Confirmation Of Reel Brake Torque; Confirmation And Adjustment Of Tape Running Mechanism; Guide Roller - JVC HR-XV1EK Service Manual

1-4: CONFIRMATION OF REEL BRAKE TORQUE

(S Reel Brake) (Refer to Fig. 1-2-B)
1. 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. 1-2-A.
2. Move the Idler Ass'y from the S Reel.
3. Install the Torque Gauge on the S Reel. Turn the Torque
Gauge clockwise.
4. Then, confirm that it indicates 60~100gf•cm.
(T Reel Brake) (Refer to Fig. 1-2-B)
1. 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. 1-2-A.
2. Move the Idler Ass'y from the T Reel.
3. Install the Torque Gauge on the T reel. Turn the Torque
Gauge counterclockwise.
4. Then, confirm that it indicates 30~50gf•cm.
The position at FF mode.
Stop at this position.
The position at
STOP mode.
Capstan DD Unit
Cassette Holder Ass'y
Torque Gauge
S Reel
NOTE
If the torque is out of the range, replace the following parts.
Check item
1-3 Idler Ass'y/Clutch Ass'y
1-4 S Reel side:
T Reel side:
1-18
MECHANICAL ADJUSTMENTS
Pinch Roller Block
Cassette Opener
Fig. 1-2-A
Torque Gauge
T Reel
Fig. 1-2-B
Replacement Part
S Reel/Tension Band/Tension
Connect/Tension Arm Ass'y
T Reel/T Brake Band//T Brake
Spring/T Brake Arm
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

1. Playback the VHS Alignment Tape (MHPE).
2. Connect CH-1 of the oscilloscope to TP102 (Envelope)
and CH-2 to TP101 (SW Pulse).
3. Press and hold the Tracking-Auto button on the remote
control more than 2 seconds to set tracking to center.
4. Trigger with SW Pulse and observe the envelope. (Refer
to Fig. 2-1-A)
5. When observing the envelope, adjust the Roller Driver
(PTU94002-2) slightly until the envelope will be flat.
Even if you press the Tracking Button, adjust so that
flatness is not moved so much. (Refer to Fig. 2-1-B)
6. Adjust so that the A : B ratio is better than 3 : 2 as shown
in Fig. 2-1-C, even if you press the Tracking Button to
move the envelope (The envelope waveform will begin to
decrease when you press the Tracking Button).
7. Adjust the PG shifter during playback.
(Refer to the ELECTRICAL ADJUSTMENTS)
NOTE
After adjustment, confirm and adjust A/C head.
(Refer to item 2-2)
CH-1
Envelope
(TP102)
CH-2
SW Pulse (TP101)
Improper
(a) Guide roller
(b) P4 Cap
Entrance
Max A
CH-1 CH-2
Track Track
Fig. 2-1-A
Proper
Fig. 2-1-B
Exit
B Max
A : B ≥ 3 : 2
Fig. 2-1-C