Service manual

29
VL-Z1U
10. METHOD OF ADJUSTING THE ELECTRIC CIRCUIT
-Before making adjustment-
· It seems that, in most cases, this adjusting method is used when it becomes necessary to adjust the electric circuit as a result of
replacement of worn mechanism parts or the video head. When adjusting the electric circuit, check that the mechanism operates
properly (the mechanism is adjusted completely). If a failure occurs in the electric circuit, be sure to locate the fault using a
measuring instrument and then perform repairing, replacement and adjustment, as described in this adjusting method.
Avoid performing undue adjustments etc. without using proper measuring instruments.
· The electric circuit components in the circuit board unit of this product are densely-packed into packages. Most of them are surface-
mounted for downsizing.
When replacing components in servicing the product, perform replacement work swiftly with a soldering iron.
In general, surface-mounted components are inferior in heat resistance to large-sized discrete components used in TV sets,
stationary decks, etc. Heating the electrode of a surface-mounted component with a soldering iron for a long time needlessly will
therefore lead to a failure. Take great care not to do so.
Take special care in this respect when replacing chip multilayer capacitors in particular.
We recommend you to use a ceramic soldering iron (Tip temperature: 250°C, Contact time: 5 seconds or less).
10-1. Adjustment of liquid crystal video section
List of measuring jigs
VL-Z1U Specifications of service jigs
· Color monitor TV
· Digital voltmeter
· DC power source
· Audio generator
(CR oscillator)
· Frequency counter
· AC adapter
· Stereo AV output cable (supplied)
· Adjustment remote control
(RRMCG0033TASA)
· Signal generator
(NTSC pattern generator LCG-401/
401YC: Manufactured by Leader)
· Oscilloscope
· Vector scope
· Tape for recording
· DC cable (supplied with AC adapter)
· Extension wire of video section
· Alignment tape
90ADDVC-TAPE (color bar)
· Error rate adjustment tape (reference tape)
RTPEVA001WJZZ
No. Connection section Connector REF. No. No. of pins
New/
Parts cord
Price
Cont.
code
1 H/A PWB — MAIN PWB1 SC307—SC3302 33P N QPWBHB737WJZZ AN
2 H/A PWB — MAIN PWB2 SC308—SC3301 33P N QPWBHB737WJZZ AN
4 MAIN — LITHIUM PWB SC8800—SC5800 27P-25P QPWBHB742WJZZ Product FPC used AE
5 MAIN — RUNTA005WJZZ SC1201 80P C QCNW-1373TAZZ BQ
6 RUNTA005WJZZ — SUB P2901 80P N RUNTZA005WJZZ AX
8 Menu key — SUB SC2002—SC501 9P-15P QPWBHB772WJZZ Product FPC used AE
9 H/A PWB — MAIN PWB P301—P3301 5P QCNW-B171WJZZ Product wire used AF
10 TP jig for envelope checking P3303 30B-B N RUNTZA004WJZZ AW
11 Power supply SC310—SC2101 12P QCNW-B167WJZZ Product FFC used AC
12 ZOOM SC311—SC2201 10P C QPWBHB746WJZZ AE
13 CCD PWB — MAIN SC1001—SC1202 33P QPWBHB738WJZZ Product FPC used AD
14 Lens unit — SUB SC551 25P CLNS-A005RMA5 Product unit used BQ
15 MIC — SUB P3602 4P RMiCC0108TAZZ Product unit used AP
17 MECHA TURN — MAIN P1201 2P DUNTKB732PM00 Product unit used AG
19 SPEAKER — ZOOM P2201 2P VSP0020P-B2WN Product unit used AK
20 LCD UNIT — MAIN SC1800/SC1801 18Px2 QPWBHB736WJZZ Product FPC used AR