CFD-S28L - Sony Audio Service Manual (repair manual). Page 13

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SECTION  4
MECHANICAL  ADJUSTMENTS
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 100 g
(more than 3.53 oz)
• Tape Tension  Measurement
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head magnetizer close to the erase head.)
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
supply voltage unless otherwise noted.
• Torque Measurement
Mode
Torque Meter
Meter Reading
FWD
CQ-102C
30 – 70 g•cm
(0.42 – 0.97 oz•inch)
FWD
CQ-102C
1.5 – 5.5 g•cm
Back Tension
(0.021 – 0.076 oz•inch)
FF
CQ-201B
more than 60 g•cm
(more than 0.83 oz•inch)
REW
CQ-201B
more than 60 g•cm
(more than 0.83 oz•inch)
SECTION  5
ELECTRICAL  ADJUSTMENTS
Tape Speed Adjustment

Setting:
Function: TAPE

Procedure:
1. Playback WS-48A (tape center) in the FWD state.
2. Adjsut the volume in CAPSTAN/REEL motor (M301) so that
the frequency counter reading becomes 3,000 Hz.

Specification Values: 2,985 to 3,015 Hz
3. Adjust the volume in CAPSTAN/REEL motor (M301) so that
the frequency at the beginning and that at the end of tape wind-
ing are between 2,955 to 3,045 Hz.
Adjustment Location:
PRECAUTION
1. Setting
SOUND control : OFF
TAPE  DECK  SECTION
0 dB=0.775 V
Test tape
Type
Signal
Used for
WS-48A
3 kHz, 0 dB
Tape Speed Adjustment
+
–
set
Test tape
WS-48A
(3 kHz, 0 dB)
frequency counter
32 
Ω
2
 jack (J301)
– TAPE deck block –
CAPSTAN /REEL motor
(M301)
Tape Speed 
Adjustment
Display
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