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SECTION 4
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback/erase head
rubber belts
idlers
2. Demagnetize the record/playback/erase head with a head de-
magnetizer. (Do not bring the head demagnetizer close to the
erase head portion.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
Torque Measurement
Mode
Torque Meter
FWD
CQ-102C
FWD
Back tension
REV
CQ-102RC
REV
Back tension
FF, REW
CQ-201B
Tape Tension Measurement
Mode
Tension Meter
FWD
CQ-403A
REV
CQ-403R
pinch roller
capstan
Meter Reading
36 – 61 g•cm
(0.50 – 0.89 oz•inch)
2.0 – 6.0 g•cm
(0.028 – 0.076 oz•inch)
36 – 61 g•cm
(0.50 – 0.89 oz•inch)
2.0 – 6.0 g•cm
(0.028 – 0.076 oz•inch)
61 – 143 g•cm
(0.89 – 2.00 oz•inch)
Meter Reading
more than 100 g
(more than 3.52 oz)
– 17 –
SECTION 5
ELECTRICAL ADJUSTMENTS
5-1. TAPE SECTION
1. The adjustments should be performed in the order given in the
service manual. (As a general rule. Playback circuit adjustment
should be completed before performing recording circuit ad-
justment.)
2. The adjustments should be performed for both L-ch and R-ch
unless otherwise indicated.
Standard Output Level
SP OUT
4 Ω
Load impedance
Output level
0.775 V (0 dB)
Test Tape
Type
Signal
WS-48B
3 kHz, 0 dB
P-4-A100
10 kHz, –10 dB
Tape Speed Adjustment
Procedure:
Mode: playback
test tape
WS-48B
(3 kHz, 0 dB)
set
Adjust so that the value on the frequency counter is 3,000 Hz.
Specification Values:
Digital frequency counter
2,970 to 3,030 Hz
Adjust so that the frequency at the beginning and that at the end of
tape winding are between 2,970 and 3,030 Hz.
Adjustment Location:
0 dB = 0.775 V
PHONES
32 Ω
0.25 V (–10 dB)
Used for
Tape speed adjustment
Head azimuth adjustment
digital frequency
counter
32 Ω
i (headphones) jack (J301)
TC board
M691
TAPE SPEED
Adjustment
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