Sony TC-S90D Service Manual ▷ View online
9
TC-S90D
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
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-S90D
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
10
TC-S90D
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-S90D)
no mark : Button of Tape unit (TC-S90D)
*1
: Button of amplifier unit (TA-S90D)
*2
: Button of DVD/video CD/CD unit (DVP-S90D)
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
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
± 180 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
± 90 Hz.
Adjustment Location: LEAF SW board
Sample Volue of Wow and Flutter: 0.3% or less W. RMS
(WS-48B)
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
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-S90D
MD OUT jack
(J601)
(J601)
+
–
–
+
–
–
set
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
frequency counter
ST-S90D
MD OUT jack
(J601)
(J601)
set
test tape
P-4-L300J
(315 Hz, 0 dB)
P-4-L300J
(315 Hz, 0 dB)
ST-S90D
+
–
–
level meter
MD OUT jack
(J601)
(J601)
reverse
forward
x
11
TC-S90D
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-S90D
1) 315 Hz
2) 10 kHz
2) 10 kHz
50 mV (–23.8 dB)
600
Ω
blank tape
CS-123
CS-123
AF OSC
ST-S90D
+
–
–
set
recorded
portion
portion
level meter
MD OUT jack
(J601)
(J601)
ST-S90D
MD/VIDEO (AUDIO) IN (J601) : ST-S90D
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-S90D
+
–
–
set
recorded
portion
portion
level meter
MD OUT jack
(J601)
(J601)
ST-S90D
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
12
TC-S90D
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.
•
• X : parts extracted from the component side.
•
: Pattern from the side which enables seeing.
• Indication of transistor.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
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.
• C : panel designation.
• A : B+ Line.
• B : B– Line.
• Voltages and waveforms are dc with respect to ground
• 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 MΩ).
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.
Replace only with part number specified.
B
These are omitted.
C
E
Q
B
These are omitted.
C
E
Q
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