SECTION 3
ELECTRICAL ADJUSTMENT
3.1 PREPARATION3. Oscilloscope (dual-trace type, observable 100 MHz or
1. Precautionhigher frequency)
This model does not contain adjustment controls (VR).Note:It is recommended to use one observable 300 MHz or
General deck system, camera system and monitor systemhigher frequency.
adjustment are not required. However, if MAIN board and4. Digital voltmeter
MONITOR board need replacement, please use original5. Frequency counter (with threshold level adjuster)
2
EPROM on to new board. Then adjustment are not required.
6. Personal computer
And if parts such as the following need replacement, special
computerized adjustment are required (Refer to sec. 3.1.1-
3. Required adjustment tools
3). Please contact to JVC Service for detaile information.
For detsails of special jigs necessary for adjustment, refer to
Y OP block
page 1-2 and 1-3 of the Section 1.
Y E2PROM (IC1003 of MAIN board)
Y MONITOR
3.2 E. VF SECTION ADJUSTMENT (B/W VF ONLY)
2
Y EPROM (IC7603 of MONITOR board)
Referring to OSEC. 1 DISASSEMBLY� and connect the E.VF
Note: For B/W VF assembly adjustment is needed VRs.
FPC to CN104 of the MAIN board.
In the event of malfunction with electrical circuits, trouble-
Note:This adjustment can be carried out in the condition that
shooting with the aid of proper test instruments most be
only the exterior part (EYE PIECE ASSY, VF CASE
done first, and then commence necessary repair, replace-
[U]) is removed from the viewfinder.
ment and adjustment, etc.
With meticulous care not to damage any part, remove
the VF case (U) and expose the VF board assembly by
1. In case of wiring to chip test points for measurement, use
taking it out and carry out this adjustment using the
IC clips, etc. to avoid any stress.
patch cord for connection.
2. Since connectors are fragile, carefully handle them in
disconnecting and connecting.
3. Shortcircuit between operation un it and DECK chassis.VF CASE(U)
EYE PIECE ASSY
2. Required test equipment
1. Color TV monitor.
2. AC power adapter
BRACKET(VF)
3.3 SETUP
1. Setup for electrical adjustment with personal computer
Service support s
YTU94057-41
JJLIP
RS232C
port
MENU
PC cable
QAM0099-002
Personal computer
Fig. 3-3-1 Connection for Service support system (1)
3-1 |
ACEC
JVC
