WM-EX570
– 11 –
– 12 –
– 13 –
6-1.
BLOCK DIAGRAM
SECTION 6
DIAGRAMS
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head
pinch roller
rubber belts
capstan
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage (1.3 V) unless otherwise noted.
Torque Measurement
Mode
Torque meter
Meter reading
FWD
18 – 30 g•cm
CQ-102C
(0.25 – 0.41 oz•inch)
FWD
0.7 – 2.0 g•cm
Back Tension
(0.006 – 0.027 oz•inch)
REV
18 – 30 g•cm
CQ-102RC
(0.25 – 0.41 oz•inch)
REV
0.7 – 2.0 g•cm
Back Tension
(0.006 – 0.027 oz•inch)
FF, REW
CQ-201B
more than 35 g•cm
(more than 0.49 oz•inch)
Tape Speed Adjustment
Procedure:
PRECAUTION
1. Specified voltage
: 1.3 V (DC)
2. Setting
BL SKIP
: OFF
SOUND MB/GRV : OFF
AVLS
: OFF
a
NR
: OFF
Test tape
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) –
+
–
set
Test tape
WS-48A
(3 kHz, 0 dB)
frequency counter
16
Ω
2
REMOTE jack (J701)
Type
Signal
Used for
WS-48A
3 kHz, 0 dB
Tape Speed Adjustment
J701
RV601
+
–
PREAMP
AGC
DET
BEEP
ALC
EQ
METAL
CONTROL
SPEED
CONTROL
DIRECTION CONTROL
LED DRIVE
Q503-2
PHOTO REFLECTOR
SWITCH & BUFFER
Q701-1, 709
PLUNGER
DRIVE
Q702, 703
MUTING
CONTROL
SWITCH
Q708
LEVEL
CONTROL
Q302
MUTING
Q305
RIPPLE FILTER
Q304
RIPPLE FILTER
RESET SWITCH
Q704
RESET SIGNAL
GENERATOR
IC703
REGULATOR
IC704
MOTOR
CONTROL SWITCH
Q601, 602-1
MOTOR
BRAKE SWITCH
Q602-2
ROTATION DETECT
SENSOR
PH701
CAPSTAN/REEL
MOTOR DRIVE
IC601
SYSTEM CONTROLLER
IC701
S704 – 708
S701
(CASSETTE HOLDER)
M901
(CAPSTAN/REEL)
HP901
(PLAYBACK)
AUDIO MASTER AMP
IC301
•
SIGNAL PATH
: PLAYBACK
R-CH: Same as L-CH
MOTOR
DRIVE
CIRCUIT
SWITCH &
LOGIC
CIRCUIT
BIAS
REFERENCE
VOLTAGE
OSC
CIRCUIT
LED DRIVE
Q707-1
LED DRIVE
Q707-2
LED DRIVE
Q705
LED DRIVE
Q706-1
LED DRIVE
Q706-2
DOLBY NR AMP
CIRCUIT
AMS
MEGABASS/GROOVE
SWITCHING
Q301-2
N.F.
AVLS CONTROL
SWITCH
Q303-2
SWITCHING
REGULATOR
Q502-1
POWER CONTROL
CIRCUIT
Q501, 502-2,
Q503-1, 504
DRY BATTERY
SIZE “AA”
(IEC DESIGNATION R6)
1PC. 1.5V
LOAD CONTROL
SWITCH
Q711
BATT B+ (1.5V)
D501
BATT B+
Q710
VOLTAGE DETECT
IC702
BATT B+
B+ (2.5V)
B+ (2.5V)
X701
32.768kHz
THP601
TAPE SPEED
RV601
START
VREF
IN+
COMPARATOR
VSP
OUT
05
VCC
DATA
REMO
GND
BATT B+
BATT B+
BATT B+
B+
BASE
PW OUT L
PW OUT R
PW OUT C
AVLS
IN
POWER
AMP
BASS BOOST
AMP
PW IN L
VOLUME
RV301
HOLD
S703
2
REMOTE
J701
BUF
IN L
NR OUT L
S901
(ATS)
PRE
OUT L
MTL
DRV L
IN L
FWD
IN L
REV
L-CH
R-CH
FWD
L-CH
R-CH
REV
R-CH
BLANK SKIP AMS
LEVEL CHANGE SWITCH
Q301-1
AVLS ON/OFF
SWITCH
Q303-1
R-CH
ADD
ADD
R-CH
R-CH
R-CH
S702
(DIRECTION)
BATT B+
R-CH
R-CH
R-CH
R-CH
BUFFER
MIX AMP
F/R SW
PRE SW
DET1
AMS OUT
4
8
7
DR
6
10
9
11
W
3
V
1
U
W
V
U
19
XTB
15
XT
16
M.BRK
3
34
L.DOLBY
L.AVLS
8
L.BLSKIP
9
52
PW VCC
53
RF OUT
51
57
55
56
63
BST SW
62
AGC
IN
BST
IN
50
BEEP IN
60
3
PW IN C
BST
OUT
MUTE SW
46
45
59
18
16
31
30
22
26
F/R CTL
33
REV SW
37
FWD SW
36
AMS IN
28
DOLBY CTL
31
MUTE CTL
12
MB/GRV
CTL
41
BOOST CTL
40
M.CTL
1
L.BA
TT
10
VCM
•
VCP
BEEP
27
A
VLS OUT
PW SW
64
A
VLS CTL
43
58
AMP CTL
44
D
ATA
30
RMUM
29
HOLDER SW
26
KEY IN
25
34
33
25
24
NR SW
19
47
ADD OUT
48
+
+
+
FWD
REV
OFF
HOLD
D703
BATT
D708
a
NR
D707
AVLS
D706
BL SKIP
L.MB
11
L.GRV 35
PHOTO IN 38
PHOTO CTL 14
PM CTL
PM901
(PLUNGER)
Q701-2
13
M.DIR
2
B+
D705
SOUND MB
D704
SOUND GRV
SET STOP2
24
DDC CTL
32
LOAD CTL
42
RESET
Q712
19, 20
PHOTO SENSOR
CIRCUIT B+
J801
DC IN 1.5V
–
+
