Sony MHC-S3 / MHC-SV7AV / TC-S3 Service Manual ▷ View online
9
TC-S3
SECTION 4
TEST MODE
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)
[MC Test Mode]
Enter the MC Test Mode
Procedure:
1. Press the
1. Press the
I
/
1
*
1
button to turn the power on.
2. While pressing the both
[PLAY MODE]
*
2
and
[ ]
*
2
buttons,
press the
[DISC 3]
*
2
button.
3. “GROOVE” indication blinks on the fluorescent indicator tube
in the midst of MC test mode.
Releasing the MC Test Mode
To release from this mode, press the
I
/
1
*
1
button or disconnect
the power cord.
[DECK Test Mode]
In the DECK test mode, it operates as follows.
Cancellation of the linear mute of DOLBY IC (IC301)
• It become cancellation automatically when it is possible to en-
ter a MC test mode.
AMS checking
Procedure:
1. Enter the MC test mode.
2. Insert a test tape AMS-110A or AMS-120 to Deck A.
3. Set TAPE A function.
4. Press the
1. Enter the MC test mode.
2. Insert a test tape AMS-110A or AMS-120 to Deck A.
3. Set TAPE A function.
4. Press the
[CD SYNC]
button to enter the AMS test mode.
5. After a tape is rewound first, the FF AMS is checked, and the
mechanism is shut off after detecting the ASM signal twice.
6. Then the REW AMS is checked and the mechanism is shut off
after detecting the AMS signal twice.
7. When the check is complete, a message of either OK or NG
appears.
(To check an AMS of the B deck, select TAPE B function.
After that, press
After that, press
[CD SYNC]
.)
x
ALC checking
Procedure:
1. Enter the MC test mode.
2. Insert a tape into Deck B.
3. During Recording, Keep holding down the below keys.
1. Enter the MC test mode.
2. Insert a tape into Deck B.
3. During Recording, Keep holding down the below keys.
[ ]
*
2
+
[REC PAUSE/START]
ALC could keep ON while these keys keep being pressed, ALC
could keep OFF while keys are released.
could keep OFF while keys are released.
Double speed REC mode
Procedure:
1. Enter the MC test mode
2. Insert a tape into Deck B.
3. During Recording, keep holding down the below key.
1. Enter the MC test mode
2. Insert a tape into Deck B.
3. During Recording, keep holding down the below key.
[HI-DUB]
Double speed recording is going on while the key keeps being
pressed.
pressed.
REC/PLAY checking
• The mode to PLAY by rewinding recording contents automati-
cally.
Procedure:
1. If recording A surface, it returns automatically at the point of
1. If recording A surface, it returns automatically at the point of
the recording beginning and it replays when pressing
TAPE B
TAPE B
[ ]
.
2. If recording B surface, it returns automatically at the point of
the recording beginning and it replays when pressing
TAPE B
TAPE B
[ ]
.
x
M
m
10
TC-S3
SECTION 5
MECHANICAL ADJUSTMENTS
SECTION 6
ELECTRICAL ADJUSTMENTS
0 dB=0.775 V
DECK SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit ad-
justment should be completed before performing recording
circuit adjustment.)
justment should be completed before performing recording
circuit adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless other-
wise specified.
8. Please refer to “SERVICING NOTES” (page 3) before adjust-
ments.
• Test Tape
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
P-4-L300J
315 Hz, 0 dB
Level Adjustment
DECK A DECK B
Record/Playback Head Azimuth Adjustment
Note:
Perform this adjustments for both decks
Procedure:
1. Mode: Playback
1. Mode: Playback
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads
pinch rollers
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
set
ST-
S3/S5/SV7
S3/S5/SV7
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
+
–
–
level meter
MD OUT jack
(J601)
(J601)
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
6.96 N • m to 14.02 N • m
71 to 143 g • cm
(0.98 – 1.99 oz • inch)
9.80 N • m
100 g or more
(3.53 oz or more)
9.80 N • m
100 g or more
(3.53 oz or more)
Mode
Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
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
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