Toshiba Dvr4xsu Owners Manual

TROUBLESHOOTING GUIDE
E-15
D-VR4XSU/D-VR4XSC
NO YESYES NO AT PLAYBACK, THE COLOR DOES
NOT APPEAR
Is there color signal in
video signal at pin 26 of
IC101 ?Is there video signal at pin
26 of IC101 ?Change X101.
Change IC101.
YESNO Is there color signal in
video signal at pin 49 of
IC3001 ?Change IC3001.
YESNO Is there color signal in
video signal at pin 30 of
IC8301 ?Change IC8301.
Check at pin 5 of J8005
and peripheral circuit. 

TROUBLESHOOTING GUIDE
E-16
D-VR4XSU/D-VR4XSC
YES
NO PLAYBACK PICTURE IS NOISY
(EVEN AFTER CLEANING HEADS)
Is noisy a wave of video
signal at pin 26 of IC101 ?Check CYLINDER.
YES
NO Is noisy a wave of video
signal at pin 49 of IC3001
?Change IC3001.
YES
NO Is noisy a wave of video
signal at pin 30 of IC8301 ?Change IC8301.
Check J8005 at pin 5
and peripheral circuit. 

TROUBLESHOOTING GUIDE
E-17
D-VR4XSU/D-VR4XSC
YES YES
NO NO NO COLOR DURING SELF
RECORDING AND PLAYBACK
Is there CHROMA signal at
pin 30 of IC101 ?Check TU301, J8002, J603,
IC8301 and circuit around it.
Is there CHROMA signal at
pin 26 of IC101 ?
Refer to AT PLAYBACK, THE
COLOR DOES NOT APPEAR.Change IC101. 

TROUBLESHOOTING GUIDE
E-18
D-VR4XSU/D-VR4XSC
YESYES YES
NONO NO AT PLAY, AUDIO (MONO)
DOES NOT APPEAR
At E-E, does audio appear ?Refer to section
AT E-E NO SOUND.
Is the voltage at pin 6 of
IC101 about 2.5V ?Check A/C HEAD.
Change IC101 and check
peripheral circuit of pin 10
of IC101. Is there audio signal at pin
10 of IC101 ?
Check whether there are not a
damage, dirt in AUDIO HEAD and
peripheral circuit of pin 62 of IC701. 

TROUBLESHOOTING GUIDE
E-19
D-VR4XSU/D-VR4XSC
YESYES
NO NO CAPSTAN DD MOTOR NOT
ROTATING
Check POWER BLOCK.
Change IC3001. In playback, is there voltage
at pin 32 of IC3001 2.5V ?
DD MOTOR rotate now ?
If not, replace it.
In playback, is there voltage
at pin 2 of CP3001 12V ? 

TROUBLESHOOTING GUIDE
E-20
D-VR4XSU/D-VR4XSC
YES YESYES
YESNONO
NO
NO THE AUDIO CAN NOT
RECORD
Is bias level at L101 OK?In starting recording,
is there sine wave at
pin 11 of IC101 ?Check POWER BLOCK and
voltage of base of Q103.
Check disconnection
and short of L101.
Is there audio signal at
pin 76, 78 and 80 of
IC101 ?Check IC701 and
the circuit from TUNER
or audio input jack to IC701 .
Change L101. Is there a sine wave
at pin 5 of L101 ?
Check lead wire of A/C HEAD
and CONNECTOR. 

TROUBLESHOOTING GUIDE
E-21
D-VR4XSU/D-VR4XSC
YESYES
NO NO THE CASSETTE INSERT, BUT
THE TAPE DOES NOT MOVE
Does the mode
appear at display ?
Does operate with
 remote control ?
Check operation PCB.Check LOADING MOTOR
and MODE SENSOR
RELATION DEPARTMENT.
Check IC3001. 

TROUBLESHOOTING GUIDE
E-22
D-VR4XSU/D-VR4XSC
YESYES
YESYES NO
NONO
NO RECORDING MECHANISM WORKS,
BUT NO VIDEO RECORD FROM
INPUT JACK OR TUNER
Is there video signal at
pin 30 of IC 101 ?
Is the BASE of
Q103 5V ?
Is the voltage at pin 94
of IC3001 5V ?Check IC8301 and peripheral
circuit or TUNER to IC8301.
Change IC3001.
Change IC101. Is there video signal
at pin 26 of IC101 ?
Check CYLINDER UNIT and
circuit around of CP101. 

TROUBLESHOOTING GUIDE
E-23
D-VR4XSU/D-VR4XSC
YES
YES
YESYES NO
NO
NONO AT E-E, NO SOUND
Does normality AUDIO
JACK CONNECT ?Connection is done over again.
Is there audio signal at
pin 53 and 57 of IC701 ?Check J8005 and peripheral
circuit.
Change IC701.
Is there audio signal at
pin 9 and 14
 of IC701?Check J8002, J601, J602,
IC8301 and peripheral circuit. Is there audio signal of
J8005 at pin 2 and 3 ? 

TROUBLESHOOTING GUIDE
E-24
D-VR4XSU/D-VR4XSC
YES YES
YESYES YESNO
NO NO NONO E-E AUDIO (MONO)
DOES NOT APPEAR
Does E-E AUDIO
(STEREO) appear ?
Is the voltage at pin 77
of IC101 5V ?Refer to section E-E AUDIO
(STEREO) DOES NOT APPEAR.
Check POWER BLOCK.
Is the voltage at pin 94 of
IC3001 5V ?Change IC3001.
Check IC8301, J8002 and
J602.
Change IC701. Is there audio signal  at
pin 14 of IC701 ?
Is there audio signal at
pin 61 of IC701 ?
Check circuit around of J8005.