Sony M-98V User manual

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MICROFILM
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MZ-98-100
SERVICE MANUAL
US Model
Canadian Model
AEP Model
E Model
Tourist Model
M-98V
MICROCASSETTETM-CORDER
Tape
y(normal position type)
Recording system
2-track 1 channel monaural
Frequency range
400 - 3,000 Hz (2.4 cm/s)
Speaker
Approx. 2.8 cm (1 1/8 in.) dia.
Power output
250 mW
Input
Microphone input jack (minijack/plug in power) sensitivity
0.37 mV for 3 kilohms or lower impedance microphone
Output
Earphone jack (minijack) for 8 - 300 ohms earphone
Power requirements
3 V DC batteries R03 (size AAA) ×2/External DC 3 V power
sources
Battery life (Approximate hours) (EIAJ*)
Battery Recording
Sony alkaline LR03 (SG) 9.5
Sony R03 (SB) 3.5
* Measured value by the standard of EIAJ (Electronic Industries
Association of Japan). (Using a Sony Microcassette tape)
For maximum performance, we recommend that you use
SPECIFICATIONS
Ver 1.0 1999. 03
alkaline batteries.
Dimensions (w/h/d) (incl. projecting parts and controls)
Approx. 60.5 ×93.9 ×26.0 mm (2 1/2 ×3 3/4 ×1 11/16 in.)
Mass
Approx. 130 g (4.6 oz.)
Supplied accessories
Remote control microphone ECM-J805 (1)
Microcassette tape MC-30 (1)
Earphone MDR-E123 (1)
Carrying case (1)
Hand strap (1)
Batteries R03 (SB) (2) (Tourist model only)
Design and specifications are subject to change without notice.

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TABLE OF CONTENTS
1. SERVICE NOTE ..........................................................3
2. GENERAL ....................................................................4
3. DISASSEMBLY
3-1. Panel (Rear) Assy ................................................................ 5
3-2. Panel (Lid) Assy .................................................................. 5
3-3. MD Block Assy ................................................................... 6
3-4. Main board, complete ......................................................... 6
3-5. Frame .................................................................................. 7
3-6. Mode Motor Block.............................................................. 7
4. MECHANICAL ADJUSTMENTS..............................8
5. ELECTRICAL ADJUSTMENTS ...............................8
6. DIAGRAMS
6-1. IC Pin Description............................................................. 10
6-2. Block Diagram .................................................................. 12
6-3. Printed Wiring Board ........................................................ 14
6-4. Schematic Diagram ........................................................... 17
7. EXPLODED VIEWS
7-1. Panel (Lid) Section............................................................ 22
7-2. Main Board Section .......................................................... 23
7-3. Mechanism Section (1) ..................................................... 24
7-4. Mechanism Section (2) ..................................................... 25
8. ELECTRICAL PARTS LIST ....................................26
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.

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BP701
(SERVICE)
S701
(MODE SELECT)
TP38
S703
(TAPE DET) TP66
SHORT
– MAIN BOARD (SIDE B) –
‘ terminal
’ terminal
SECTION 1
SERVICE NOTE
This set uses the photo reflector PH701 to detect the rotation of the gear. PH701 is on the main board and so removal of the main board does
not allow the set to detect the rotation of the gear. This makes motor control impossible which prevents normal operation.
When repairing the set as energized with the main board removed, proceed as follows:
• Service the Main Board
1. Short the BP701 (SERVICE) on the main board. (see the Fig. 1.)
2. Refer to the “SECTION3 DISASSEMBLY” (page 5) and open the main board.
3. Put a tape in the set.
4. Fixed at S703 (TAPE DET) on mode or connect the jumper wire between TP38 and GND (TP66).
5. Supply 3 V DC to the battery terminals.
6. Rotate the S701 (MODE SELECT) one turn by hand (mode sensor).
7. Press the desired operating switch (9(, FF, etc.).
8. Check the mode on the liquid crystal panel. Use item 6 repeatedly to switch modes.
9. When finished with the job, disconnect the power and open (remove the short) the BP701 (SERVICE).
Fig. 1.

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SECTION 2
GENERAL This section is extracted
from instruction manual.

– 5 –
1 screws (B1.7x18) (G), tapping
2 screw (B1.7x18) (G), tapping
3 screw (M1.4x5.0), locking
4 panel (rear) assy
switches
knob (MIC SENS)
knob (V
• O • R)
SECTION 3
DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
Note : Follow the disassembly procedure in the numerical order given.
3-1. PANEL (REAR) ASSY
• When installing, position the knobs (V•O•R, MIC SENS) and the switches.
Set Panel (rear)
assy Panel (lid) assy MD block assy Main board, complete Frame Mode motor block
a
b
3
screws (M1.4),
toothed lock
2 CN102
1 knob (EJECT)
5 lever (C holder) assy
4 screw
6 panel (lid) assy
3-2. PANEL (LID) ASSY

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7 screw (B1.7x4), tapping
8 MAIN board, complete
6 screw, precision +P 1.4x1.6
5 screw, precision +P 1.4x1.6
4 CN101
2 unsolders
3 unsolders
1 unsolders
switch
gear, cam
a
b
1 screw (B1.7x4), tapping
2 MD block assy
3 cabinet assy, microphone
4 screws (1.7x3), tapping
5 bracket (speaker)
6 speaker (2.8cm)
switches
switches
spring
knob
(HOLD EJECT)
knob
(FF/CUE•REW/REVIEW)
knobs
(REC PAUSE/REC)
knob (TAPE SPEED)
knob (FAST PB)
switch
3-3. MD BLOCK ASSY
• When installing the MD block assy, position the knobs with the switches.
• When installing the microphone cabinet assy, align the knobs with the spring and switches.
3-4. MAIN BOARD, COMPLETE
• When installing, position the cam gear with the switch.

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3-5. FRAME
• Be careful not to damage the flexible board.
• Remove from ato bto c.
3-6. MODE MOTOR BLOCK
a
a
b
b
c
c
1
screw (1.7x4), tapping (B)
2 cover (HD)
7 frame
3 screw
4 screw
5 absorbent, acoustic, reflection
6 flexible board (head, magnetic)
2 mode motor block
1 screws (M1.4)
3 microphone, electret condenser

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REV side
adjustment screws
FWD side
test tape
S-2-A030
(3 kHz, –20 dB) 10 k
Ω
set
EAR jack (J102)
level meter
PRECAUTION
1. Before adjusting, clean the following parts with a piece of
cotton moistened with alcohol.
record/playback/erase head pinch roller
rubber belt capstan
2. Demagnetize the record/playback/erase head using a head
demagnetizer. (Do not bring the head demagnetizer close to the
erase head.)
3. Do not use a magnetized screwdriver for adjustments.
4. After adjusting, apply screw-locking compound to the adjusted
parts.
5. Unless specified otherwise, use a specified voltage (2.5 V DC)
to perform the adjustments.
Torque Measurement
TAPE SPEED switch : 2.4cm/s
Mode Torque Meter Meter Reading
5 – 10 g • cm
FWD, REV CQ-103M (0.07 – 0.13 oz • inch)
more than 15 g • cm
FF, REW CQ-201M (more than 0.209 oz • inch)
Tape Tension Measurement
TAPE SPEED switch : 2.4cm/s
Mode Torque Meter Meter Reading
more than 15 g
FWD CQ-403M (more than 0.53 oz)
SECTION 4
MECHANICAL ADJUSTMENTS SECTION 5 ELECTRICAL ADJUSTMENTS
Standard Input Level
Input terminal MIC (PLUG IN POWER) jack
Source impedance 300 Ω
Input level 0.77 mV (–60 dB)
Frequency 1 kHz
Standard Output Level
Output terminal EAR jack
Load impedance 10 kΩ
Output level 78 mV (–20 dB)
Test Tape
Type Signal User for
S-2-A030 3 kHz, –20 dB Azimuth Adjustment
WS-24 3 kHz, –10 dB Tape Speed Adjustment
0 dB = 0.775 V
PRECAUTION
• Switch and control position
VOL control : 5 (Mechanical center)
TAPE SPEED switch : 2.4cm/s
V•O•R switch : OFF
FAST PB switch : OFF
MIC SENS switch : H
Record/Playback/Erase Head Azimuth Adjustment
Procedure :
– FWD/REV playback –
• Rotate the screw to adjust level meter reading to the maximum.
Note : Adjust to the maximum peak though there may be two or
three peaks.
Adjustment Location :

– 9 –
– MAIN BOARD (SIDE B) –
IC601
RV602 1.2cm/s
RV601 2.4cm/s
0000
test tape
WS-24
(3 kHz, –10 dB) 10 k
Ω
EAR jack (J102)
digital frequency
counter
set
Tape Speed Adjustment
Procedure :
After adjusting the 2.4cm/s speed, adjust the 1.2cm/s speed.
– FWD/REV playback –
Specification Value :
Adjustment part Tape speed Frequency counter
RV601 2.4cm/s 2,985 – 3,045 Hz
RV602 1.2cm/s 1,470 – 1,530 Hz
3. Tape Speed : 2.4cm/s/REV
Playback WS-24 (tape center part) in the REV state.
Check that digital frequency counter reading is within ± 2% of
reading of step 1.
4. Tape Speed : 1.2cm/s/REV
Playback WS-24 (tape center part) in the REV state.
Check that digital frequency counter reading is within ± 2% of
reading of step 2.
2.4cm/s : 60 Hz
1.2cm/s : 30 Hz
Adjustment Location : main board
1. Tape Speed : 2.4cm/s/FWD
Playback WS-24 (tape center part) and adjust RV601 so that
reading on the digital frequency counter becomes 3,000 Hz.
2. Tape Speed : 1.2cm/s/FWD
Playback WS-24 (tape center part) and adjust RV601 so that
reading on the digital frequency counter becomes 1,500 Hz.

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6-1. IC PIN DESCRIPTION
• IC701 MB89133LPFV-G-488BND (SYSTEM CONTROL)
Pin No. Pin Name I/O Pin Description
1 AVCC — Power supply pin. (+3V)
2 RST I/O Reset signal input/output. Reset signal input: “L”, Software reset signal output: “L”
3 MOD 0 — Not used. (Connect to ground.)
4 MOD 1 — Not used. (Connect to ground.)
5 X 0 I Clock oscillator crystal connect pin (4 MHz). Main clock crystal oscillator signal input.
6 NC — Not used. (Open)
7 NC — Not used. (Open)
8 X 1 O Clock oscillator crystal connect pin (4 MHz). Main clock crystal oscillator signal output.
9 VCC — Power supply pin. (+3V)
10 XDA — Not used. (Connect to ground.) (Sub clock oscillation output.)
11 NC — Not used. (Open)
12 NC — Not used. (Open)
13 XIA — Not used. (Open) (Sub clock oscillation signal output.)
14 SUBM BRK O Set-up motor brake control signal output. “H”: Brake on
15 M CTL 2 O Servo start frequency control signal output. “H”: Frequency down
16 REC CTL 2 O Bias and LED power control signal output. “H”: Bias and LED on
17 NC — Not used. (Open)
18 REC CTL 1 O Record mode select and microphone power control signal output.
“L”: REC and microphone on
19 MUTE CTL O IC101 (CX1347N) audio mute signal output. “H”: Mute on
20 C/R CTL O CUE/REVIEW mute control signal output. “H”: Mute on
21 NC — Not used. (Open)
22 PB CTL O REC/PB switch signal output. “H”: Playback mode
23 FPB CTL O FAST PB servo control signal output. “H”: FAST PB on
24 VOR COND1 I VOR IC (IC102: NJM2072M) detect signal output. “L”:VOR on (Motor stop)
25 VSS — Ground
26 PRE AMP O IC101 (CX1347N) power control signal output. “H”: Power on
27 M SPD O Motor speed control signal output (CUE increase speed). “H”: Increase speed
28 NC — Not used. (Open)
29 SUBM CTL O Set-up motor control signal output. “H”: Motor on
30 M BRK O BSL motor brake control signal output. “H”: Brake on
31 M DIR O BSL motor rotate direction control signal output. “H”: CCW, “L”: CW
32 NC — Not used. (Open)
33 M CTL 1 O BSL motor ON/OFF control signal output. “H”: Motor on
34 EN V O System peripheral power control signal output. “L”: Power on
35 VOR COND2 I VOR IC (IC102: NJM2072M) power detect signal input. “L”: Power on
36 REV NAIL I REV claw detect signal input. “L”: With REV claw
37 FWD NAIL I FWD claw detect signal input. “L”: With FWD claw
38 NC — Not used. (Open)
39 NC — Not used. (Open)
40 SERVICE I Service mode detect signal input. “L”: Service mode
41 MD 3 I MD 3 position detect signal input. “L”: MD 3
42 MD 2 I MD 2 position detect signal input. “L”: MD 2
43 MD 1 I MD 1 position detect signal input. “L”: MD 1
44 NC — Not used. (Open)
45 NC — Not used. (Open)
46 MD 0 I MD 0 position detect signal input. “L”: MD 0
47 FPB COND I FAST PB mode detect signal input. “L”: FAST PB mode
48 RIF COND I Reflector signal detect signal input. “L”: Edge input
49 NC — Not used. (Open)
50 WAKE UP I Microcomputer start-up signal input by key input (H edge input).
SECTION 6
DIAGRAMS