Ntsc Pg Shifter Adjustment; Tracking Fix Adjustment; Slow Free Run Adjustment; Forward Slow Tracking Adjustment (For Ag-7350) - Panasonic AG-7350 Series Service Manual

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5-3-4. NTSC PG SHIFTER ADJUSTMENT
TP ADJ. MODE INPUT
TP2201
VR2203
NTSC
X
VIDEO OUT PLAY
TAPE M. EQ. SPEC.
VFM8080HQFP OSCILLO-
6.5H±0.5H
PORTION:
'2~
SCOPE
Note : Tape interchangeability adjustment should
be always completed before this adjustment.
1. Set the TV system switch to the NTSC position.
2. Play back the NTSC alignment tape at the
portion 2.
3. Connect the asci lloscope to the video output
for CH1 and TP2201 for CH2.
4. Adjust VR2203 for 6.5H +/- 0.5H as shown in
Figure E4.
5. Change the triggering slope of the
asci lloscope from - to "+" sided, and
confirm that the difference between the rising
and fa IIi ng edges become less than 20 usee.
TP2201---.,...,___ _ _ _ 6.5±0.5H---....,..
(HSW)
VIDEO
OUT
Figure E4
5-3-5. TRACKING FIX ADJUSTMENT
TP ADJ. MODE INPUT
TP2201 (H. SW)
VR2207
PAL
X
TP2202 (CTL)
PLAY
TAPE M. EQ. SPEC.
VFM8180HADH OSCILLO-
T = 0.4 ± 0.4 msec
PORTION: 2 SCOPE
Note: Tape interchangeability adjustment should be
always completed before this adjustment.
1. Play back the alignment tape at the portion 2.
2. Connect the asci lloscope to TP2201 for CH-1
and TP2202 for CH-2.
3. Adjust VR2207 for 0.4 +/-0.4msec as shown in
Figure E5.
5-6
TP2201
(HEAD SW)
TP2202
(PB CTL)
A B
----~t-------.1
A:B=6:4
Figure E5
5-3-6. SLOW FREE RUN ADJUSTMENT
TP ADJ. MODE INPUT
TP2203 VR2208
PAL
X
SLOW
TAPE M. EQ. SPEC.
VFM8180HADH FREQ
f=458Hz±10Hz
PORTION:
~~z~
COUNTER
1. Play back the alignment tape at the portion 2
and place the unit in slow mode.
2. Connect the jumper wire between TP2204 and
GND.
3. Connect the frequency counter to TP2203.
4. Adjust VR2208 so that the reading of frequency
counter is 458Hz +/-1OHz.
5. After this adjustment, remove the jumper wire
from TP2204 and GND.
5-3-7. FORWARD SLOW TRACKING ADJUSTMENT
(FOR AG-7350)
TP ADJ. MODE INPUT
TP2201 (H. SW)
PAL
TP3004
VR2205
SLOW
MONOSCOPE
PLAY
TAPE M. EQ. SPEC.
SELF
OSCILLO-
RECORDED
SCOPE
ENVELOPE LEVEL: A= 8
TAPE
1. Record a monoscope signal for a few minute and
play back the just recorded portion in the
slow mode.
2. Connect the oscilloscope to TP3004 for CH-1
(which triggered with H.SW signal).
3. Adjust VR2205 so that the RF envelope becomes
the same level between A and B portions as
shown in Figure E6.
ENVELOPE LEVEL: A Channel= B Channel
OK NG
Figure E6