JVC GC-QX3U, Service Manual

Page: 18 / 164

2-1
SECTION 2
ELECTRICAL ADJUSTMENT
2.1 ELECTRICAL ADJUSTMENT
2.1.1 Precautions
Both the camera section and deck section of this model
are designed and manufactured to be adjustment-free.
However, if both or either of the following parts is replaced,
it needs special adjustment with a personal computer at a
JVC service equipment after the part replacement
• OP block assembly
• EEPROM (on the MAIN board)
When there is some trouble in the electric circuit, it is required
to detect the faulty part with specified test instruments first
and then to proceed to repair, replacement and adjustment.
1. When cheking a signal at a chip test point, be sure to use
an IC clip or the like not to apply any stress to the test point.
When replacing a chip part (IC in particular), completely
remove solder chips from it and its periphery before
proceeding to part replacement (in order to avoid exfoliation
of the pattern).
2. Carefully disconnect/connect connectors because they
are apt to get damaged.
2.1.2 Test instruments required for electrical
adjustment
2.1.4 Setup (LCD ADJUSTMENT)
Setup for electrical adjustment with personal computer
Note 1:
As a general rule for adjustment with a personal
computer, connect a personal computer to its
PRINTER terminal.
Note 2:
Use DC cord to supply the power.
2.1.3 Required test equipment
1. Color TV monitor.
2. AC power adapter (AA-V37 or equivalent)
3. Oscilloscope (dual-trace type, for more than 20 MHz).
4. Digital voltmeter
5. Frequency counter (with threshold level adjuster)
6. Personal computer
PC cable
QAM0099-002
Personal computer
RS-232C
port
Service support system
YTU94057-47
MENU
PRINTER
Fig. 2-1-1 Setup for electrical adjustment with
personal computer (I)
1 2
Patch cord
YTU93099A
Jig connector cable
YTU93102A
7 8
INF adjustment lens
YTU92001B
Camera stand
YTU93079
5
Extension connector
YTU94145A
3 4
6
Jig connector cable
YTU93091B
PC cable
QAM0099-002
Service support system
YTU94057-47
9 10
Light box assembly
YTU93096A
Gray scale chart
YTU94133A
Cleaning cloth
KSMM-01
11
Color bar chart
YTU94133C
12
Smart media card
16MB
13
USB
QAM0252-001
14