A/C Head Azimuth And X-Value Adjustment - Panasonic DVCPRO50 Service Manual

3-18. A/C Head Azimuth and X-value Adjustment

SPEC
25M mode : -250µs ≤ t1, t2 ≤ +250µs
50M mode : -125µs ≤ t1, t2 ≤ +125µs
ADJ.
A/C Head each screw(C,D,F,G) and hole (E)
MODE
See below
TAPE
NTSC : VFM3582KM or VFM3582KL
(PAL : VFM3682KM or VFM3682KL)
(CTL Reference)
Reference (Trigger)
rising edge : refer to below figure.
(VTR mode)
25M/50M : ATF PLAY mode by RP Head.
25M mode : A15 : RPL LIN25
50M mode : A13 : RPL LIN50
1. Set the VTR to ATF PLAY mode by RP HEAD.
2. Set the VTR in 25M mode (A15 : RPL LIN25) and playback an X-value Alignment tape.
3. Confirm that the rising edge of CTL match with the front position of non-recorded portion of CUE. If not adjust
the Screw (F) to match both phase. (refer to "3-13. A/C Head Adjustment Method").
4. Adjust A/C Head Horizontal position so that CTL trigger at the frame start match with the reference of HSW (t2).
The frame start CTL is located at the edge between 6 : 4 and 5 : 5 portion. To adjust A/C Head Horizontal
position, loosen the screw (C) and (D), then adjust the hole (E) by VFK0357. After adjustment, tighten the screw
(C) and (D) with 24.6cN (2.5Kgf) torque.
5. Hit the top plate (portion L as shown in figure) of A/C Head lightly, then confirm the phase is not shifted finally.
6. Confirm that t1 and t2 is within SPEC. If not, return to item 3.
7. Set the VTR in 50M mode (A13 : RPL LIN50) and confirm the timing is within the specification. If it is out of
spec., return to item3.
8. Fix the screw by Lock Tight glue after the adjustment (refer to item 3-27).
Mode
Figure 3-18-1
TEST
R/P ENV L
POINT
R/P HSW L
CUE
CTL
M. EQ
Oscilloscope
TOOL
VFK0357 (Eccentric Driver)
VFK1148 (Hex Driver)
VFK1209A (Torque Driver)
VFK0912 or VFK1375 (Hex Bit)
MECH-15
TP6301 : RF (F8)
TP233 : SERVO (F7)
TP200 : AUDIO (F1)
TP30 : SERVO (F7)
L
Figure 3-18-2