Sony M-727V User manual

SERVICE MANUAL
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COUNTER
TAPE
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Model Name Using Similar Mechanism
Tape Transport Mechanism Type
M-I21V
US Model
Canadian Model
AEP Model
E Model
Tourist Model
NEW
MZ-627V-14
SPECIFICATIONS
Tape
CMIEROCASSETTE)™ (normal position type)
Recording system
2-track 1-channel monaural
Speaker
Approx. 3.6 cm (1s in.) dia.
Tape speed
2.4 cm/s (‘%o ips), 1.2 cm/s (‘2 ips)
Frequency range
250 — 4,000 Hz
Input
Microphone input jack (minijack/PLUG IN POWER)
sensitivity 0.24 mV for 3 kilohms or lower impedance microphone
Output
Earphone jack (minijack) for 8 - 300 ohms earphone
Power output
160 mW (at 10% harmonic distortion)
Battery life (recording)
SONY SUM-3 (NS) 5.5H
SONY ALKALINE AM3 (N) 14H
Power requirements
* Two R6 (size AA) batteries: 3 V DC
* Sony AC-E30M AC power adaptor (not supplied):
220 V AC, 50 Hz (European model)
120/220 V AC, 50/60 Hz (model for other countries)
* Sony DCC-E130L car battery cord (not supplied): 12 V car battery
Dimensions (w/h/d)
Approx. 66.7 x 120.8 x 25 mm incl. projecting parts and controls
Mass
Approx. 180 g incl. batteries
Supplied accessories
Microcassette tape MC-30 (1) (AEP, Tourist)
Carrying case (1) (AEP, Tourist)
R6 (size AA) batteries (2) (AEP Tourist)
ERPHONE (1) (Tourist)
Design and specifications are subject to change without notice.
MICROCASSETTE®CORDER
SONY.

SERVICING NOTE
Flexible Circuit Board Repatring
© Keep the temperature of the soldering iron around 270
°C during repairing.
e 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
e@ Never reuse a disconnected chip component.
@ Notice that the minus side of a tantalum capacitor may
be damaged by heat.
SECTION 1 This section is extracted from
e Parts Identification
EAR
FAST
PB
TAPE
SPEED»
TAPE
COUNTER
instruction manual.
GENERAL
MIC (PLUG IN POWER)
MICROPHONE
REC/BATT
CUE MARKER
@
tte PAUSE
44 CUE/REVIEW >>
mA
VOR

SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
CASSETTE AND BATTERY LIDS
® Stop the cassette lid (C)
halfway.
lid (C) precision
Screwdriver
or cassette
equivalent lid (C)
precision
screwdriver
or
equivalent
CABINET two claws
a= ae ~~ battery terminal (a)
Ohl) Ss - battery coil spring (c)
y
battery coil
G spring (b)
@ BTP1.7 x 12
5] oral knob Pree 2) by abies
inside t t side. cabine Be.
rom inside to out side fee ae exe
LYS”
5 —_— SS mete es
SAXQ
Sec
Ax
b&b
\\
& Pa Au eee . :
=k
SST
@ knob (FR)

MECHANISM DECK
cabinet (front c)
speaker (3.6cm)
©
&
knob spacer
bracket (microphone)
M2Z-627V-14
button (REC)
oN. (s MIC901
cushion
(microphone)
@ @ BTP1.7x3
main board
@ screw
KNOB
torsion
spring (toggle)
arm (EJECT-B)
torsion spring (toggle)
Remove claw
from inside.
A
SN
2,
knob OR)

ARM (EJECT) FITTING
torsion
spring
Hung
it
on
(toggle)
shaft
Put it through
the hole.
Move the spring
twice
or
three
times.
CASSETTE LID (C) FITTING
cassette lid (c)
cassette lid (c)
Hold shaft up by
pushing stop button.
Put the stopper portion
in the hole.

SECTION 3
ADJUSTMENTS
2-1. MECHANICAL ADJUSTMENTS
AND MEASUREMENT
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 head with a head demagentizer.
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
w&
Torque Measurement
wr on
Tape Tension Measurement
Meter | Meter Reading
more than 30 g
CQ-403M
(more
than
0.42
02)
2-2. ELECTRICAL ADJUSTMENTS
5~13g *cm
(0.07 — 0.1800z « inch)
more than 15 g* cm
(more than 0.210z ¢ inch)
Test Tape
[om
[eee
[ee
PR
3
kHz,
—
10
dB
WS-24 2.4
$-2-A030 | 3 kHz, — 20 dB |} Head Azimuth Adjustment
Record/Playback Head Azimuth Adjustment
Tape Speed Adjustment
setting:
VOLUME control : mechanical mid
TAPE SPEED switch : 2.4cm/s
VOR switch : OFF
Procedure:
1. Mode: playback
test tape
S-2-A030
(3 kHz, — 20 dB)
— set |
earphone jack
2. Turn the adjustment screw to obtain the maximum reading on.
VTVM.
Note: Several peaks may appear, but the maximum.
Adjustment Location:
First remove the cover
(azimuth).
bs
head azimuth
adjustment screw
Tape Speed adjustment
Setting:
VOLUME control : mechanical mid
VOR switch : OFF
Procedure:
®@ Reform 2.4 cm /s speed adjustment before 1.2 cm/s speed adjustment
mode : playback
speed checker
LFM-30
test tape or
WS-24: tape speed 2.4 cm frequency counter
WS-12: tape speed 1.2 cm
(3 kHz, — 10dB)
earphone jack
Tape Speed Speed checker
requency counter
3,000 + 90 Hz
Frequency difference between the beginning and the end of the tape
should be within 0.5%.
2.4cm/s (15 Hz)
1.2 cm/s (15 Hz)
Adjustment Location:
RV601
1.20m
speed adjustable resistors

M-727V
SECTION 4
DIAGRAMS
e Semiconductor
e Semiconductor Lead Layouts
Location
7
4-1.
PRINTED
WIRING
BOARD
red
12 43 14 45 7 19 20 24 22 23
D101 D-12 XN4601 188335 i — 4 __| 17 _ 48 —
D-13
J102
D-11
DC
IN
3V
J-5 oS
5102 aide $104
ee
ox
rs
[44__
FAST
PB]
[TAPE
SPEED]
S
CATHODE
[2.4cm|—>[1.2cm]
6-13 (MAIN BOARD] PB aa
— a
D-10 J103
E-10
F-10
J-9 DRY BATTERY
K-10 XN4501 GL-8PR42 D — SIZE "AA"
K-9 IEC DES GNATION R6)
K-20
K-17 7 SPEAKER
K-19
G-14 E
L-18
J101
“ ; i
(PLUG IN POWER)
3
6 F
2
1 ANODE CATHODE jt
RED
6 wico0i Ql
DA204U |_| ov
anode, cathode anode H MOTOR
| RVIOL
cathode cathode
anode ; N.C. \
4
J
HEAD
Note on Schematic Diagram: . Ly FLEXIBLE
e All capacitors are in uF unless otherwise noted. pF: ppyF BOARD
50 WV or less are not indicated except for electrolytics K
and tantalums.
e All resistors are in Q and % W or less unless otherwise |
specified.
e —e+ : printed resistor. 7 {0}
e : B+ Line. S103
e
({___]:
panel
designation.
vor]
e [~~] : adjustment for repair. M
® Total current is measured with no cassette installed. EN gE lad
@ Power voltage is dc 3 V and fed with regulated dc power supply I
from external power voltage jack.
@ Voltages are dc with respect to ground under no-signal N
conditions. |_|
no mark: PLAY e IC Block Diagrams
¢ ): REC
® Voltages are taken with a VOM (10 MQ/V). 2 ; LAS521M NJM2072M
Voltage variations may be noted due to normal production
eines
:
:
=
CONT
NC
VS
GND
INPUT
CG)
Vcc
e@ Signal path. (8) @) 6) )
x : PB
x»
:
REC
L
GAIN
CONT)
(7)
OUTPUT
2
Note on Printed Wiring Board: AMP OUT @) OUTPUT |
® o——:; parts extracted from the component side.
e
@
:
Through
hole.
Gye
e
:
Pattern
from
the
side
which
enables
seeing.
o
GNO@)
©)
TIME
CAP
® ©€---- ; Pattern of the rear side. N ce
e {._] : printed resistor of the rear side.

M-727V
4-2. SCHEMATIC DIAGRAM
1
2
3
4
=)
6
7
8
g
10
11
12 13
14
[B+] 5101
I
TP2
(POWER)
$ 3.0V O \
R102 R103
RI29 fy Sy RON , sis
68 820 100
£102 ay mdb 102 TP
re 0.047 PRE AMP 9 J102
B
MIC9O1
po
>
3
rear
{ac
IN
3V
MIC
cit
°
oe
Ho
0.901
1P18 R104 R106 Fo] gay aneneay
Jt! i a Ioe ae wn 1C1 01 “Ls SIZE"AA"
wie : POWER AMP = (IEC DESIGNATION)
(PLUG
IN
POWER)
2PCS
3V
C10}
0.0047
C B
121
Fae ee 7 a
= es etl ose cz ‘
recrra me OTT = 2 favy ais
| Lo] O O Wy het o [EAR]
HCB901 4 MEME = R119 0.001
|
wae
Ree
47
fl
TPS
me
{>
ERASE xX a: Ho} 1-0 ¢ Bay S102 4/4
D 3 2st2412K yy oly Y)reg (CHASSIS)
nal 1P22 AGC v_y¥
+—[o4
SP901
-
a701
PB—>
REC
1P7
ee
(|
“ee ws R
HEAD VOR/CUE MARKER = Fo] SPEAKE
FLEX
|
BLE
SWITCHING
Q401,
702
LEO
DRIVE
BOARD rs +
M01
D401 MOTOR
GL8PR42 22
REC/BATT] °:3¥
THP602
210/2700ppm/C
TPS
[2.4cn}—~[1. Zen]
1 Q703
| 2501819A
1 SERVO
_| SWITCHING
2.3
| a401 (272)
1 XN4312
LL
Q302, 303
CUE MARKER
SWITCHING
mo
Oo
&-
aso2 7a} |
TP30 ft XN4S14
I
I
F
$104
1/2)
'
:
TAPE SPEED 2
I
I
4
o
$301
:
ag
CUE]
4,
13!
=
gi
2.9
(0)
FR
1C601
R306
FS)
,
0303
mo
LAS521M
roo
I
2saiaiaa
cats
R305
2
R307
0.1
47k
Bs
1
IC601| .
MOTOR SERVO
er aait
Q301 (2/2) :
x01 |
TAPE SPEED
cz04 +t
2.6 (0)
4.7 AV Q301
MULTI VIBRATOR
Q302 (2/2)
XN4514
Q304
VOR
SWITCHING
RV601, 602
[SPEED ABJ.]
eo ae —10—

NOTE:
@ -XX and -X mean standardized parts, so they
may have some difference from the original
one.
@ Color Indication of Appearance
Example:
KNOB, BALANCE (WHITE)... (RED)
* t
Parts Color
(1) GENERAL SECTION
Parts
Cabinet’s Color
SECTION 5
EXPLODED VIEWS
® Items marked “+” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
@ The mechanical parts with no reference
number in the exploded views are not
supplied.
Hardware (# mark) list and accessories and
packing materials are given in the last of the
electrical parts list.
20
Ref. No.
Cm GN eH
Part No.
3-318-203-51
3-914-944-01
3-914-945-01
3-318-203-72
3~914-938-01
3~914-950-01
3-914-930-01
3-831-441-XX
3-914-948-11
3-914-947-11
3-914-946~11
3-328-319-11
3-669-481-07
3-914-934-01
3-914~933-01
3~914-932-01
3-914-879-01
SP901
MIC901
Description Remark
CABINET (FRONT) (C1) ASSY
SPRING (TOGGLE), TORSION
ARM (EJECT-B)
LID (CO) ASSY, CASSETTE
KNOB (F~PB) (FAST PB)
COVER (AZIMUTH)
BRACKET (MICROPHONE)
CUSHION (MICROPHONE)
SCREW (1. 7X3), TAPPING
A-3016-595~-A MAIN BOARD, COMPLETE
6
Description Remark Ref. No. Part No.
SCREW (B1. 7X12), TAPPING 18 X-3368-595-1
BUTTON (CUE) 19 3-914~-931-01
KNOB (PAUSE~-B) (PAUSE) 20 3-914-936-01
SCREW (B1. 7X5), TAPPING 21 X-3368-592-1
KNOB (FR) 22 3-914-878-01
LID, BATTERY CASE 23 3-914-952-01
CUSHION (BATTERY CASE LID) * 24 3-914-949-0601
SPACER, KNOB * 25 3-914-937-01
BUTTON (REC) 26 3~318-382-31
BUTTON (PLAY) * 27
BUTTON (STOP) 28 3-342-156-51
STRAP, HAND 29 3-914-929-01
PIN (DIA. 1X10), PARALLEL * 30 3-914-958-31
SPRING (B), BATTERY COIL 31 3-358-363-11
TERMINAL (A), BATTERY MICSQ1 1-542-136-11
SPRING (C),
KNOB (VOR)
BATTERY COIL
SPS01
1-344-657~12
SCREW
PAPER, SHIELD
CABINET (REAR)
PLATE, BLIND
MICROPHONE, ELECTRET CONDENSER
SPEAKER (3. 6CM)

(2) MECHANISM SECTION
(MZ-627V-14)
& SESS 67
oe
> RZ.
ae p va ee eee
a
ay
M901
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
51 3-704-243-11 SCREW (P1. 7X2. 0) 68 3-704-245-42 SCREW (P1. 4X3. 0)
* 52 3-914-920-01 PLATE (FR), LOCK 69 3-378-792-01 SPRING, COMPRESSION
* 53 3-914-919-01 SLIDER (FR) 70 3-914-914-01 GUIDE, TAPE
54 3-377-420-11 BELT * 71 3-914-913-01 LEVER (PLAY)
55 X-3368-702-1 FLYWHEEL (1.3) ASSY 72 X-3368-585-1 PINCH LEVER ASSY
56 3-914-903-01 SPRING (FR), TORSION 73 3-350-945-11 WASHER
* 57 X-3368-486-1 LEVER (STOP) ASSY 74 3-914-902-01 SPRING (P), TORSION
58 3-914-906-01 SPRING (S. OFF), TORSION 75 3-914-904-01 SPRING (PFR), TORSION
59 3-914-915-01 ARM (S. OFF) 76 X-3368-584-1 ARM (MIDWAY GEAR) ASSY
60 X-3368-582-1 REEL ASSY, T 77 3-331-007-21 WASHER
61 3-343-948-01 BELT 78 3-914-916-01 ARM (CKAW DETECTION)
62 1-548-579-21 COUNTER, TAPE (SMALL TYPE) 79 X-3368-587-1 REEL ASSY, S
* 6§3 3-914-923-01 COVER, MD 80 3-914-907-01 SPRING (MIDWAY GEAR), TORSION
64 3-366-892-11 SCREW (M1. 4X1. 4) * 81 X-3368-701-1 CHASSIS (COMP.) ASSY (C), MECH
65 3-914-908-01 SPRING (REC LOCK), TENSION HCB901 1-500-135-11 HEAD, MAGNETIC (REC/PB/ERASE)
* 66 X-3368-583-1 LEVER (REC) ASSY M901 1-698-384-11 MOTOR, DC
67 3-703-816-82 SCREW (M1. 4X6.0), SPECIAL HEAD
—12—