A/C Head Azimuth And X-Value Adjustment (25M) - Panasonic AJ-D440 Service Manual

3-18. A/C Head Azimuth and X-value Adjustment (25M)

SPEC As shown in below figure.
-250µs ≤ t1, t2 ≤ +250µs
ADJ. A/C Head each screw
MODE See below
TAPE NTSC : VFM3582KM or VFM3582KL
PAL : VFM3682KM or VFM3682KL
(Classified list)
TYPE Model
R
A AJ-D440, AJ-D450, AJ-D640,
AJ-D650, AJ-D750, AJ-D850
B AJ-D200, AJ-D210, AJ-D215,
AJ-D400, AJ-D700, AJ-D800,
AJ-D810, AJ-D610
C AJ-D220, AJ-D230, AJ-D230H,
AJ-D250, AJ-LT75, AJ-LT85
1. Set the VTR mode on Service Menu with type A and C models.
2. Playback an X-value Alignment tape.
3. Adjust screw (F) so that the CTL and Lack part of CUE (t2) is match in the phase. (refer to A/C Head
Adjustment Procedure)
4. Confirm the lack track of envelope, and select the HSW correspond with it (The lack track is correspond HSW
high with L ch).
5. Adjust A/C Head Horizontal position so that the reference of HSW and CTL trigger are match in the phase (t1).
To adjust X-value, loosen the screw C and D, adjust the hole E by VFK0357. After adjustment tighten the
screw C and D with 24.5cN-m (2.5Kg) torque. At this time adjust the phase simultaneously with Azimuth so
that the CTL and CUE phase is kept.
6. Hit the top plate ( portion L as shown in figure ) of A/C Head lightly by a pointed end of Eccentric driver , then
confirm the phase is not shifted finally.
TEST RP ENV
POINT PB HSW
CUE
CTL
M.EQ Oscilloscope
TOOL VFK0357 (Eccentric Driver)
VFK1148 (Hex Driver)
VFK1209 (Torque Driver)
VFK1375 (Hex Bit)
(CTL Reference)
TYPE
A Falling edge: refer to below figure (4b).
B, C Rising edge: refer to below figure (4a).
(VTR mode)
TYPE
A, C ATF PLAY mode by RP Head. (refer to [A/C Head
Adjustment mode] on item "2. Table of Test Point".)
D PLAY
2-26
Refer to item "2. Table of Test
Point.
Reference (Trigger)
Mode
L