Toshiba Dvr4xsu Owners Manual

TROUBLESHOOTING GUIDE
E-5
D-VR4XSU/D-VR4XSC
Check LED of DECK,
PHOTO SENSOR.
Change
LOADING MOTOR.
The CASSETTE TAPE
CAN NOT BE INSERTED
Check WORM GEAR
of cassette loading block.
YES
YES
YESNO
NO
NO Does WORM GEAR of
cassette loading block
move ?
When a CASSETTE can
not inserted, is pin 79 of
IC3001 5V ?
When a CASSETTE is
inserted, is pin 8 of
CP3001 12.6V ?
Check circuit of POWER BLOCK. 

TROUBLESHOOTING GUIDE
E-6
D-VR4XSU/D-VR4XSC
Check IC3001. Does another CASSETTE
insert ?
Check SW3001.
Defective CASSETTE
or cassette loading block.
YES
YES
YESNO NONO
Does SW3001 and
REC LEVER
correctly set ?
After inserting
CASSETTE, is pin 97
of IC3001 0V ?Correctly SW3001
and REC LEVER set. WHEN INSERTING A CASSETTE,
IT EJECTS IMMEDIATELY 

TROUBLESHOOTING GUIDE
E-7
D-VR4XSU/D-VR4XSC
Check DECK MECHANISM.CAN NOT FF/REW
YESNO At FF/REW, does voltage
at pin 64 of IC3001
change ?Check of IC3001. 

TROUBLESHOOTING GUIDE
E-8
D-VR4XSU/D-VR4XSC
Change CYLINDER unit.
TAPE LOADING IS OK, BUT
UNLOADS IMMEDIATELY
Check POWER BLOCK.
Change IC3001.
Check Q3002 and Q3003.
YESYES
YES
YES
YESNONONO NO
NO
Does CYLINDER
rotate ?
Is there HEAD SW
PULSE at TP3001?Is the voltage
at pin 2 of CP3001
12V ?
At play, is the voltage
at pin 12 of CP3001 2.6V ?
Is PG PULSE signal
inputted to pin 65
of IC3001 ? 

TROUBLESHOOTING GUIDE
E-9
D-VR4XSU/D-VR4XSC
5V
Change
CYLINDER MOTOR.
Change IC3001.
Change CYLINDER MOTOR.YES
YESNONO AT PLAY, THE PICTURE
JITTERS VERTICAL MINUTELY
Is FG wave of CP3001
at pin 11 5V ?
Is pin 12 of CP3001 2.6V ? 

TROUBLESHOOTING GUIDE
E-10
D-VR4XSU/D-VR4XSC
AUTO TRACKING
DOES NOT OPERATE
2.5Vp-p
YESYESNO
NO
In auto tracking, is the
voltage at pin 89 of IC3001
more than DC 0.2V ?Does the CTL pulse
signal (about 2.5Vp-p)
appear at pin 7 of IC3001?.
Check CONTROL HEAD.
Change IC3001. 

TROUBLESHOOTING GUIDE
E-11
D-VR4XSU/D-VR4XSC
YES
YESNO
NO WHEN PLAYBACK, FF OR REW
MODE IS ACTIVE, UNIT STOPS
IMMEDIATELY
Does CAPSTAN DD
MOTOR rotate ?Refer to section CAPSTAN
DD MOTOR NOT
ROTAING.
Is there REEL SENSOR
PULSE signal at pin 3 and 4 of
IC3001?Check Q3005 and Q3006.
Change IC3001. 

TROUBLESHOOTING GUIDE
E-12
D-VR4XSU/D-VR4XSC
YES
YES
YES
YES
YESNO NONO NO AT PLAY, PICTURE JITTERS
HORIZONTALLY
Does a noise on the picture
appear ?
By adjusting the MANUAL
TRACKING UP/DOWN
BUTTONS, will the line
disappear ?Check P/B ENVELOPE.
Is a height of GUIDE POST
maximum ?The height of GUIDE POST
readjust.
Is PG SHIFTER
adjustment 6.5H ?Adjust PG SHIFTER.
Is a wave of PB-Y unusual ?Change IC101
and peripheral circuit.
Change IC101.
NO 

TROUBLESHOOTING GUIDE
E-13
D-VR4XSU/D-VR4XSC
YESYES YES YESNO
NO
NO
NO AT PLAYBACK, THE PICTUER
DOES NOT APPEAR
Does E-E picture
appear ?Refer to
AT E-E, NO PICTURE
Is there video signal
at pin 26 of IC101?Change IC101.
Change IC3001. Is there video signal
at pin 49 of IC3001?
Is there video signal
at pin 47 of IC3001?
Check at pin 5 of J8005 and
peripheral circuit.Change IC3001.
YESNO
Is there video signal
at pin 30 of IC8301?Change IC8301. 

TROUBLESHOOTING GUIDE
E-14
D-VR4XSU/D-VR4XSC
AT E-E, NO PICTURE
OF  VCR MODE
YES YESNO
NO Is there video signal
at pin 26 of IC101?Change IC101.
Change IC3001. Is there video signal
at pin 49 of IC3001?
YESNO
Is there video signal
at pin 32 of IC101?Check IC8301, J603, J8002 ,
TU301and peripheral circuit.
Check J8001.
YESNO
Is there video signal of
at pin 30 IC8301?Change IC8301.
Check at pin 5 of J8005 and
peripheral circuit.