Envelope Waveform Adjustment - Panasonic DVCPRO HD AJ-HDC27VP Service Manual

4-11. Envelope Waveform
Adjustment
V1/Vmax, V2/Vmax, V3/Vmax ≥ 0.8
SPEC
TEST
TP400 (R/P-ENV L13): HEAD BUFF
POINT
TP401 (R/P-ENV R13): HEAD BUFF
TP500 (R/P-HSW L13): HEAD BUFF
TP401 (R/P-HSW R13): HEAD BUFF
ADJ.
S1, T1 Post Height
MODE
PLAY (ATF)
TAPE
VFM3580KM or VFM3580KL
M.EQ
Oscilloscope
TOOL
VFK1149 or VFK1149A (Post Driver)
VFK1185 (BER COUNTER)
VFK1158A (BER COUNTER CABLE)
< To confirm the ENV Lch >
Connect the BER COUNTER CABLE to P4 connector
on RF P.C.Board.
< To confirm the ENV Rch >
Connect the BER COUNTER CABLE to P5 connector
on RF P.C.Board.
Figure 4-11-1
[ Adjustment Procedure ]
1. Adjust both channels envelope by connecting the
test point Lch and Rch alternately.
2. Playback the alignment tape.
3. Adjust S1 and T1 post height so that the envelope
signal is within the specification.
4. To adjust the S1 or T1 posts, at first raise the post
height. Then the envelope at the entrance or exit
side becomes small. Then down the post hight
until envelope becomes flat.
5. As the order of adjustment, adjust T1 post to make
it flat at exit side of envelope first and then adjust
S1 post.
6. After finish this adjustment, unload the tape and
load the tape again, then confirm the shape of
Envelope waveform does not change.
MECH-11
Figure 4-11-2