Sony Pressman TCM-929 User manual

TCM-929/939
TCM-929
Canadian Model
AEP Model
UK Model
E Model
Australian Model
TCM-939
Photo: TCM-939
TCM-919
MT-929
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
SPECIFICATIONS
Recording system
2-track 1 channel monaural
Frequency range
150 - 8,000 Hz
Speaker
Approx. 6.6 cm (2% in.) dia.
Power output
400 mW (at 10 % harmonic distortion)
Input
Microphone input jack (minijack) sensitivity 0.775 mV for low
impedance microphone
Output
Earphone jack (minijack) for 8 - 300 ohms earphone
Power requirements
¢ Four size AA (R6) batteries (not supplied): 6V DC
¢DC IN 6 V jack accepts:
Supplied AC power adaptor suitable in the country where the unit
is to be used.
Dimensions (w/h/d) (incl. projecting parts and controls)
Approx. 144 x 60 x 237 mm
5%A~x2%x9I ¥%in.)
Mass (not incl. batteries)
Approx. 675 g (23.9 oz.)
Supplied accessories
AC power adaptor (1)
(US, Canadian and European model only)
Design and specifications are subject to change without notice.
CASSETTE CORDER
SONY.

SECTION 1
This section is extracted from
instruction manual.
Recording
You can record right away with the built-in microphone.
Make sure that nothing is connected to the MIC jack.
TAPE COUNTER and
counter reset button
@ REC
mA STOP/
EJECT
Il PAUSE
1 Press the counter reset button to reset the TAPE COUNTER.
2 Press §& STOP/EJECT to open the cassette holder.
3 Insert a TYPE | (normal) tape with the side to start recording
facing upward, and close the cassette holder.
4 Press @ REC.
- PLAY is depressed automatically.
At the end of the tape, recording stops and the unit turns off
automatically.
To Press
Stop recording M+ STOP/EJECT
Pause recording ti PAUSE
Press the button again to resume recording.
Notes
* You cannot monitor the recording sound.
* For recording, we recommend the use of TYPE I (normal) tapes only. Do
not use TYPE II (CrO2) and TYPE IV (metal) tapes.
Recording with an External Microphone
MIC (PLUG IN POWER)
Connect a microphone of low impedance (not supplied) to the MIC
jack. The built-in microphone is automatically disconnected.
When using a plug-in-power system microphone, the power to the
microphone is supplied from this unit.
GENERAL
Playing a Tape
EAR
bP FF/CUE
<4 REW/REVIEW
p>
PLAY
ms
STOP/
EJECT
Ii PAUSE
VOL
(volume)
1 Press B& STOP/EJECT to open the cassette holder.
2 Insert a TYPE I (normal) tape with the side to start play facing
upward, and close the cassette holder.
3 Press B PLAY then adjust the volume.
At the end of the tape, playback stops and the unit turns off
automatically.
To Press or slide
m@@ STOP/EJECT
Stop playback/stop
fast forward or rewind
HE PAUSE
Press the button again to resume play.
Press and hold >» FF/CUE and release it at the
point you want
Press and hold << REW/REVIEW and release it
at the point you want
Pause playback
Search forward
during playback (CUE)
Search backward
during playback
(REVIEW)
Fast forward bP FF/CUE during stop
Rewind <4 REW/REVIEW during stop
At the end of the tape
All the locked buttons will be automatically released (Full auto
shut-offmechanism).
To listen with an earphone
Connect an earphone (not supplied) to the EAR jack of the unit.
The built-in speaker will be automatically disconnected.

SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
REAR CABINET
@ two screws (BVTP3 x Oe
@ Open the battery case lid.
@ three screws
«—— (BVTP3 x 10)
@ rear cabinet
8 handle
MAIN BOARD
© MAIN board
@ screw (BVTP3 X 8)
\
a
@ screw f JC \
(BVTP3 xX 8) VAL SNA
eo
;
aw
; me @ cord (from HRP101)
Z oe
oy @ MICi101
@ lug, 3
© three cord
(from $102, SP101, M901)

MECHANISM DECK
@ two screws @ spring
(BVTP3
xX
8)
ll
Note on engaging the counter belt
1. Engage temporarily the counter belt to the part @.
2. Install the mechanism deck.
3. . Engage the counter belt to the T reel assembly through
the hole marked with +4 on the front side of cabinet.
T reel assembly ae
CASSETTE LID
@ volume knob
® cassette lid
@ Open the cassette lid.

SECTION 3
ADJUSTMENTS
3-1.
MECHANICAL
ADJUSTMENT
Adjustment
Location:
Reel/Capstan
Motor
(M901)
PRECAUTION
1.
Clean
the
following
parts
with
a
denatured-alcohol-moistened
swab:
ro
6]
record/playback
head
pinch
roller
reel/capstan
motor
erase
head
rubber
belts
(M901)
capstan
Z. Demagnetize the record/playback head with a head demagnetizer.
Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the parts
adjusted.
C
)
5. The adjustments ahould be performed in the rated power supply
voltage unless otherwise noted.
w&
Torque
Measurement
tape
speed
adjustment
Torque
Torque
meter
Meter
reading
27
to
70
gecm
.
Pw)
CQ-102C
(0.37
to
0.98
ozeinch)
Record/Playback
Head
Azimuth
Adjustment
FWD.
1.5
to
5.5
gecm
gee
:
CQ-102C
07
ozei
Setting:
Back
tension
(0.02
to
0.07
ozeinch)
VOL
aanivale
ineohanice
aad?
80
to 156
gecm
FF,
REW
CQ-201B
:
.
(1.12
to
2.1
ozeinch)
Adjustment
Procedure:
1.
Mode:
Playback
3-2.
ELECTRICAL
ADJUSTMENTS
test
tape
P-4-A063
Tape Speed Adjustment (6.3 kHz, — 10 dB)
Setting:
—
|
set
=4
3
VOL
control:
mechanical
mid.
earphone jack
Adjustment Procedure:
1. Mode: Playback
speed checker 2. Turn the adjustment screw for maximum VTVM reading.
LFM-30 Note: Serval peaks may appear, but take the the maximum.
fecueney 3. After the adjustment, lock the screws with locking compound.
counter
WAGER Adjustment Location: Record/Playback Head
(3 kHz, 0 dB)
earphone jack
Specification:
Speed checker Frequency counter
2,910 to 3,090 Hz
adjustment screw

TCM-929/939
SECTION 4
DIAGRAMS
4-1. PRINTED WIRING BOARD
e Semiconductor
Location
Location
abe
$102
ae, ConeenSs REEL/CAPSTAN TC POWER SWITCH
MOTOR SP101
[ MAIN BOARD ] SPEAKER
J103
DRY BATTERY
SIZE “AA”
(IEC DESIGNATION Ré! (CHASSIS)
4pes-O¥ ae J102
ld :
ee 2
J101 |
PLUG IN POWER
is MIC101
=} MICROPHONE
~|O
>
11
118 1-658-146- }1(414)
HRP 101
PLAYBACK RECORD
HEAD
Note:
HE101
e o—-—:: parts extracted from the component side. ERASE HEAD
: Pattern on the side which is seen.

TCM-929/939
4-2. SCHEMATIC DIAGRAM
1
2
|
3
|
4
rs)
6
7
8
9g
10
11
12
en
rm
rrr
erm
rrr
ee
oe
A ' [ MAIN BOARD ]
TPtOS
103 R103
° wl 2.2K
J101 As
A iz |
PLUG
IN
POWER
Vhs)
[A
|
J102
EAR
B TP106
R101
18k =
I
SP101
SPEAKER
MIC1O1
Cc MICROPHONE TP1O1 Rize | Rize
&
|
£101
-
M901
x
(M)
REEL/CAPSTAN
104
R102
c
=
MOTOR
MTZJ-T-73-3.0 3. 3k ee
[Vote pow
0 e TC POWER
TP102 C133 PB—=REC SWITCH
D x S101-6
4 5
O in
TP105 C102 ae
HE101
190
2
(CHASSIS)
[==]
ERASE
HEAD
TP108
>
eval
=
5
:
LON
ose
f=)
© R104 oa oR + el axl LF J103
I 22k oS < eT LBF Te
: a 8 ~ | oe
3B
as
BC
IN
6V
HRP 101 ae
PLAYBACK/RECORA
HEAB
TOTAL
CURRENT
WHT
oy
PLAY:150mA
“[
7
oe
REC:150mA
“T
RED
FF:
125mA
TL
R108 6.8k Cllé + RI2 1 TP110 I REW:125mA
R106 eae TPitt
F 7.5k I
+
0.0047 X 4.7 S0V SIZE “AA‘
|
|
{TEC
BESIGNATION
Ré)
Note:
e All capacitors are in uF unless otherwise noted. pF: wuF
50 WV or less are not indicated except for electrolytics
and tantalums.
e All resistors are in Q and % W or less unless otherwise
specified.
° : B+ Line.
e Power voltage is de 6 V and fed with regulated dc power supply
from external power voltage jack.
e Voltages are de with respect to ground under no-signal
conditions.
no mark : PLAY
e Voltages are taken with a VOM (10 MQ/V).
Voltage variations may be noted due to normal! production
tolerances.
e Signal path.
>> : PB
—9— : 7 —10—

NOTE:
@ -XX and -X mean standardized parts, so they
may have some difference from the original
one.
@ Color Indication
Example:
KNOB, BALANCE (WHITE)... (RED)
fi t
of Appearance Parts
Parts Color Cabinet’s Color
(1) CABINET SECTION
Ref. No. Part No. Description
1 3-928-051-01 HANDLE
2 3-927-954-01 TERMINAL (+.-), BATTERY
* 3 A-3061-174-A MAIN BOARD, COMPLETE
4 3-927-955-01 LEVER, REC
* 5 3-348-316-01 CUSHION, MICROPHONE
6 3-927-963-01 BUTTON (PAUSE)
7 3-927-964-01 BUTTON (STOP)
8 3-927-965-01 BUTTON (FF)
9 3-927-966-01 BUTTON (REW)
10 3-927-967-01 BUTTON (PLAY)
11 3-927-962-01 BUTTON (REC)
12 3-927-969-01 LID, CASSETTE (929)
12 X-3370-892-1 LID ASSY, CASSETTE (939)
13 3-927-971-01 CABINET (FRONT)
14 3-927-956-01 SPRING (SPEAKER)
SECTION 5
EXPLODED VIEWS
@ Items marked “*” are not stocked since they e
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.
Remark Ref. No. Part No.
15 1-251-348-11 COUNTER,
Model name abbreviation
929: TCM-929
939: TCM-939
Description
TAPE
16 3-927-968-01 KNOB (VOL)
17 3-927-960-01 SPRING (CASSETTE)
23 3-928-052-01 DAMPER
29 3~930-740-01 CUSHION
18 3-927-957-01 BELT, COUNTER
19 3-927-958-01 TERMINAL (-), BATTERY
20 3-927-959-01 TERMINAL (+), BATTERY
21 3-927-961-01 LID, BATTERY CASE
22 3-927-970-01 CABINET (REAR) (929)
22 3-927-970-11 CABINET (REAR) (939: Canadian)
22 3-927-970-21 CABINET (REAR) (939: AEP, UK, E, Australian)
24 3-930-739-01 PLATE REINFORCE
MIC101 8-814-186-00 MICROPHONE, ELECTRET CONDENSER
SP101 1-504-970-11 SPEAKER (6. 6CM)

(2) MECHANISM DECK SECTION
(MT-929)
HRP101

Ref. No.
*
101
102
103
104
105
121
125
126
127
128
129
130
Part No. Description ~ Remark
3~363-230-01 LUG
3-362-985-01 SPRING
3-362-986-01 HOLDER, HEAD
3-362-983-01 SPRING
3-362-984-01 HEAD (BASE)
3-385-832-01 LINK, CR
3-362-982-01 PINCH ROLLER
3-362-981-01 PINCH ARM
3-362-980-01 WASHER
3-385-819-01 FRAME ASSY
3-385-831-01 ARM, CR
3-385-821-01 SPRING
3-385-820-01 PLATE, FUNCTION
3-385-822-01 LEVER, SW
3-362-947-01 LEVER, REC
3-362-954-01 SPRING
3-362-948-01 LEVER, PLAY
3-362-949-01 LEVER, REW
3-362-950-01 LEVER, FF
3-385-824-01 LEVER, SE
3-362-9$52-01 LEVER, PAUSE
3-362-953-01 ARM, PAUSE
3-362-957-01 SPRING
3-362-956-01 SPRING
3-362-955-01 SPRING
3-362-960-01 PULLEY, IDLER
3-362-959-01 ARM, IDLER
3-362-968-01 LEVER, EJECT
3-362-962-01 REEL ASSY, T
X-3363-611-1 REEL, S ASSY
Ref. No. Part No. Description Remark
*
131. = 3-362-965-01 IDLER, FF
132 3-362-961-01 SPINDLE (BASE)
133. 3-372-120-01 SPRING
134 3-362-941-01 CHASSIS
135. = 3-385-825-01 INTERLOCK
137: 3-362-967-01 SPRING, CASSETTE
138 = 3-362-971-01 SPRING
139 = 3-362-972-01 SENSOR
140 = 3-362-976-01 LEVER, CONTROL
141. = 3-362-975-01 LEVER, SENSOR
142 =. 3-362-977-01 SPRING
143. 3-362-978-01 SPRING, PLATE
144 3-362-973-01 AS (BASE)
145 = X-3363-315-1 GEAR, CAM ASSY
146 3-369-962-01 SPRING, COMPRESSION
147 ~—- 3-369-961-01 WASHER
148 =. 3-385-829-01 BELT
149 3-928-053-01 BELT (Y TYPE)
150 = 3-385-827-01 FW ASSY
151 = 3-362-970-01 SPRING
152 3-385-826-01 IDLER ASSY, PF
153 = 3-385-828-01 HOLDER, MOTOR
154 = 3-363-229-01 SCREW
155 = 3-385-830-01 SCREW
156 =. 3-362-958-01 SCREW
157 = 3-366-352-01 SCREW
HE101 1-500-009-11 HEAD, MAGNETIC (ERASE)
HRP101 1-543-410-11 HEAD, MAGNETIC (REC/PB)
M901 _X-3366-071-1 MOTOR ASSY (REEL/CAPSTAN)
$102 1-572-538-11 SWITCH, LEAF (TC POWER)