Sony Walkman WM-FX551, Service Manual

Page: 7 / 24

SECTION 4
MECHANICAL ADJUSTMENT
PRECAUTION
1. Clean the following parts with a denatured-alcahol-moistened
sweb :
Playback head
Pinch roller
Rubber belt Capstan
2. Demagnetize the playback head using a demagnetizer.
3. Do not use a magnetized screwdriver for adjustments.
4. After adjusting, apply screw-locking compound onto the
adjusted parts.
5. Unless specified otherwise, use a specified voltage (1.3V) to
perform the adjustments.
Torqu Measurement
Mode
FWD
FWD
Back Tension
REV
REV
Back Tension
FF
REW
Torqu meter
CQ-102C
CQ-102RC
CQ-201B
Meter reading
20 - 30 g · cm
0.4 - 2.0 g · cm
20 - 30 g · cm
0.4 - 2.0 g · cm
More than 40 g · cm
SECTION 5
ELECTRICAL ADJUSTMENT
PRECAUTION
1. Specified voltage : 1.3V
2. Switch position
DOLBY NR switch
: OFF
AVLS switch : OFF
CASSETTE SECTION
Test Tape
Tape Speed Adjustmnet
Procedure :
1. Playback WS-48A (Tape center part) in the FWD state and
adjust RV601 so that the frequency counter reading becomes
3,000Hz
±
30Hz.
2. Playback WS-48A (Tape center) in the REV state.
Check that frequency counter reading is within 2.0% of the
reading of step1.
Adjustment Point :
[MAIN BOARD] — SIDE A —
TUNER SECTION
[AM]
BAND switch : AM
[FM]
BAND switch : FM
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 621kHz
CT1 1,395kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 10.7MHz
( ) : Saudi Arabia model
FM VOLTAGE ADJUSTMENT
1.1 V
±
0.05 V (3.6V
±
0.05V)
L2 76MHz (87.5MHz)
FM VCO Adjustment
Procedure :
1. Connect the frequency counter to the positions shown below.
2. Turn the set to 98MHz.
3. Adjust RV1 for 19kHz
±
100Hz reading on the frequency
counter.
Adjustment Parts Location :
[TUNER BOARD] — SIDE A —
Type
WS-48A
Signal
3kHz, 0dB
Purpose
Tape Speed Adjustment
SECTION 6
EXPLANATION OF IC TERMINALS
— 7 — — 8 — — 9 — — 10 —
Test tape
WS-48A
(3kHz, 0dB)
Set
16 Ω
PHONES jack
+
–
Frequency counter
RV601 : Tape speed
AM RF signal
generator
30% amplitude modulation
by 400Hz signal.
Output level : as low as possible
Put the lead-wire antenna
close to the set.
Set
32
Ω
PHONES
+
–
FM RF signal
generator
22.5kHz frequency
deviation by 400Hz signal.
Output level : as low as possible.
0.01 µ F
to ANT (TP1)
Level meter
FM RF signal
generator
Carrier frequency : 98MHz
Modulation : No moduration
Output level : 0.1V (100dB)
0.01
µ
F
to ANT (TP1)
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
I/O
O
O
O
O
O
O
O
I
I
I
I
I
O
I
O
I
I
I
I
O
O
I/O
O
O
Description
Common terminal.
Common terminal.
Common terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Segment output terminal.
Remote control data output.
DDC control terminal (when DDC ON = L).
BAND control output (when AM = Hi-imp, when FM = L).
MUTE control terminal (when MUTE ON = L).
HEAD select terminal (when FWD = Hi-imp, when REV = L).
Tone control terminal (when BOOST ON = Hi-imp, when OFF = L).
IF REQ control terminal (when REQ = Hi-imp).
HOLDER detect input (when HOLDER CLOSE = H).
Communication request from the remote controller. (H = VCC).
HOLDER detect and TAPE error erase detect terminal.
TAPE rotating direction detect terminal.
Input when the key is pressed during HOLD (H = AD Vref).
Terminal for controlling the rotation detect circuit.
Rotation detect input.
AMS sensitivity select (when AMS = H, when BL.SKIP = L).
Tape sound existing or not-exiting detect (Music
exists: L, music does not exist: H.
Voltage detect input.
KEY input terminal.
Reference voltage of AD IN 1, 2.
LED output terminal.
E 2 PROM CS control terminal.
E 2 PROM DATA I/O.
E 2 PROM CLOCK terminal.
BEEP (when TC : 1.6 kHz, when CF : 3.0 kHz).
Function
COM 1
COM 2
COM 3
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
R DATA OUT
DDC1 CTL
BAND AM/FM
MUTE CTL
F/R CTL
BST CTL
IF REQ
HOLD SW
R DATA IN
HOLDER, TUME
F/R SW
HOLD SENS
PHOTO CTL
PHOTO IN
AMS CTL
AMS IN
BATT DET
KEY IN
AD Vref
LED CTL
CS
M DATA I/O
M CLOCK
BEEP
Circuit
Output
Output (Nch)
Output (Nch)
Output (Nch)
Output (Nch)
Output (Nch)
Output (Nch)
Input
Input
Input
Input
Input
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Remarks
VLD at High level.
Pull-up at outside
(TUNER side).
Pull-up at outside (Vref).
Pull-up at outside (Vcc).
Pull-up at outside (Vcc).
Pull-up at outside (Vcc).
Pull-up at outside (Vref).
Pull-up at outside (V
LCD
).
A/D input.
A/D input.
A/D input.
A/D input.
Pull-down at outside.
Pull-up at outside.
Pin Name
COM 1
COM 2
COM 3
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
P13-1
P13-2
P13-3
P14-0
P14-1
P14-2
P14-3
IN2
K0
K1
K2
K3
P1-1
P1-2
P1-3
P2-0/AD IN1
P2-1/AD IN2
P2-2
P2-3
P3-0
P3-1
P3-2
P3-3/BUZR
P4-0
INT
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
H
Hi-imp
Hi-imp
Hi-imp
Hi-imp
L
Hi-imp
—
L
—
—
L
L
—
L
—
—
H
—
L
L
L
L
—
ACT
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
L
—
L
—
Hi-imp
L
—
VCC
—
—
AD Vrcl
H
—
H
—
—
—
—
H
—
—
—
—
Pin No.
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
I/O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
Description
MOTOR control terminal.
MOTOR control terminal.
MOTOR control terminal.
REC circuit control output.
RADIO system control terminal (when RADIO ON = L).
Terminal for controlling AVLS (when ON = L).
AMP control output (when AMP ON = H).
Tone control terminal (when GRV = L, when MB = H).
PL control terminal.
TC/CF select output (when PRE OFF = H, when PRE ON = Hi-imp).
Terminal for controlling DOLBY circuit
(when OFF = H, when ON = Hi-imp).
DDC control terminal (ON at Hi-imp, OFF at L).
TUNER MONO/STEREO select terminal (MONO at H).
TEST terminal (Normal operation at L or NC).
IF input.
TUNER sensitivity select terminal (LOCAL at H, DX at L).
Phase comparator output.
External interrupt terminal.
Pre-scaler output (FM at H).
Power supply GND terminal.
Pre-scaler input.
AM local oscillator output.
Power supply voltage.
RESET terminal (H during operation).
Terminal to which external oscillator is connected.
Terminal to which external oscillator is connected.
Terminal to which external capacitor is connected
to stabilize crystal oscillator power supply.
Terminal to step-up power supply voltage for LCD drive.
Terminal to step-up power supply voltage for LCD drive.
Terminal to step-up power supply voltage for LCD drive.
Terminal for 1.5 V constant voltage power supply of LCD drive.
Function
MOTOR CTL
MOTOR DIR
MOTOR BRK
REC CTL
RADIO CTL
AVLS CTL
AMP CTL
GRV/MB CTL
PM CTL
PRE AMP CTL
DOLBY CTL
DDC2 CTL
MONO/ST
TEST
IF IN
LOCAL/DX
DO
HOLD
PSC
GND
FM IN
AM IN
VDD
RESET
XOUT
XIN
VXT
VLCD
C1
C2
VEE
Circuit
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Ternary output
Ternary output
Ternary output
Ternary output
Output
Output
External interrupt
Remarks
Open
Pin Name
P4-1
P4-1
P4-2
P4-3
P5-0
P5-1
P5-2
P5-3
P6-0
P6-1
P6-2
P6-3
MUTE
TEST
IF IN
DO1/OT
DO2
HOLD
PSC
GND
FM IN
AM IN
VDD
RESET
XOUT
XIN
VXT
VLCD
C1
C2
VEE
INT
L
L
L
L
H
L
L
L
L
Hi-imp
Hi-imp
Hi-imp
L
—
—
L
—
H
—
—
—
—
—
L
—
—
—
—
—
—
—
ACT
H
H
H
H
L
L
H
H
H
Hi-imp
Hi-imp
Hi-imp
—
—
—
—
—
—
H
—
—
—
—
H
—
—
—
—
—
—
—
100
Ω
+
–
Frequency counter
1
µ
F
TP23
(IC7 pin !“ )
IC7 pin 9
• IC1 TC9326F
L3 : FM IF Adjustment
TP1
TP13
L2 : FM VT
Voltage Adjustment
RV1 : FM VCO Adjustment
L4 : AM Tracking
Adjustment
CT1 : AM Tracking
Adjustment