Panasonic AJ-D230H - A;C Head Azimuth and Horizontal Posiition Adjustment (AJ-D780 & AJ-DE77); A;C Head Azimuth and Horizontal Position Adjustment (AJ-D940)

2-28
3-18. A/C Head Azimuth and Horizontal Position Adjustment
(AJ-D780 & AJ-DE77)
SPEC As shown in below figure
TEST
FLAME PULSE
Refer to item “2. Table
POINT
L13 ENV
Of Test Point”
-250µs ≤ t1, t2 ≤ +250µs L13 HSW
CUE OUT
CTL OUT
ADJ.
A/C Head each screw
M. EQ
Oscilloscope
MODE
PLAY (Frame synchronized mode)
TOOL
VFK0357 (Eccentric Driver)
VFK1148 (Hex Driver)
TAPE
NTSC : VFM3582KM or VFM3582KL
PAL : VFM3682KM or VFM3682KL
VFK1209 (Torque Driver)
CTL Reference Falling edge
VFK1375 (Hex Bit)
1. Confirm that the phase of CUE and CTL are within specification against Frame pulse trigger. If it out of spec.,
perform adjustment follow the below procedure.
2. 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).
3. Confirm the lack track of envelope, and select the HSW correspond with it (The lack track is correspond HSW
high with L ch).
4. Adjust A/C Head Horizontal position so that the memorized HSW and CTL trigger at the frame start is match
in the phase (t1). 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, 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.
5. 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.
NOTE : If the waveform could not be stabilized by trigger (HSW or CTL) on the scope, please use the TP105 (CF
PULSE) on the SERVO (in case of AJ-D780) or V OUT (in case of AJ-DE77) P.C.Board.
6. After finish this X-value adjustment, EVR adjustment is required follow the below procedure.
<In case of AJ-D780>
1. Select item “A06 : X VALUE” on Service menu.
2. Playback the X-value alignment tape.
3. Press cursor button “→” or “←” and keep it until
numerical value is renewed.
4. Confirm that the value is 0 ± 55.
5. If out of specification, perform the X-value
adjustment again.
<In case of AJ-DE77>
1. Select item “A09 : X VALUE” on Service menu.
2. Playback the X-value alignment tape.
3. Press “SERACH” button and keep it until
numerical value is renewed.
4. Confirm that the value is 0 ± 55.
5. If out of specification, perform the X-value
adjustment again.
L