Sony HCD-DP900D Service Manual page 20

HCD-DP900D
Ver 1.5
DVD SECTION
RE-ADJUSTMENT OF THE SERVO CIRCUIT
The re-adjustment of the servo circuit is necessary
when the part which relates to the servo circuit is
replaced.
Referring to "4-9. DRIVE AUTO ADJUSTMENT"
(SUPPLEMENT-1 see page 6), Choose ALL and do
the re-adjustment of each item of DVD-SL, CD and
DVD-DL.
THE PART THAT THE RE-ADJUSTMENT OF THE
SERVO CIRCUIT IS NECESSARY
11. Optical pick-up
12. RF AMP (IC001)
13. DSP IC (IC302)
14. Motor driver IC (IC401)
15. EEPROM (IC303)
Note :
1. DVD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use HLX-504 (J-6090-088-A) or HLX-505 (J-6090-089-A)
unless otherwise indicated.
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.
Video Level Adjustment (MB BOARD)
Purpose
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.
75 Ω
set
J601
VIDEO OUTPUT
Procedure:
1. Connect oscilloscope to VIDEO output.
2. Load a disc (HLX-504 or HL-505) playback.
3. Adjust the RV501 to attain 1.0±0.1Vp-p.
(WHITE 75%)
20
Oscilloscope
1.0 ± 0.1 Vp-p
S-terminal Output Check
Purpose
Check S-video output.
set
G
G
J602
S-VIDEO OUTPUT
Procedure:
1. Connect oscilloscope to S-VIDEO out. (S-Y teminal)
2. Load a disc (HLX-504 or HL-505) playback.
3. Confirm that the S-Y level is 1.0 ± 0.1Vp-p.
4. Connect oscilloscope to S-VIDEO output. (S-C teminal)
5. Connect that the S-C burst is 286 ± 50mVp-p.
Adjustment Location
MB BOARD (SIDE A)
RV501
IC503
VIDEO LEVEL
Adjustment
CN008
CN404
Oscilloscope
75 Ω
1.0 ± 0.1 Vp-p
286 ± 80 mVp-p
CN011
IC103
CN103