SONY GVD900
Service Manual

SERVICE NOTE
1. POWER SUPPLY DURING REPAIRS

In this unit, about 5 seconds after power is supplied (8.4V) to the battery terminal using the service power cord (J-6082-223-A), the power is shut off so that the unit cannot operate. This following two methods are available to prevent this. Take note of which to use during repairs.
Battery terminal �

Battery sig terminal

Method 1.
Connect the servicing remote commander RM-95 (J-6082-053-B) to the LANC jack, and set the remote commander switch to the �ADJ� side.
Battery switch

Method 2.
Press the following battery switch using adhesive tape, etc.

Battery terminal �

2.

HOW TO TAKE A CASSETTE OUT WHEN THE MAIN POWER CANNOT BE TURNED ON (FORCED EJECTED)

Procedure: 1. Remove the cassette lid referring to the section �2. DISASSEMBLY, 2-1�. 2. Remove the operation switch block (FK-71 board) referring to the section �2. DISASSEMBLY, 2-5�. 3. Remove the CB-61 board referring to section �2. DISASSEMBLY, 2-4�, and remove the FP-586 flexible board from CN3140 (4P) on the RJ-77 board. 4. Apply +4.5 V from the regulated power supply to the loading motor terminal as shown below and remove the cassette. CAUTION: Be careful not contact with the lid frame assembly when applying +4.5 V.

Control switch block

Regulated power supply

4.5V GND

Lid frame assembly Loading motor

3.

WARNING INDICATORS

If the CAUTION lamp flashes, but no indicators appear on the LCD screen or on the monitor TV screen, it means that an error occurs either in the fan motor or in the fan motor drive circuit. Refer to the schematic diagram on page 4-43 for repair.

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