Mechanical Adjustments; Electrical Adjustments; Tape Deck Section - Sony XR-CA350X Service Manual

XR-CA350X
SECTION 3

MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head pinch roller
rubber belt capstan
idler
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the power supply
voltage (14.4 V) unless otherwise noted.
Note: With this set, it is not necessary to apply suitable locking
compound to the parts after the azimuth adjustment.
• TORQUE MEASUREMENT
Mode Torque Meter
Forward CQ-102C
Forward
CQ-102C
Back Tension
Reverse CQ-102RC
Reverse
CQ-102RC
Back Tension
FF, REW CQ-201B
• TAPE TENSION MEASUREMENT
Mode Tension Meter
Forward CQ-403A
Reverse CQ-403R
12
Meter Reading
2.46 – 5.39 mN•m
(25 – 55 g•cm)
(0.35 – 0.76 oz•inch)
0.15 – 0.39 mN•m
(1.5 – 4 g•cm)
(0.02 – 0.06 oz•inch)
2.46 – 5.39 mN•m
(25 – 55 g•cm)
(0.35 – 0.76 oz•inch)
0.15– 0.39 mN•m
(1.5 – 4 g•cm)
(0.02 – 0.06 oz•inch)
4.91 – 14.70 mN•m
(50 – 150 g•cm)
(0.69 – 2.08 oz•inch)
Meter Reading
more than 5.89 mN•m
(more than 60 g)
(more than 2.12 oz)
SECTION 4

ELECTRICAL ADJUSTMENTS

TAPE DECK SECTION

1. The adjustments should be performed in the order given in
this service manual.
2. The adjustments should be performed for both L-CH and
R-CH.
TEST TAPE
Type Signal
P-4-A063 6.3 kHz, –10 dB
WS-48A 3 kHz, 0 dB
PB HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Put the set into the FWD PB mode.
test tape
P-4-A063
(6.3 kHz, –10 dB)
set
speaker out terminal
2. Turn the screw and check the output peak value. Adjust the
screw so that the peak value in channels L and R coincides
within 3 dB.
L-CH
peak
output
level
R-CH
peak
screw
position
3. Check the phase in the FWD PB mode.
test tape
P-4-A063
(6.3 kHz, –10 dB)
4 Ω
L-CH
set
R-CH
4 Ω
speaker out terminal
Screen pattern
in phase
45 °
good
4. Repeat the above adjustment for the REV PB mode.
5. Check that output level difference between FWD PB mode
and REV PB mode is within 4 dB.
Adjustment Location: PB head (See page 13)
0 dB= 0.775 V
Used for
head azimuth adjustment
tape speed adjustment
level
meter
4 Ω
+
–
within
3 dB
within
3 dB
angle
L-CH
R-CH
peak peak
oscilloscope
V
H
+ +
– –
90 ° 135 ° 180 °
wrong