Sony M-627V - Microcassette Recorder User manual

SERVICE MANUAL
Tape
GIEROCASSETTE™ (normal position type)
Recording system
2-track 1-channel monaural
Speaker
Approx. 3.6 cm (176 in.) dia.
Tape speed
2.4 cm/s ('%6 ips), 1.2 cm/s ('%z2 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-E30L AC power adaptor (not supplied):
120 V AC, 60 Hz
*Sony DCC-E130L car battery cord (not supplied):
12 V car battery
M-
MIGROCABSETTE thd
SPECIFICATIONS
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
M-627V/671V
US Model
Canadian Mode!
M-627V/677V
AEP Model
M-627V
Photo: M-627V
MZ-627V-14
Dimensions (w/h/d)
Approx, 66.7 x 120.8 x 25 mm (2% x 4’ x 1 in.) incl.
projecting parts and controls
Mass
Approx. 180 g (6.4 0z) incl. batteries
Supplied accessories
AC power adaptor (1, M-677V only) .
Battery charge adaptor (1, M-677V only)
Rechargeable batteries (2, M-677V only)
Microcassette tape MC-30 (1, M-627V AEP only)
Carrying case (1, M-627V AEP only)
R6 (size AA) batteries (2, M-627V AEP only)
Design and specifications are subject to change without notice.
MICROCASSETTE*CORDER
SONY.

SERVICING NOTE
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 damaged by heat.
SECTION 1
GENERAL
e Parts Identification
COUNTER
SAFETY-RELATED
COMPONENT
WARNING!!
COMPONENTS
IDENTIFIED
BY
MARK
A
OR
DOTTED
LINE
WITH
MARK
A
ON
THE
SCHEMATIC
DIAGRAMS
AND
IN
THE
PARTS
LIST
ARE
CRITICAL
TO
SAFE
OPERATION.
REPLACE
THESE
COMPONENTS
WITH
SONY
PARTS
WHOSE
PART
NUMBERS
APPEAR
AS
SHOWN
IN
THIS
MANUAL
OR
IN
SUPPLEMENTS
PUB-
LISHED
BY
SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE MARQUE /\
SUR LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE
FONCTIONNEMENT.
NE
REMPLACER
CES
COM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPLEMENTS PUBLIES PAR SONY.
—
This section is extracted from
instruction manual.
MIC (PLUG IN POWER)
Microphone
REC/BATT
e
atte PAUSE
<4 CUE/REVIEW >>
|
VOR

SECTION 2
DISASSEMBLY
Note:
Follow
the
disassembly
procedure
in
the
numerical
order
given.
CASSETTE
AND
BATTERY
LIDS
front
cabinet (B)
© Stop the cassette lid (B)
halfway.
lid (B) precision
screwdriver
cassette
lid (B)
or
equivalent
precision
screwdriver
or
equivalent
battery case lid
battery case lid
CABINET
battery terminal (a)
battery coil spring (c)
battery coil
@ spring (b)
@
BTP1.7x
12
|
SS
© Push knob (PAUSE-A)
from
inside
to
out
side.
@
cabinet
(rear)

MECHANISM DECK
cabinet (front B)
speaker (3.6cm)
bracket (microphone)
MZ-627V-14
button (REC)
button (PLAY) SAP
4)
“ew
oN a MIC301
cushion
(microphone)
@ BTP1.7 X 3
NAC
@ screw
KNOB
torsion
spring
(toggle)
arm (EJECT-B)
torsion spring (toggle)
Remove claw
from inside.
A
<3

ARM (EJECT-B) FITTING
arm (EJECT-B)
torsion spring Hung it on
(toggle) shaft,
the hole.
Move the spring
twice or three times.
CASSETTE LID (B) FITTING
uw
cassette lid (B) | \
Hold shaft up by
pushing stop button.
cassette lid (B)
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
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
wr
Torque Measurement
5~13g * cm
(0.07 — 0.18002 « inch) COM
Tape Tension Measurement
COQ-403M more than 30 g
(more than 0.42 0z)
2-2. ELECTRICAL ADJUSTMENTS
Test Tape
Ce
ee
3kHz,
-
10dB|
Tape
Speed
Adjustment
S-2-A030!
3
kHz,
—
20
dB
|
Head
Azimuth
Adjustment
Record/Playback Head Azimuth Adjustment
5~13g °cm
(0.07 — 0.1800z * inch)
more than 15 g* cm
(more than 0.210z * inch)
setting:
VOLUME control : mechanical mid
TAPE SPEED switch : 2.4cm/s
VOR switch : OFF
Procedure:
1. Mode: playback
test tape
$-2-A030
(3 kHz, — 20 dB)
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).
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 oF
WS-24: tape speed 2.4 cm frequency counter
WS-12: tape speed 1.2 cm
(3 kHz, — 10dB)
earphone jack
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
1.2cm
speed adjustable resistors

M-627V/677V
SECTION 4
DIAGRAMS
@ Semiconductor e Semiconductor Lead Layouts 4-1. PRINTED WIRING BOARD
Location
ale
eS
cee
he
eo
Pe
I
ae
13
“4
|
6
|
€@
|
@7
|
19
20
|
2
[|
2
|
2
:
XN4312
GL-8PR42
Ji02
Location
XN4601
Fi
SBN
ai
E-12
—_
OC
E-13 : |
0-17
Bigs
ae
$104
K-5
B
me
TAPE
SPEED
[2.4em] —>[i.2cm]
H-11 {MAIN BOARD] PB
1-18 weer
G-13
6
K
C
J103
3 F
[EAR]
|
=a
D-1 0 1 ANODE CATHODE
E-10
DRY
BATTERY
F~11
D
“=
tige
DESIGNATION
R6)
K-17
DA204U
YEL
2pcs
3V
K-19
|_|
SP90I
De
G-14
SPEAKER
aoe
L-18 anode, cathode anode E
J-19
= JO!
cathode
cathode
Mic
|
ha:
anode N.C. : (PLUG IN POWER)
188335 fl
RED
Ii G MIC9Ol @
MIC
ANODE ;
CATHODE H
; RVLOL
|
: HEAD
Note
on
Schematic
Diagram:
=
FLEXIBLE
e All capacitors are in wF unless otherwise noted. pF: ppF
50 WV or less are not indicated except for electrolytics K
and
tantalums.
|
REC/PB
®
All
resistors
are
in
Q
and
%
W
or
less
unless
otherwise
fe
Se
specified. i |
e ewe : printed resistor. ERASE
° : B+ Line.
e [{]: panel designation.
©
[(——]
:
adjustment
for
repair.
M
® Total current is measured with no cassette installed.
e Power voltage is dc 3 V and fed with regulated de power supply
from external power voltage jack.
® Voltages are de with respect to ground under no-signal N
conditions.
no mark: PLAY
Ci
REC
e
IC
Block
Diagrams
® Voltages are taken with a VOM (10 MQ/V).
Voltage
variations
may
be
noted
due
to
normal
production
LA5521M
NJM2072M
tolerances,
ce
VS
GND
®
Signal
path.
CONT
INPUT
(1)
(8)
Vee
>
:
PB
(8)—{7)—6)—)
oe
ee
>>): REC
Note on Printed Wiring Board:
o———— : parts extracted from the component side.
® : Through hole.
: Pattern from the side which enables seeing.
®----@ ; Pattern of the rear side.
[| : printed resistor of the rear side.
C2) 3) 4)
NC NC Veco OUT
GAIN CONT)
()
©
(7) OUTPUT 2
AMP OUT G) (6) OUTPUT |
RECOVERY
GNO@) SO) TIME CAP
e.

SCHEMATIC DIAGRAM
1 2
MICSO}t
MIC
Ji0t
lesa once Ic
lesa once IN POWER)
em eee
QI01, 102
PRE AMP
$101
TP2 (POWER)
.
I
3.0V Oo
POWER AMP
IC101
NJM2073M
= POWER
A 5102 G/4)
PB—REC 7
TP1O
1C101 ear}
PB=<—
SWITCHING TPS
$106
$104 1/2)
TAPE SPEED
-4cm|-—[1.2cn]
25818194
C701 1€701 vet
0.047 NJM2072¢ SERVO 4.7k B®)
F VOR SWITCHING e
>
R701 S
10k 1C701 RV&01, 602 &
TP36, SPEED ADJ 2
meee R703
k fe] 5. 9x = $104 (2/2)
— MOTOR SERVO
TAPE SPEED
[1. 2cn]+——>[2. 4cn|
a
a
i
a
i
ee
To
es,
Le
M-627V/677V
13 14
BRY BATTERY
SIZE "AA"
{IEC BESEGNATION R&}
(2PCS 3V)
roy (CHASSIS)
ae 5P901
™ SPEAKER
i TP7 ,,
SaEN
Z/
g I ro
MSOI
MOTOR

NOTE:
@
-XX
and
-X
mean
standardized
parts,
so
they
may
have
some
difference
from
the
original
one.
® Color Indication
Example:
KNOB, BALANCE (WHITE)... (RED)
t t
Cabinet’s Color
of Appearance Parts
Parts 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.
(1)
GENERAL
SECTION
Part No.
3-318-203-51
3-358-363-11
3~914-938-01
3-318-203-72
3-914-939-01
3-$814-950-01
3-914-930-01
3-831-441-XX
3-914-948-11
3-914-947-11
3-914~-946-11
3-328-318-11
3-669-481-07
3-914-934-01
3-914-933-01
3-914-932-01
3-$14-879-01
SP901
6
Description
Remark
Ref.
No.
Part
No.
SCREW
(B1.
7X12),
TAPPING
18
X-3368-579-1
PLATE,
BLIND
19
3-914-931-01
KNOB
(PAUSE-~A)
(PAUSE)
20
3-914-936-01
SCREW
(B1.
7X5),
TAPPING
21
X-3368-568-1
KNOB
(FR)
21
X-3368-576-1
LID,
BATTERY
CASE
22
3-914-878-01
CUSHION
(BATTERY
CASE
LID)
23
3-914-952-01
SPACER,
KNOB
«
24
3-$14-949-01
BUTTON
(REC)
*
25
3-914-937-01
BUTTON
(PLAY)
26
3-318-382-31
BUTTON
(STOP)
*
27
A-3016-592-A
STRAP,
HAND
28
3-342-156-51
PIN
(DIA.
1X10),
PARALLEL
29
3-914-929-01
SPRING
(B),
BATTERY
COIL
*
30
3-914-S$58-21
TERMINAL (A), BATTERY
SPRING (C),
KNOB (VOR)
BATTERY COIL
—11—-—
MICS01 1-542-136-11
SP901 1-544-657-12
Remark
Description
CABINET (FRONT) (B3) ASSY
SPRING (TOGGLE), TORSION
ARM (EJECT-B)
LID (B2) ASSY, CASSETTE (M-677V)
LID (B1) ASSY, CASSETTE (M-627V)
KNOB (F-PB) (FAST PB)
COVER (AZIMUTH)
BRACKET (MICROPHONE)
CUSHION (MICROPHONE)
SCREW (1. 7X3), TAPPING
MAIN BOARD, COMPLETE
SCREW
PAPER, SHIELD
CABINET (REAR)
MICROPHONE, ELECTRET CONDENSER
SPEAKER (3. 6CM)

(2) MECHANISM SECTION
(MZ-627V-14)
Ref. No.
*
ol
02
33
04
59
36
37
58
09
60
61
62
63
64
65
66
67
M901
Part No. Description Remark
3-704-243-11 SCREW (P1. 7X2. 0)
3-914-920-01 PLATE (FR), LOCK
3-914-919-01 SLIDER (FR)
3-377-420-11 BELT
X-3368-702-1 FLYWHEEL (1.3) ASSY
3-914-903-01 SPRING (FR), TORSION
X-3368-486-1 LEVER (STOP) ASSY
3-914-906-01 SPRING (S. OFF), TORSION
3-914-915-01 ARM (S. OFF)
X-3368-582-1 REEL ASSY, T
3-343-948-01 BELT
1-548-579-21 COUNTER, TAPE (SMALL TYPE)
3-914-923-01 COVER, MD
3-366-892-11 SCREW (M1. 4X1. 4)
3-914-908-01 SPRING (REC LOCK), TENSION
X-3368-583-1 LEVER (REC) ASSY
3-703-816-82 SCREW (M1. 4X6.0), SPECIAL HEAD
Ref. No.
HCBS01
ad.
Part No. Description Remark
68
69
70
71
72
73
74
75
76
77
78
79
80
81
HCB901
M901
3-704-245-42 SCREW (P1. 4X3. 0)
3-378-792-01 SPRING, COMPRESSION
3-914-914-01 GUIDE, TAPE
3-914-913-01 LEVER (PLAY)
X-3368-585-1 PINCH LEVER ASSY
3-350-945-11 WASHER
3-914-902-01 SPRING (P), TORSION
3-914-904-01 SPRING (PFR), TORSION
X-3368-584-1 ARM (MIDWAY GEAR) ASSY
3-331-007-21 WASHER
3-914-916-01 ARM (CKAW DETECTION)
X~3368-587-1 REEL ASSY, S
3-914-907-01 SPRING (MIDWAY GEAR), TORSION
X-3368-701-1 CHASSIS (COMP.) ASSY (C), MECH
1-500-135-11 HEAD, MAGNETIC (REC/PB/ERASE)
1-698-384-11 MOTOR, DC