Panasonic AJSDX900P - 24P DVCPRO 50, Service Manual, Page: 54 / 421

MECH-13
1-18. A/C Head Azimuth and X-value Adjustment (SD 50M)
SPEC
25M mode : -250 µ s
≤
t1, t2
≤
+250 µ s
50M mode : -125 µ s
≤
t1, t2
≤
+125 µ s
TEST
POINT
Refer to item “6. Table of Test Point for each
adjustment item.”
Click this button , then go to item
“6. Table of Test Point for each
adjustment item.”
ADJ. A/C Head each screw(C,D,F,G) and hole (E) M. EQ Oscilloscope
ADJUSTMENT
MODE
Refer to item “6. Table of Test Point for each
adjustment item.”
TAPE
NTSC : VFM3582KM, PAL : VFM3682KM
CTL reference
Riging edge
TOOL
VFK0357 (Eccentric Driver)
VFK1148A (Hex Driver)
VFK1209A (Torque Driver)
VFK0912 or VFK1375 (Hex Bit)
1.
Set the Adjustment mode.
2. Set the VTR in 25M mode and playback an X-value Alignment tape.
25M/50M mode and Adjustment mode setting procedure is mentioned on item “6. Table of Test Point for each
adjustment item.”
Click this button , then go to item “6. Table of Test Point for each adjustment item.”
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.
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 and confirm the timing is within the specification. If it is out of spec., return to item 3.
8. Fix the screw by Lock Tight glue after the adjustment.
L
(1) R/P ENV L
Set Center of Variation of CTL
(2) R/P HSW L
(3) CUE
(4) CTL
CTL Duty
t1 (CUE Phase Shift)
t2 (CTL Phase Shift)
Refference of HSW