Read Sony HTC-WX5 / MHC-WX5 / MHC-WX7AV Service Manual online
HTC-WX5
13
13
CD SECTION
Note:
1.
CD Block is basically constructed to operate without
adjustment. Therefore, check each item in order given.
adjustment. Therefore, check each item in order given.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10M
Ω
impedance.
4.
Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
when the signal level is low than specified value with the
following checks.
S Curve Check
Procedure :
1.
1.
Connect oscilloscope to test point TP (FEO).
2.
Connect between test point TP (FOK) and Ground by lead wire.
3.
Turn Power switch on.
4.
Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
5.
Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3 ±
1Vp-p.
between A and B. And confirm peak to peak level within 3 ±
1Vp-p.
S-curve waveform
6.
After check, remove the lead wire connected in step 2.
Note:
• Try to measure several times to make sure than the ratio of
A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the bright-
ness to obtain best waveform.
RF Level Check
Procedure :
1.
1.
Connect oscilloscope to test point TP (RF) on BD 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 level is correct or not.
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.
RF signal waveform
Procedure:
1.
1.
Connect oscilloscope to test point TP (TEO) on BD board.
2.
Turned Power switch on.
3.
Put disc (YEDS-18) in to play the number five track.
4.
Press the “
P (Pause)” button.
5.
Check the level B of the oscilloscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following:
(DC voltage) of the center of the Traverse waveform.
Confirm the following:
• A/B x 100 = less then ± 7 (%)
• B = 500 ± 100 mVp-p
• B = 500 ± 100 mVp-p
1 track jump waveform
Adjustment Location:
[BD BOARD] (Conductor Side)
E-F Balance (1 Track Jump) check
oscilloscope
BD board
TP (FEO)
TP (VC)
TP (VC)
symmetry
A
B
Within 3
±
1 Vp-p
oscilloscope
BD board
TP (RF)
TP (VC)
TP (VC)
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.3
±
0.3 Vp-p
oscilloscope
BD board
TP (TEO)
TP (VC)
TP (VC)
0V
Center of the waveform
B
Symmetry
A (DC voitage)
level : 500 mV
±
100 mVp-p
TP (RF)
TP
(FOK)
(FOK)
IC101
TP
(VC)
TP
(GND)
(GND)
TP
(TEO)
TP
(FEO)
(FEO)
IC103
IC102
IC102
CN101
[MAIN BOARD] (Component Side)
Record Bias Adjustment (Deck B)
Procedure:
1.
Press the
p (CD) button while pressing the DIRECTION
MODE button.
2.
While pressing the
p (CD) button, press the ª (TAPE A)
button, set the function to “deck B”.
3.
Insert a tape into deck B, press the
r REC button, and then
press the
( button to start recording.
4.
Mode: Record
6.
Confirm playback the signal recorded in step 2 become
adjustment level as follows.
If these levels do not adjustment level, adjust the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps 3
and 4.
adjustment level as follows.
If these levels do not adjustment level, adjust the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps 3
and 4.
Adjustment level: The playback output of 10 kHz level difference
against 315 Hz reference should be ± 1.0 dB.
Adjustment Location: AUDIO board
Record Level Adjustment (Deck B)
Procedure:
1.
Press the
p (CD) button while pressing the DIRECTION
MODE button.
2.
While pressing the
p (CD) button, press the ª (TAPE A)
button, set the function to “deck B”.
3.
Insert a tape into deck B, press the
r REC button, and then
press the
( button to start recording.
4.
Mode: Record
5.
Mode: Playback
6.
Confirm playback the signal recorded in step 2 become
adjustment level as follows.
If these levels do not adjustment level, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 3
and 4.
adjustment level as follows.
If these levels do not adjustment level, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 3
and 4.
Adjustment level: Output point from PFJ-1 playback level: 47.2
to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
5.
Mode: Playback
RV441 RV341
RV301(Lch),RV401(Rch)
Playback Level (Deck B)
Playback Level (Deck B)
RV301 RV401
RV341(Lch),RV441(Rch)
Record Bias
Record Bias
RV311(Lch),RV411(Rch)
Playback Level (Deck A)
Playback Level (Deck A)
RV311
RV411
CNS102
CNP105
CNS101
RV351
Record
Level (R ch)
RV301
Record
Level (L ch)
recorded
position
position
level meter
set
PFJ-1
output
point
recorded
position
position
level meter
set
PFJ-1
output
point
AF OSC
INPUT POINT
1) 315 Hz
2) 10 kHz
1) 315 Hz
2) 10 kHz
blank tape
CS-123
CS-123
PFJ-1
set
attenuator
600
Ω
} 50 mV (–23.8 dB)
AF OSC
blank tape
CS-123
CS-123
PFJ-1
set
attenuator
600
Ω
INPUT POINT
315Hz 50 mV (–23.8 dB)
315Hz 50 mV (–23.8 dB)
[AUDIO BOARD] (Component Side)
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