Sony AVD-S50 Service Manual page 121

SERVICE MANUAL
Ver 1.4 2004. 09
ELECTRICAL ADJUSTMENTS
Note:
1. VIDEO board is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use DVD reference disc unless othermise indicated.
[DVD reference disc]
LUV-P01 (CD) : PART No. 4-999-032-01
TDV-520CSO (DVD-SL) : PART No. J-2501-236-A
TDV-540C (DVD-DL) : PART No. J-2501-235-A
Note: Do not use exiting test disc for DVD.
3. Use an oscilloscope with more than 10 MΩ impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
1. AUTO SERVO ADJUSTMENT
After parts related to the servo circuit (RF amplifier (IC001), DSP
(IC1025), motor driver (IC1024), EEPROM (IC1028) so on) are
replaced, re-adjusting the servo circuit is necessary. Select "ALL"
at "1. DRIVE AUTO ADJUSTMENT" (Refer to service manual
page 15 in TEST MODE) and adjust DVD-SL (single layer), CD
and DVD-DL (dual layer).
2. DECISION TO PASS OR FAIL OF THE OPTICAL
PICK-UP BLOCK
Connection:
DVD board
CN301 pin 1
CN301 pin 3
9-874-154-82
AVD-S50/S50ES
SUPPLEMENT-2
File this supplement with the service manual.
Subject : Addition of Electrical Adjustments.
oscilloscope
+
–
Procedure:
1. Connect an oscilloscope to test point 1 pin and 3 pin of CN901
on the DVD board.
2. Turn the power on.
3. Put the disc (LUV-P01) (Part No.: 4-999-032-01) (CD) in to
playback.
4. Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
5. Put the disc (TDV-520CSO) (Part No.: J-2501-236-A) (DVD)
in to playback.
6. Perform Comfirmation in the same manner as step 4.
Note: A clear RF signal waveform means that the shape "◊" can be clearly
distinguished at the center of the waveform.
RF signal waveform
Checking Location:
– DVD BOARD (SIDE A) –
CN301
7
1
US Model
Canadian Model
AVD-S50ES
AEP Model
UK Model
AVD-S50
VOLT/DIV : 200 mV
TIME/DIV : 500 nS
CD : 1.05 ± 0.2 Vp-p
DVD : 1.09 ± 0.2 Vp-p
1