Measuring
Measuring point ( )
No. Item instruments & Mode
Adjustment parts ( )
Adjustment procedure
Input signals
Adjustment level ( )
2-30
3 Waveform
rise check
• Oscilloscope,
alignment tape
VFK1842
Color bar portion
Eject Play
Search FWD
Play
Search REV
Play
(1) Switch the mode from Eject Play and co-
nfirm that the envelope is stabilized in less than
1 sec.
(2) Switch the mode from Search FWD Play
and from Search REV Play, and confirm that
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.
TP9 ENV OUT
[REWRITE board]
TP5 HID
[
REWRITE board
]
The envelope
waveform should be
stabilized within 1
sec.
4 Damage
check
• Self-recorded/
played tape
60 ME
270ME
Play
Search REV
Search FWD
Play
(1) Transport the self-recorded/played Mini cas-
sette tape from the beginning by changing
modes in order of Play Search REV
Search FWD Play, and confirm that wrinkles
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.
TP9 ENV OUT
[REWRITE board]
TP5 HID
The tape should not
be damaged by
wrinkle.
5 Envelope
check during
FF/REW
• Oscilloscope,
alignment tape
VFK1842
Color bar portion
FF
REW
TP9 ENV OUT
[REWRITE board]
TP5 HID
[REWRITE board]
A 55µsec.
B
T/3
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.
(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
replace if needed. Confirm the playback
switching point.
Fig. 2.9.6
MAX
t
B
T
HIGH
LOW
ENV OUT
HID
[REWRITE board]
A
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