Read Sony CDP-EX880 / CDP-MS717 / DHC-EX880MD / DHC-MD717 Service Manual online
– 14 –
2. RF LEVEL CHECK
Connection:
Procedure:
1. Connect the oscilloscope to TP (RF) and TP (VC) on BD board.
2. Turned power switch on.
3. Put disc (YEDS-18) in and press the
1. Connect the oscilloscope to TP (RF) and TP (VC) on BD board.
2. Turned power switch on.
3. Put disc (YEDS-18) in and press the
[ ]
button.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
Note:
Clear RF signal waveform means that the shape “≈” can be clearly
distinguished at the center of the waveform.
distinguished at the center of the waveform.
3. E-F BALANCE (TRAVERSE) CHECK
Connection:
Procedure:
1. Solder a lead wire to the TP301 (ADJ) on the MAIN board.
2. Connect the oscilloscope to TP (TEO) and TP (VC) on BD
1. Solder a lead wire to the TP301 (ADJ) on the MAIN board.
2. Connect the oscilloscope to TP (TEO) and TP (VC) on BD
board.
3. Turned power switch on.
4. Connect the lead wire connected in1, to the ground.
5. Put disc (YEDS-18) in and press the
4. Connect the lead wire connected in1, to the ground.
5. Put disc (YEDS-18) in and press the
[ ]
button.
6. Press the
[DISPLAY]
button. (Tracking servo and sled servo
are turned off.)
7. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0 Vdc, and check this level.
8. Release the lead wire.
+
–
–
BD board
TP (RF)
TP (VC)
oscilloscope
fl
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(with the 10 : 1 probe
in use)
TIME/DIV: 500 ns
(with the 10 : 1 probe
in use)
1.2
±
0.2 Vp-p
RF signal waveform
+
–
–
BD board
TP (TEO)
TP (VC)
oscilloscope
(DC range)
fl
Adjustment Location :
[BD BOARD] – Side B –
[MAIN BOARD] – Conductor Side –
TP (GND)
TP (VC)
TP (TEO)
FEO
IC103
IC101
TP
(FOK)
TP (RF)
IC102
IC301
TP301
(ADJ)
(ADJ)
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