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Measuring
No.
Item
instruments &
Input signals
3
Waveform
• Oscilloscope,
rise check
alignment tape
MC-1(NTSC)
MC-2(PAL)
Color bar portion
4
Damage
• Self-recorded/
check
played tape
60ME
5
Envelope
• Oscilloscope,
check during
alignment tape
FF/REW
MC-1(NTSC)
MC-2(PAL)
Color bar portion
ENV OUT
HID
Measuring point ( * )
Adjustment parts ( - )
Mode
Adjustment level ( + )
* ENV OUT
Eject →Play
Search FWD
[jig connector]
→Play
* HID [jig connector]
+The envelope
Search REV
→ Play
waveform should be
restored within 1
sec.
* ENV OUT
Play
↓
[jig connector]
* HID [jig connector]
Search REV
↓
+The tape should not
Search FWD
be damaged by
↓
wrinkle.
Play
* ENV OUT
FF
REW
[jig connector]
* HID [jig connector]
+A > 55µsec.
+B
T/3
ı
t
Å
T
Fig. 2-12-8
Adjustment procedure
(1) Switch the mode from Eject → Play and en-
sure that the envelope waveform is restored
in less than 1 sec.
(2) Switch the mode from Search FWD → Play
and from Search REV → Play, and ensure that
the envelope is restored in less than 1 sec. in
both cases.
(3) If the waveform does not restore in the speci-
fied period, fine-adjust the supply/take-up
guide rollers as far as the envelope waveform
specification is met, then restart checking from
the above procedure 1 again.
(1) Transport the self-recorded/played tape from
the beginning by changing modes in order of
Play → Search REV → Search FWD → Play,
and ensure that wrinkles due to strong restric-
tion 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.
(1) Insert the alignment tape and enter Stop mode.
(2) Enter FF mode.
(3) Ensure that the envelope output is present at
55 (s 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.
This checking should be done after complet-
ing the switching point adjustment.
(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 as required. Confirm the playback
switching point.
MAX
HIGH
LOW
2-36
2-37
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