIZE THE E2PROM A replacement E2PROM is not initialized before shipping, so the E2PROM must be initialized when replaced. Initialize the E2PROM by following the steps below. 1. Press and hold the POWER button on the set for 8 seconds. 2. E2PROM initial setting is completed. WHEN REPLACING IC5A0 When replacing IC5A0, be sure to press the RESET button after turning on the power. ELECTRICAL ADJUSTMENTS Perform only the alignments required.
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[ Servo circuit ] 1. Playback Switching Point Adjustment purpose Video switch over timing during playback. Symptom when incorrectly adjusted Switching noise or jitter in the playback picture. Measuring instrument and condition VCR set up condition ––– Input signal – – – Test point ––– Using tape Alignment Tape ( NS1, stair step ) EXT trigger ––– VCR condition Playback Measurement range ––– Using Jig ––– PCB-MAIN (Component side) TP5A TP5B -2- 1. Play back an Alignment Tape.
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PARTS LIST 1.
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: Critical Component ITEM NO. PARTS NO. PARTS NAME 1 968C049O03 TOP COVER ASSY 2 669D221O40 SCREW 3 572D385O10 F/L SPRING 4 752C673O70 CASSETTE DOOR ASSY 5 701B433O20 FRONT UNIT 6 752C664O40 DOOR PANEL ASSY 7 752C674O60 TIMER PANEL 8 246C324O10 AC POWER CORD DESCRIPTION 4 × 12 46LA005 9 761B366O10 TERMINAL COVER 10 761C645O20 ANTENNA COVER 11 669D500O30 SCREW 3 × 10 12 669D229O90 SCREW M3.
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2.
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: Critical Component ITEM NO. PARTS NO. PARTS NAME DESCRIPTION PACKING PARTS 1 831D190O30 PACKING SHEET 2 803A570O10 CUSHION 3 802B827O30 PACKING CASE 4 ––––––– 800X800 ACCESSORY BOARD ACCESSORY 11 831D337O10 12 872C246O70 13 ––––––– PACKING BAG (FOR ACCESSORY A) INSTRUCTION BOOK BATTERY 14 ––––––– 15 939P724O10 IR BLASTER PACKING BAG (FOR PARTS) 16 243C273O10 CABLE RF 17 243C274O10 Y/C CABLE S-S 1.
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DECK ASSEMBLY
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A 1 B C D E DECK ASSEMBLY DECK ASSEMBLY-1 F G H I N-011 N-013 G-072 A-022 B-025 B-010 G-075 G-201 B-015 G-067 A-025 G-201 G-072 M-037 G-074 G-091 G-201 C-011 C-010 A-026 A-027 2 A-023 H-051 H-012 H-021 M-033 G-071 A-019 M-025 M-033 A-024 3 S-011 T-011 M-022 G-064 G-077 G-080 G-032 G-104 4 G-089 G-047 G-045 G-054 P-012 5 H-031 G-049 M-026 M-021 M-013 G-012 H-011 A-021 G-079 M-012 K G-022 N-012 G-201 J G-024 G-212 P-011 P-021 G-083 M-011 G-048 6 M
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DECK ASSEMBLY-1 DECK ASSEMBLY-1 ∗ Settled Service Parts ∗ Settled Service Parts ITEM PARTS NO. ∗ ADDRESS PARTS NAME DESCRIPTION Qt. ITEM PARTS NO. ∗ ADDRESS PARTS NAME DESCRIPTION Qt. 2.
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A B C D E F G H I DECK ASSEMBLY DECK ASSEMBLY-2 1 G-101 M-031 G-093 M-014 2 G-201 G-088 G-060 G-031 G-212 G-214 G-056 3 G-043 G-018 G-215 G-057 G-025 G-061 4 G-096 G-035 G-081 A-029 G-017 G-211 A-028 G-216 G-066 5 G-019 G-044 G-034 G-094 G-201 6 G-042 7 8 A-2 M-034
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DECK ASSEMBLY-2 ∗ Settled Service Parts ITEM PARTS NO. ∗ ADDRESS A-028 A-029 G-017 G-018 G-019 621C810O10 A-5 622D837O10 A-4 948D089O01 K H-4 948D090O01 K G-3 622D916O10 K B-5 G-025 G-031 G-034 G-035 G-042 948D098O03 622D800O10 622D801O10 622D802O10 621C807O10 K K K K G-043 G-044 G-056 G-057 G-060 621C765O10 621C766O20 640C185O30 640C186O10 640D948O10 G-061 G-066 G-081 G-088 G-093 PARTS NAME DESCRIPTION Qt.
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3. ELECTRICAL PARTS SYMBOL PARTS No. No. PARTS NAME : Critical Components SYMBOL PARTS No. No.
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: Critical Components SYMBOL PARTS No. No. PARTS NAME DESCRIPTION Q922 Q927 260P562O40 TRANSISTOR 260P586O20 TRANSISTOR 2SA952-K 2SB892-T Q928 Q929 Q930 260P559O40 TRANSISTOR 261P036O10 TRANSISTOR 260P559O40 TRANSISTOR 2SC1740S-R,S 2SB1548 2SC1740S-R,S SYMBOL PARTS No. No.
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: Critical Components SYMBOL PARTS No. No. PARTS NAME DESCRIPTION SYMBOL PARTS No. No.
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: Critical Components SYMBOL PARTS No. No. PARTS NAME DESCRIPTION R2061 103P409O50 CHIP RESISTOR 0.1W 0Ω (2125) R2062 R2063 R2064 R2065 R2066 103P409O50 103P409O50 103P409O50 103P409O50 103P409O50 CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR 0.1W 0Ω (2125) 0.1W 0Ω (2125) 0.1W 0Ω (2125) 0.1W 0Ω (2125) 0.1W 0Ω (2125) R2070 R2071 R301 R302 R303 103P409O50 103P409O50 103P405O50 103P403O80 103P470O80 CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR 0.
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: Critical Components SYMBOL PARTS No. No. PARTS NAME DESCRIPTION R6E5 R6E6 R6E7 103P472O90 CHIP RESISTOR 103P472O50 CHIP RESISTOR 103P472O50 CHIP RESISTOR 1/10W 1.5kΩ-F 1/10W 1kΩ-F 1/10W 1kΩ-F R6E8 R6E9 R6F0 R6F1 R6F2 103P472O50 103P471O70 103P473O70 103P472O50 103P472O50 CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR CHIP RESISTOR 1/10W 1kΩ-F 1/10W 470Ω-F 1/10W 3.
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: Critical Components SYMBOL PARTS No. No. PARTS NAME DESCRIPTION C126 C127 C128 141P132O10 CHIP CAPACITOR 141P132O10 CHIP CAPACITOR 154P332O70 CHIP CAPACITOR B50V 0.01µF-K B50V 0.01µF-K CH50V 47pF-J C130 C132 C133 C150 C151 141P130O30 141P132O10 154P332O50 141P132O10 141P132O10 CHIP CAPACITOR CHIP CAPACITOR CHIP CAPACITOR CHIP CAPACITOR CHIP CAPACITOR B50V 330pF-K B50V 0.01µF-K CH50V 39pF-J B50V 0.01µF-K B50V 0.
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: Critical Components SYMBOL PARTS No. No. PARTS NAME DESCRIPTION C358 C379 C3A7 C3A9 C3B0 141P131O70 181P212O60 141P139O30 141P139O70 141P139O70 CHIP CAPACITOR ELECTROLYTIC CAPACITOR CHIP CAPACITOR CHIP CAPACITOR CHIP CAPACITOR B50V 4700pF-K 04W 16V 47µF-M B25V 0.1µF-K B16V 0.22µF-K B16V 0.22µF-K C3B6 C3B8 C3B9 C3C0 C3C8 141P139O30 141P139O30 141P139O30 141P139O30 141P139O30 CHIP CAPACITOR CHIP CAPACITOR CHIP CAPACITOR CHIP CAPACITOR CHIP CAPACITOR B25V 0.1µF-K B25V 0.1µF-K B25V 0.1µF-K B25V 0.
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: Critical Components SYMBOL PARTS No. No. PARTS NAME DESCRIPTION SYMBOL PARTS No. No. PARTS NAME DESCRIPTION C6034 181P219O90 ELECTROLYTIC CAPACITOR 04W 50V 3.3µF-M CF6301 299P116O10 CERAMIC RESONATOR KBR-4.0KES C6035 C6036 C6037 C6040 C6041 181P219O90 141P132O10 141P132O10 181P219O90 181P219O90 ELECTROLYTIC CAPACITOR CHIP CAPACITOR CHIP CAPACITOR ELECTROLYTIC CAPACITOR ELECTROLYTIC CAPACITOR 04W 50V 3.3µF-M B50V 0.01µF-K B50V 0.01µF-K 04W 50V 3.3µF-M 04W 50V 3.
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Luminance Record, Chroma Record HS-U778 44 43 IC6A1 Sub Emphasis 3 CLAMP Q6A4 23 Q6A3 6dB AMP FBC MUTE NC 1 N/S-LPF NL PROCESS 9 6dB AMP IC6A0 Sub Luminance /Sub Chroma 6dB AMP PAL 3L LOGI.COMB AD FBC AGC ATT 7 8 FILTER COMB 10 Q6B0 1H DLY Q2012 Q6C6 1H DLY Y COMB LPF Q6A6 CLAMP 26 NTSC 3L LOGI.COMB FBC MUTE 2 Q6A5 Q2004 Q2006 LPF 21 IC2000 3DYCS/DNR Q2013 NON RELATION DET MUTE ATT 25 ATT 48 1H DLY 12 DA CLAMP 50 39 37 56 33 YC TIM.
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Luminance Playback, Chroma Playback HS-U778 44 IC6A1 Sub Emphasis IC6A0 Sub Luminance/ Sub Chroma NL PROCESS 43 CLAMP ATT IC2000 3DYCS/DNR Q2013 Q2004 Q2006 9 2 7 8 10 NOISE CANCEL LPF 1 FBC FBC FBC 3 Q6B0 MUTE MUTE 6dB AMP 6dB AMP PAL 3L LOGI.COMB AD Q6A3 CLAMP NTSC 3L LOGI.COMB 21 FILTER COMB Q6A4 23 Y COMB Q6A5 Q6C6 N/S-LPF 6dB AMP NON RELATION DET Q2000 Q2001 2 56 54 39 37 AD PS COMB 5 5 DA YC TIM.
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Hi-Fi , Linear Sound and MCS Decoder HS-U778 IC3A0 Modulator/Demod.
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HEATER+ D911 T901 18 BB Power,Timer,Mechanical Control HS-U778 45 V8A0 1,7 Display HEATER- 17 ~ + - +30V 10 D901 14 2 AC 120V D910 ~ CP-MOTOR-V Q908 13 4 D914 D909 PCB-MAIN To TUNER TU01 15 D912 D913 MOTOR-V 16 11 7 Regulator Q901,Q903 D928 Q5A5 Q907 D907 PWV 15 6 D917 D918 Q927 Q928 D920 D960 SW5-1 1 3 Photo-coupler 2 PC901 82 STBY5 59 Q929 Q930 IC901 2 Protect of Power (SW5-1,SW5-2,SW12) 3 7 AMODE IC5A0 µ-COM To IC6A0 14 KEY2 DR-OUT A-ENV To IC2A0
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SCHEMATIC DIAGRAMS NOTE 1. Each voltage should be within ± 20% of the DC voltages measured with a digital voltmeter. 2. The voltages parenthesised on SP recording mode. While those without parenthesised on SP play back mode. 3. Waveforms were taken with standard color bar signal. 4. TP6A, etc. show Test Points. 5.
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T901 F901 HEATER+ C9Y1 D911 BB R925 RV901 HEATER- C920 C901 L901 -30V D912 R923 C922 R902 D910 R922 C927 D913 SELF SUPPORT R901 C918 D901 Q908 C911 C924 C908 D914 C905 C917 C925 G12 R920 R921 R924 CP-MOTOR-V D909 C906 MOTOR-V R903 D902 JP901 D927 R904 C930 SW5-CONT CS12 Q901 C907 Q922 R908 C944 R963 R956 G12 Q919 NR6 Q929 C910 Q903 +30 C941 Q918 R907 C939 STBY5 D961 D960 R973 D943 SW5-2 R967 R969 R906 C946 R955 JP910 CBV Q930 D971 R964 D908 L907
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THR-MUTE BOX-CLK SYSTEM2 REMO-SEND MUTE CBV G12 SW5-2 CS12 REMO-RTN Not Employed +30 MT STBY5 MV SW5-CONT MU NR6 MW CSYNC CK JP152 MR PB-Y ALC-DET REC-C Q153 PB-C JP154 Q157 Y-TO-YCA Q154 R151 Y-FROM-YCA Q150 C163 Q156 S Q155 FSC R152 R150 L150 C160 C156 F-Y-IN C155 C152 MP F-C-IN F-V-IN IC150 BIAS IC151 R134 SSVSYNC PRT R135 S-INPUT C153 C154 L3 C129 SUB-CLK C150 R136 Q124 R132 SUB-DATA C151 L121 L122 R131 L120 R129 Q123 C127 C128 C130 R130
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TP3X AENV R3Y0 TP3Y AFF R3G0 L3A0 C3G0 C3G1 MUTE C3B0 C3F4 I2C-DATA R3F0 R3F6 C3B7 C3B4 C3B3 C3B2 C3B5 C3B6 I2C-CLK C3J6 JP3A3 SW12 D3A2 SW5-2 R3A8 C3B8 TP3AM HF-REC C3B9 C3A9 C3J0 R3A0 R3AM TP3N From 1 pin AMODE C3C9 C3C0 EE C3F5 R3B5 D3A1 R3C1 TU-IN C3F7 D3A0 C3J1 SAP TP3S L3A2 R3C2 Q3A0 C3D2 C3E3 C3E4 R3A3 From 3 pin C3G2 C3G3 R3B9 L3A1 C3J3 C3J4 C3C1 R3A4 R3A2 Q3A2 C3F1 R3L0 C3J2 R3B4 Q3L0 C3L0 C3J7 C3C8 R3B3 C3F2 C3A5 C3F3 C3A4 IC3A0 F-A-IN
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CSYNC Y-FROM-YCA Y-TO-YCA PB-Y PB-C ALC-DET CK FSC 0.48V(p-p)(H) S 0.66V(p-p)(H) REC-C IC2A0 &1 PLAY CK IC2A1 t REC Q2B9 EE IC2A0 %5 PLAY R2F8 C2H6 HSEL L2B0 DFF C2H4 C2H5 R2E5 VENV R2E0 C2H3 0.
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Q5A9 THR-MUTE REMO-RTN REMO-SEND BOX-CLK SYSTEM2 MUTE PRT I2C-CLK I2C-DATA BB RESET VMUTE S-INPUT L3 CGCS SUB-DATA SUB-CLK SSVSYNC TU-IN SAP I2C-DATA I2C-CLK Q5A8 Q5B0 FLDCS SUB-DATA D5B5 R5F7 TP5P0 TP5P1 R5E2 R5F8 Q5B4 SUB-SI JP5A6 TP5P2 SUB-CLK R5G6 D5A0 C5J9 R5B7 R5E7 R5E0 R5D9 TP5LM R5B8 R5B9 C5C2 C5C5 R5G7 R5C0 R5G8 R5E1 Q5B5 R5C4 C5B1 Q5A0 Q5A2 C5B2 C5B3 C5C9 R5R4 Q5A1 D5C0 C5C0 C5C6 R5R5 R5K6 TPDATA TP5F D5A9 TPCLK HSEL EE IC5A1 R5A5
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V8A0 JP8A0 HEATERHEATER+ -30V STBY5 CS-OFF S813 TP5Y C8A2 R8Y0 D813 L8A0 IC8A0 S811 D811 D8GE S812 C8A0 C8A1 D812 TP2T R8A5 R8A2 R8A3 D8G5 R803 C802 R802 D8A8 MS C803 OS TP5X R8A1 J804 TP5T D8A9 R8A4 R8A0 R801 J801 C801 S8A7 D8A7 S8A6 D8A6 S8A5 D8A5 S8A4 D8A4 S8A3 S8A2 D8A3 S8A1 D8A2 D8A1 S8A0 D8A0 FLDCS SUB-CLK SUB-DATA SUB-SI F-Y-IN F-C-IN F-V-IN F-A-IN-R F-A-IN-L JP801 IC8A0 µPD16312GB-3BS COMMAND DECODER D IN D OUT CLK STB DIMMING CIRCUIT 6 1
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J6004 J6006 J6003 J6005 J6014 J6012 J6015 IC6001,IC6002 NJM2520M R6026 R6006 R6004 R6003 R6001 R6025 R6031 R6029 R6032 GND Vout 8 R6056 R6110 V+ NC 6 5 R6002 7 C6303 R6111 TP2J Q6010 C6029 C6028 L6008 C6005 R6010 R6039 R6013 C6117 R6012 R6313 C6157 C6158 R6310 R6311 R6312 BUFFER Q6304 58KΩ R6309 BIAS R6040 R6011 Q6305 Not Employed Q6011 58KΩ C6304 Q6306 R6308 1 2 3 4 Q6009 NC Vin 1 SW1 Vin 2 L6150 Q6002 R6307 Q6302 C6150 C6001 BIAS C6116 C6066
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IC6A0 #7 PLAY IC6A0 #3 REC IC6A0 #3 PLAY 1.7V(p-p)(H) 1.5V(p-p)(H) 0.82V(p-p)(H) 0.72V(p-p)(H) 0.35V(p-p)(H) 0.
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R2057 C2019 R2054 R2048 R2047 R2045 R2043 R2031 L2006 R2055 C2029 R2051 R2049 Q2013 C2018 R2029 C2017 R2061 R2030 PB R2062 YCS-Y R2026 C2012 R2041 R2063 YCS-C C2015 C2041 R2027 C2014 LC2000 R2040 SW5 Q2012 L2005 C2042 R2028 GND R2024 R2039 C2037 L2004 L2000 R2038 R2066 IC2000 FSC R2025 C2013 C2016 C2038 R2037 R2064 YCS-IN L2001 C2028 R2071 R2065 PB-C C2030 R2074 C2048 C2031 C2007 Q2003 R2008 C2032 R2070 R2011 R2007 R2018 R2012 R2019 R2020 R2058 Q
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PCB-SIGNAL [SOLDER SIDE] 1 2 PCB-MAIN F R2019 R2013 C2010 R2023 R2007 C2011 Q2002 R2053 R2055 R2059 R2070 C2049 2 03 C2 E R6F3 R6F4 C6G0 C6G1 Q6C8 R6F2 C6F1 +C2033 C2035 1 1 + R2073 C2037 L2000 C6G5 R6D7 D6A3 R6G3 C6G3 + C2038 1 00 C2 B R6F1 C6F9 L2002 R2072 Q2010 C2006 C2047 R2065 R2066 C2044 C6G2 C6F0 C6E9 R6E9 Q6B8 Q6C9 R6A1 C101 SW 10 SU 4 7 R6F8 Q6C7 C152 C150 1 C151 5 C155 C2F1 R2C0 + 8 4 MT C160 1 C156 B–3 B–3 B–4 B–4 B–3 B–3 B–4 B