Electrical Adjustments - Sony HCD-RV777D Service Manual

HCD-RV777D/RV888D/RV999D
DVD SECTION
About the dicision to pass or fail of the optical pick-up block, refer
to "DICISION TO PASS OR FAIL OF THE OPTICAL PICK-UP
BLOCK" (see page 8)
TEST DISC LIST
Use the following test disc on test mode.
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.
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).
VIDEO SECTION
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%)
34
SECTION 6

ELECTRICAL ADJUSTMENTS

oscilloscope
75 Ω
1.00 ± 0.05 Vp-p
DECK SECTION
0 dB=0.775 V
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Tape Signal
P-4-A063 6.3 kHz, –10 dB
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
test tape
MAIN board
P-4-A063
IC101
(6.3 kHz, –10 dB)
Pin 28 (L-CH)
Pin 37 (R-CH)
set
MAIN board
IC101
Pin 38 (GND)
Used for
Azimuth Adjustment
level meter
+
–