DA100 (50Hz) and DA50W Chassis – Repair Notes DA100 (50Hz) and DA50W Chassis Repair Notes Revision 3 – May 2003 Alan van Winkelen Page 1 of 80 Sharp Electronics (UK) Limited - May 2003 Revision 3
DA100 (50Hz) and DA50W Chassis – Repair Notes Contents Contents ..........................................................................................2 Figures............................................................................................5 Introduction ......................................................................................7 Product Specifications...........................................................................8 IC Identification.....................................
DA100 (50Hz) and DA50W Chassis – Repair Notes Faults in the East/West Circuit................................................................................. 35 CRT PWB ....................................................................................... 36 Faults on the CRT PWB.......................................................................................... 36 Class D Output Stages ........................................................................ 37 Pins 8 and 9 – Frequency ..........
DA100 (50Hz) and DA50W Chassis – Repair Notes Analogue to Digital Converters .................................................................................. 57 Digitally Controlled Clock Oscillator ............................................................................ 57 Analogue Video Output........................................................................................... 57 Average Beam Current Limiting .................................................................................
DA100 (50Hz) and DA50W Chassis – Repair Notes Figures Figure 1: DA100 (50Hz) Chassis – model 56FW53H ................................................................................................................. 7 Figure 2: Power Supply Layout (Component Side).................................................................................................................... 13 Figure 3: Power Supply Component Locations (Print Side) ........................................................................
DA100 (50Hz) and DA50W Chassis – Repair Notes Figure 43: Centre Speaker PWB Location ................................................................................................................................44 Figure 44: Centre Speaker Circuit Diagram..............................................................................................................................44 Figure 45: Centre Speaker Modification 1 ....................................................................................
DA100 (50Hz) and DA50W Chassis – Repair Notes Introduction The DA100 (50Hz) chassis and its derivatives (DA50W) are fitted in many Sharp widescreen television sets. Production started in 1999 with the FW models and continued up to the HW models. There have been a number of changes to the circuit configuration, layout and operation but the overall circuit theory and fault finding techniques remain the same for all chassis.
DA100 (50Hz) and DA50W Chassis – Repair Notes Product Specifications The basic chassis comes with NICAM and fast text as standard and can drive CRT’s from 56 to 76cm in both 4:3 and 16:9 formats. The only 4:3 sets that use this chassis are the 59ESD7H and 66ESD7H, both of which are Dolby Pro-Logic models. All variants of this chassis are fitted with three SCART sockets on the rear of the board – composite video, SVideo and RGB can be fed into these sockets.
DA100 (50Hz) and DA50W Chassis – Repair Notes IC Identification Several different types of IC are used in the DA100 (50Hz) chassis. These are listed in the table below. Note that although these IC’s may be available from other sources, it is strongly recommended to obtain these directly from Sharp Electronics (UK) Limited, or their approved distributors, using the part numbers given below. There can be compatibility issues when incorrect IC’s are fitted - even if they have the correct type number.
DA100 (50Hz) and DA50W Chassis – Repair Notes Note 1 – EPROM Types and Versions FW Models EPROM types and versions vary between CRT and Teletext IC types. Refer to the list below for more information. The EPROM version is normally written on a paper label stuck to the top of the device.
DA100 (50Hz) and DA50W Chassis – Repair Notes GF Models The table below details the different part numbers for IC1002. Note that this IC can either be an EPROM or a MTP. An EPROM has a small window in its top to enable the IC to be erased by ultra-violet light. A MTP does not have this window and normally works at 3.3V.
DA100 (50Hz) and DA50W Chassis – Repair Notes Dolby Pro Logic PWB The Dolby Pro-Logic PWB has the following IC list. Note that some of the reference numbers are the same as the IC’s fitted on the centre speaker PWB.
DA100 (50Hz) and DA50W Chassis – Repair Notes Power Supply This power supply has been used in many Sharp television receivers during the past six years and is reliable. It works by changing both the pulse width and frequency of operation, this enables correct regulation of the secondary supplies. The major difference between the models is the amount of current that the power supply can provide; this is reflected in the wattage consumed from the AC supply.
DA100 (50Hz) and DA50W Chassis – Repair Notes Power Supply Lines Supply Typical Voltage Range Nominal Resistance Voltage/Resistance Measurement Point +150V 145V to 155V >10kΩ D720 +18V 15V to 20V >10kΩ D718 -18V -15V to –20V >900Ω D719 +10V 7V to 10V >10kΩ D722 +5V 5.0V to 5.
DA100 (50Hz) and DA50W Chassis – Repair Notes Circuit Operation Depending on the input mains circuit, there is either 320VDC (conventional bridge rectifier/capacitor arrangement) or 360VDC (power factor circuit) fed into the top of the chopper transformer. This voltage is also used to charge C714 via R713 and R714, allowing the voltage on the gate of Q701 to increase. When the voltage on the gate of Q701 reaches 4.5V, it turns on and current flows in the primary winding of T701.
DA100 (50Hz) and DA50W Chassis – Repair Notes removed, the current flowing from source to drain will decrease, the volt drop across R716 will decrease and Q702 will turn off, allowing the gate to rise again. If the over current condition continues, the power supply will trip. Q702 is also turned on by pin 15 of IC702 during standby to turn the power supply off. On Dolby Pro-Logic models this signal controls the operation of the Dolby Pro-Logic power supply.
DA100 (50Hz) and DA50W Chassis – Repair Notes Standby Power Supply This part of the circuit has changed compared to previous chassis where this supply was derived by means of a bridge rectifier with two additional 68k resistors and a 5.1V zener diode to limit the voltage. This has been replaced by a series regulator circuit, which is supplied from one side of the mains, with an earth return via the bridge rectifier. One of the main reasons for this circuit is power consumption.
DA100 (50Hz) and DA50W Chassis – Repair Notes Degauss Circuit This circuit is configured to ensure that the degauss circuit will not operate unless the switch mode power supply is running and pin 14 of IC702 is low. A positive bias is applied to the emitter of Q714 from T701 pin 15 (rectified by D727 and limited by R762, R768 and D728) via the optical diac; IC708.
DA100 (50Hz) and DA50W Chassis – Repair Notes +5V Supply Generation This DC-DC converter will operate from a supply between 8V to 55V and produces an output voltage of between 3.3V and 50V depending on the value of R747. For an output of 5V, R747 must be 2k7Ω. C741 connected to pin 3 provides a soft-start routine. If pin 3 is held low then the device will not operate. The frequency of the internal oscillator is fixed by the value of R706 and C735.
DA100 (50Hz) and DA50W Chassis – Repair Notes Overriding the Power Supply Control It is possible to ascertain if the power supply is working by removing the standby control voltage from the base of Q702. If R792 is disconnected, the power supply should start if there are no other problems with it or the supply lines. It is good practice to disconnect R623 when undertaking this exercise, as this will ensure that the horizontal output stage does not become active.
DA100 (50Hz) and DA50W Chassis – Repair Notes Power Factor Correction Circuit To ensure good linearity of the mains supply voltage waveform, it is necessary to ensure that current is taken at the start of the voltage cycle, i.e. zero voltage switching. This function is achieved with the use of a Power Factor Correction Circuit.
DA100 (50Hz) and DA50W Chassis – Repair Notes Figure 14: Power Factor Correction PWB – 66 and 76cm Models (PWB on left) Note that on the 56FW53H the Power Factor PWB is mounted at the front of the set, underneath the CRT.
DA100 (50Hz) and DA50W Chassis – Repair Notes Faults in the Power Supply High HT In some cases the HT can rise to over 200V, this can cause damage to other parts of the circuitry. This is normally caused by failure of IC705 - the power supply voltage regulation feedback opto coupler. The device is easily damaged by excessive heat while soldering, so remember to keep your soldering iron turned down to 250oC or below, and not to solder for more than 10 seconds on each leg.
DA100 (50Hz) and DA50W Chassis – Repair Notes Figure 19: Location of Centre Speaker PWB Figure 20: Location of Components on the CRT PWB When the avalanche diode is fitted, only four components generally need to be replaced (D735, Q601, IC705 and C720), this is because it prevents further damage to the circuitry should the power supply be kept running.
DA100 (50Hz) and DA50W Chassis – Repair Notes No Operation No operation can be caused by a number of components, the most common being around the primary control IC, IC702. If the supply on pin one of this IC falls below 5V, the operation of the power supply becomes unreliable. As can be seen from the previous circuit description, the supply circuit is fairly complex, however only a few components cause problems. For low supply voltage to IC702 check that R770 (270Ω safety) and R771 (470kΩ) are OK.
DA100 (50Hz) and DA50W Chassis – Repair Notes Reference Description Part Number D701/2/3/4 Diode, RF2005 RH-DX0555BMZZ D729 Zener Diode, TZMC47 RH-EX0568BMZZ IC702 IC, ST6203B RH-IX1646BMZZ IC703/4/5 IC, MOC8106SR2V-M RH-IX0106BMZZ IC706 IC, KA431AZ RH-IX1674BMZZ IC707 ICL4978 RH-IX1704BMZZ Q701 Transistor, S5F10N80A RH-TX0198BMZZ Q702 Transistor, 2PD602AR RH-TX0182BMZZ Q703 Transistor, 2SD2391Q RH-TX0151BMZZ Q710 Transistor, 2SC2412 VS2SC2412KQ-1 Q711 Transistor BC547 RH
DA100 (50Hz) and DA50W Chassis – Repair Notes Horizontal Stage As in previous Sharp chassis a transformer-less driver circuit has been used, with the driver stage obtaining its running voltage from the fly-back transformer, T601. At switch on +8V from the power supply is applied to Q603 collector via R605 and Q602 collector via R628 and R608. At the same time –16V is applied to Q602 emitter via R619.
DA100 (50Hz) and DA50W Chassis – Repair Notes From the primary winding (pin 7) the HT is stepped up and rectified by D621 to produce the supply required by the CRT drive circuit. Finally a negative going voltage is fed from pin 8 to the protection circuit. This voltage represents the beam current. The greater the beam current (raster going brighter) the greater this voltage would be in a negative direction. This negative voltage is then fed to the IC1001 pin 95 via D622 and Q606.
DA100 (50Hz) and DA50W Chassis – Repair Notes Focus Modulation (66cm and 76cm models only) Due to their larger screen size's, the 66cm and 76cm models employ a focus modulating circuit. This is driven by the line output signal. The function of the focus modulator is to ensure that the outer extremes of the CRT face are kept in focus. As the beam travels to the edges of the shadow mask, it will become distorted due to the increased distance travelled when compared with the centre.
DA100 (50Hz) and DA50W Chassis – Repair Notes Figure 27: FW Focus Modulator Circuit The FW focus modulator circuit is slightly different to the GF circuit due to the type of screen being used. As it is not a pure flat screen, the curvature of the screen effects the time that the electron beam takes to reach the screen by a greater amount than with a flat screen. This effects the focus in both the horizontal and vertical directions.
DA100 (50Hz) and DA50W Chassis – Repair Notes Faults in the Horizontal Stage Horizontal Output Transistor Failure If the negative supply used to turn off the horizontal output transistor is too low, then it will not turn off fully. This will result in a large voltage across the collector/emitter junction and current being drawn at the same time. The power generated will have to be dissipated by the transistor itself and therefore it will get very hot. Eventually it will fail.
DA100 (50Hz) and DA50W Chassis – Repair Notes East/West Circuit In addition to the normal function of an east/west correction circuit used with 4:3, 110° CRT, a wide screen television correction has to be changed for the different types of scanning modes. Wide screen television generally has three scanning modes, 4:3, 14:9 and 16:9, additionally the 16:9 scanning modes has three variants, Full, Panorama and Cinema.
DA100 (50Hz) and DA50W Chassis – Repair Notes Figure 30: East/West Circuit – Print Side Figure 31: East/West Circuit - Component Side Page 33 of 80 Sharp Electronics (UK) Limited - May 2003 Revision 3
DA100 (50Hz) and DA50W Chassis – Repair Notes Figure 32: East/West Drive Waveform - Pin 32 of IC801 It can be seen in the waveform that there are 'noise spikes' throughout the display. This is due to the oscilloscope being used to record this picture. An analogue oscilloscope will display a smoother curve.
DA100 (50Hz) and DA50W Chassis – Repair Notes Faults in the East/West Circuit When fault finding in the east/west circuit, it is important to ascertain in which part of the circuit the fault lies. Check the control output of IC801 – pin 32. There should be a parabola waveform on this pin at a base frequency of 50Hz. It will change wave shape depending upon the amount of correction applied, so it is important to enter the service mode and ensure that none of the adjustments are at minimum or maximum.
DA100 (50Hz) and DA50W Chassis – Repair Notes CRT PWB There are two types of CRT PWB fitted to this chassis. One is for use with the 66cm and 76cm versions of this chassis and the other is for the 56FW53H only. The major difference is that the 56cm model does not have a scan velocity modulator or picture rotation circuits on this PWB. This means that it is physically smaller than the other models. Note that the CDA IC, IC1801, can be one of three types – see note in IC Identification section.
DA100 (50Hz) and DA50W Chassis – Repair Notes Class D Output Stages Sharp have used class D output stages for a number of years in discrete component form, but now these are incorporated into specially designed integrated circuit. These devices are ideal for use with television audio and vertical output stages where high efficiency (low energy use) is required. A TDA7480 is used for audio and vertical outputs and the TDA7481 to drive the sub-woofer in the Dolby Pro-Logic versions of the chassis.
DA100 (50Hz) and DA50W Chassis – Repair Notes Vertical Stage Circuit Operation The operation of the vertical output circuit is similar to the audio with the exception that there is no mute circuit, although C511 will stop the circuit from operating until the +13V supply, is present. Figure 35: Vertical Output Amplifier The PWM signal from pin 4 of the IC, is passed through a low pass filter (L352 and C504) producing a ramp signal at the field deflection coils.
DA100 (50Hz) and DA50W Chassis – Repair Notes Q503 turning off due to the removal of its gate bias. Q502 turns on because of D507 conducting and pulling its base voltage lower than its emitter. Figure 36: Vertical Fly-back Circuit From the junction of Q502 collector and the scan coils the vertical fly-back pulse is applied to IC801 pin 11 (Vprot Signal). This is an indication that the vertical output stage is operational.
DA100 (50Hz) and DA50W Chassis – Repair Notes Figure 38: Vertical Scan Coil Waveform - Top of Coil Figure 39: Vertical Scan Coil Waveform - Bottom of Coil Page 40 of 80 Sharp Electronics (UK) Limited - May 2003 Revision 3
DA100 (50Hz) and DA50W Chassis – Repair Notes Figure 40: Vertical Stage - Component Side Figure 41: Vertical Stage - Print Side Page 41 of 80 Sharp Electronics (UK) Limited - May 2003 Revision 3
DA100 (50Hz) and DA50W Chassis – Repair Notes Faults in the Vertical Stage Most vertical faults can be traced to either software corruption or output IC failure. If the NVM corrupts, then it can cause severe vertical distortion, no drive or fold-over at the top of the screen. An NVM problem can be eliminated by blanking it first by using the blanking OTP (see the NVM blanking section of this article).
DA100 (50Hz) and DA50W Chassis – Repair Notes Audio On Board Circuit Operation At switch on C362 is discharged holding IC301, pin 12 low preventing any output until supply has been established. Once supply has been established and pin 12 is greater than 2.7V the IC will start to oscillate, producing a PWM signal with a frequency and a mark space ratio which is dependant on the input signal at pin 11.
DA100 (50Hz) and DA50W Chassis – Repair Notes Centre Speaker PWB On all sets except the 56FW53H, a centre speaker amplifier PWB is added to the chassis. This centre speaker PWB has gone through a number of revisions. Not all PWB's are compatible, so be sure to use the correct circuit diagram when servicing. Figure 43: Centre Speaker PWB Location Figure 44: Centre Speaker Circuit Diagram Note that on the 66GF64H and 76GF64H, there is a speaker located in the rear cabinet. This is the centre speaker.
DA100 (50Hz) and DA50W Chassis – Repair Notes Faults in the Audio Circuit Faults in the audio stage are normally caused by high HT (see power supply section for more details on this fault scenario). When the HT become excessive, it is possible for one or all of the audio output IC’s to fail. Usually, the feed coils L350 and L351 (for IC301) and L315 and L316 (for IC302) will go open circuit as the IC draws excessive current. The part number for these coils is VP-CD3R3K0000.
DA100 (50Hz) and DA50W Chassis – Repair Notes Figure 46: Centre Speaker PWB Modification 2 Page 46 of 80 Sharp Electronics (UK) Limited - May 2003 Revision 3
DA100 (50Hz) Chassis – Article for Television Magazine Dolby Pro-Logic Circuit Operation Dolby Pro-Logic functions are provided by a separate PWB on the models ending with the number 4, i.e. 66GF64H. This panel contains all the power supply, processing IC’s and output devices required for the Dolby Pro-Logic function. The PWB is virtually identical between models, except that the GF models route the sub-woofer output onto the main PWB as it exits the DPL processor (IC1301).
DA100 (50Hz) Chassis – Article for Television Magazine Figure 48: Dolby Pro-Logic Circuit Diagram (66GF64H) Page 48 of 80 Sharp Electronics (UK) Limited - March 2003 Revision 2
DA100 (50Hz) Chassis – Article for Television Magazine Faults in the Dolby Pro-Logic Circuit In the case of an incorrectly operating or dead set, the Dolby Pro-Logic PWB can be ruled out by disconnecting it from the main PWB. This is easily achieved by disconnecting the large multi-way cable from the main PWB. The set should start up normally, but there will be no sound if the television has been set to external speakers.
DA100 (50Hz) Chassis – Article for Television Magazine Control and Communication As with all current Sharp television chassis, the microprocessor (CPU) is responsible for the control of the set, communicating with all other areas of the chassis via various data buses. Similar to other chassis the CPU does not operate during standby. As there needs to be some form of control on the primary side of the power supply, a slave processor is used.
DA100 (50Hz) Chassis – Article for Television Magazine Slave There are two data lines that communicate with the slave processor located on the primary side of the power supply. As this has to be isolated, communication is via two opto-couplers. IC703 is used to send information to IC702 and opto-coupler IC704 is used for the return path. Reset In Main system reset. This will operate each time the main switch mode powers supply starts. Reset is a state change from low to high generated by IC1005.
DA100 (50Hz) Chassis – Article for Television Magazine Protection - Microprocessor Audio Output The outputs from all of the audio output stages are fed to the base of Q303 and Q304. C377 and R361 form an averaging circuit. As the output voltage fed to the speakers should have an average DC of 0V over a period of time, the DC voltage at the base of these transistors should be zero.
DA100 (50Hz) Chassis – Article for Television Magazine AV Link This television chassis has the capability of directly controlling a VCR via the SCART socket or the VCR controlling the television. In either chase the VCR must be compatible with the ‘AV Link’ system, also during the installation of the television and VCR it will be necessary to decide whether it is the television or VCR which has overall control.
DA100 (50Hz) Chassis – Article for Television Magazine EPROM’s and NVM’s To enable the microprocessor to control its various external devices correctly, it needs a program to run its internal operations. This program is stored in an external storage device that is normally referred to as the EPROM, but this is not totally correct for all models. There are three types of storage devices fitted to Sharp television receivers. These are EPROM’s, OTP’s and MTP’s.
DA100 (50Hz) Chassis – Article for Television Magazine Note that the HW blanking jig works at the lower supply voltage of 3.3V. Although it will not be damaged when fitted to a set with a 5V supply, the NVM will not be blanked if it is used. The reverse is also the case – FW jig used with a 3.3V supply. Using the jig is simple, just follow the instructions below: 1. Turn the television off at the mains 2. Remove IC1002 3. Replace IC1002 with the correct blanking jig 4.
DA100 (50Hz) Chassis – Article for Television Magazine Video and Synchronisation Processor This IC is a member of the ‘Micronas’ VDP 31xxB IC family. These are high-quality video processors that allow the economic integration of features in all classes of TV sets. The VDP 31xxB family is based on functional blocks contained in the two previous chips form Micronas – the VPC3200A Video Processor and DDP3300A Display and Deflection Processor.
DA100 (50Hz) Chassis – Article for Television Magazine Input Selector Up to five analogue inputs can be connected. Four inputs are for composite video or S-VHS luminance signal. These inputs are clamped to the sync back porch and are amplified by a variable gain amplifier. One of these inputs is for connection of S-VHS chrominance signal (it is internally biased and has a fixed gain amplifier). Clamping The composite video input signals are AC coupled to the IC.
DA100 (50Hz) Chassis – Article for Television Magazine are blanked. This feature can be selected by software. The safety input pin has two thresholds. Between zero and the lower threshold, normal functioning takes place. Between the lower and the higher threshold, the RGB signals are blanked. Above the higher threshold, the RGB signals are blanked and the horizontal drive is shut off. Both thresholds have a small amount of hysteresis.
DA100 (50Hz) Chassis – Article for Television Magazine Faults Connected to the VDP In later versions of this chassis a slightly different version of VDP was fitted. The type number (VDP3120) is the same, but the revision number is different. If patterning is experienced after changing IC801 (VDP3120 only), remove C824 if fitted. This capacitor is fitted from pin 33 of IC801 to ground. Figure 57: Position of C824 Note that poor dressing of the cables can also cause patterning.
DA100 (50Hz) Chassis – Article for Television Magazine Picture Rotation Due to the width of a 16:9 CRT the horizontal tilt of the picture can be influence by external magnetic fields. To overcome this problem, an extra coil is fitted around the CRT, which is connected to a DC amplifier, controlled by the microprocessor. Figure 58: Picture Rotation Circuit (located on CRT PWB) Circuit Description The microprocessor (IC1001) will output a PWM signal from pin 55.
DA100 (50Hz) Chassis – Article for Television Magazine Scan Velocity Modulator The purpose of this circuit is to maintain the luminance level as the electron spot moves across the CRT face. The distance that the electron beam travels from the electron gun to the CRT face at the outer edges of the CRT is greater than the distance from the electron gun to the centre of the CRT face.
DA100 (50Hz) Chassis – Article for Television Magazine Faults in the Picture Rotation and Scan Velocity Modulator Circuit One of the most common problems in this area occurs after a receiver has been serviced. The plugs for the scan velocity modulator and the rotation coils are the same, and it is easy to mix the two up. If no adjustments are made to either of these circuits, then there may not be any noticeable change to the picture.
DA100 (50Hz) Chassis – Article for Television Magazine Preventative Maintenance Ensure that: 1. The 170V avalanche diode is fitted across C720. 2. C604 is rated at 105C. 3. R713 and R714 are metal film types. 4. R1721 and R1722 (Pro-Logic power supply) are metal film types. 5. On the 66FW53/4H and 76FW53/4H that the two extra capacitors are fitted to the CRT base, as shown in the diagram below. 6. There are no dry joints in the horizontal output circuitry, especially on C613 and R613. 7.
DA100 (50Hz) Chassis – Article for Television Magazine Servicing Tips When servicing this chassis, it is advisable to remove it from the plastic support frame, by taking out the eight or ten fixing screws. This only takes about a minute and can save many more when searching for a component located underneath one of the bracing bars! It is not acceptable to remove any of this support frame as this may result in the chassis cracking.
DA100 (50Hz) Chassis – Article for Television Magazine Chart 1 - No 140v rail Before switching on ensure that the aerial is not connected CTV not faulty Neon illuminated Standby mode Power Supply Starts Plug or internal fuse has failed No Check Bridge Rectifier,Q701, Q702, Q703 and D712 Yes Power Supply Starts For A Few Seconds Only No Press CH+ button on main PWB NICAM or OPC LED's illuminated Power Supply is working correctly Yes Check data communication (see LED's Fault code table) No Chan
DA100 (50Hz) Chassis – Article for Television Magazine Chart 2 - 140v rail Present Before switching on ensure that the aerial is disconnected Line Drive Fault Less Than1.8v Check Q607 (crow bar) and IC801 Power supply is working correctly EHT Protection circuit operating More Than 1.
DA100 (50Hz) Chassis – Article for Television Magazine Error Codes Each chassis has a method of flashing the LED’s on the front of the set to indicate whether various devices connected to the I2C bus are operational. These codes are shown in the table below.
DA100 (50Hz) Chassis – Article for Television Magazine Part Changes There have been a number of parts changes to this chassis during its four-year life span. This can be frustrating when referring to the service manual parts listing and the parts do not tie up. Normally the changes revolve around CRT types, fitting of the Power Factor Module and introduction of the double copper chassis.
DA100 (50Hz) Chassis – Article for Television Magazine Service Mode All adjustments to this chassis, except for focus, are carried out in the service mode. The service mode is provided to enable the engineer to correctly set up the receiver to the CRT fitted in the set. Note that these adjustments may vary from one receiver to another. Entering the Service Mode To enter the service mode, carry out the following procedure: 1. Connect a test pattern to the antenna terminal. 2.
DA100 (50Hz) Chassis – Article for Television Magazine Geometry Adjustments All geometry adjustments are based on an internally generated test pattern as shown below. When carrying out any of the above geometry adjustments, use the internally generated test pattern for guidance. G2 Setting Follow the procedure below to set the G2 and Grey scale: 1. Tune the set to the output of a RF signal generator. 2. In the user menu, set the picture levels to the FACTORY settings. 3.
DA100 (50Hz) Chassis – Article for Television Magazine Grey Scale Adjustment 1. Using a grey scale pattern set the Red Cut-off value to 32 and the Red Gain value to 50. 2. Leave the Red Cut Off and Gain as above and adjust Green and Blue Cut-off and Gain to achieve correct grey scale tracking. As with all grey scale adjustments it will be necessary to re-adjust the settings to achieve good tracking.
DA100 (50Hz) Chassis – Article for Television Magazine Voltage Tables These tables are for guidance only Page 72 of 80 Sharp Electronics (UK) Limited - March 2003 Revision 2
DA100 (50Hz) Chassis – Article for Television Magazine IC1001 – Microprocessor Type: Thomson ST10R272L Sharp Part Number: RH-IX1686BMZZ Package: SMD gull wing Price Code: AW This IC is the same type for all models (FW, GF and HW). To date, it has no alternative. Pin DC Voltage 56 RES2OUT O Reset output 2 1 P5.13 Name I/O I Vertical Sync Comment 0V 57 HOUT O Horizontal mute control 3.3V 2 P5.14 I AFT 1 0V 58 POH 7 I Control - 3 P5.
DA100 (50Hz) Chassis – Article for Television Magazine IC801 – Video Sync Processor (VDP) Type: Micronas VDP 3120C2 Sharp Part Number: RH-IX1688BMN2 Package: DIL Price Code: BH This IC is the same type for all FW models. GF and HW models can be fitted with the VDP 3130 (part number RH-IX1858BMZZ). The voltage for this IC are similar. Comment DC Voltage 43 44 FBLIN I Earth 0V 45 RIN2 I Reset (RES1) 5.0V 46 GIN2 I Clock 4.6V 47 BIN2 I From RGB SCART 0V I/O Data 3.
DA100 (50Hz) Chassis – Article for Television Magazine IC305 – Multiple Sound Processor (MSP) Type: ITT MSP3410D PSD1P64 Sharp Part Number: RH-IX1636BMZZ Package: DIL Price Code: BD This IC is the same type for all FW models. To date, it has no alternative.
DA100 (50Hz) Chassis – Article for Television Magazine IC1801 – Cathode Drive Amplifier (CDA) Type: TEA5101A Sharp Part Number: RH-IX1416BMZZ Package: QIL Price Code: Type: STV5109 Sharp Part Number: RH-IX1803BMZZ Package: QIL Price Code: Type: TDA6019JF Sharp Part Number: RH-IX1833BMZZ Package: QIL Price Code: AN AS AR TDA6109 TEA5101 Pin Name I/O DC Voltage Pin Name 1 B input I 3.18V 1 B input I/O I 3.18V DC Voltage 2 Reference I 11.4V 2 Reference I 11.
DA100 (50Hz) Chassis – Article for Television Magazine IC301 / IC302 - Audio Amplifiers Type: Thomson TDA7480 Sharp Part Number: VHITDA7480/-1 Package: DIL Price Code: AK This IC is the same type for all FW models. To date, it has no alternative. Comment DC Voltage 11 Input I Signal input 0V 1 -Ve I Negative supply -18.0V 12 Mute I <2.7V mute 5.1V 2 -Ve I Negative supply -18.0V 13 NC X Not connected 0.5V Pin Name I/O 3 -Ve I Negative supply -18.
DA100 (50Hz) Chassis – Article for Television Magazine IC501 - Vertical Output Type: Thomson TDA7480 Sharp Part Number: VHITDA7480/-1 Package: DIL Price Code: AK This IC is the same type for all FW models. To date, it has no alternative. Comment DC Voltage 11 Input I Signal input 1 -Ve I Negative supply -13.1V 12 Mute I <2.7V mute 5.0V 2 -Ve I Negative supply -13.1V 13 NC X Not connected 0V Pin Name I/O 0V 3 -Ve I Negative supply -13.
DA100 (50Hz) Chassis – Article for Television Magazine IC2401 - Megatext **FW53H Type: Siemens SDA5273-2 Sharp Part Number: RH-IX1673BMZZ Package: DIL Price Code: BE **FW54H (Pro-Logic Models) Type: Siemens SDA5275-3 Sharp Part Number: RH-IX1709BMZZ Package: DIL Price Code: BG Note that a different type of IC is used for the Dolby Pro-Logic version of this chassis. It also has a page store (IC2402) associated with the Mega Text IC when used in the Pro-Logic set.
DA100 (50Hz) Chassis – Article for Television Magazine IC201 - IF Type: Temic TDA4472 MFL Sharp Part Number: RH-IX1672BMZZ Package: DIL Price Code: AP This IC is the same type for all models. To date, it has no alternative. Pin Name I/O Comment DC Voltage 16 GND X Earth 0V 1 SIF I Sound IF 3.2V 17 C I PLL control 4.25V 2 SIF I Sound IF 3.14V 18 PLL I PLL control 2.2V 3 IS X Not connected 3.4V 19 AFC X Not connected 3.
