CDP-M11C, CMT-M11C - Sony Audio Service Manual (repair manual). Page 12

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•

The BD test mode is used to check the BD block. When this
mode is activated, a mechanism is kept in stop status and GFS
is not monitored.
A checking status is displayed with disc LEDs.

•

1. Load a disc on the tray of disc 1 and have a disc chucked.
2. Turn off the power switch once, and connect TP (TEST) and

TP (GND) on MAIN board, then again turn on the power
switch.

3. Thus, the test mode is activated.
Note: When the test mode is activated, disc LEDs are all turned

off and GFS is not monitored.

•

Table 4-1.

6 OPEN/
CLOSE 1

6 OPEN/
CLOSE 2

6 OPEN/
CLOSE 3

LED on DISC 1 turns on,  normal focus
gain is set, and CLV is fixed to 12 cm.

LED on DISC 2 turns on, tracking servo
and sled servo are turned off.

LED on DISC 3 turns on, and tracking
balance value is displayed.

•

1. Turn off the power switch, and disconnect a short wire be-

tween TP (TEST) and TP (GND) on MAIN board.

2. Thus, the set becomes ready for normal operation.

Notes:
1. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise

indicated.

2. Use the oscilloscope with more than 10 M

Ω

 impedance.

3. Clean an object lens by an applicator with neutral detergent

when the signal level is low than specified value with the fol-
lowing checks.

4. Adjust the focus bias adjustment when optical pick-up is re-

placed.

This adjustment is to be done when the optical pick-up is replaced.

Condition: This adjustment is performed with the set placed hori-

zontally.

+
–

BD board

TP (RF)

TP (VC)

oscilloscope

(AC range)

Adjustment Procedure:
1. Connect the oscilloscope to TP (RF) and TP (VC) on BD board.
2. Turned power switch on. (Stop mode)
3. Put disc (YEDS-18) in and press the  

^  button.

4. Adjust RV101 so that the oscilloscope waveform is as shown

in the figure below (eye pattern).
A good eye pattern means that the diamond shape (≈) in the
center of the waveform can be clearly distinguished.

•

+
–

BD board

TP (FEO)

TP (VC)

oscilloscope

When observing the eye pattern, set the oscilloscope for AC
range and raise vertical sensitivity.

Procedure:
1. Connect the oscilloscope to TP (FEO) and TP (VC) on BD

board.

2. Connect the TP (FOK) and TP (GND) with lead wire.
3. Turned power switch on.
4. Put disc (YEDS-18) in and turned power switch on again and

actuate the focus search.  (actuate the focus search when disc
table is moving in and out.)

VOLT/DIV: 200 mV
TIME/DIV: 150 ns
(with the 10 : 1 probe
in use)

1.3 ± 0.3 Vp-p