Sony TCM-900-DV Service manual
TCM-900DV
SERVICE MANUAL
Ver 1.0 2001.02
SPECIFICATIONS
US Model
Canadian Model
AEP Model
Tourist Model
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MT-900-175
Recording system
2-track 1 channel monaural
Tape speed
4.8 cm/s or 2.4 cm/s
Frequency range
150 - 6 300 Hz using nomal (TYPEI) cassette
(with REC TIME switc hat “NORMAL”)
Speaker
Approx. 3.6 cm (1 7/16 in.) dia.
Power output
250 mW (at 10 % harmonicdistortion)
Input
Microphone input jack (minijack)
sensitivity 0.12 mV for 3 kilohms or lower impedance
microphone
Output
Earphone jack (minijack) for 8 -300 ohms earphone
Variable range of the tape speed
From approx. +100% to –50% (with
REC TIME switch at “NORMAL”)
From approx. +100% to –30% (with
REC TIME switch at “DOUBLE”)
Variable range of pitch control variation
Approx. +1 octave to –1 octave
Power requirements
3 V DC batteries R6 (AA) x 2
External DC 3 V power sources
Dimensions (w/h/d) (incl. projecting
parts and controls)
Approx. 86.7 x 112.8 x 35.7 mm
(3 1/2 X 4 1/2 X 1 7/16 in.)
Mass
Approx. 200g (7.1 oz.)
Supplied accessories
Headphones with remote control (1)
R6 (size AA) batteries (2)
(“Sony World Model” only)
Carrying pouch (1)
Design and specifications are subject
to change without notice.
9-873-082-11
2001B0200-1
© 2001.2
CASSETTE-CORDER
Sony Corporation
Audio Entertainment Group
General Engineering Dept.
TCM-900DV
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 dam-
aged by heat.
TABLE OF CONTENTS
Specifications ........................................................................... 1
1. GENERAL
Location of Parts and Controls .......................................... 2
2. DISASSEMBLY
2-1. Cabinet (Rear), Cassette Lid ASSY............................ 3
2-2. Main Board ................................................................. 4
2-3. Mechanism Deck ........................................................ 4
2-4. Belt (AR), M601 (Capstan/reel motor),
HRPE901 (REC/PB/ERASE head) ........................... 5
2-5. SW Board ................................................................... 5
3. ADJUSTMENTS
3-1. Mechanical Adjustments............................................. 6
3-2. Electrical Adjustments ................................................ 6
4. DIAGRAMS
4-1. Block Diagrams -Main Section (1/2) - ....................... 9
4-2. Block Diagrams -Main Section (2/2) - ..................... 10
4-3. Schematic Diagram - Main Section (1/3) - ................ 11
4-4. Schematic Diagram - Main Section (2/3) - ............... 12
4-5. Schematic Diagram - Main Section (3/3) - ............... 13
4-6.Printed Wiring Boards -Main Section (side A)- ........ 14
4-7.Printed Wiring Boards -Main Section (side B)- ........ 15
4-8.Printed Wiring Boards -SW Section (side A)- ........... 16
4-9.Printed Wiring Boards -SW Section (side B)- .......... 17
4-10.Schematic Diagram - SW Section - ......................... 18
4-11.Explanation of IC Terminals .................................... 19
Location of parts and controls
5. EXPLODED VIEWS
5-1. Main Board, Cabinet (Rear) section ......................... 22
5-2. Cassette Lid Section ................................................. 23
5-3. Mechanism deck Section -1(MT-900-175) ............... 24
5-4. Mechanism deck Section -2 (MT-900-175) .............. 25
6. ELECTRICAL PARTS LIST ................................ 26
SECTION 1
GENERAL
This section is extracted from
instruction manual.
2
SECTION 2
)
d
DISASSEMBLY
• The equipment can be removed using the following procedure.
TCM-900DV
Set
Cabinet (front)
Cassette lid assy
Main board
SW board
Mechanism deck
Cabinet (Rear)
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (REAR), CASSETTE LID ASSY
Cassette lid assy
Lever ASSY, FWD return
7Slide the projection
of "lever ASSY, FWD
return" fully in the
arrow direction and
remove it.
Belt (AR), M601 (Capstan/reel motor),
HRPE901 (REC/PB/ERASE head)
8Spring (toggle)
Note on installing the
cassette lid assy
Install the cassette lid assy with
the spring(toggle) as shown in
the figure so that it fits into the
holes on the cassette lid assy.
5Open
2Screws (+B1.7X 9)
9
4
1Screws (+B1.7X 9)
6SW flexible board (Main board:CN901
Cabinet (front)
3Claws
Cabinet (Rear)
Hand strap
Note on installing the SW flexible board
Insert the SW flexible board as shown
in the figure.
Cassette lid ASSY
SW flexible boar
3
TCM-900DV
)
k
2-2. MAIN BOARD
2Flexible board
( from HPR901/HE901)
Cabinet (front)
6
Main board
2-3. MECHANISM DECK
1Screws ( IB LOCK )
5Screws (M1.4)
Red
Black
Orange
White
1Remove soldering
four lead wires (from M601
4Spring, ground
3Screw
Cabinet (front)
2
Mechanism dec
( MT-900-175)
4
2-4. BELT (AR), M601 (CAPSTAN/REEL MOTOR),
d
HRPE901 (REC/PB/ERASE head)
7Fly ASSY,Capstan
7Fly ASSY,Capstan
z
Attaching belt (AR)
TCM-900DV
0HRPE901
(REC/PB/ERASE head)
2-5. SW BOARD
8Washer
9Screws (M1.4)
6Washer
5Washer (stopper N)
6Washer
5Washer (stopper N)
1Belt (AR)
8Washer
4Pulley (reverse)
2Screws (M1.4)
3M601 (Capstan/reel motor)
Cassette lid assy
5Flexible board
( from LCD901)
Lead wires ( from MIC901)
4Remove solder ( two places)
Lever assy, FWD return
6
2
Lead Wires (from SP901)
3Remove solder ( two places)
SW board
Cover, cassette li
1Screws (+B1.7X 3)
5
TCM-900DV
r
SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS
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 demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
6. Power supply voltage : 3V DC.
Torque Measurement
Mode Torque Meter Meter Reading
1.97 to 3.92 mN • m
/Reverse
Forward CQ-102C
Forward CQ-102C
Fast Forward
and Rewind
CQ-201B (50 g • cm)
Tape Tension Measurement
Mode Tension Meter Meter Reading
Forward CQ-403A
(20 to 40 g • cm)
(0.28 to 0.55 oz• inch)
0.05 to 0.49 mN • m
(0.5 to 5.0 g • cm)
(0.007 to 0.07 oz• inch)
more than 4.90 mN • m
(0.7 oz• inch)
more than 50g
( 1.77oz)
3-2. ELECTRICAL ADJUSTMENTS
• Standard Level
Input signal level MIC – 60dBs
Output signal level EAR (EARPHONE) 1.6kΩ, –22,4dBs
• Test Tape
Type Signal Used for
WS-48A 3kHz, 0dB tape speed adjustment
0dB=0.775V
Setting :
VOL Control (RV301) : mechanical mid
REC TIME (S903) : normal(4.8cm/s)
SPEED CONTROL (RV901): normal (center click)
DPC(MANUAL) Adjustment
Note: Adjust before the tape speed adjustment
Setting :
DPC(S904) switch : MANUAL
Tape speed : 4.8cm/s
Mode : PLAY
Procedure :
[MAIN BOARD](SIDE B)
C407
R406
24
20
IC401
35
40
37 45
TP82
C413
15
C412
R402
13
48
R401
12
10
5
1
R405
R404
R403
R416
R417
C422
C420
C410
C415
C416
frequency counte
TP47
C414
TP8(GND)
TP47
TP51
RV401
R407
25
C401
30
TP63
04
C403
36
L401
TP46
C402
+
–
1. Connect the freguency counter to TP47 and TP8(GND).
2. Adjust RV401 so that the freguency at TP47 becomes 220 Hz.
Standard value : 117 to 223 Hz
Adjustment Location : Main board (See page 7)
6
Tape Speed Adjustment
Procedure :
Note: Adjust on both sides DIR switch (S701) “ b “ and “ B “.
TCM-900DV
test tape
WS-48A
(3kHz, 0dB)
set
EAR (earphone) jack (J102)
digital frequency
counter
10kΩ
1. Set DPC switch (S904) to OFF, PITCH CONTROL switches
(S910, 911) to the center and play the test tape WS-48A.
2. Set REC TIME switch (S903) to NORMAL (4.8cm/s) and turn
SPEED CONTROL knob (RV901) fully to FAST.
3. Adjust RV601 so that the reading on the frequency counter
becomes 6000Hz.
4. Turn SPEED CONTROL knob (RV901) to the center and adjust
RV602 so that the reading on the frequency counter becomes
3010Hz.
5. Set REC TIME switch (S903) to DOUBLE (2.4cm/s) and turn
SPEED CONTROL knob (RV901) fully to the center.
6. Adjust RV603 so that the reading on the frequency counter
becomes 1505Hz.
7. Turn SPEED CONTROL knob (RV901) fully to SLOW.
8. Adjust RV604 so that the reading on the frequency counter
becomes 1050Hz.
9. Turn SPEED CONTROL knob (RV901) fully to FAST and
confirm the reading on the frequency counter becomes approx.
3010Hz.
10. Set REC TIME switch (S903) to NORMAL (4.8cm/s) and turn
SPEED CONTROL knob (RV901) fully to SLOW.
11. Confirm the reading on the frequency counter becomes approx.
1505Hz.
Adjustment Location : Main board (B side)
[MAIN BOARD] (B side)
TP8(GND)
DPC (MANUAL) Adjustment
RV401
Tape Speed
Adjustment
TP47
IC401
1
48
RV601
RV602
RV603
RV604
7
TCM-900DV
Note on Schematic Diagram: MAIN SECTION
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
specified.
f
•
• C : panel designation.
Note: Note:
• : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 3V and fed with regulated dc power
• Voltages and waveforms are dc with respect to ground
• Voltages are taken with a VOM (Input impedance 10 MΩ).
• Waveforms are taken with a oscilloscope.
• Signal path.
: internal component.
The components identi- Les composants identifiés
fied by mark 0 or dotted par une marque 0 sont cri line with mark 0 are cri- tiques pour la sécurité.
tical for safety. Ne les remplacer que par
Replace only with part une piéce portant le
number specified. numéro spécifié.
supply from battery terminal.
under no-signal conditions.
no mark : PLAY (DPC OFF)
( ) : REC
< > : PLAY (DPC AUTO)
Voltage variations may be noted due to normal production tolerances.
Voltage variations may be noted due to normal production tolerances.
E : PB
a : REC
4
W or less unless otherwise
SECTION 4
DIAGRAMS
z
Waveforms
– MAIN SECTION (2/3) –
1
IC701 wh
– MAIN SECTION (1/3) –
2
IC301 ql
– MAIN SECTION (3/3) –
3
REC/PB mode
3.8 Vp-p
0.25 µsec
VOLT/DIV : 1 V AC
TIME/DIV : 0.2 µsec
PB mode
3.6 Vp-p
0.25 µsec
VOLT/DIV : 1 V AC
TIME/DIV : 0.2 µsec
PB (DPC AUTO) mode
µ
sec
1.30
IC401 ej
– SW SECTION –
REC/PB mode
4
25 µsec
IC901 2
REC mode
5
20.0 µsec
3.8 Vp-p
VOLT/DIV : 1 V AC
TIME/DIV : 1 µsec
3.6 Vp-p
VOLT/DIV : 1 V AC
TIME/DIV : 10 µsec
30 Vp-p
T101 wh
VOLT/DIV : 1 V AC
TIME/DIV : 0.2 µsec
8
4-1. BLOCK DIAGRAMS – MAIN SECTION (1/2) –
TCM-900DV
MIC901
FLAT MIC
J101
MIC
(PLUG IN POWER)
HRPE901
RECORD/
PLAYBACK/
ERASE
HEAD
L
FWD
R
R
REV
L
FWD
REV
S101-4
REC
PRE AMP
MIC
POWER
ATT
Q104
Q111
S102-1
FWD
REV
S101-3
PB
T101
S102-2
BIAS
Q105
FWD
REV
OSC
Q107
PB
REC
S101-2
PB
REC
RF OUT
PRE +IN
RIPPLE
FILTER
+
PRE
AMP
-
RF IN
PRE OUT
PRE IN
+B
(PWR)
Q112
GAIN
SWITCH
S101-1
PB
REC
Q402
Q401
PB/REC
SWITCH
X401
768kHz
LPF1I
XTLO
XTLI
CP IN
CP REF
LPF
COMP
LPF1O
DATA RAM
TIMING
CP OUT
OSC
RESETN
A IN
DIGITAL
PITCH CONTROL
D/A
A/D
DSP
KEY SHIFT
CONTROL
MICOM IF
MODE
REGISTOR
MIN
A OUT
AUT
MODE
REGISTOR
BUF IN
FIN
FXIN
BUF OUT
OSC1I
OSC1O
OSC2I
LPF21
OSC2O
LPF
LPF20
MOD0
MOD1
MOD2
MOD3
Q404
Q403
Q405
+1.8V REG
RV601
TAPE
SPEED
9.6cm/s
RV602
TAPE
SPEED
4.8cm/s
RV603
TAPE
SPEED
2.4cm/s
RV604
TAPE
SPEED
1.6cm/s
POWER
(+3.6V)
SPEED CONTROL
SPEED CONTROL
SPEED CONTROL
Q607
Q109
Q101
POWER
(+3.6V)
S901
MIC SENS
L
REC
PIC
H
RV901
SPEED CONTROL
BIAS
SWITCH
Q106
+1.8V
REG
SPEED CONTROL
+B
(PWR)
Q606
IN+
S/S
SERVO
CONTROL
BIAS/
OSC
OSC
COM
PIC RST
SPEED CTL
WAVEFORM
DETECT
VSP
PIC CTL
SOFT
SWITCH
SYSTEM
CONTROL
C1
PIC M
OUT
CURRENT
DETECT
SPEED
DETECT
PRE
DRIVE
OUTPUT
MOTOR CTL
UOUT
VOUT
WOUT
RV401
DPC
Q604
INITIAL
SWITCH
Q603,608
MOTOR
BRAKE
Q601
+B
(BATT)
MOTOR
BRAKE
Q602
COM
U
V
W
M601
MOTOR
• Signal path.
E : PB
a : REC
99
TCM-900DV
4-2. BLOCK DIAGRAMS – MAIN SECTION (2/2) –
RIPPLE
FILTER
Q201
+B(BATT)
PH701
REEL ROTATE
DET
RESET
Q701
REP ON
PHOTO IN
RESET
X301
4MHz
Q301
LIN
XT
XT
A/D
TIMING
OSC
RESET
REP RST
IC REPEAT
ADPCM
ANALIZER
SYNTHESIZER
MUC I/F
SK
BUSY
REP BUSY
LCD REP SCLK
EVR
SO
SI
CS
REP CS
REP SI
LCD/REP DATA OUT
RAM
AOUT
D/A
SYSTEM
CONTROL
5
MUTE
Q307
POWER
(+3.6V)
REPEAT,
QUE/REV BEEP OSC
Q302-305
POWER
(3.6V)
REP QUE/REV
AMP
Q306
(FF/REW)
S702
VCC
POWER AMP
VOR
RV301-2
VOL
1
Q103
AMP
ATT
Q501
IN1
INV
OUT
IN2
STBY
ALC IN
POWER +INA
POWER -INA
POWER -INB
POWER +INB
Q113
7
ATT
MUTE
Q110
SW
Q102
MUTE CTL
REC
PIC
Q115
Q108
REC CTL
PIC ON/OFF
VOR IN
RV301-1
Q114
SP SW
AMP
3
Q202
REF
RIPPLE
FILTER
+
+
PRE AMP,
POWER AMP
ALC
+
-
-
+
REF.
POWER
AMPA
POWER
AMPB
PWR
OUT1
PWR
OUT2
POWER OUTA
POWER OUTB
J102
EAR
SP901
(SPEAKER)
ON
S902
VOR SW
OFF
S903
REC TIME
DOUBLE
KEY MATRIX
S905-911
TAPE SPEED SW
(+3.6V)
NORMAL
+B
AUTO
S904
DPC
MANUAL
DPC SW
OFF
KEY IN
AKE UP
W
Q702
LCD
DRIVER
LCD CS
CS
COM1-4
11
-
SO
SEG1-18
14
LCD901
LIQUID
CRYSTAL
DISPLAY
POWER
SCK
15
(3.6V)
CD
OSC1
OSC2
-
(3.6V)
32
B+
S701
(F/R GEAR)
D901
REC
10 10
F/R GEAR
X2
X701
4MHz
X1
JACK DET
POWER
+3.6V
+B
(PWR)
+B
(PIC)
+B
(+3.6V)
LED DRIVE
Q503
+B SWITCH
Q801-802
AMP
+
Q502
+3.6V REG
+3.6V REG
D803
S801
POWER
DC-DC
CONVERTOR
D801
+B
(BATT)
L801
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
2PCS, 3V
J801
DC IN 3V
• Signal path.
E : PB
a : REC
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