Nad C 660 Service Manual

Page 25

NOTES REGARDING COMPACT DISC PLAYER REPAIRS

1. Preparations

1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These compo-
nents are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage,
components can be damaged, and for that reason components should be handled with care.

2) The pick-up is composed of many optical components and other high-precision components. Care must
be taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong
magnetism is present, or where there is excessive dust.

2. Notes for repair

1) Before replacing a component part, first disconnect the power supply lead wire from the unit

2) All equipment, measuring instruments and tools must be grounded.

3) The workbench should be covered with a conductive sheet and grounded.
When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is
because there is the possibility of damage by static electricity.)

4) To prevent AC leakage, the metal part of the soldering iron should be grounded.

5) Workers should be grounded by an armband (1 M9)

6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent
static electricity changes in the clothing to escape from the armband.

7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.

Armband

Resistor

(1 Mohm)
T Resistor .
(1 Mohm) Conductive

Sheet

Page 35

l

Sled operation is abnormal.

ls th .
led control 53%| output. N0 Check the connection ol |C320
(I0320 pin 85) pin 85

NO

Is there
Sled drive voltage input?
(Iczos pin 23)

N0 Check the connection of ICZO1
pin 17.
Replace the |CZO1 (BA5925)

Is there
Sled drive volta e output. Is ActiMute signal "L"?
Iczoa pin 7, 18 (I0203 Pin9)

Replace the |0203 (BA5983)

Is there
HALL/SLDOUT signal input?
IC320 pin82

Is there HALL 1
signal input (l0206 pin3)

Is there
SLED FG signal input?
(IC320 pin97)

N0
Check the |CZO1 (BA5925)

l

-Check the Connector (PN201)
'Replace the SLED Motor.

.14-

NO

YES

Replace the |C320 (MICOM)

ll

Check the connection of ICBZO
pin 26.

Replace the |C206 (BU4053)

Page 42

LD CHECK (Nol Reading)

YES

Execute E.LD On of How to use
Test Tool(Dragon) : VRDC Lop
[Read Mode]

YES

PN101 Pin 32 (ENBL)=H?

-Check the connectlon of ICSIO pin 20.
-Check and replace the lCStO (CPLD).

IC108
Pin 12 (RREF):
(0.8+/-0.3V)?

-Check the connectlon of IC110 pin 18.
-Check and replace the |C110 (DAC).

-Check the connection at PN101 pin 19.
-Check and replace the PN101, PlCK
UP.

Pin 25 (VRDC):
(0.9:0.5V)?

-Check the connectlon of lClOS pin 13.
-Check and replace the lC108.

ll

Execute D.LD Inspection of
How to use Test Tool (Dragon)'

Check the Flu connector and
then replace the Flu

.21.

Page 72

A: 0660 (UL),B: 0660 (EUROPE) RUN DATE : 2001.11.14
LOCA.N0 PART NO. A B DESCRIPTION SPECIFIATION

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