JVC GR-D20EK Service Manual page 14

3.1 PREPARATION
(1) Precaution
This model does not contain adjustment controls (VR).
General deck system, camera system and monitor system
adjustment are not required. However, if MAIN board need
replacement, please use original EEP ROM on to new
board. Then adjustment are not required. And if parts such
as the following need replacement, special computerized
adjustment are required. 3.5.1 Electrical adjustment with
personal computer is setup and it adjusts using a service
support system. Please contact to JVC Service for detail in-
formation.
• OP BLOCK ASSEMBLY
• EEP ROM (IC1005 of MAIN board)
• MONITOR / VF ASSEMBLY
In the event of malfunction with electrical circuits, trouble-
shooting with the aid of proper test instruments most be
done first, and then commence necessary repair, replace-
ment and adjustment, etc.
a) In case of wiring to chip test points for measurement,
use IC clips, etc. to avoid any stress.
b) Since connectors are fragile, carefully handle them in
disconnecting and connecting.
c) Short circuit between operation unit and DECK chas-
sis.
(2) Required test equipment
a) Color TV monitor.
b) AC power adapter
c) Oscilloscope (dual-trace type, observable 100 MHz
or higher frequency)
• It is recommended to use one observable 300 MHz
or higher frequency.
d) Digital voltmeter
e) Frequency counter (with threshold level adjuster)
f) Personal computer
1-18 (No.86730)
SECTION 3
ADJUSTMENT
3.2 TOOLS REQUIRED FOR ADJUSTMENT
Alignment tape
1
INF adjustment lens
3
YTU92001B
Camera stand
5
YTU93079
Gray scale chart
7
YTU94133A
Jig connector cable
9
YTU93106B
Communication cable
11
YTU93107A
Service support system
13
YTU94057-67
Guide driver (Hexagonal)
2
MC-2
INF lens holder
4
Light box assembly
6
8
Extension connector
10
12
14
Fig.3-2-1
D-770-1.27
YTU94087
YTU93096A
Color bar chart
YTU94133C
YTU94145C-30
PC cable
QAM0099-005
Cleaning cloth
KSMM-01