Read Sony HCD-RG40 / MHC-DX30 / MHC-RG40 Service Manual online
18
HCD-DX30/RG40
Note :
Clear RF signal waveform means that the shape “
◊ ” can be clearly
distinguished at the center of the waveform.
E-F Balance (1 Track jump) Check
Procedure :
1. Connect oscilloscope to TP (TEO) and TP (VC).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the gG button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
1. Connect oscilloscope to TP (TEO) and TP (VC).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the gG button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
6. After check, remove the lead wire connected in step 1.
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point (XPCK) with lead wire.
1. Connect frequency counter to test point (XPCK) with lead wire.
2. Turned Power switch on.
3. Put the disc (YEDS-18) in to play the number five track.
3. Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.45
±
0.3Vp-p
TP(TEO)
TP(VC)
TP(VC)
BD board
oscilloscope
level=1.3
±
0.6Vp-p
symmetry
A (DC voltage)
center of
waveform
waveform
B
0V
1 track jump waveform
Specified level: ––
× 100=less than ±22%
B
A
BD board
TP (XPCK)
frequency counter
TP
(XPCK)
TP
(TEO)
TP
(FEO)
TP
(FEI)
TP
(RF)
TP
(VC)
TP
(DGND)
TP
(AGCCON)
1
12
24
1
20
21
40
60
80
41
61
IC101
IC103
Adjustment Location:
[BD BOARD] (Conductor Side)
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