Adjusting The Electrical Circuits - Sharp VL-AX1S/H Service Manual

9. ADJUSTING THE ELECTRICAL CIRCUITS

Before starting the electric circuit adjustment
• The adjustment methods described herein are used, in most cases, when the expendable mechanical parts, including
the video head, have been replaced, at which time the electrical circuits need to be readjusted. Before adjusting the
electrical circuits, make sure that the mechanism works properly (i.e., the mechanism is properly adjusted). Incase of
the occurrence of any problem to the electrical circuits, be sure to use the specified measuring instruments to locate
the area to which the problem is occurring, and then take the necessary action, including repair, replacement or
adjustment, exactly as instructed in the electrical adjustment methods that will follow.
Do not attempt to make adjustments without using the proper measuring instruments.
• This machine is configured so that the electrical circuits inside its PWB unit are composed, for the most part, of high-
density, small surface-mounted component parts for downsized machine body.
To perform repair service or parts replacement, do so using a soldering iron, but in as short a time as possible; this is
because surface-mounted component parts are generally so small in size and susceptible to heat, as compared with
the large discrete parts used in TV sets, desk-top video decks, etc., that attempting to heat their electrodes for a longer
time than is necessary with a soldering iron may result in their becoming defective.
This applies particularly when replacing the laminated chip capacitors.
For this purpose, ceramic soldering irons with a temperature regulator are recommended (iron tip temperature 250°C
and soldering time 5 seconds or shorter).
VL-AX1S/H/E/EW/EX
Specifications of service jigs
No. Connection section
1 H/A PWB–H/A FPC
2 H/A FPC–MAIN
3 MAIN PWB–SUB PWB
4 MAIN PWB–SUB PWB
5 Power SW–MAIN PWB
6 V/F–MAIN PWB
7 DV/232C/ZOOM SW–
MAIN PWB
8 AVS/EJECT SW–
MAIN PWB
9 Hot shoe–SUB PWB
10 Battery Terminal–
MAIN PWB
11 VCR operation–SUB PWB SC3707
12 Focus Ring Unit–
MAIN PWB
13 Camera Operation FPC–
SUB PWB
14 Camera Operation FPC–
Camera Operation Unit
15 CAMCCD PWB–
CAMCCD FPC
16 CAMCCD FPC–
MAIN PWB
17 LCD PWB–MAIN PWB
18
TP Jig for Envelope confirmation
19 Built-in microphone–
SUB PWB
Connector REF. No. No. of pins
P306 80B-B
SC3301 80B-B
SC5701, SC5702 39P
SC5703 45P
SC703 17P
SC8801 21P
SC5704 21P
SC1401 21P
SC6602 12P
SC900 20B-B
10P
SC701 10P
SC3702 30B-B
30B-B
SC1002 39P
SC201 40B-B
SC2801 33P
SC3703 14B-B
P6601 4P
New or
Continuation
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VL-AX1S/H/E/EW/EX
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