Sony HCD-CP2 Service Manual page 12

[CD TEST MODE]
In the CD test mode, the set works as following sequence.
CD test mode sequence:
1. Enter the CD test mode
2. STOP mode
Press the u (CD)
button.
3. FOCUS mode
Press the u (CD)
button.
4. ALL SERVO
ON mode
Press the u (CD)
button.
5. LPC OFF
mode
Press the u (CD)
button.
6. TRACKING
GAIN UP mode
Press the u (CD)
button.
Note: TRACKING GAIN UP mode is not used in servicing.
1. Entering the CD Test Mode
1. Press the ?/1 button to turn the power ON.
[EJECT ]
Z
2. Press the button to open the disc tray, and put a
disc.
[EJECT ]
3. Press the Z button to close the disc tray.
4. Press the ?/1 button to turn the power OFF.
5. While pressing the both
[CD]
press the (function) button.
6. Enter the CD test mode, and display as below for a few sec-
onds.
Display
AUTO
F
* * * *
Note: Lights up "STEREO" indication
Does not light up "STEREO" indication :LPC OFF
*) LPC: Laser power control
7. Then display as below, and enter the STOP mode.
Display
* * * *
12
Press the x (CD)
button.
Press the x (CD)
button.
Press the x (CD)
button.
Press the x (CD)
button.
x (TAPE B) and x (CD) buttons,
STEREO
:LPC ON
STEREO
2. STOP Mode
[EJECT ]
1. Press the button twice to disc tray open and close.
Z
(All servo ON)
2. Press the > and .
to position of the track where signal is recorded.
3. FOCUS Mode
1. Press the u button to enter the FOCUS mode and display
as below. (Focus servo ON. CLV-S, tacking and sled servo OFF)
Display
F
* * * *
2. Connect an oscilloscope to TP (TE) and TP (VC) on the CD
board.
Connection:
oscilloscope
(DC range)
BD board
TP (TE)
TP (VC)
3. Confirm the traverse level and center values of waveform sat-
isfy specified value as follows.
Traverse waveform
0 V
Specified value:
traverse level A : more than 350 mVp-p
center values B : 0 ± 50 mV
button to move the optical pick-up
+
–
Center of the waveform
A
B (DC
voltage)