Method Of Adjusting The Electric Circuit - Sharp VL-Z7E-A Service Manual

9. 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).
9-1. Adjustment of liquid crystal video section
List of measuring jigs
· Color monitor TV
· Digital voltmeter
· DC power source
· Audio generator
(CR oscillator)
· Frequency counter
· AC adapter
VL-Z7S/E/Z7E-A/Z7E-W/Z8H Specifications of service jigs
No. Connection section
1 H/A PWB — MAIN PWB1 SC307—SC3302
2 H/A PWB — MAIN PWB2 SC308—SC3301
4 MAIN — LITHIUM PWB
5 MAIN — RUNTA005WJZZ
6 RUNTA005WJZZ — SUB
7 Hot shoe — SUB
8 Menu key — SUB
9 H/A PWB — MAIN PWB
10 TP jig for envelope checking
11 Power supply
12 ZOOM
13 CCD PWB — MAIN
14 Lens unit — SUB
15 MIC — SUB
16 FLASH — MAIN
17 MECHA TURN — MAIN
19 SPEAKER — ZOOM
20 LCD UNIT — MAIN
· Stereo AV output cable (supplied)
· Adjustment remote control
(RRMCG0033TASA)
· Signal generator
(NTSC pattern generator LCG-401/
401YC: Manufactured by Leader)
· Oscilloscope
Connector REF. No. No. of pins
33P
33P
SC8800—SC5800 27P-25P
SC1201 80P
P2901 80P
—SC501 15P
SC2002—SC501 9P-15P
P301—P3301 5P
P3303 30B-B
SC310—SC2101 12P
SC311—SC2201 10P
SC1001—SC1202 33P
SC551 25P
P3602 4P
—SC1204 12P
P1201 2P
P2201 2P
SC1800/SC1801 18Px2
· Vector scope
· Tape for recording
· DC cable (supplied with AC adapter)
· Extension wire of video section
· Alignment tape
· Error rate adjustment tape (reference tape)
New/
Cont.
N QCNW-B315WJZZ
N QCNW-B315WJZZ
QPWBHB742WJZZ Product FPC used
C QCNW-1373TAZZ
N RUNTZA005WJZZ
QPWBHB739WJZZ Product FPC used
QPWBHB739WJZZ Product FPC used
QCNW-B171WJZZ Product wire used
N RUNTZA004WJZZ
QCNW-B167WJZZ Product FFC used
C QCNW-1769TAZZ
QPWBHB738WJZZ Product FPC used
CLNS-A005RMA5 Product unit used
RMiCC0108TAZZ Product unit used
QPWBHB740WJZZ Product FFC used
DUNTKB732PM00 Product unit used
VSP0020P-B2WN Product unit used
QPWBHB736WJZZ Product FPC used
25
VL-Z7S/E/Z7E-A/Z7E-W
VL-Z8H
90ADDVC-TAPE (color bar)
RTPEVA001WJZZ
Parts cord
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