Sony GY-2120WD Maintenance Manual page 201

(c). S-1 Mode to FWD Mode
(1) Play back the YR2-1 alignment tape (IDR: 0
to 72000). (FWD mode)
(2) Put the unit into the S-1 mode once. Five or
seven seconds later, put the unit into FWD
mode.
At this time, check the following three items
(1 to 3).
1 Check that the RF envelope waveform turns
to the maximum level with the even level
within 1 second. (Spec.5-1)
In case of the waveform become A, B or C,
check that the output level (b) is more than
70% of the level in normal FWD mode (a)
and returns it to the level in normal FWD
mode within 1 second. (Spec.5-2)
If specification 5-2 is not satisfied in wave-
form A or B shown in the figure, check the
tape running at the drum entrance side. (Refer
to Section 5-3.)
If specification 5-2 is not satisfied in
waveform C shown in the figure, check the
tape running at the drum exit side. (Refer to
Section 5-3.)
2 Check that the tape curl at the lower flanges
of TG-0 is less than 1/10 of the tape width.
(Spec.6)
If the specification 6 is not satisfied, adjust
the height of TG-1 and TG-2.
3 Check that the tape curl at the lower flange of
TG-4 is less than 1/10 of the tape width.
(Spec.7)
If the specification 7 is not satisfied, adjust
the height of TG-5.
GY-2120WD/WS
. Alignment tape: YR2-1 (IDR : 0 to 72000)
Spec.5-1: The RF envelope waveform turns to the
maximum level with the even level within
1 second.
waveform A
a
b
waveform C
b
b x 100 > 70%
Spec.5-2:
a
The output level (b) is more than
70% of the level in normal FWD
mode (a) and returns it to the level in
normal FWD mode within 1 second.
TG-0
Spec.6: Lower flanges of TG-0
The tape curl is less than 1/10 of the tape
width.
Spec.7: Lower flange of TG-4
The tape curl is less than 1/10 of the tape
width.
Tracking Check (S-1 → FWD)
5-4. Tracking Adjustment
waveform B
b
a
TG-4
a
5-15