Sony XR-CA640X Service Manual ▷ View online
13
XR-CA640X
3-6.
GUIDE (C)
2
guide (C)
1
three claws
3-5.
GEAR (LDG-FT)
gear (LDG-D)
5
gear (LDG-FT)
6
polyethylene washer
2
tension spring (LD-2)
2
tension spring (LD-1)
gear (LDG-FB)
lever (LDG-A)
hole
hole
4
Align hole in the gear (LDG-D)
with hole the lever (LDG-A).
with hole the lever (LDG-A).
3
Move the lever (LDG-B)
in the arrow direction.
in the arrow direction.
1
14
XR-CA640X
3-7.
MOUNTING POSITION OF CAPSTAN/REEL MOTOR (M901)
two precision screws
(P2
(P2
×
2)
Note: Mount the motor so that the
angle between of the
motor and the hole for the
screw becomes 30
motor and the hole for the
screw becomes 30
°
as
shown in this figure.
capstan/reel motor
(M901)
(M901)
30˚
15
XR-CA640X
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 3,000 Hz.
Specification: Constant speed
Adjustment Location:
Tape Speed Adjustment
– SET UPPER VIEW –
SECTION 4
MECHANICAL ADJUSTMENTS
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.
TORQUE MEASUREMENT
Mode
Torque Meter
Meter Reading
2.95 – 6.37 mN•m
Forward
CQ-102C
(30 – 65 g•cm)
(0.42 – 0.90 oz•inch)
Forward
0.05 – 0.44 mN•m
CQ-102C
(0.5 – 4.5g•cm)
Back Tension
(0.01 – 0.06 oz•inch)
2.95 – 6.37 mN•m
Reverse
CQ-102RC
(30 – 65 g•cm)
(0.42 – 0.90 oz•inch)
Reverse
0.05 – 0.44 mN•m
CQ-102RC
(0.5 – 4.5g•cm)
Back Tension
(0.01 – 0.06 oz•inch)
5.89 – 19.61 mN•m
FF, REW
CQ-201B
(60 – 200 g•cm)
(0.83 – 2.78 oz•inch)
Mode
Tension Meter
Meter Reading
Forward
CQ-403A
more than 60 g
(more than 2.12 oz)
Reverse
CQ-403R
more than 60 g
(more than 2.12 oz)
SECTION 5
ELECTRICAL ADJUSTMENTS
0 dB=0.775 V
TAPE SPEED ADJUSTMENT
Setting:
Frequency counter
2,955 to 3,075 Hz
TAPE DECK SECTION
frequency counter
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
set
AUDIO OUT REAR jack (CNJ151)
–
+
10 k
Ω
TUNER SECTION
Tuner section adjustments are done automatically in this set.
XR-CA640X
17
17
1
2
FM-ANT
AM-ANT
2
VSM
AMSIN
14
S-METER
10
MPX
8
AM-DET
FM/AM TUNER UNIT
TU1
SYSTEM CONTROLLER
IC501 (1/3)
17
SDA-EEP
J1
(FM/AM ANTENNA IN)
5
VCC
TU +8V
16
VDD
TU +5V
11
EEP VDD
74
SDA, SCL
MPX
A
AM
B
LEVEL
E
BACKUP +5V
EEP-SIO
18
SCL-EEP
EEP-CKO
SDA
SCL
7
SW SHIFT
77
SWSHIFT
SDA
12 13
SCL
D
TAPE EQUALIZER AMP,
DOLBY NR AMP
IC301
37
39
R-CH
PBF
IN2
IN2
PBFB2
FWD
L-CH
HP901
(PLAYBACK)
FWD
R-CH
REV
L-CH
REV
R-CH
PBR
IN2
IN2
R-CH
R-CH
R-CH
R-CH
R-CH
R-CH
EQ AMP
2
4
MUTE
DOLBY
NR AMP
PB
OUT2
TAPE
IN2
IN2
AMS
DET
+
19
DRSW
18
TAPESW
20
INSW
DOLBY
MSMODE
7
LINE
OUT2
14
MS
OUT
TAPE L
C
• SIGNAL PATH
: AM
: FM
: TAPE PLAY
REGULATOR
CONTROL SWITCH
Q352
CAPSTAN/REEL
MOTOR DRIVE
Q353, 354
TAPON
CMON
VCC
REEL SENSOR B+
BATT B+
BATT B+
IN1
IN2
OUT1
OUT2
LOADING
MOTOR DRIVE
IC351
92
M
M
M901
(CAPSTAN/REEL)
9
7
MOTOR
DRIVE
3
4
1
LMLOD
89
LMEJ
90
+9V REGULATOR
Q351
91
(LOADING)
TAPE OPERATION
SWITCH
BUFFER
TAKE-UP
REEL
SENSOR
SUPPLY
REEL
SENSOR
REEL SENSOR BOARD
REL
84
87, 88, 86, 85
POS0 – POS3
TAPE
DETECT
EJECT/FF/REW/
REV/FWD MODE DETECT
75
57
AMSON
52
DOLON
MTLON
54
F/ROUT
53
16
17
D1
TAPATT
55
56
40
DOLBY LEVEL (L)
RV101
(Page 18)
(Page 18)
(Page 18)
(Page 18)
(Page 18)
• R-ch is omitted due to same as L-ch.
9
DESTSEL
BACKUP +5V
10k (200k) 9k (50k)
S501
FREQUENCY
SELECT
(E)
SECTION 6
DIAGRAMS
6-1.
BLOCK DIAGRAM – TUNER/TAPE Section –
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