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 framework,
taking care not to scratch the drum, as shown in Fig. 1-1-
A.
While turning the reel and confirm the following points.
Check if the surface A of reel disk is lower than the
surface B of reel disk height adjustment jig (JG024A)
and is higher than the surface C. If it is not passed,
place the height adjustment washers and adjust to 10(+2,
-0)mm.
Adjust the other reel in the same way.
Fig. 1-2-B
1-3: CONFIRMATION OF PLAYBACK TORQUE AND
BACK TENSION TORQUE DURING PLAYBACK
Load a video tape (T-120) recorded in standard speed mode.
Set the unit to the PLAY mode.
Install the tentelometer (JG185) as shown in Fig. 1-3. Confirm
that the meter indicates 20 ± 2gf in the beginning of playback. 1.
2.
• USING A CASSETTE TYPE TORQUE TAPE (KT-300NR)
1.
2.
3.After confirmation and adjustment of Tension Post
position (Refer to item 1-2), load the cassette type
torque tape (KT-300NR) and set to the PLAY mode.
Confirm that the right meter of the torque tape indicates
50~90gf•cm during playback in SP mode.
Confirm that the left meter of the torque tape indicates
25~40gf•cm during playback in SP mode.
Tentelometer
(JG185)
Video Tape
Guide Roller
P1 Post
Fig. 1-3 1-2: CONFIRMATION AND ADJUSTMENT OF TENSION
POST POSITION
1.
2.
3.Set to the PLAY mode.
Adjust the adjusting section for the Tension Arm position
so that the Tension Arm top is within the standard line of
Main Chassis.
While turning the S Reel clockwise, confirm that the edge
of the Tension Arm is located in the position described
above.
Fig. 1-2-A
Standard line of Main Chassis
Tension Arm
0.5mm (Adjusting range)
Reel Disk Height Adjustment Jig
(JG024A)
Fig. 1-1-A
Reel Disk
Height Adjustment
Washer
2.6x4.7xT0.13
2.6X4.7xT0.25(B)
(C) Master Plane (JG022)
Fig. 1-1-B
(A) 10(+0.2, -0)mmMaster Plane (JG022)
Reel Disk Height
Adjustment Jig
(JG024A)
Adjusting section for the
Tension Arm position
BendTension Band
The Tension Arm top will
move to the outside direction
of the Main Chassis. The Tension Arm top will
move to the inside direction
of the Main Chassis.
D-VR4XSU/D-VR4XSC 
						

							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 Assy
S Reel side:
T Reel side:
2. CONFIRMATION AND ADJUSTMENT OF
TAPE RUNNING MECHANISM
Tape Running Mechanism is adjusted precisely at the
factory. Adjustment is not necessary as usual. When you
replace the parts of the tape running mechanism because of
long term usage or failure, the confirmation and adjustment
are necessary.
2-1: GUIDE ROLLER
Playback the VHS Alignment Tape (Monoscope of ST-N5
MODE2).
Connect CH-1 of the oscilloscope to TP101 (Envelope)
and CH-2 to TP3001 (SW Pulse).
Trigger with SW Pulse and observe the envelope. (Refer
to Fig. 2-1-A)
When observing the envelope, adjust the Taper Nut Driver
slightly until the envelope will be flat.
Even if you press the Tracking Button, adjust so that
flatness is not moved so much.
Adjust so that the A : B ratio is better than 3 : 2 as shown
in Fig. 2-1-B, even if you press the Tracking Button to
move the envelope (The envelope waveform will begin to
decrease when you press the Tracking Button).
Adjust the PG shifter during playback.
(Refer to the ELECTRICAL ADJUSTMENTS) 1.
2.
3.
4.
5.
6.
NOTE
After adjustment, confirm and adjust A/C head.
(Refer to item 2-2)
Fig. 2-1-A
Fig. 2-1-B NOTE
Install the Torque Gauge on the reel disk firmly. Press the
REW button to turn the reel disk.
1-5: CONFIRMATION OF REEL BRAKE TORQUE
(S Reel Brake) (Refer to Fig. 1-4-B)
Once set to the Fast Forward mode then set to the Stop
mode. While, unplug the AC cord when the Pinch Roller
Block is on the position of Fig. 1-4-A.
Move the Idler Assy from the S Reel.
Install the Torque Gauge (JG002F) and Adapter
(JG002B) on the S Reel. Turn the Torque Gauge
(JG002F) clockwise.
Then, confirm that it indicates 60~100gf•cm. 1.
2.
3.
4.
(T Reel Brake) (Refer to Fig. 1-4-B)
Once set to the Fast Forward mode then set to the Stop
mode. While, unplug the AC cord when the Pinch Roller
Block is on the position of Fig. 1-4-A.
Move the Idler Assy from the T Reel.
Install the Torque Gauge (JG002E) and Adapter
(JG002B) on the T reel. Turn the Torque Gauge
(JG002E) counterclockwise.
Then, confirm that it indicates 30~50gf•cm. 1.
2.
3.
4.
Fig. 1-4-A
The position at FF mode.
The position at
STOP mode.Cassette
Opener Pinch Roller Block
Capstan DD Unit
Cassette Holder Assy Stop at this position.
Fig. 1-4-B
Torque Gauge/Adapter
(JG002F/JG002B)
T Reel S ReelTorque Gauge/Adapter
(JG002E/JG002B)
CH-2
SW Pulse (TP3001)CH-1
TrackCH-2
Track CH-1
Envelope
(TP101)
D-VR4XSU/D-VR4XSC 
						

							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 screw 2 to set the audio level to maximum.
Confirm that the bottom of the Audio/ Control Head and
the bottom of the tape is shown in Fig. 2-2-C.
c)When the reflected picture is distorted, turn the screw
1 clockwise until the distortion is disappeared.
When the reflected picture is not distorted, turn the
screw 1 counterclockwise until little distortion is
appeared, then adjust the a).
P4 Cap
Fig. 2-2-A
Fig. 2-2-B
Audio/Control Head
Fig. 2-2-CTAPE RUNNING ADJUSTMENT
(X VALUE ADJUSTMENT)
Confirm and adjust the height of the Reel Disk.
(Refer to item 1-1)
Confirm and adjust the position of the Tension Post.
(Refer to item 1-2)
Adjust the Guide Roller. (Refer to item 2-1)
Confirm and adjust the Audio/Control Head.
(Refer to item 2-2)
Connect CH-1 of the oscilloscope to TP3001 and CH-2 to
TP101.
Playback the VHS Alignment Tape (Monoscope of ST-N5
MODE2).
Press and hold the ATR button on the remote control
more than 2 seconds to set tracking to center.
Set the X Value adjustment driver (JG153) to the 4 of
Fig. 2-2-B. Adjust X value so that the envelope waveform
output becomes maximum. Then, check if the 5 section
of Fig. 2-2-B is on the center position (or rather to the
cylinder side). In case of the envelope maximum at the
difference position from the center, adjust the matching of
picture and sound again. 1.
2.
3.
4.
5.
6.
7.
8.
Audio/Control Head
Reflected picture of
Stamp Mark
Stamp Mark
Tape
0.25±0.05mm
D-VR4XSU/D-VR4XSC 
						

							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 the set and the REC
button on the set for more than 2 seconds. 1.
2.
3.
4.When you exchange IC and Transistor for a heat sink,
apply the silicon grease on the contact section of the
heat sink. Before applying new silicon grease, remove
all the old silicon grease. (Old grease may cause
damages to the IC and Transistor.)
6.5H
CH-1 CH-2
Fig. 1-1-A
CH-1 CH-2
6.5H
Fig. 1-1-B • 
						

							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 CP605 CP601
CD654 CD655
CD652 
						

							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.