JVC NX-CDR7R Service Manual

SERVICE MANUAL

COMPACT COMPONENT CDR SYSTEM

NX-CDR7R

Supplement

Area Suffix

Continental Europe

E EN

Northern Europe

NX-CDR7R

U.K.

Substitute the page 1-2 on this supplement for the page 1-3 on the original manual

(A drawing for "1-2 Handling the traverse unit"was missing.

Substitute the page 1-3,4,5 on this supplement for the page 1-29,30,31 on the original manual.

The CDR unit (Parts No.EMU-R7-11M) can be replaced as unit basis. Please make sure if the CDR unit is surely faulty with SYSTEM AGING 1 described on page 1-4 of this supplement.

Contents

Preventing static electricty-------------------------1-2 Adjustment method-----------------------------------1-3

Confirm method of operation-----------------------1-4

Check mode Service menu1

Service menu2------------------------------1-5

No.21030B

Nov. 2001

NX-CDR7

Preventing static electricity

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

1.1. Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players. Be careful to use proper grounding in the area where repairs are being performed.

1.1.1. Ground the workbench

1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

1.1.2. Ground yourself

1. Use an anti-static wrist strap to release any static electricity built up in your body.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

1.1.3. Handling the optical pickup

1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

2. Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode.

1.2. Handling the traverse unit (optical pickup)

1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.

2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector.

3. Handle the flexible cable carefully as it may break when subjected to strong force.

4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it

CN601

Solder part

Servo control board

1-2

+ 4 hidden pages