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WM-FX271/FX275
SERVICE MANUAL US Model
WM-FX271/FX275
Ver 1.0 1999. 02 Canadian Model
AEP Model
E Model
Chinese Model
WM-FX271
Photo: WM-FX271
Model Name Using Similar Mechanism WM-FX171
Tape Transport Mechanism Type MF-WMFX171-114
SPECIFICATIONS
Frequency range
FM: 65 74/87.5 108 MHz (East European)
87.5 108 MHz (Except East European)
AM: 530 1,710 kHz (US, Canadian)
531 1,602 kHz (Except US, Canadian)
Power requirements
3 V DC batteries R6 (AA) × 2/External DC 3 V power sources
Dimensions
91.4 × 115.5 × 35.9 mm (3 5/8 × 4 5/8 × 1 7/16 inches) (w/h/d) incl.
projecting parts and controls
Mass
Approx. 150 g (5.3 oz.)
Approx. 230 g (8.2 oz.) incl.batteries and a tape
Supplied accessories
Stereo headphones or Stereo earphones (1)/Carrying case (1)
Design and specifications are subject to change without
notice.
Notes on Chip Component Replacement
· Never reuse a disconnected chip component.
· Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
· Keep the temperature of the soldering iron around 270°C during
repairing.
· Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
· Be careful not to apply force on the conductor when soldering
or unsoldering.
RADIO CASSETTE PLAYER
MICROFILM
1
TABLE OF CONTENTS
1. GENERAL ........................................................................... 3
2. DISASSEMBLY
2-1. Cabinet (Front) Sub Assy .................................................... 4
2-2. Main Board ......................................................................... 5
2-3. Holder (Sub) Assy, Cassette ................................................ 5
2-4. Mechanism Deck ................................................................. 6
2-5. Belt and Motor .................................................................... 6
3. MECHANICAL ADJUSTMENTS ................................. 7
4. ELECTRICAL ADJUSTMENTS
Tape Section ............................................................................ 7
Tuner Section ........................................................................... 8
5. DIAGRAMS
5-1. IC Pin Description ............................................................. 10
5-2. Block Diagram .................................................................. 11
5-3. Printed Wiring Board ........................................................ 13
5-4. Schematic Diagram ........................................................... 15
6. EXPLODED VIEWS
6-1. Cabinet Section ................................................................. 18
6-2. Tape Mechanism Section-1 ............................................... 19
6-3. Tape Mechanism Section-2 ............................................... 20
7. ELECTRICAL PARTS LIST ........................................ 21
2
SECTION 1
GENERAL This section is extracted
from instruction manual.
3
SECTION 2
DISASSEMBLY
· The equipment can be removed using the following procedure.
Set Cabinet (front) sub assy Main board Holder (sub) assy, cassette Belt and Motor
Mechanism deck
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (FRONT) SUB ASSY
Note : When installing, fit the knobs and switches.
1 Insert the precision screwdriver
(1.4 mm flat-blade) into the slit
holder (sub) assy, cassette
at claw A and release the claw.
2 Remove the cabinet (front) sub assy.
(Release all claws B to N in A
alphabetical order.)
Note : When removing the cabinet, put cloth
on the end of a screwdriver or use a
polyacetal driver to avoid damage to
the cabinet.
cabinet (front) sub assy
cabinet (front) sub assy
G
F H
I
J
E
K
L
D M
C S716
N
B
4
2-2. MAIN BOARD
3 screw (M1.4), toothed lock (WH)
2 Unsolder the 4 places.
5 MAIN board
4 two claws 1 HEAD FLEXIBLE board (CN301)
2-3. HOLDER (SUB) ASSY, CASSETTE
2 Insert a precision screwdriver
(1.4 mm flat-blade) vertically
into portion A to release the
hinge plate.
3 Portion B to release the
B 5 spring (torsion)
hinge plate.
A
1 Open the holder (sub) assy, cassette.
4 holder (sub) assy, cassette.
5
2-4. MECHANISM DECK
2 Remove the mechanism deck
in the direction of the arrow.
1 Insert the precision screwdriver
(1.4 mm flat-blade) into the slit
and release three claws.
2-5. BELT AND MOTOR
2 two screws (screw (M1.4), special head)
3 motor
· How to apply the belt
belt
M901
wheel assy (NP), capstan
1 belt
6
SECTION 3 SECTION 4
MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS
PRECAUTION PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened · Supplied voltage : 2.5V
swab : · Switch and control position
playback head pinch lever assy VOLUME control : maximum
capstan wheel assy rubber belt AVLS switch : NORM
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments. · Test Tape
4. After the adjustments, apply suitable locking compound to the
Type Signal Used for
parts adjusted.
5. The adjustments should be performed with the rated power WS-48A 3 kHz, 0 dB tape speed adjustment
supply voltage (2.5 V) unless otherwise noted.
TAPE SECTION 0 dB = 0.775 V
Torque Measurement
Mode Torque meter Meter reading Tape Speed Adjustment
Procedure:
20 42 g · cm
FWD CQ-102C
(0.28 0.58 oz · inch)
digital frequency
FWD less than 2 g · cm test tape counter
CQ-102C WS-48A
Back Tension (less than 0.03 oz · inch)
(3 kHz, 0 dB) 0000
more than 60 g · cm 16
FF, REW CQ-201B
(more than 0.83 oz · inch)
set
2 jack (J301)
1. Playback WS-48A (tape center part) in the FWD state and
adjust RV601 so that the frequency counter reading
becomes 3,000 Hz.
Specification Value:
Digital frequency counter
2,985 to 3,015 Hz
Adjustment Location:
RV601
7
TUNER SECTION 0 dB = 1 µV · AM Section
Setting:
· FM Section
RADIO ON/OFF switch: ON
Setting:
BAND switch : AM
RADIO ON/OFF switch: ON
BAND switch : FM
AM Tuning Voltage Adjustment
FM Tuning Voltage Adjustment digital
voltmeter
digital Main board
voltmeter
Main board TP (VT)
TP (VT)
AM TUNING VOLTAGE ADJUSTMENT
FM TUNING VOLTAGE ADJUSTMENT Adjust for a 1.1 ± 0.1 Vdc reading on digital voltmeter.
Adjust for a 8.5 ± 0.3 (14.5 ± 0.5) Vdc reading on digital voltmeter. L4
L3 530 (531) kHz
( ): Except US, Canadian model
108 MHz
AM IF Adjustment, AM Tracking Adjustment
FM Tracking Adjustment
AM RF signal
FM RF signal generator
generator
Put the lead-wire
antenna close to
Main board the set.
0.01 µF
(FM RF IN)
(GND)
Modulation: 400Hz, 30%
Modulation: 1 kHz, 75 kHz dev. (100%) Output level: as low as possible
Output level: as low as possible
level meter
level meter (range: 0.5-5 V ac)
(range: 0.5-5 V ac)
16
16
set
set
2 jack (J301)
2 jack (J301)
· Repeat the procedures in each adjustment several times, and the
FM TRACKING ADJUSTMENT tracking adjustment should be finally done by the trimmer ca-
pacitors.
Adjust for a maximum reading on level meter.
L2 AM IF ADJUSTMENT
87.5 (65.0) MHz Adjust for a maximum reading on level meter.
( ): East European model T1
1,000 (999) kHz
( ): Except US, Canadian model
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 CT1
620 (621) kHz 1,400 (1,395) kHz
( ): Except US, Canadian model
8
Adjustment Location: main board
T1
AM IF
ADJUSTMENT
L4
AM TUNING
VOLTAGE
ADJUSTMENT L1
AM TRACKING
ADJUSTMENT
CT1
L3
FM TUNING
VOLTAGE
ADJUSTMENT
L2
FM TRACKING
ADJUSTMENT
Measurement Points: main board
(FM RF IN)
(VT)
VT FM RF IN
9
SECTION 5
DIAGRAMS
5-1. IC PIN DESCRIPTION
· IC701 µPD17072GB-559-1A7 (SYSTEM CONTROL/LCD DRIVE)
Pin No. Pin Name I/O Pin Description
1 INIT O Initialize output
2, 3 NC -- Not used.
4 MEGA BASS O MEGA BASS ON/OFF output (L: ON, H: OFF)
5 RADIO-ON O Radio circuit power control output
68 KEY OUT1 3 O Key matrix output 1 3
9 NC -- Not used.
10, 11 KEY IN1, 3 I Key input 1, 3
12, 13 BTT-REF1, 2 I Reference voltage input for battery voltage check.
14 MUTE OUT O Mute output (Mute ON: L, Mute OFF: input)
15 SD I SD (with local) signal input
16 BAND O Radio band select output (AM: L, FM: input)
17 HOLD I Key hold input (Key input effect: L, Key input ineffect: H)
18 GND -- Ground
19 EO O PLL error out output
20 VCO (AM) I VCO (AM) input
21 VCO (FM/TV) I VCO (FM) input
22 VDD2 -- Voltage regulator for PLL.
23 VDD1 -- Power supply pin
24 XO -- Crystal oscillator output (75 kHz)
25 XI -- Crystal oscillator input (75 kHz)
26 VDD5 -- Voltage regulator for oscillation circuit.
27 VDD3 -- Power supply for LCD driver.
28, 29 CAP1, 2 -- Stabilized capacitor connection of crystal oscillation power supply.
30 VDD4 -- Power supply for LCD driver.
31 34 COM0 3 O LCD driver common output
35 49 LCD0 14 O LCD driver output
50 CE I L: Clock stop, H: Normally operation
51 TAPE ON I At TAPE ON: H
52 BEEP O BEEP output
53 NC -- Not used.
54 KEY IN2 I Key input 2
55 NC -- Not used.
56 KEY IN4 I Key input 4
10
WM-FX271/FX275
5-2. BLOCK DIAGRAM
EXCEPT
US,CND,C&SA
HP901
FM/AM RF, IF, MPX
US,CND,C&SA PLAYBACK AUDIO POWER AMP
IC1
HEAD IC301(1/2)
S303-2 CP1 FWD IN(L)
DX 10
B.P.F 1 FM IN L OUT 14 L REV IN(L) +
9 5
4 FM/AM MIX FWD
LOCAL CF2 R-CH
10.7MHz R VOLUME
8 FM IF R OUT 13 R CH
NF MIX
6
T1 T1 IN(L) MIX RV301-1 POWER POWER R CH J301
DET OUT 18 30
AM IF AM IFT OUT(L) IN(L) OUT(L) L CH
CF1 24 22 16
450kHz H.PIN(L) COM
7 AM IF 28 PWR
POWER
L. P2
MPX IN 17 RADIO SYSTEM
DC/DC D303 15 SYS CONT 32 L.B-SW OUT(COM) 18
RADIO +B
+B CONV. 23 FM RF 26
POWER MUTE
Q307, T301 R-CH
L2 D2 S305-1
FM AVLS
L2
TRACKING NORM
FM RF 21
21 FM OSC LIMIT
L3
FM
TUNING D3
VOLTAGE RADIO
L3 NF LEVEL
+B
FM OSC SWITCH
L4
RADIO+B Q101
AM
TRACKING VCC2 6 SWITCH BATT+B
D1 Q53
R-CH
20 AM OSC QUAD 12 X2
VCO
BUFFER
Q2, 703 L4
AM OSC
MUTE
TAPE +B
Q306
CT1 24 AM IN
EXCEPT US,CND,C&SA
AMP DOLBY B+ BATT
+B SWITCH +B S303-1
RADIO L1
Q331 S701, 702, 704-708,
S303-2 +B AM
NORM AEP,2AEP,FR,CEV,CH 713, 715
ST FERRITE-ROD
ANTENNA FUNCTION
15 LPF2 LPF1 19 KEY
CT1,L1 CrO2/
FM MONO 10 TUN LED METAL TAPE +B EE,E,9E
AM TAPE +B
TRACKING VDD
JR701
JR702
ON
S701
L.P.F BAND
SWITCH HOLD
Q701,702 OFF
Q703
D701
21 20 19 15 16 5 14 4 52 6 8 10,11,54,56 1 17
VCO(FM/TV)
EO
SD
RADIO-ON
MUTE OUT
MEGA BASS
BEEP
KEY OUT1
KEY OUT3
HOLD
VCO(AM)
BAND
KEY IN1
KEY IN4
INIT
SYSTEM CONTROL/
LCD DRIVE
IC701
BTT-REF1
BTT-REF2
LCD14
X OUT
COM4
COM1
LCD1
X IN
04 31 34 35 49 25 24 13 12
TAPE +B S301
X701 MOTOR SERVO
LCD701 TAPE
LIQUID CRYSTAL
75kHz IC301(2/2) (POWER )
DISPLAY PANEL BATT+B
39 UOUT
DRY BATTERY
M901 SIZE "AA"
40 VOUT IN+ 35 REG (IEC DESIGNATION R6)
CAPSTAN/ 3 1
· R-CH: same as L-CH · Abbreviation REEL
RV601 IC702 D731 2PCS, 3V
CND : Canadian model 41 WOUT M-V REF 34 TAPE VDD
· Signal path MOTOR
(COM) SPEED
: FM C&SA : Central and South America model BATT+B J302
Q308
AEP : Headphone (MDR-E805LP) model DC IN
: AM 3V
2AEP : Earphone (MDR-023) model
: PB FR : French model
CEV : Poland, Czech, Greece and Turkey model
CH : Chinese model
EE : East European model
E : Indication of country of origin
9E : No indication of country of origin
11 12
WM-FX271/FX275
5-3. PRINTED WIRING BOARD
1 2 3 4 5 6 7 8 9 10 11 12 13
A C&SA
C&SA
· Semiconductor
Location
Ref. No. Location
D1 C-3
, C&SA D2 C-6
D3 C-8
B C&SA
D301 I-9
(FM RF IN) C&SA
D302 D-6
D303 F-10
D701 F-10
IC1 C-5
IC301 H-11
IC701 F-11
C IC702 F-13
Q2 D-10
Q101 H-12
Q201 H-12
(VT)
Q301 D-10
Q302 E-6
Q303 D-6
D Q304 G-10
Q305 G-10
Q306 H-10
19 Q307 G-6
PANEL Q308 G-10
Q701 F-12
Q702 F-12