Toshiba Dvr4xsu Owners Manual

D2-1
MECHANICAL ADJUSTMENTS
1. CONFIRMATION AND ADJUSTMENT
Read the following NOTES before starting work.
• Place an object which weighs between 450g~500g on the
Cassette Tape to keep it steady when you want to make
the tape run without the Cassette Holder. (Do not place an
object which weighs over 500g.)
CONFIRMATION AND ADJUSTMENT OF REEL DISK
HEIGHT 1-1:
1.
2.
3.
4.Turn on the power and set to the STOP mode.
Set the master plane (JG022) and reel disk height
adjustment jig (JG024A) on the mechanism...

D2-2
Entrance Exit
Max
A : B ≥ 3 : 2
AMax
B
S Reel/Tension Band/Tension
Connect/Tension Arm Assy
T Reel/T Brake Band//T Brake
Spring/T Brake Arm
MECHANICAL ADJUSTMENTS
1-4: CONFIRMATION OF VSR TORQUE
Install the Torque Gauge (JG002F) and Adapter (JG002B)
on the S Reel. Set to the Picture Search (Rewind) mode.
(Refer to Fig.1-4-B)
Then, confirm that it indicates 120~180gf•cm. 1.
2.NOTE
If the torque is out of the range, replace the following parts.
Check item
1-4
1-5Replacement Part
Idler Assy/Clutch...

D2-3
Audio/Control Head
1
3
2
4 5
[NG][OK]
MECHANICAL ADJUSTMENTS
2-3: 2-2:
When the Tape Running Mechanism does not work well,
adjust the following items.CONFIRMATION AND ADJUSTMENT OF AUDIO/
CONTROL HEAD
1.
2.
3.
4.
When the height is not correct, turn the screw 3 to
adjust the height. Then, adjust the 1~3 again. Playback the VHS Alignment Tape (Monoscope of ST-N5
MODE2).
Confirm that the reflected picture of stamp mark is
appeared on the tape prior to P4 Cap as shown in Fig. 2-
2-A.
a)
b)
Turn the...

D2-4
MECHANICAL ADJUSTMENTS
3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE
5
6
7
8 9 10 1 234
1. Tension Connect
2. Tension Arm
3. Guide Roller
4. Audio/Control Head
5. X value adjustment driver hole6.
7.
8.
9.
10.P4 Post
T Brake Spring
T Reel
S Reel
Adjusting section for the Tension Arm position
D-VR4XSU/D-VR4XSC 

ELECTRICAL ADJUSTMENTS
D3-1D-VR4XSU/D-VR4XSC Read and perform this adjustment when repairing the
circuits or replacing electrical parts or PCB assemblies.
1. BASIC ADJUSTMENT
CAUTION
1-1: PG SHIFTER
CONDITIONS
MODE-PLAYBACK
Input Signal-Alignment Tape
INSTRUCTIONS
Connect CH-1 on the oscilloscope to TP3001 and CH-2
to Pin 5 of the J8005.
Playback the alignment tape.
Press and hold the Tracking-Auto button on the remote
control more than 2 seconds to set tracking to center.
Press both VCR/DVD button on...

ELECTRICAL ADJUSTMENTS
2. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION)
D3-2
TU301 CP1702
DVD/HD MPEG PCB
POWER PCB
OPERATION1 PCB
DECK CD
CP103
FE HEAD
CP102
AC HEAD
CD102
CD7304
VCR PCB
FAN MOTOR
CD502
CD7301
CD7302
CD7303
OPERATION2 PCB
DISPLAY PCB
CD103CD4003 CD504
S501 S502CD501
AC IN
CP604
J603 J602 J601
CP603
CP4005
CP7303
CP7301
CP7302CP7304
J8001J8004J8006
J8005
J8002 J8003OS8001
CP652
J655
CP8303 CP8301
CP1701
TP3001TP101
CP8302
CP654CP655
CP506
CP502
CP504
V601
OS601
CP602...

TROUBLESHOOTING GUIDE
E-1
D-VR4XSU/D-VR4XSC
POWER DOES NOT TURN ON
NO
(VCR SECTION)
YESNO
YESNOYES
Check of T501 and peripheral
circuit.Check of V601 and peripheral
circuit.
Check IC652. Check of T501
and peripheral circuit.
Is the voltage at
pin 5 of IC 652
0V ? Does display light ?
Is the voltage
linked to L506 ? 

TROUBLESHOOTING GUIDE
E-2
D-VR4XSU/D-VR4XSC
THE POWER SUPPLY CUT
Inserting a cassette
and push play button.
YES
YES
NO NO Does the power cut
after 3 seconds ?Check CAPSTAN DD UNIT
and CYLINDER UNIT.
Does the power cut
after about 6 seconds ?Check Q3001, Q3002
and CAPSTAN BELT.
Check the POWER BLOCK. 

TROUBLESHOOTING GUIDE
E-3
D-VR4XSU/D-VR4XSC
Check IC3001.
Check the DECK BLOCK.YES
YESNO
NO AT PLAYBACK AND RECORDING,
CYLINDER MOTOR UNLOAD
Is the voltage at pin 8 of
CP3001 about DC12.6V ?Check IC502.
In playback, is at pin 12 of
CP3001 about DC2.6V ? 

TROUBLESHOOTING GUIDE
E-4
D-VR4XSU/D-VR4XSC
YES
YES
YESNO NO NO AUDIO SHAKES
Is AUDIO HEAD
scratched ?Change AUDIO HEAD.
At playback, is input about
4.5Vp-p of a rectangular
wave at pin 67 of IC3001 ?Change CAPSTAN DD UNIT.
Check IC3001. At playback, is pin 5 of
CP3001 3.5V ?
Check AUDIO BLOCK.