Sony WM-FX651 Service Manual page 7

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