Mechanical Adjustments; Electrical Adjustments; Tape Deck Section - Sony CFD-E75L Service Manual

CFD-E75L
SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION
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. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
• Torque Measurement
Mode Torque Meter
FWD CQ-102C
FWD
CQ-102C
Back Tension
FF CQ-201B
REW CQ-201B
• Tape Tension Measurement
Mode Tension Meter
FWD CQ-403A
14
pinch roller
rubber belts
idlers
Meter Reading
2.95 – 6.86 mN•m
(30 – 70 g•cm)
(0.42 – 0.97 oz•inch)
0.15 – 5.39 mN•m
(1.5 – 5.5 g•cm)
(0.021 – 0.076 oz•inch)
more than 5.89 mN•m
(more than 60 g•cm)
(more than 0.83 oz•inch)
more than 5.89 mN•m
(more than 60 g•cm)
(more than 0.83 oz•inch)
Meter Reading
more than 100 g
(more than 3.53 oz)
SECTION 5

ELECTRICAL ADJUSTMENTS

PRECAUTION
1. Setting
MEGA BASS control : OFF

TAPE DECK SECTION

Test tape
Type Signal
WS-48A 3 kHz, 0 dB
Tape Speed Adjustment
Setting:
Function: TAPE
POWER board
Test tape
CNP392 pin 1
WS-48A
(3 kHz, 0 dB)
set
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.
Specified Value: 2,930 to 3,030 Hz
3. Confirm that the frequency at the beginning and that at the
end of tape winding are between 2,940 to 3,060 Hz.
Adjustment Location:
– TAPE deck block –
Tape speed
Adjustment
0 dB=0.775 V
Used for
Tape Speed Adjustment
frequency counter
3.2 Ω
+
–
POWER board
CNP392 pin 2
CAPSTAN/REEL motor
(M301)