Sony M-800V User manual

M-800V/850V
SERVICE MANUAL
Ver 1.2 2004.08
Photo : M-850V
SPECIFICATIONS
Model Name Using Similar Mechanism M-730V/830V
Tape Transport Mechanism Type MZ-730V-99
MZ-800V-99
US Model
M-850V
AEP Model
M-850V
E Model
M-800V/850V
Chinese Model
East European Model
M-800V
Tourist Model
M-850V
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-873-543-03
2004H16-1
© 2004.08
MICROCASSETTE
TM
-CORDER
Tape (normal position type)
Recording system
2-track 1-channel monaural
Speaker
Approx. 2.8 cm (1
1
⁄ 8 in.) dia.
Tape speed
2.4 cm/s (
15
⁄ 16 ips), 1.2 cm/s (
15
⁄ 32 ips)
Frequency range
300 - 4 000 Hz (with TAPE SPEED switch at 2.4 cm/s)
Input
Microphone input jack (minijack/PLUG IN POWER)
sensitivity 0.21 mV for 3 kΩor lower impedance microphone
Output
Earphone jack (minijack) for 8 - 300Ωearphone
Power output (at 10% harmonic distortion)
250 mW
Power requirements
3 V DC batteries size AAA (R03) ×2/External DC 3V power sources
Dimensions (w/h/d)
Approx. 58.5 ×100 ×22.5 mm (2
3
⁄ 8 ×4 ×
29
⁄ 32 in.) incl. projecting parts
and controls
Mass
Approx. 110 g (3.9 oz) (main unit only)
Supplied accessories
Microcassette tape MC-30 (1) (European model and world model of
M-850V only)
Batteries R03 (SB) (2) (European model and world model of M-850V
only)
Carrying pouch (1) (M-850V and European model of M-800V only)
Design and specifications are subject to change without notice.

2
M-800V/850V
TABLE OF CONTENTS
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.
1. GENERAL ....................................................................3
2. DISASSEMBLY
2-1. Cassette Lid Assy ···························································· 4
2-2. Cabinet (Rear) Sub Assy, Lid, Battery Case ··················· 5
2-3. MAIN Board Section ······················································ 5
2-4. LED Board, Battery Holder ············································ 6
2-5. Mechanism Deck (MZ-730V-99)(MZ-800V-99) ············ 6
2-6. Speaker (2.8cm) (SP901) ················································ 7
2-7. Microphone (MIC901)····················································7
2-8. Ceramic Head (HRPE901,902)
and DC Motor (M901) ···················································· 8
3. MECHANICAL ADJUSTMENTS..............................9
4. ELECTRICAL ADJUSTMENTS ...............................9
5. DIAGRAMS
5-1. Block Diagram.............................................................. 11
5-2. Printed Wiring Board .................................................... 12
5-3. Schematic Diagram....................................................... 13
5-4. Block Diagram.............................................................. 14
6. EXPLODEDVIEWS
6-1. Cabinet Section............................................................. 15
6-2. Mechanism Deck Section (1)
(MZ-730V-99)(MZ-800V-99)....................................... 16
6-3. Mechanism Deck Section (2)
(MZ-730V-99) .............................................................. 17
6-4. Mechanism Deck Section (2)
(MZ-800V-99) .............................................................. 18
7. ELECTRICAL PARTS LIST.....................................19
SERVICING NOTE
[How to recognize MZ-730V-99 and MZ-800V-99]
MZ-730V-99
DC motor (M901)
MZ-800V-99
DC motor (M901)
Ver 1.1 2004.01

3
M-800V/850V
SECTION 1
GENERAL
nN
>PAUSE
CUE/
REVIEW
Tx
TAPE SPEED
DIR
EAR
Tape
direction
indicators
VOL
EAR
Tape counter
VOR
REC lamp (M-850V only)
REC/BATT lamp (M-800V only)
FAST PB (M-850V only)
CUE MARKER
(M-850V only)
BATT/Elamp
(M-850V only)
Microphone
z
>PAUSE
CUE/
REVIEW
Tx
TAPE SPEED
MIC (PLUG
IN POWER)
DIR
FAST PB
(M-850V only)
This section is extracted from
instruction manual.

4
M-800V/850V SECTION 2
DISASSEMBLY
•The equipment can be removed using the following procedure.
Note : Follow the disassembly procedure in the numerical order given.
2-1. Cassette Lid Assy
Cabinet (rear) sub assy, Battery case lid LED board, Battery hoder
Mechanism deck (MZ-730V-99)
Speaker (2.8cm) (SP901)
Ceramic head (HRPE901,902)
Microphone (MIC901)
Cassette lid assy
MAIN board section
Set
2
3
6cassette lid assy
5
4
1Open the cassette lid assy
by pushing button (STOP).
5While push cassette lid ass
y
a bove remove

5
M-800V/850V
1four screws (1.7x16)
2claw
3claw
5cabinet (rear) sub assy
6battery case li
d
4
5screw (B1.7x9)
7screw (IB lock)
6screw (IB lock)
9MAIN board
3Remove the soldering (two portions)
8
2Remove the soldering (eight portions)
1Remove the soldering
(two portions)
4Remove the solderin
g
(four portions)
2-2. Cabinet (Rear) Sub Assy, Battery Case Lid
2-3. MAIN Board Section

6
M-800V/850V
battery holder
* Cautions when assembling
battery coil spring (-)
MAIN board
7LED board
6claw
5battery holde
r
2
3
4
1Remove the soldering
(four portions)
On attaching the battery coil spring (-),
fit it to the groove on the battery holder.
31
2
7 Mechanism deck (MZ-730V-99)(MZ-800V-99)
4 button (STOP)
5 button (PLAY)
6 button (REC)
2-4. LED Board, Battery Holder
2-5. Mechanism Deck (MZ-730V-99)(MZ-800V-99)
Ver 1.1 2004.01

7
M-800V/850V
2knob (DIR)
1
4
3two screws (B2.0)
5speaker (2.8cm) (SP901
)
1claw
2claw
4microphone (MIC901)
3microphone case
5microphone cushion
2-6. Speaker (2.8cm) (SP901)
2-7. Microphone (MIC901)

8
M-800V/850V
2 arm (pinch roller) assy
1 claw
5 ceramic head (HRPE901)
8 ceramic head (HRPE902)
9 two screws (M1.4)
9 two screws (M1.4)
6 screw (M1.4)
4 screw (M1.4)
3 screw (M1.4x2.5)
7 screw (M1.4x2.5)
0 DC motor (M901)
DC motor (M901)
fly wheel
tape counter
qs belt
qa belt
* How to attach the belt
2 arm (pinch roller) assy
1 claw
5 ceramic head (HRPE901)
8 ceramic head (HRPE902)
6 screw (M1.4)
4 screw (M1.4)
3 screw (M1.4x2.5)
7 screw (M1.4x2.5)
MZ-800V-99
MZ-730V-99
0 DC motor (M901) DC motor (M901) fly wheel
tape counter
qs belt
qa belt
* How to attach the belt
2-8. Ceramic Head (HRPE901,902) and DC Motor (M901)
Ver 1.1 2004.01

9
M-800V/850V
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 V DC
TAPE SPEED switch : 2.4cm
Torque Measurement
SECTION 3
MECHANICAL ADJUSTMENTS
Record/Playback/Erase Head Azimuth Adjustment
Setting:
VOL control : mechanical mid
TAPE SPEED switch : 2.4cm/s
VOR switch : OFF
FAST PB switch : OFF (M-850V model only)
Procedure:
1. Mode : Playback
Adjustment Location :
Test Tape
Type Signal Used for Tape Speed
(cm/s)
S-2-A030A 3 kHz, – 20 dB Head Azimuth Adjustment 2.4
WS-24 3 kHz, – 10 dB Tape Speed Adjustment 1.2/2.4
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 arm.
EAR jack (J103)
set
16 Ω
test tape
S-2-A030A
(3 kHz, –20 dB) level meter
Remove the arm in
the direction of the arrow
Head azimuth
adjustment scre
w
(FWD)
Take the arm down
(REV)
Mode
Forward
Reverse
Fast Forward
Rewind
Torque Meter
CQ-102M
CQ-102MR
CQ-201M
CQ-201M
Meter Reading
0.49 to 0.98 mN •m
(5 to 10 g •cm)
(0.07 to 0.140 oz •inch)
more than 2.94 mN •m
(more than 30 g •cm)
(more than 0.42 oz •inch)
Mode
Forward
Reverse
Tension Meter
CQ-403M
CQ-403MR
Meter Reading
more than 2.45 mN •m
(more than 25 g •cm)
(more than 0.35 oz •inch)
more than 2.45 mN •m
more than 25 g •cm
(more than 0.35 oz •inch)
Tape Tension Measurement

10
M-800V/850V
Specification Value:
Tape Speed Frequency counter
1.2/2.4 cm/s 2,880 to 3,120 Hz
Tape Speed Adjustment
Setting:
VOL control : mechanical mid
VOR switch : OFF
FAST PB switch : ON (M-850V model only)
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
tapeshould be within ±0.5%.
Adjustment Location :
First remove the plate, blind.
1. Tape Speed : 2.4 cm/s
Playback WS-24 (tape center part) and adjust RV601 so that
reading on the digital frequency counter becomes 3,000 Hz.
2. Tape Speed : 1.2 cm/s
Playback WS-12 (tape center part) and adjust RV602 so that
reading on the digital frequency counter becomes 3,000 Hz.
0000
EAR jack (J103)
digital frequenc
y
counter
set
16
Ω
test tape
WS-24: tape speed 1.2/2.4cm/s
(3 kHz, –10 dB)
Remove the
plate, blind.
RV602
(1.2 cm)
RV601
(2.4 cm) Speed adjustable
resistors