Electrical Adjustment; Precaution - JVC GR-DVL155EG Service Manual

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Instructions manual (68 pages)

Table Of Contents

Table of Contents

3.1 PRECAUTION

1. Precaution

Both the camera and deck sections of this model needs a

personal computer for adjustment except simple adjustment

with potentiometers. If some of the following parts is replaced

for repair or other reason, the repaired set must be adjusted

with a personal computer.

• OP block

• E

PROM (IC1003 of MAIN board)

• MONITOR

• E

PROM (IC7603 of MONITOR board)

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, replacement and

adjustment, etc.

1. In case of wiring to chip test points for measurement,

use IC clips, etc. to avoid any stress.

2. Since connectors are fragile, carefully handle them in dis-

connecting and connecting.

3. Shortcircuit between operation and DECK chassis.

2. Required test equipment

1. Color TV monitor.

2. AC adapter

3. Oscilloscope (dual-trace type, observable 100 MHz or

higher frequency)

Note : It is recommended to use one observable 300 MHz

or higher frequency.

4. Digital voltmeter

5. Frequency counter (with threshold level adjuster)

6. Personal computer

SECTION 3