Electrical Adjustment; Precaution - JVC GR-DV3000U Service Manual

Hide thumbs Also See for GR-DV3000U:

Instructions manual (96 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 (IC7302 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. In the following work, use the patch cords as required.

For details of the patch cords, see the "4.1 BOARD IN-

TERCONNECTIONS" (SECTION 4, CHART AND DIA-

GRAM).

3. Shortcircuit between operation un it and DECK chassis.

2. Required test equipment

1. Color TV monitor.

2. AC power adapter/charger

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

3. Tools required for adjustments

Torque driver

YTU94088

Tweezers

P-895

Table 3-1-1a

3-1

SECTION 3