Sony CFD-E90 - ADJUSTMENTS; Mechanical Adjustments; Electrical Adjustments

15
CFD-E90
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
TAPE SPEED ADJUSTMENT
Setting:
Function: TAPE
Procedure:
1. Playback WS-48B (tape center) in the FWD state.
2. Adjsut the volume in CAPSTAN/REEL motor (M901) so that
the frequency counter reading becomes 3,000 Hz.
Specified Value: 2,910 to 3,090 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:
PRECAUTION
1. Setting
MEGABASS control : OFF
TAPE DECK SECTION 0 dB=0.775 V
Test tape
Type Signal Used for
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
+
–
set
Test tape
WS-48B
(3 kHz, 0 dB)
frequency counter
3.2
Ω
RELAY board
CN325 pin
2
RELAY board
CN325 pin
1
Tape speed
Adjustment
CAPSTAN/REEL motor
(M901)
– TAPE deck block –
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. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
•Torque Measurement
Mode Torque Meter Meter Reading
2.95 – 6.86 mN•m
FWD CQ-102C (30 – 70 g•cm)
(0.42 – 0.97 oz•inch)
0.15 – 5.39 mN•m
FWD
CQ-102C (1.5 – 5.5 g•cm)
Back Tension
(0.021 – 0.076 oz•inch)
more than 5.89 mN•m
FF CQ-201B (more than 60 g•cm)
(more than 0.83 oz•inch)
more than 5.89 mN•m
REW CQ-201B (more than 60 g•cm)
(more than 0.83 oz•inch)