Note Of Transformer; Decision To Pass Or Fail Of The Optical Pick-Up Block - Sony HCD-RV777D Service Manual

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3 7 63 1515 0

1-5. NOTE OF TRANSFORMER

Pull the power cord in the direction of the arrow A
with care to keep the cord from
contact with the transformer (T901).
Then fix the cord using two clips
indicated by the arrow B .
TE
L 13942296513

1-6. DECISION TO PASS OR FAIL OF THE OPTICAL PICK-UP BLOCK

Connection:
DMB07 board
CN901 pin 1
CN901 pin 3
Procedure:
1. Connect an oscilloscope to test point 1 pin and 3 pin of CN901
on the DMB07 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.
www
RF signal waveform
.
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B
B
back panel
australian, saudi arabia
model only
NOTE: Make sure that the power cord is distant
more than 3mm from the transformer (T901).
oscilloscope
+
–
VOLT/DIV : 200 mV
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y
TIME/DIV : 500 nS
i
CD : 1.05 ± 0.2 Vp-p
DVD : 1.09 ± 0.2 Vp-p
http://www.xiaoyu163.com
HCD-RV777D/RV888D/RV999D
2 9
8
power cord
more than 3mm
A
Q Q
3 6 7 1 3 1 5
Checking Location:
– DMB07 BOARD (SIDE A) –
co
.
9 4 2 8
transformer
(T901)
SUB TRANS board
0 5 8 2 9 9 4 2 8
CN901
1 7
m
9 9
9 9
9