Sony MHC-S3 / MHC-SV7AV / TC-S3 Service Manual ▷ View online
11
TC-S3
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
so that outputs match within 1dB of peak.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
Note:
Use following buttons in the test mode.
no mark : Button of Tape unit (TC-S3)
*1
: Button of amplifier unit (TA-S7AV or TA-S3)
*2
: Button of CD unit (CDP-S3)
Tape Speed Adjustment
DECK B
Note:
Start the Tape Speed adjustment as below after setting to the test
mode.
In the test mode, the tape speed is high during pressing the
mode.
In the test mode, the tape speed is high during pressing the
[HI-DUB]
button.
Procedure:
1. Turn the power switch on.
2. While pressing the both
1. Turn the power switch on.
2. While pressing the both
[PLAY MODE]
*
2
and
[ ]
*
2
buttons,
press the
[DISC 3]
*
2
button.
(The “GROOVE” on the fluorescent indicator tube display
while in the test mode.)
To exit from the test mode, press the
while in the test mode.)
To exit from the test mode, press the
?/1
*
1
button.
Mode: Playback
1. Insert the WS-48B into the deck B.
2. Press the N button on the deck B.
3. Press the
2. Press the N button on the deck B.
3. Press the
[HI-DUB]
button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board so that frequency
counter reads 6,000
±
30 Hz.
5. Press the
[HI-DUB]
button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000
±
15 Hz.
Adjustment Location: LEAF SW board
Playback level Adjustment
DECK A DECK B
Procedure:
Mode: Playback
Mode: Playback
1. Confirm that level difference between the channels is with
±
0.5 dB.
2. After check, adjust the following RVs.
Deck A is RV302 (L-CH), Deck B is RV303 (L-CH) so that
adjustment within adjustment level as follows.
adjustment within adjustment level as follows.
Adjustment Level:
MD OUT jack (J601) PB level: 334.4 to 748.7 mV
(–6.8
±
0.5 dB)
Adjustment Location: MAIN board
Sample Volue of Wow and Flutter: 0.3% or less W. RMS
(WS-48B)
Screw
position
position
L-CH
peak
peak
within
1dB
1dB
Output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
1dB
1dB
Screw
position
position
R-CH
peak
peak
set
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
oscilloscope
L-CH
R-CH
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
ST-
S3/S5/SV7
S3/S5/SV7
MD OUT jack
(J601)
(J601)
+
–
–
+
–
–
set
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
frequency counter
ST-
S3/S5/SV7
S3/S5/SV7
MD OUT jack
(J601)
(J601)
set
test tape
P-4-L300J
(315 Hz, 0 dB)
P-4-L300J
(315 Hz, 0 dB)
ST-
S3/S5/SV7
S3/S5/SV7
+
–
–
level meter
MD OUT jack
(J601)
(J601)
reverse
forward
x
12
TC-S3
Adjustable level:
MD OUT jack PB level: 47.2 to 53.0 mV (–27.3 to –26.3 dB)
Adjustment Location: MAIN board
MD OUT jack PB level: 47.2 to 53.0 mV (–27.3 to –26.3 dB)
Adjustment Location: MAIN board
[MAIN BOARD] (Component Side)
[LEAF SW BOARD] (Component Side)
REC Bias Adjustment
DECK B
Procedure:
1. Insert a tape into Deck B.
2. After press
1. Insert a tape into Deck B.
2. After press
[REC PAUSE/START]
button,
press
[REC PAUSE/START]
button, then recording start.
3. Mode: Record
4. Mode: Playback
5. Confirm the playback signal recorded in step 3 becomes ad-
justable level as follows.
If these levels are not adjustable level, adjust the RV304 (L-
CH) and RV354 (R-CH) on the MAIN board to repeat steps 4
and 5.
If these levels are not adjustable level, adjust the RV304 (L-
CH) and RV354 (R-CH) on the MAIN board to repeat steps 4
and 5.
Adjustable level: Playback output of 315 Hz to playback output
of 10 kHz:
±
1.0 dB
Adjustment Location: MAIN board
REC Level Adjustment
DECK B
Procedure:
1. Insert a tape into Deck B.
2. After press
1. Insert a tape into Deck B.
2. After press
[REC PAUSE/START]
button, press
[REC PAUSE/START]
button, then recording start.
3. Mode: Record
4. Mode: Playback
5. Confirm the play back signal recorded in step 3 becomes ad-
justable level as follows.
If these levels are not adjustable level, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 4
and 5.
If these levels are not adjustable level, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 4
and 5.
attenuator
set
MD/VIDEO (AUDIO) IN (J601): ST-S3/S5/SV7
1) 315 Hz
2) 10 kHz
2) 10 kHz
50 mV (–23.8 dB)
600
Ω
blank tape
CN-123
CN-123
AF OSC
ST-
S3/S5/SV7
S3/S5/SV7
+
–
–
set
recorded
portion
portion
level meter
MD OUT jack
(J601)
(J601)
ST-
S3/S5/SV7
S3/S5/SV7
MD/VIDEO (AUDIO) IN (J601) : ST-S3/S5/SV7
315 Hz, 50 mV (–23.8 dB)
315 Hz, 50 mV (–23.8 dB)
blank tape
CS-123
CS-123
attenuator
set
600
Ω
AF OSC
ST-
S3/S5/SV7
S3/S5/SV7
+
–
–
set
recorded
portion
portion
level meter
MD OUT jack
(J601)
(J601)
ST-
S3/S5/SV7
S3/S5/SV7
TAPE SPEED
RV1002
RV1001
(NORMAL) (HIGH)
CN1001
DECK A
PB LEVEL
(L-CH)
REC LEVEL
(R-CH)
DECK B
PB LEVEL
(L-CH)
REC LEVEL
(L-CH)
REC BIAS
(R-CH)
REC BIAS
(L-CH)
RV302
RV303
RV354
RV304
RV301
RV351
CN311
IC303
IC302
TC-S3
13
13
SECTION 7
DIAGRAMS
7-1.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Boards:
•
•
X
: parts extracted from the component side.
•
: Pattern from the side which enables seeing.
• Indication of transistor.
B
These are omitted.
C
E
Q
B
These are omitted.
C
E
Q
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
5
: fusible resistor.
•
C
: panel designation.
•
A
: B+ Line.
•
B
: B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : STOP
(
no mark : STOP
(
) : PB
〈〈
〉〉
: REC
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
E
: PB
a
: REC
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
• Waveforms
– MAIN Board –
– MAIN Board –
1
T301
4
(DECK-B REC mode)
2
Q301, 303 (collector) (REC mode)
3
NO312
6
(L-REC),
3
(R-REC)
(DECK-B REC mode)
120 Vp-p
13
µ
s
10 Vp-p
13
µ
s
52 Vp-p
13
µ
s
• IC Block Diagram
– MAIN Board –
– MAIN Board –
IC302
µ
PC1330HA
1
2
3
4
5
6
7
8
9
INVERTER
COMPARATER
SW R1
GND
SW P1 CONT
GND
VCC
SW P2 GND
SW R2
• Circuit Boards Location
LEAF SW board
HEAD (A) board
HEAD (B) board
TC-SUB PANEL-A board
TC-SUB PANEL-B board
TC-PANEL-A DECK board
TC-PANEL-B DECK board
MAIN board
TC-S3
14
14
7-2.
SCHEMATIC DIAGRAM – MAIN Section (1/2) –
•
See page 13 for Waveforms.
•
See page 13 for IC Block Diagram.
The components identified by mark
0
or dotted
line with mark
0
are critical for safety.
Replace only with part number specified.
CN314
R386
TP405
TP406
TP407
TP408
TP409
C335
T301
C336
R342
R343
Q302
C337
R344
C338
R345
C339
C340
R346
C341
C342
L302
L303
R369
C350
C349
C348
R368
R367
C384
C334
RV354
C382
L351
C383
C333
L301
C332
R321
R349
R348
C347
C367
Q304
Q305
TP344
TP343
TP345
TP346
TP347
TP348
C372
R371
C386
R372
C373
R373
R370
C371
TP342
TP341
TP340
C321
R330
C385
R331
R332
C323
R333
C322
C324
RV302
C374
C378
R376
R377
R378
R379
C379
R338
C329
R339
R337
C377
R375
C376
R336
C328
R335
R334
R340
C330
RV303
C380
R402
R403
R404
R405
Q301
Q310
R341
R347
TP370
Q303
C327
C326
RV304
CN1
HP901
HRPE901
CN2
IC304(2/2)
IC304(1/2)
IC303(2/2)
IC303(1/2)
NO313
NO312
IC302
R374
R380
7P
270
0.01
100V
100V
2.2
50V
50V
5.6
5.6
2SC2001
0.015
18k
0.0068
18k
0.0068
0.018
5.6k
1
50V
47
16V
470
10
50V
10
50V
0.1
1.2k
1k
27p
27p
220k
120p
27mH
330p
330p
27mH
120p
12k
4.7k
220
10 50V
0.001
BN1A4M
BA1A4M
100p
100
100
10V
10V
5.6k
0.022
130k
120k
390p
390p
120k
100
10V
10V
100
5.6k
0.022
130k
100p
100
16V
16V
2.2k
100
16V
16V
100p
220
22k
12k
270k
0.01
12k
0.01
270k
22k
100
10V
10V
120k
390p
220
100p
120k
220
220
100
16V
16V
2.2k
100
16V
16V
1.5k
820
1.5k
820
2SD1387
2SC2785
12k
22k
2SC2001
100
10V
10V
390p
220k
NJM4580MD-D
NJM4580MD-D
NJM4580MD-D
NJM4580MD-D
3P
8P
JW
JW
1
2
3
4
5
6
7
8
Y6
B-FWD
B-REV
A-REV
A-FWD
T1
T2
T4
T5
T
6
T
3
T7
SW
.R
1
GN
D
GN
D
G
N
D
SW
.P1
C
O
NT.
V
C
C
S
W
.P
2
S
W
.R2
L-PB
R-PB
+6V
L-PB
L-REC
R-PB
E-HOT
R-REC
E+6V
E+6V
E+6V
D+5V
DGND
5
6
8
7
3
2
4
1
DECK B PB AMP
5
6
7
4
8
3
2
1
DECK A PB AMP
REC/PB SWITCH
REC/PB SWITCH
Q304,305
CONTROL
CONTROL
REC BIAS
LEVEL SHIFT
Q302,303
BIAS OSC
L-PB
+6V
R-PB
L-PB
E+6V
L-REC
R-PB
E+6V
R-REC
E-HOT
E+6V
L-CH
R-CH
TAPE
ERASE
R-CH
L-CH
(REC/PB/ERASE)
(DECK B)
(DECK A)
(PB)
MECHANISM DECK
(CHASSIS)
(CHASSIS)
BLOCK
TCM-230AWR41
/230MWR41
LED-B-FWD
KEY1
LED-B-REV
LED-A-REV
LED-A-FWD
µ
PC1330HA
220
µ
H
220
µ
H
(Page 18)
(Page 15)
Click on the first or last page to see other MHC-S3 / MHC-SV7AV / TC-S3 service manuals if exist.