Read Sony TC-SD1 Service Manual 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
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