Mechanical Adjustments; Electrical Adjustments; Tape Deck Section - Sony CFD-S28L Service Manual

QQ

MECHANICAL ADJUSTMENTS

3 7 63 1515 0
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
erase head
capstan
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
FWD
FWD
Back Tension
FF
REW
• Tape Tension Measurement
Mode
FWD
TE
L 13942296513
www
.
http://www.xiaoyu163.com
SECTION 4
PRECAUTION
pinch roller
rubber belts
idlers
Torque Meter Meter Reading
30 – 70 g•cm
CQ-102C
(0.42 – 0.97 oz•inch)
1.5 – 5.5 g•cm
CQ-102C
(0.021 – 0.076 oz•inch)
more than 60 g•cm
CQ-201B
(more than 0.83 oz•inch)
more than 60 g•cm
CQ-201B
(more than 0.83 oz•inch)
Tension Meter Meter Reading
more than 100 g
CQ-403A
(more than 3.53 oz)
x ao
y
i
http://www.xiaoyu163.com

ELECTRICAL ADJUSTMENTS

8
1. Setting
SOUND control : OFF

TAPE DECK SECTION

Test tape
Type
WS-48A
Tape Speed Adjustment
Setting:
Function: TAPE
Test tape
WS-48A
(3 kHz, 0 dB)
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-
Q Q
ing are between 2,955 to 3,045 Hz.
3 6 7 1 3
Adjustment Location:
– TAPE deck block –
Tape Speed
Adjustment
u163
.
– 13 –
SECTION 5
2 9 9 4 2 8
PRECAUTION
0 dB=0.775 V
Signal
3 kHz, 0 dB Tape Speed Adjustment
frequency counter
32 Ω
set
2 jack (J301)
1 5 0 5 8 2 9 9 4
CAPSTAN /REEL motor
(M301)
m
co
9 9
Used for
+
–
2 8 9 9