Electrical Adjustments - Sony HCD-RV990D Service Manual

VIDEO SECTION
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)
TDV-520CSO (DVD-SL) : PART No. J-2501-236-A
TDV-540C (DVD-DL)
Note: Do not use exiting test disc for DVD.
3. Use an oscilloscope with more than 10MΩ 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.
AUTO SERVO ADJUSTMENT
After parts related to the servo circuit (RF amplifier (IC001), DSP
(IC509), motor driver (IC501), EEPROM (IC903) so on) are
replaced, re-adjusting the servo circuit is necessary. Select "ALL"
at "1. DRIVE AUTO ADJUSTMENT" (Refer to page 8 in TEST
MODE) and adjust DVD-SL (single layer), CD and DVD-DL (dual
layer).
DECISION TO PASS OR FAIL OF THE OPTICAL
PICK-UP BLOCK
Connection:
DMB03 board
CN901 pin 1
CN901 pin 3
Procedure:
1. Connect an oscilloscope to test point pin 1 and pin 3 of CN901
on the DMB03 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

4. ELECTRICAL ADJUSTMENTS

: PART No. 4-999-032-01
: PART No. J-2501-235-A
oscilloscope
+
–
VOLT/DIV : 200 mV
TIME/DIV : 500 nS
CD : 1.05 ± 0.2 Vp-p
DVD : 1.09 ± 0.2 Vp-p
HCD-RV660D/RV990D
Checking Location:
– DMB03 BOARD (SIDE A) –
Video Level Check (VIDEO BOARD)
Purpose
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.
set
J802
VIDEO OUTPUT
Procedure:
1. Connect oscilloscope to VIDEO output.
2. Load a DVD reference disc playback.
3. Check the video signal level is 1.00±0.05Vp-p.
(WHITE 100%)
Ver 1.3
CN901
1
7
oscilloscope
75 Ω
1.00 ± 0.05 Vp-p
15