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SECTION 4
MECHANICAL ADJUSTMENTS
ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
1. Specified voltage
swab:
2. Setting
playback head
pinch roller
BL SKIP
rubber belts
capstan
SOUND MB/GRV : OFF
2. Demagnetize the playback head with a head demagnetizer.
AVLS
3. Do not use a magnetized screwdriver for the adjustments.
aNR
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Test tape
5. The adjustments should be performed with the rated power
Type
supply voltage (1.3 V) unless otherwise noted.
WS-48A
Torque Measurement
Mode
Torque meter
Meter reading
Tape Speed Adjustment
Procedure:
18 – 30 g•cm
FWD
(0.25 – 0.41 oz•inch)
CQ-102C
Test tape
FWD
0.7 – 2.0 g•cm
WS-48A
Back Tension
(0.006 – 0.027 oz•inch)
(3 kHz, 0 dB)
18 – 30 g•cm
REV
(0.25 – 0.41 oz•inch)
CQ-102RC
REV
0.7 – 2.0 g•cm
Back Tension
(0.006 – 0.027 oz•inch)
more than 35 g•cm
FF, REW
CQ-201B
(more than 0.49 oz•inch)
1. Playback WS-48A (tape center) in the FWD state.
2. Adjsut RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Values: 2,990 to 3,010 Hz
3. Playback WS-48A (tape center) in the REV state.
Check that the frequency counter reading is within 2.5%
(approx.75 Hz) of the reading of step 1.
Adjustment Point:
– MAIN BOARD (Side B) –
RV601
– 11 –
SECTION 5
PRECAUTION
6-1.
BLOCK DIAGRAM
: 1.3 V (DC)
: OFF
: OFF
HP901
: OFF
(PLAYBACK)
L-CH
Signal
Used for
FWD
3 kHz, 0 dB
Tape Speed Adjustment
R-CH
R-CH
L-CH
REV
frequency counter
R-CH
R-CH
16 Ω
+
set
–
2 REMOTE jack (J701)
BATT B+
S702
(DIRECTION)
FWD
REV
37 36
LED DRIVE
L.DOLBY
8
Q503-2
LED DRIVE
L.AVLS
9
Q707-1
LED DRIVE
L.BLSKIP
11
Q707-2
J701
LED DRIVE
L.MB
34
Q706-1
LED DRIVE
L.GRV 35
Q706-2
PHOTO IN 38
PHOTO CTL 14
PLUNGER
PM CTL
13
DRIVE
Q702, 703
M.BRK
3
M.DIR
2
05
SECTION 6
DIAGRAMS
AUDIO MASTER AMP
IC301
IN L
PRE
FWD
BUF
34
OUT L
IN L
DOLBY NR AMP
NR OUT L
PREAMP
31
18
16
CIRCUIT
33
IN L
BUFFER
EQ
REV
R-CH
MTL
DRV L
METAL
30
MIX AMP
CONTROL
R-CH
+
AMS
R-CH
R-CH
26
22
25
24 19
BLANK SKIP AMS
S901
LEVEL CHANGE SWITCH
(ATS)
Q301-1
33
28 31
15
16
X701
D708
32.768kHz
a NR
D707
AVLS
OUT
11
D706
BL SKIP
D705
M901
ROTATION DETECT
SOUND MB
(CAPSTAN/REEL)
U
SENSOR
B+
19
PH701
V
1
W
D704
3
SOUND GRV
U
W
V
PHOTO REFLECTOR
SWITCH & BUFFER
Q701-1, 709
Q701-2
MOTOR
MOTOR
BRAKE SWITCH
CONTROL SWITCH
Q602-2
Q601, 602-1
PM901
(PLUNGER)
– 12 –
RIPPLE FILTER
B+
BATT B+
Q304
51
52
53
RV301
RIPPLE FILTER
VOLUME
PW IN L
3
MUTING
POWER
R-CH
R-CH
Q305
AMP
LEVEL
PW IN C
46
CONTROL
R-CH
Q302
ADD
ADD
BST
OUT
45
BASS BOOST
BEEP
AMP
AGC
DET
MUTING
MUTE SW
CONTROL
59
SWITCH
Q708
62
50
47
48
60
AVLS CONTROL
SWITCH
Q303-2
MEGABASS/GROOVE
SWITCHING
Q301-2
12
40
41
27
SYSTEM CONTROLLER
IC701
19, 20
10
1
32
24
4
Q712
RESET SWITCH
D703
LED DRIVE
Q704
Q705
BATT
RV601
VOLTAGE DETECT
TAPE SPEED
IC702
THP601
COMPARATOR
IN+
+
10
VSP
–
9
SPEED
7
CONTROL
VREF
BATT B+ (1.5V)
MOTOR
SWITCH &
BIAS
OSC
START
DRIVE
LOGIC
REFERENCE
8
CIRCUIT
B+ (2.5V)
CIRCUIT
CIRCUIT
VOLTAGE
DIRECTION CONTROL
REGULATOR
B+ (2.5V)
CAPSTAN/REEL
PHOTO SENSOR
MOTOR DRIVE
CIRCUIT B+
IC601
6
WM-EX570
• SIGNAL PATH
: PLAYBACK
R-CH: Same as L-CH
J701
2 REMOTE
PW OUT L
+
57
PW OUT R
+
55
PW OUT C
56
BATT B+
VCC
DATA
AVLS
REMO
IN
ALC
63
N.F.
GND
S703
64
58
HOLD
S704 – 708
OFF
HOLD
AVLS ON/OFF
SWITCH
Q303-1
S701
(CASSETTE HOLDER)
BATT B+
43
44
29
30
25
26
42
RESET SIGNAL
GENERATOR
BATT B+
IC703
BATT B+
Q710
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
1PC. 1.5V
D501
SWITCHING
J801
REGULATOR
IC704
Q502-1
DC IN 1.5V
–
+
POWER CONTROL
LOAD CONTROL
CIRCUIT
SWITCH
Q711
Q501, 502-2,
Q503-1, 504
– 13 –
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