Adjustments; Mechanical Adjustment; Electrical Adjustment; Tape Deck Section - Sony CFD-Z125 Service Manual

5-1.

MECHANICAL ADJUSTMENT

PRECAUTION
1. Clean the following parts with a denatured-alchool-moistened
swab:
record/playback head
erase head
capstans
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer 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 adjustment should be performed with the rated power supply
voltage unless otherwise noted.
Torque Measurement
Mode Torque Meter
FWD
CQ-102C
FWD
back tension
FF
CQ-201B
REW
Tape Tension Measurement
Mode Tension Meter
FWD CQ-403A
SECTION 5

ADJUSTMENTS

pinch roller
rubber belts
idlers
Meter Reading
30 – 70 g•cm
(0.42 – 0. 97 oz•inch)
1 – 6 g•cm
(0.014 – 0.084 oz•inch)
more than 55 g•cm
(more than 0.76 oz•inch)
more than 55 g•cm
(more than 0.76 oz•inch)
Meter Reading
more than 80g
(more than 1.12 oz•inch)
— 16 —
5-2.

ELECTRICAL ADJUSTMENT

TAPE DECK SECTION

1. The adjustments should be perfomed in the order given in the
service manual. (As a general rule. Playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
2. The adjustment should be performed for both L-ch and R-ch
unless otherwise indicated.
•
Switch Location
FUNCTION switch ........................................................ TAPE
VOLUME switch ..................................................... maximum
Standard output level
SP OUT
Load impedance
Output level 0.775 V (0dB)
Test tape
Type Signal
P-4-A063 6.3kHz, –10dB
Record/Playback Head Azimuth Adjustment
Procedure :
1. Mode : Playback
test tape
P-4-A063
(6.3kHz, –10dB)
set
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1dB.
L-CH
peak
within
output
1dB
level
R-CH
peak
Screw
position
0 dB = 0.775V
PHONES
32 Ω 32 Ω
0.25 V (–10dB)
Used for
Head azimuth adjustment.
level meter
3.2 Ω
+
–
SPEAKER terminal (JK302)
within
1dB
screw angle
L-CH R-CH
peak peak