Sony M-430 - Microcassette Recorder User manual

– 1 –
SERVICE MANUAL
M-430
MICROCASSETTE
TM
-CORDER
Tape
y(normal position type)
Recording system
2-track 1-channel monaural
Speaker
Approx. 3.6 cm (1 7/16 in.) dia.
Tape speed
2.4 cm/s (15/16 ips), 1.2 cm/s (15/32 ips)
Frequency range
250 - 4,000 Hz (with TAPE SPEED switch at 2.4 cm/s)
Output
Earphone jack (minijack) for 8 - 300 ohms earphone
Power output (at 10% harmonic distortion)
160 mW
Power requirements
3 V DC batteries size AA (R6) ×2/External DC 3V power sources
Dimensions (w/h/d)
Approx. 62.2 ×121.5 ×24.3 mm (2 1/2 ×4 7/8 ×31/32 in.) incl. projecting
parts and controls
Mass
Approx. 125 g (4.5 oz.)
SPECIFICATIONS
Ver 1.0 1999. 02
Supplied accessory
Microcassette tape MC-30 (1)
Design and specifications are subject to change without notice.
MICROFILM
US Model
AEP Model
E Model
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MZ-430-99

– 2 –
TABLE OF CONTENTS
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.
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.
1. GENERAL ....................................................................3
2. DISASSEMBLY
2-1. Lid Assy, Cassette ............................................................... 4
2-2. Lid, Battery Case ................................................................ 5
2-3. Cabinet (Rear) Assy ............................................................ 5
2-4. Main Board ......................................................................... 6
2-5. Mechanism Deck................................................................. 6
2-6. Head, Ceramic..................................................................... 7
3. MECHANICAL ADJUSTMENTS..............................8
4. ELECTRICAL ADJUSTMENTS ...............................8
5. DIAGRAMS
5-1. Block Diagram .................................................................. 10
5-2. Printed Wiring Board ........................................................ 11
5-3. Schematic Diagram ........................................................... 13
6. EXPLODEDVIEWS
6-1. Cabinet Section ................................................................. 15
6-2. Mechanism Deck Section.................................................. 16
7. ELECTRICAL PARTS LIST.....................................17

– 3 –
SECTION 1
GENERAL This section is extracted
from instruction manual.

– 4 –
SECTION 2
DISASSEMBLY
•The equipment can be removed using the following procedure.
Note : Follow the disassembly procedure in the numerical order given.
2-1. LID ASSY, CASSETTE
2 Stop the lid assy, cassette
halfway.
1
3
4
precision screwdriver
or equivalent
cabinet (front)
lid assy,
cassette
top view
precision screwdriver
or equivalent
9 lid assy, cassette
5
8
6
7
Set Lid assy,
cassette Cabinet (rear) assy Main board Mechanism deck Head, ceramic
Lid,
battery case
Note : When removing the cassette lid, put cloth on the end of a
screwdriver or use a polyacetal driver to avoid damage to
the cabinet.

– 5 –
2-3. CABINET (REAR) ASSY
Note : When installing, fit the knobs and switches.
2-2. LID, BATTERY CASE
3 claws
5 lid, battery case
2
1
2
1 screw (1.7x16)
3 screw (B1.7x5), tapping
2 screw (1.7x16)
5 claw
4 claws
switch
knob
6 cabinet (rear) assy

– 6 –
2-5. MACHANISM DECK
2-4. MAIN BOARD
7 (M1.4x3.0), locking
8 (M1.4x3.0), locking
6 mic assy
9 MAIN board
1 Unsolder the 2 places. 2 Unsolder the 2 places.
3 Unsolder the 4 places.
4 Unsolder the 2 places.
5 Unsolder the 2 places.
4 button (STOP)
2 button (REC)
1
3
button (PLAY)
mechanism deck
(MZ-430-99)

– 7 –
2-6. HEAD, CERAMIC
1 claw
3 M1.4, special head
4 M1.4, special head
2 arm (pinch roller) assy
5 head, ceramic

– 8 –
EAR jack (J101)
set
16
Ω
test tape
S-2-A030
(3 kHz, –20 dB) level meter
Remove the
cover (AZ).
head azimuth
adjustment screw
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback/erase head pinch roller
rubber belts capstan
2. Demagnetize the record/playback/erase head with a head
demagnetizer. (Do not bring the head demagnetizer close to the
erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Power supply voltage : 3 Vdc
TAPE SPEED switch : 2.4cm/s
Torque Measurement
Mode Torque Meter Meter Reading
5 – 13 g • cm
Forward CQ-103M (0.07 – 0.180 oz • inch)
more than 30 g • cm
Fast Forward CQ-201M (more than 0.42 oz • inch)
more than 30 g • cm
Rewind CQ-201M (more than 0.42 oz • inch)
TapeTension Measurement
Mode Tension Meter Meter Reading
more than 20 g
Forward CQ-403M (more than 0.28 oz)
SECTION 3
MECHANICAL ADJUSTMENTS
Record/Playback/Erase Head Azimuth Adjustment
Setting:
VOL control : mechanical mid
TAPE SPEED switch : 2.4cm/s
Procedure:
1. Mode : Playback
Adjustment Location :
Test Tape
Type Signal Used for Tape Speed
(cm/s)
S-2-A030 3 kHz, – 20 dB Head Azimuth Adjustment 2.4
WS-24 2.4
WS-12 3 kHz, – 10 dB TapeSpeedAdjustment 1.2
SECTION 4
ELECTRICAL ADJUSTMENTS
2. Turn the adjustment screw to obtain the maximum reading on
level meter.
Note: Several peaks may appear, but the maximum.
First remove the cover (AZ).

– 9 – – 10 –
M-430
5-1. BLOCK DIAGRAM
SECTION 5
DIAGRAMS
0000
EAR jack (J101)
digital frequency
counter
set
16
Ω
test tape
WS-24: tape speed 2.4cm/s
WS-12: tape speed 1.2cm/s
(3 kHz, –10 dB)
Remove the
plate, blind.
RV601
1.2cm/s
RV602
2.4cm/s
speed adjustable resistors
(REC / PB)
HRPE901
REC/PB/ERASE
HEAD
(ERASE)
D102 BATT
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
2PCS, 3V
-+
DC IN 3V
CN101
SP101
SPEAKER
J101
EAR
MIC901
MIC
S101-4
(REC/PB)
PB REC
S101-3
(REC/PB)
PB REC
S101-2
(REC/PB)
PB REC
S101-1
(REC/PB)
PB REC
+3V
+3V
+3V
115 3 14
9
8 4
ALC
PRE / POWER AMP
IC101
S602
2.4 cm 1.2 cm
2.4 cm 1.2 cm
TAPE
SPEED
RV601, 602
TAPE SPEED
RV101
VOL
RV602
1.2 cm
RV601
2.4 cm
MOTOR SERVO
IC601
M
+
_M901
MOTOR S601
PAUSE
OFF ON
S102
(POWER)
: REC
: PB
Signal Path
04
-1
-2
Tape Speed Adjustment
Setting:
VOL control : mechanical mid
Procedure:
• Reform 2.4 cm/s speed adjustment before 1.2 cm/s speed
adjustment mode : playback
Frequency difference between the beginning and the end of the tape
should be within ±0.5%.
2.4 cm/s (15 Hz)
1.2 cm/s (15 Hz)
Adjustment Location :
First remove the plate, blind.
1. Tape Speed : 2.4 cm/s
Playback WS-24 (tape center part) and adjust RV602 so that
reading on the digital frequency counter becomes 3,000 Hz.
2. Tape Speed : 1.2 cm/s
Playback WS-12 (tape center part) and adjust RV601 so that
reading on the digital frequency counter becomes 3,000 Hz.
Specification Value:
Tape Speed Frequency counter
2.4 cm/s 2,880 to 3,120 Hz
1.2 cm/s 2,850 to 3,150 Hz

– 11 – – 12 –
M-430
5-2. PRINTEDWIRING BOARD
Note:
•X: parts extracted from the component side.
•b: Pattern from the side which enables seeing.
1
A
B
C
D
E
F
G
H
2345678910111213
HRPE901
REC/PB/ERASE
HEAD
(REC/PB)
(ERASE)
HD+
HD–
HE+
HE–
()
D102 G-3
IC101 D-6
IC601 E-9
• Semiconductor
Location
Ref. No. Location