Panasonic AG-DV2500P Service Manual page 75

Measuring
No. Item instruments &
Input signals
3 Waveform • Oscilloscope,
rise check alignment tape
VFK1842
Color bar portion
4 Damage • Self-recorded/
check played tape
60 ME
270ME
5 Envelope • Oscilloscope,
check during alignment tape
FF/REW VFK1842
Color bar portion
ENV OUT
HID
2-30
Measuring point
Mode Adjustment parts (
Adjustment level (
Eject Play TP9 ENV OUT
Search FWD [REWRITE board]
Play TP5 HID
Search REV [REWRITE board]
The envelope
Play
waveform should be
stabilized within 1
sec.
Play TP9 ENV OUT
[REWRITE board]
Search REV TP5 HID
[REWRITE board]
The tape should not
Search FWD
be damaged by
Play wrinkle.
FF TP9 ENV OUT
REW [REWRITE board]
TP5 HID
[REWRITE board]
A 55µsec.
B T/3
t
A
T
Fig. 2.9.6
( )
) Adjustment procedure
)
(1) Switch the mode from Eject
nfirm that the envelope is stabilized in less than
1 sec.
(2) Switch the mode from Search FWD
and from Search REV
the envelope is stabilized in less than 1 sec. in
both cases.
(3) If the envelope does not stabilized in the speci-
fied period, fine-adjust the supply/take-up
guide rollers as far as the envelope waveform
specification is satisfied, then restart checking
from the above procedure (1) again.
(1) Transport the self-recorded/played Mini cas-
sette tape from the beginning by changing
modes in order of Play
Search FWD
due to strong restriction by the guide rollers
and guide pole are not produced on tape.
(2) Perform the same check at the section near
the end of tape.
(3) Confirm that no tape damage occurs when
a tape is being loaded, unloaded or ejected.
(4) Perform the same procedures (1) — (3) with a
standard cassette.
This checking should be done after completing
3-2-1. PB switching point adjustment.
(1) Insert the alignment tape and enter Stop mode.
(2) Enter FF mode.
(3) Confirm that the envelope output is present at
55 µs before the HID switching timing.
B
(4) Check the take-up side of the envelope to see
that the MAX output duration is more than 1/3
the HID duration.
(5) Enter REW mode and check the same items
as (3) and (4) above.
(6) If the envelope is out of specification, check
the tension band and main brake assembly and
MAX
replace if needed. Confirm the playback
switching point.
HIGH
LOW
Play and co-
Play
Play, and confirm that
Search REV
Play, and confirm that wrinkles