Compensation Adjustment Of X Value; Rev Tape Path Confirmation And Adjustment (T4 Post Height Adjustment) - Panasonic DVCPRO50 Service Manual

3-19. Compensation Adjustment Of
X Value
A10 : X VALUE 50 → 0 ± 27
SPEC
A11 : X VALUE 25 → 0 ± 27
TEST
-----
POINT
ADJ.
Search button
MODE
PLAY
TAPE NTSC:VFM3580KM or VFM3580KL
(PAL:VFM3680KM or VFM3680KL)
TOOL
-----
1. Select A10: X VALUE 50 in SERVO MENU.
2. Playback the alignment tape.
3. Press Search button so that the following
character is displayed on the screen.
PLAY ALIGNMENT TAPE OK?
OK : <SEAR CH>
NO : <Menu>
4. Keep pressing the Search button until the
compensation value on the A10: X VALUE 50 is
renewed. (The value dissapear in a moment
before it is renewed.)
5. Select A11: X VALUE 25 in SERVO MENU.
6. Playback the alignment tape.
7. Press Search button so that the following
character is displayed on the screen.
PLAY ALIGNMENT TAPE OK?
OK : <SEAR CH>
NO : <Menu>
8. Keep pressing the Search button unit the
compensation value on the A11: X VALUE 25 is
renewed. (The value dissapear in a moment
before it is renewed.)
9. Confirm that the compensation value meets the
SPEC.
10. If it is out of SPEC., perform X-value Adjustment
(item 3-18).
3-20. REV Tape Path Confirmation
and Adjustment
(T4 Post Height Adjustment)
!. C1, C2 ≥ Cp1×0.75, Cp2×0.75
SPEC
NOTE:
C1, C2 : CTL output REV (x-1) mode
Cp1, Cp2 : CTL output PLAY (x1) mode.
". Lower limit at T3 post on REV mode.
#. Curl should not appear on tape at T3 and T4
post.
TEST CTL : TP30 : SERVO (F7)
POINT
ADJ. T4 post height
MODE See below
NTSC:VFM3580KM or VFM3580KL
TAPE
(PAL:VFM3680KM or VFM3680KL)
TOOL VFK1151 (Nut Driver)
(VTR mode)
[ PLAY (+1) ]
PLAY on 25M mode
[ REV (-1) ]
SHTL × -1 on 25M mode
1. Place the unit into REV X1 mode and confirm that
the CTL output level becomes more than 75% of
that of play mode. Confirm that the tape path
becomes lower limit at T3 post and the tape does
not have curl at T3 and T4 post.
2. If it is out of specification, adjust T4 post by
following procedure.
3. Turn the Nut of T4 post clockwise or counter
clockwise by the tape limit condition at T3 post.
The rotation angle for each adjustment should be
less than 45 degree in order to prevent the tape
damage.
4. If still it is out of specification, adjust T4 post
height by following the item "3-1. Post Height
Pre-adjustment procedure".
5. Fix the screw by Lock Tight glue after the
adjustment (refer to item 3-27).
[T4 Nut Adjustment Direction]
Direction
Tighten
Loosen
[Post limit]
Post
T3
T4
A: UPPER
D: CURL
MECH-16
Mode
Condition of lower
CTL Level
limit on T3 Post
Increase Tape touch to be strong
Decrease Tape touch to be weak
A B C D
NG NG OK NG
OK OK OK NG
B: FREE C: LOWER
E: BEND F: DROP
Figure 3-20-1
Figure 3-20-2
E F
NG NG
NG NG