Panasonic PV-M1348, Service Manual

Page: 42 / 130

2-19
P1 Post
Tension Post Hex. Wrench
hole center
Tension
Adjust Piece
Insert
(2mm) Hex. Wrench
Full Erase
Head
1mm
A
Upper
Cylinder
Head Cleaning
Stick (VFK27)
Video Head
Counterclockwise
ADJUSTMENT PROCEDURES
TENSION POST ADJUSTMENT
Purpose:
To maintain a constant tape tension so that the tape runs
with stability by performing preliminary adjustment.
Symptom of Misadjustment:
1) If the adjusted value is below the specification, the tape
tension is not sufficient, thus causing a tape slack.
2) If the adjusted value is above the specification, the tape
tension is too high, thus causing tape damage.
Equipment Required:
2 mm Hex. Wrench ......................... (Purchase Locally)
1. Remove the Cassette Up Ass'y.
2. Plug the AC plug into an AC outlet.
3. Place the unit in the Service Mode. Refer to "Service Mode"
in the "Service Notes" section of this manual.
The power comes on and the unit goes into the PLAY
Mode.
4. Using a (2 mm) Hex. Wrench, adjust the nut on the Tension
Adjust Piece (counterclockwise only) so that there is a
space of 1 mm between the left edge of the P1 Post and the
right edge of the Tension Post. Make sure that the center
of the Hex. Wrench hole is within Area "A".
5. After adjustment, remove the Hex. Wrench.
6. Press the STOP/EJECT button to place the unit in the
EJECT Mode.
7. Release the unit from the Service Mode. Refer to "Service
Mode" in the "Service Notes" section of this manual.
Fig. M2
MECHANICAL ADJUSTMENT
CLEANING PROCEDURE FOR THE UP-
PER CYLINDER UNIT
1. While slowly turning the Upper Cylinder Unit
counterclockwise by hand, gently rub the Video Heads with
a Head Cleaning Stick (VFK27) moistened with Ethanol.
When using a Cleaning Cassette, make sure to use "DRY"
type only and be aware that excessive use can shorten
head life.
Fig. M1
Note:
1) Do not rub vertically or apply excess pressure to the
Video Heads.
Do not turn the Upper Cylinder Unit clockwise while
cleaning.
2) After cleaning, use a Dry Head Cleaning Stick (VFK27)
to remove any Ethanol remaining on the cylinder tape
path. Otherwise, tape damage will occur.