Read Sony HCD-H100 / MHC-C10 / MHC-G100 Service Manual online
— 12 —
CD SECTION
Focus Bias Adjustment
CD Decoder
(1/2) board
(1/2) board
CN12
FEO
VC
DC voltmeter
Procedure:
1. Connect DC voltmeter to test point CN12 (FEO), (VC).
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust VR01 so that the DC voitmeter reading is 0
1. Connect DC voltmeter to test point CN12 (FEO), (VC).
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust VR01 so that the DC voitmeter reading is 0
±
0.1 V.
–
+
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF) on CD Decoder (1/2)
1. Connect oscilloscope to test point TP (RF) on CD Decoder (1/2)
board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
Note: Clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
TP (RF)
CN12 (VC)
CN12 (VC)
CD Decoder
(1/2) board
(1/2) board
oscilloscope
level: 1.0 Vp-p
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
+0.3
–0.2
–0.2
Adjustment Location
[CD DECODER (1/2) BOARD] — Component side —
CN21, VR01
Focus Bias Adjustment
Focus Bias Adjustment
CN12
IC03
CN12, TP (RF)
RF Level Check
RF Level Check
IC01
R07
TP
(RF)
(RF)
VR01
2
1
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