Sony TC-SD1 Service Manual ▷ View online
— 29 —
SECTION 4
MECHANICAL ADJUSTMENT
SECTION 5
ELECTRICAL ADJUSTMENT
• Torque Measurement
• Tape Tension
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads
record/playback heads
pinch rollers
erase head
rubber belts
capstan
idlers
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 adjusted.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
31 to 61 g • cm
2 to 6 g • cm
36 to 61 g • cm
2 to 6 g • cm
61 to 143 g • cm
Mode
FWD
FWD
back tension
REV
REV
back tension
FF/REW
Torque meter
CQ-102C
CQ-102RC
CQ-201B
Meter reading
FWD tension
REV tension
CQ-403A
CQ-403R
100 g or more
100 g or more
Precaution
1. Perform adjusting on the test mode.
2. Demagnetize the record/playback head with a head
2. Demagnetize the record/playback head with a head
demagnetizer.
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 adjust.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
6. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
should be completed before performing recording circuit
adjustment.)
7. The adjustments should be performed for both L-CH and R-
CH.
8. Switches should be set as follows.
DOLBY NR ..................................................................... OFF
DIRECTION .................................................................... A
DIRECTION .................................................................... A
•
Standard Recording Position
Adjust the REC LEVEL (VR02) control so that the standard input/
output signal level is obtained in the following connection.
output signal level is obtained in the following connection.
— Record Mode —
Standard Input Level
Input terminal
LINE IN
source impedance
10k
Ω
input signal level
0.5V (–3.8dB)
Standard Output Level
Output terminal
LINE OUT
load impedance
47kW
output signal level
0.5V (–3.8dB)
0dB = 0.775 V
Test Mode
Turn OFF the main power and insert the shorting plug to the test
point CN13 (2P) on the CONTROL board (setting IC05 pin 22 to
“L”). Then turn ON the main power which activate the TEST mode.
All displays flash once.
If a recording is performed in the TEST mode, the REC MEMORY
mode becomes active at the moment of recording so that the tape is
rewound by the amount of recording when a tape is rewound after
recording.
After adjustment, be sure to remove the shorting plug from the test
point CN13 (2P).
point CN13 (2P) on the CONTROL board (setting IC05 pin 22 to
“L”). Then turn ON the main power which activate the TEST mode.
All displays flash once.
If a recording is performed in the TEST mode, the REC MEMORY
mode becomes active at the moment of recording so that the tape is
rewound by the amount of recording when a tape is rewound after
recording.
After adjustment, be sure to remove the shorting plug from the test
point CN13 (2P).
Test Tape
Type
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
P-4-L300
315 Hz, 0 dB
PB Level Adjustment
10k
Ω
47k
Ω
600
Ω
audio oscillator
attenuator
LINE IN
LINE OUT
level meter
set
— 30 —
L-CH peak
L-CH peak
R-CH peak
R-CH peak
screw position
output
level
level
within
1dB
1dB
within 1dB
angle of
adjustment
screw
adjustment
screw
4. Enter the FWD mode and perform steps 1 to 3.
5. Check that the phase difference between L-CH and R-CH is in
5. Check that the phase difference between L-CH and R-CH is in
the range of in-phase to 90
°
.
6. After adjustment, lock the screw with locking compound.
Adjustment Location:
Tape Speed Adjustment
Procedure :
Mode : FWD playback
Mode : FWD playback
1. Enter the FWD playback mode, and play back test tape.
2. Adjust the adjustment control (variable resistor) of the motor
2. Adjust the adjustment control (variable resistor) of the motor
(M902) until the frequency counter reading becomes 3,000 Hz
± 90 Hz.
± 90 Hz.
3. Confirm that the tape speed deviation between tape top and tape
end is within 3%.
Adjustment location :
test tape
P-4-A100
(10kHz, –10dB)
set
LINE OUT
47k
Ω
level meter
Record/Playback Head Azimuth Adjustment
Note:
•
Perform this adjustment after the head is turned around.
(If the head is positioned in the FWD direction, turn around
the head and start adjustment from the REV mode as
described below.)
(If the head is positioned in the FWD direction, turn around
the head and start adjustment from the REV mode as
described below.)
* When the azimuth adjustment is performed, the azimuth
adjustment screw must end up with rotation of tightening
direction (i.e. clockwise direction).
direction (i.e. clockwise direction).
Adjustment procedure :
1. Mode: REV playback
1. Mode: REV playback
2. Turn the azimuth adjustment screw for the maximum output
level of L-CH and R-CH.
If the peak levels do not match for L-CH and R-CH, turn the
adjustment screw until both of output levels match together
within 1 dB of peak.
If the peak levels do not match for L-CH and R-CH, turn the
adjustment screw until both of output levels match together
within 1 dB of peak.
3. Phase Check
Mode: REV playback
test tape
P-4-A100
(10kHz, –10dB)
L-CH
R-CH
set
47k
Ω
47k
Ω
oscilloscope
LINE OUT
V
H
Oscilloscope Lissajous waveform
in phase
45
°
90
°
180
°
135
°
Good
Wrong
Adjustment screw (FWD side)
Adjustment screw (REV side)
test tape
WS-48B (3kHz, 0dB)
set
L- or R-CH of LINE OUT
47k
Ω
frequency counter
M902
adjustment control
(variable resistor)
(variable resistor)
Sample Value of Wow and flutter
W. RMS (JIS) within 0.3%
(test tape: WS-48B)
(test tape: WS-48B)
— 31 —
Playback Level Adjustment
Procedure :
1. Mode : FWD playback
1. Mode : FWD playback
Adjust SFR01 (L-CH) and SFR02 (R-CH) so that the reading on
level meter meets the adjustment limits below.
level meter meets the adjustment limits below.
Adjustment Limits :
LINE OUT level : -7.7 ± 0.5 dB (301.5 to 338.5 mV)
Level difference between channels : within 0.5 dB
Check that the LINE OUT level does not change even if Playback
and Stop operations are repeated several times.
Adjustment Location : DOLBY board (Refer to page 32.)
LINE OUT level : -7.7 ± 0.5 dB (301.5 to 338.5 mV)
Level difference between channels : within 0.5 dB
Check that the LINE OUT level does not change even if Playback
and Stop operations are repeated several times.
Adjustment Location : DOLBY board (Refer to page 32.)
Record BIAS Adjustment
Setting :
•
The REC LEVEL control must be positioned at the standard record
level position. (Refer to page 29.)
level position. (Refer to page 29.)
Procedure :
1. Mode: Record
1. Mode: Record
2. Playback
3. Reproduce the portion of tape which is recorded in step 1.
Confirm that the playback level stays within the specified range
of the Adjustment Level.
of the Adjustment Level.
4. If the playback level is outside the specified range, adjust the
SFR03 (L-CH) and SFR04 (R-CH), and repeat steps 1 to 3 until
the specified range is satisfied.
Adjustment Level : Difference of the playback level between
10 kHz and 315 Hz : 0 dB ± 0.5 dB when 315 Hz is the reference.
Adjustment Location : DOLBY board (Refer to page 32.)
the specified range is satisfied.
Adjustment Level : Difference of the playback level between
10 kHz and 315 Hz : 0 dB ± 0.5 dB when 315 Hz is the reference.
Adjustment Location : DOLBY board (Refer to page 32.)
test tape
P-4-L300
(315Hz, 0dB)
set
LINE OUT
level meter
set
AF OSC
attenuator
600
Ω
blank tape
CS-123
LINE IN
1) 315Hz
2) 10kHz
2) 10kHz
50mV (– 23.8dB)
recorded portion
set
LINE OUT
level meter
Record Level Adjustment
Setting :
•
The REC LEVEL control must be positioned at the standard record
level position. (Refer to page 29.)
level position. (Refer to page 29.)
Procedure :
1. Record
1. Record
2. Playback
3. Reproduce the portion of tape which is recorded in step 1.
Confirm that the playback level stays within the specified range
of the Adjustment Level.
of the Adjustment Level.
4. If the playback level is outside the specified range, adjust the
SFR11 (L-CH) and SFR12 (R-CH), and repeat steps 1 to 3 until
the specified range is satisfied.
Adjustment Level : -23.8 dB ± 0.5 dB (47.3 to 53.1 mV)
Adjustment Location : DOLBY board (Refer to page 32.)
the specified range is satisfied.
Adjustment Level : -23.8 dB ± 0.5 dB (47.3 to 53.1 mV)
Adjustment Location : DOLBY board (Refer to page 32.)
315Hz, 50mV (–23.8dB)
set
AF OSC
attenuator
600
Ω
blank tape
CS-123
LINE IN
recorded portion
set
LINE OUT
level meter
— 32 —
SFR01
SFR02
IC01
IC02
SFR03
SFR04
SFR12
SFR11
IC03
IC05
CN13
Adjustment Location:
DOLBY board (Component Side)
CONTROL board (Component Side)
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