Sony TCM-900DV Service Manual ▷ View online
TCM-900DV
7
Tape Speed Adjustment
Procedure :
Procedure :
TP8(GND)
TP47
RV601
RV401
DPC (MANUAL) Adjustment
RV602
RV603
RV604
IC401
1
48
Tape Speed
Adjustment
Adjustment
[MAIN BOARD] (B side)
Adjustment Location : Main board (B side)
set
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
10k
Ω
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.
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
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.
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
TIME/DIV : 0.2
µsec
PB (DPC AUTO) mode
VOLT/DIV : 1 V AC
TIME/DIV : 1
TIME/DIV : 1
µsec
REC/PB mode
VOLT/DIV : 1 V AC
TIME/DIV : 10
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.
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.
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
• 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)
(
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.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
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
TIME/DIV : 0.2
µsec
SECTION 4
DIAGRAMS
1
T101
REC mode
VOLT/DIV : 5 V AC
TIME/DIV : 5
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
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
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
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
PIC
OSC
BIAS
Q105
+B
Q401
PB/REC
SWITCH
SWITCH
(PWR)
+B
(PWR)
SWITCH
Q112
GAIN
GAIN
MOTOR
BRAKE
BRAKE
SWITCH
INITIAL
Q603,608
Q601
MOTOR
BRAKE
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
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
OUT
IN2
PWR
OUT2
OUT2
IN1
PWR
OUT1
+
+
REF.
+
-
-
+
POWER OUTA
POWER OUTB
POWER +INA
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
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
PIC
RV301-1
RV301-2
Q702
Q701
RESET
Q108
POWER
(3.6V)
EVR
+B
(+3.6V)
D801
• Signal path.
E
: PB
a
: REC
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