5-4-(I). P2Andp3 Postsadjustment - Panasonic REV-1 Service Manual

5-4-(l). P2 AND P3 POSTS ADJUSTMENT
Equipment required:
Alignment Tape (PALLSECAM: VFJ8125H3F)
(NTSC: VFM8080HQFP)
Post Adjustment Screwdriver (VFK0329)
(1) Connect. the oscilloscope to the output of the
Head Amp as shown in Fig. M6.
NOTE: To get a stable waveform of the Head Amp
output (observation point TW3001 and
TW2001 located on Main C.B.A.) on the os-
cilloscope, use the head switching pulse as
a triggering signal as shown in Fig. M6.
(2) Playback the Alignment Tape.
(3) If the RF envelope appears Iike example "A" or
"B" in Fig. M7, then adjustment of the tape guide
post (P2: Entrance) is necessary.
(4) Adjust the tape guide post (P2) with the post
adjustment screwdriver so.that the RF envelope
waveform at the entrance portion becomes flat
as shown in Fig. M7 "C".
1
--------
I
Fig. M7
(5) If the RF envelope appears like "D" or "E" in
Fig. M8, then adjustment of the tape guide post
(P3: Exit) is necessary.
(6) Adjust the tape guide post (P3) in the same man-
ner as the P2 post so that the exit portion be-
comes flat as shown in Fig. M8 "F".
xit
Portion
F
D
0.
I-
E
Fig. M8
Fig. M6 Connect of Oscilloscope
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