– 17 –
Tape Speed Adjustment
Procedure:
Mode: playback
32 Ω
test tape
WS-48B
(3 kHz, 0 dB)
set
i (headphones) jack (J301)
digital frequency
counter
Mode Tension Meter Meter Reading
FWD CQ-403A
more than 100 g
REV CQ-403R
(more than 3.52 oz)
Mode Torque Meter Meter Reading
FWD
CQ-102C
36 – 61 g•cm
(0.50 – 0.89 oz•inch)
FWD 2.0 – 6.0 g•cm
Back tension (0.028 – 0.076 oz•inch)
REV
CQ-102RC
36 – 61 g•cm
(0.50 – 0.89 oz•inch)
REV 2.0 – 6.0 g•cm
Back tension (0.028 – 0.076 oz•inch)
61 – 143 g•cm
FF, REW CQ-201B
(0.89 – 2.00 oz•inch)
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:
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback/erase head pinch roller
rubber belts capstan
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
Tape Tension Measurement
Standard Output Level
Test Tape
5-1. TAPE SECTION 0 dB = 0.775 V
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.
SP OUT PHONES
Load impedance 4 Ω 32 Ω
Output level 0.775 V (0 dB) 0.25 V (–10 dB)
Type Signal Used for
WS-48B 3 kHz, 0 dB Tape speed adjustment
P-4-A100 10 kHz, –10 dB Head azimuth adjustment
Digital frequency counter
2,970 to 3,030 Hz
Adjust so that the value on the frequency counter is 3,000 Hz.
Specification Values:
TC board
M691
TAPE SPEED
Adjustment
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