Sony XR-CA370 / XR-CA370X Service Manual ▷ View online
XR-CA370/CA370X
9
2-7.
DC MOTOR (CAPSTAN/REEL) (M901)
1
two screws
(P2
(P2
×
2.5)
4
DC motor (capstan/reel)
(M901)
(M901)
3
sub belt (C)
2
main belt
Note : When installing motor,
adjust the screw and
screw hole of motor.
screw hole of motor.
2-8.
MAIN BELT, SUB BELT (C)
1
main belt
4
sub belt (c)
2
screw
(PTP2
(PTP2
×
3)
A
2
screw
(PTP2
(PTP2
×
3)
2
screw
(PTP2
(PTP2
×
3)
2
screw
(PTP2
(PTP2
×
3)
3
Lift up the bottom BKT (TS)
in the direction of arrow
in the direction of arrow
A
(as far as the belt can be removed).
XR-CA370/CA370X
10
2-9.
MAGNETIC HEAD (PLAYBACK) (HP901)
2
screw
(PTT2
(PTT2
×
4)
1
screw
(P2
(P2
×
3)
3
FF/REV lever section
9
screw
(P2
(P2
×
4)
5
screw
(PTP2
(PTP2
×
3)
qd
Remove three magnetic
head lead wires from
the adjuster arm blue.
head lead wires from
the adjuster arm blue.
magnetic head
(HP901)
(HP901)
magnetic head lead wire
adjuster arm blue
• MAGNETIC HEAD LEAD WIRE COLOR INDICATION
ON HEAD (HP901) AND SLIDE SW BOARD.
0
SPG support plate
7
PSW (reel) B
8
HP roller (A)
qa
adjuster arm SPG (A)
qs
adjuster arm SPG (B)
qf
magnetic head (play back)
(HP901)
(HP901)
6
slide SW board
4
Remove the three solders
of magnetic head lead wires.
of magnetic head lead wires.
yellow lead wire
black lead wire
red lead wire
slide SW board
11
XR-CA370/CA370X
SECTION 3
MECHANICAL ADJUSTMENTS
SECTION 4
ELECTRICAL ADJUSTMENTS
Mode
Tension Meter
Meter Reading
Forward
CQ-403A
more than 5.89 mN•m
(more than 60 g)
Reverse
CQ-403R
(more than 2.12 oz)
• TAPE TENSION MEASUREMENT
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
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.
compound to the parts after the azimuth adjustment.
• TORQUE MEASUREMENT
Mode
Torque Meter
Meter Reading
2.46 – 5.39 mN•m
Forward
CQ-102C
(25 – 55 g•cm)
(0.35 – 0.76 oz•inch)
Forward
0.15 – 0.39 mN•m
CQ-102C
(1.5 – 4 g•cm)
Back Tension
(0.02 – 0.06 oz•inch)
2.46 – 5.39 mN•m
Reverse
CQ-102RC
(25 – 55 g•cm)
(0.35 – 0.76 oz•inch)
Reverse
0.15– 0.39 mN•m
CQ-102RC
(1.5 –
4 g•cm)
Back Tension
(0.02 – 0.06 oz•inch)
4.91 – 14.70 mN•m
FF, REW
CQ-201B
(50 – 150 g•cm)
(0.69 – 2.08 oz•inch)
TAPE DECK SECTION
0 dB= 0.775 V
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
PB HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Put the set into the FWD PB mode.
1. Put the set into the FWD PB mode.
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.
within 3 dB.
3. Check the phase in the FWD PB mode.
4. Repeat the above adjustment for the REV PB mode.
5. Check that output level difference between FWD 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 12)
Type
Signal
Used for
P-4-A063
6.3 kHz, –10 dB
head azimuth adjustment
WS-48A
3 kHz, 0 dB
tape speed adjustment
level
meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
set
speaker out terminal
4
Ω
+
–
–
screw
position
position
L-CH
peak
peak
within
3 dB
3 dB
output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
3 dB
3 dB
angle
R-CH
peak
peak
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
L-CH
R-CH
speaker out terminal
oscilloscope
V
H
+ +
–
–
Screen pattern
in phase
good
wrong
45
°
90
°
135
°
180
°
4
Ω
4
Ω
set
12
XR-CA370/CA370X
frequency counter
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
set
speaker out terminal
–
+
4
Ω
FWD
REV
adjustment
screws
screws
– Set Upper View –
TAPE SPEED ADJUSTMENT
Setting:
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
reading on the frequency counter becomes in 3,015 Hz.
Specified Value: 2,940 to 3,090 Hz
Adjustment Location: DC motor
TUNER SECTION
Tuner section adjustments are done automatically in this set.
Adjustment Location: PB head
Adjustment Location: DC motor
– Set Upper View –
Tape Speed Adjustment
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