TCM-900DV - Sony Audio Service Manual (repair manual)

Model
TCM-900DV
Pages
32
Size
2.17 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
tcm-900dv.pdf
Date

View Sony TCM-900DV Service Manual online

Ver. 1.1  2007.01
TCM-900DV
SERVICE MANUAL
CASSETTE-CORDER
SPECIFICATIONS
US Model
Canadian Model
AEP Model
Tourist Model
9-873-082-12
2007A02-1
© 2007.01
Sony Corporation
Personal Audio Division
Published by Sony Techno Create Corporation
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.
2
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
SECTION 1
GENERAL
This section is extracted from
instruction manual.
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
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
Location of parts and controls
3
TCM-900DV
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
• The equipment can be removed using the following procedure.
Cassette lid assy
Cabinet (front)
SW board
Main board
Belt (AR), M601 (Capstan/reel motor),
HRPE901 (REC/PB/ERASE head)
Set
Mechanism deck
Cabinet (Rear)
2-1. CABINET (REAR), CASSETTE LID ASSY
Cassette lid assy
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.
7
Slide the projection 
    of "lever ASSY, FWD 
    return" fully in the 
    arrow direction and
    remove it.
8
Spring (toggle)
1
Screws (+B1.7X 9) 
2
Screws (+B1.7X 9) 
5
Open
Lever ASSY, FWD return
6
SW flexible board (Main board:CN901)
Hand strap
Cabinet (Rear)
3
Claws
4
9
Cabinet (front)
Cassette lid ASSY
SW flexible board
Note on installing the SW flexible board
Insert the SW flexible board as shown
in the figure.
4
TCM-900DV
2-2. MAIN BOARD
2-3. MECHANISM DECK
5
Screws (M1.4) 
6
Black
Main board
Orange
White
Red
2
Flexible board 
   ( from HPR901/HE901)
1
Remove soldering
    four lead wires (from M601)
4
Spring, ground
3
Screw
Cabinet (front)
1
Screws ( IB LOCK ) 
Mechanism deck
 ( MT-900-175)
Cabinet (front)
2
5
TCM-900DV
6
Washer 
5
Washer (stopper N) 
9
Screws (M1.4)
0
HRPE901
    (REC/PB/ERASE head)
6
Washer 
5
Washer (stopper N) 
3
M601 (Capstan/reel motor)
2
Screws (M1.4)
4
Pulley (reverse)
8
Washer 
8
Washer 
7
Fly ASSY,Capstan
7
Fly ASSY,Capstan
1
Belt (AR)
Attaching belt (AR)
z
2-5. SW BOARD
2-4. BELT (AR), M601 (CAPSTAN/REEL MOTOR),
       HRPE901 (REC/PB/ERASE head)
Cover, cassette lid
SW board
Lever assy, FWD return
Cassette lid assy
1
Screws (+B1.7X 3) 
Lead Wires (from SP901)
Lead wires ( from MIC901)
4
Remove solder ( two places)
3
Remove solder ( two places)
5
Flexible board 
          ( from LCD901) 
6
2
TCM-900DV
6
3-2. ELECTRICAL ADJUSTMENTS
• Standard Level
Input signal level
MIC
– 60dBs
Output signal level
EAR (EARPHONE)
1.6k
Ω, –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
Setting :
DPC(S904) switch
: MANUAL
Tape speed
: 4.8cm/s
Mode
: PLAY
Procedure :
[MAIN BOARD](SIDE B)
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)
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
Forward
CQ-102C
1.97 to 3.92 mN • m
(20 to 40 g • cm)
(0.28 to 0.55 oz• inch)
Forward
CQ-102C
0.05 to 0.49 mN • m
(0.5 to 5.0 g • cm)
(0.007 to 0.07 oz• inch)
Fast Forward
more than 4.90 mN • m
and Rewind
CQ-201B
(50 g • cm)
(0.7 oz• inch)
Tape Tension  Measurement
Mode
Tension Meter
Meter Reading
Forward
CQ-403A
more than 50g
( 1.77oz)
/Reverse
1
36
25
48
35
15
40
12
30
24
20
37
45
5
10
13
L401
IC401
R409
C420
C422
R417
R416
C416
R405
R402
R406
R407
RV401
C401
304
8
C410
C402
C403
C414
C415
R403
R404
R401
C412
C413
C407
TP46
TP82
TP47
TP51
TP63
+
frequency counter
TP47
TP8(GND)
Note: Adjust before the tape speed adjustment
TCM-900DV
7
Tape Speed Adjustment
Procedure :
TP8(GND)
TP47
RV601
RV401
DPC (MANUAL) Adjustment
RV602
RV603
RV604
IC401
1
48
Tape Speed
Adjustment
[MAIN BOARD] (B side)
Adjustment Location : Main board (B side)
set
test tape
WS-48A
(3kHz, 0dB)
10k
EAR (earphone) jack (J102)
digital frequency 
counter
Note: Adjust on both sides DIR switch (S701) “ b  “ and “ B “.
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.
TCM-900DV
8
z
 Waveforms
2
4
5
IC301   ql
IC401   ej
IC901   2
PB mode
VOLT/DIV : 1 V AC
TIME/DIV : 0.2 
µsec
PB (DPC AUTO) mode
VOLT/DIV : 1 V AC
TIME/DIV : 1 
µsec
REC/PB mode
VOLT/DIV : 1 V AC
TIME/DIV : 10 
µsec
– MAIN SECTION (1/3) –
– MAIN SECTION (3/3) –
– SW SECTION –
– MAIN SECTION (2/3) –
3.6 Vp-p
0.25 
µsec
3.8 Vp-p
1.30 
µsec
25 
µsec
3.6 Vp-p
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
/
4
 
W or less unless otherwise
specified.
f
: internal component.
• C : panel designation.
 Note:
 Note:
 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.
: B+ Line.
• H : adjustment for repair.
• Power voltage is dc 3V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : PLAY (DPC OFF)
(
)
: REC
<
>
: PLAY (DPC AUTO)
• Voltages are taken with a VOM (Input impedance 10 M
Ω).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
E
: PB
a
: REC
3.8 Vp-p
0.25 
µsec
3
IC701   wh
REC/PB mode
VOLT/DIV : 1 V AC
TIME/DIV : 0.2 
µsec
SECTION 4
DIAGRAMS
1
T101
REC mode
VOLT/DIV : 5 V AC
TIME/DIV : 5 
µsec
30 Vp-p
20.0 
µsec
9
9
TCM-900DV
4-1. BLOCK DIAGRAMS – MAIN SECTION (1/2) –
MIC901
S901
J101
RV401
T101
X401
Q111
Q101
RV601
RV602
RV603
RV604
M601
RV901
DPC
768kHz
MOTOR
FLAT MIC
MIC SENS
L
H
SPEED CONTROL
L
R
R
FWD
REV
RECORD/
FWD
REV
PB
REC
FWD
REV
FWD
REV
PB
REC
PB
REC
-
+
PRE +IN
PRE
AMP
RIPPLE
FILTER
PRE OUT
PRE IN
RF OUT
RF IN
PB
REC
MIN
LPF20
LPF21
A IN
BUF OUT
BUF IN
A OUT
OSC1I
FIN
CP OUT
CP IN
CP REF
XTLO
XTLI
RESETN
LPF1I
LPF1O
MOD0
MOD1
MOD2
MOD3
FXIN
OSC1O
OSC2I
OSC2O
SPEED CTL
PIC M
C1
PIC CTL
MOTOR CTL
PIC RST
OUT
VSP
IN+
S/S
COM
OSC
UOUT
VOUT
WOUT
L
HRPE901
HEAD
ERASE
PLAYBACK/
S102-2
S101-4
S102-1
S101-3
MIC
(PLUG IN POWER)
MIC
POWER
Q107
ATT
Q104
S101-2
BIAS
SWITCH
Q106
+1.8V
REG
S101-1
DIGITAL
PITCH CONTROL
D/A
A/D
LPF
LPF
DATA RAM
DSP
KEY SHIFT
CONTROL
TIMING
OSC
MICOM IF
MODE
REGISTOR
AUT
MODE
REGISTOR
COMP
Q405
Q403
Q404
SYSTEM
CONTROL
DETECT
SPEED
CURRENT
DETECT
DRIVE
PRE
OUTPUT
BIAS/
OSC
WAVEFORM
DETECT
SOFT
SWITCH
CONTROL
SERVO
+B
(BATT)
SPEED CONTROL
SPEED CONTROL
SPEED CONTROL
SPEED CONTROL
POWER
(+3.6V)
PRE AMP
REC
PIC
OSC
BIAS
Q105
+B
Q401
PB/REC
SWITCH
(PWR)
+B
(PWR)
SWITCH
Q112
GAIN
MOTOR
BRAKE
SWITCH
INITIAL
Q603,608
Q601
MOTOR
BRAKE
Q602
Q109
Q607
Q606
Q604
Q402
TAPE
SPEED
TAPE
SPEED
TAPE
SPEED
TAPE
SPEED
9.6cm/s
4.8cm/s
2.4cm/s
1.6cm/s
POWER
(+3.6V)
+1.8V REG
COM
U
V
W
• Signal path.
E
: PB
a
: REC
TCM-900DV
10
10
4-2. BLOCK DIAGRAMS – MAIN SECTION (2/2) –
S902
S903
S904
J102
S701
J801
S801
Q306
Q113
Q114
Q115
Q103
Q202
D803
PH701
X301
X701
S702
Q301
L801
D901
SP901
(F/R GEAR)
POWER
REEL ROTATE
DET
4MHz
4MHz
(FF/REW)
(SPEAKER)
DPC
AUTO
MANUAL
OFF
REC TIME
NORMAL
DOUBLE
OFF
ON
REC
OSC2
SCK
SO
CS
CD
LCD
DRIVER
COM1-4
SEG1-18
DISPLAY
LIQUID
CRYSTAL
(3.6V)
B+
OSC1
LIN
AOUT
XT
XT
BUSY
SK
SO
SI
CS
STBY
INV
OUT
IN2
PWR
OUT2
IN1
PWR
OUT1
+
+
REF.
+
-
-
+
POWER OUTA
POWER OUTB
POWER +INA
POWER -INA
POWER +INB
POWER -INB
POWER
AMPA
POWER
AMPB
ALC
ALC IN
REP RST
REP CS
REP BUSY
REC CTL
REP ON
F/R GEAR
SW
VOR IN
DPC SW
JACK DET
PHOTO IN
TAPE SPEED SW
KEY IN
SP SW
W
AKE UP
VOR SW
LCD/REP DATA OUT
REP SI
LCD REP SCLK
LCD CS
PIC ON/OFF
X1
X2
RESET
REP QUE/REV
MUTE CTL
DRY BATTERY
SIZE "AA"
2PCS, 3V
(IEC DESIGNATION R6)
DC IN 3V
+
RESET
LCD901
VOL
-
-
11 14
15 32
IC REPEAT
A/D
TIMING
OSC
MUC I/F
RAM
ADPCM
ANALIZER
SYNTHESIZER
D/A
AMP
Q302-305
REPEAT,
QUE/REV BEEP OSC
MUTE
Q307
POWER
(+3.6V)
7
5
MUTE
ATT
Q102
Q110
AMP
3
1
POWER AMP
FILTER
RIPPLE
REF
VCC
FILTER
RIPPLE
+B(BATT)
Q201
PRE AMP,
POWER AMP
EAR
SYSTEM
CONTROL
POWER
(3.6V)
KEY MATRIX
S905-911
+3.6V REG
+3.6V REG
DC-DC
CONVERTOR
+B
(BATT)
+B
+B
+B
+3.6V
POWER
(+3.6V)
(PIC)
(PWR)
+B SWITCH
Q801-802
ATT
Q501
AMP
Q502
LED DRIVE
Q503
VOR
AMP
REC
PIC
RV301-1
RV301-2
Q702
Q701
RESET
Q108
POWER
(3.6V)
EVR
+B
(+3.6V)
D801
• Signal path.
E
: PB
a
: REC

Download Sony TCM-900DV Service Manual (Repair Manual)

Here you can view online and download Sony TCM-900DV Service Manual in PDF. TCM-900DV service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony TCM-900DV Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.