Mechanical Adjustments; Electrical Adjustments; Tape Deck Section - Sony CFD-E55 Service Manual

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. 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
FWD CQ-102C
FWD
CQ-102C
Back Tension
FF CQ-201B
REW CQ-201B
• Tape Tension Measurement
Mode Tension Meter
FWD CQ-403A
pinch roller
rubber belts
idlers
Meter Reading
30 – 70 g•cm
(0.42 – 0.97 oz•inch)
1.5 – 5.5 g•cm
(0.021 – 0.076 oz•inch)
more than 60 g•cm
(more than 0.83 oz•inch)
more than 60 g•cm
(more than 0.83 oz•inch)
Meter Reading
more than 100 g
(more than 3.53 oz)

ELECTRICAL ADJUSTMENTS

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.
Specified Value: 2,985 to 3,015 Hz
3. Confirm that the frequency at the beginning and that at the
end of tape winding are between 2,955 to 3,045 Hz.
Adjustment Location:
– TAPE deck block –
Tape speed
Adjustment
– 12 –
SECTION 5
PRECAUTION
0 dB=0.775 V
Signal Used for
3 kHz, 0 dB Tape Speed Adjustment
MAIN board
frequency counter
CNP311 pin 4
3.2 Ω
+
set
–
MAIN board
CNP311 pin 3
CAPSTAN/REEL motor
(M301)