Teac MT-20D-IO - Page 146

"Example"
\.Jhen the voltage
sensor
reading
4.85 V.
test tape
voltage
entered on the label of the hole
is 4.85 V, adjust R41 until the
of the digital voltmeter becomes
(0) Disconnect the digital voltmeter, and connect the oscilloscope to
TP13 on the PCBA Drive Control.
(p) Key in "E2" and "E3". The indicators HOLE SKIP and REPEAT on SOA
light up.
(q) Key in 2 The tape is wound forward and reversely alternately
with the BOT hole as a center.
(r) When the BOT hole passes through the front of the hole sensor,
observe the hole detection waveform at TP13, and check if the time
of the portion where the low level at the hole detection time is
0.5 V or less is 200 microseconds or more (Fig. 430).
---- 0.5 V
1-
o V
LJ
t
200 microseconds or more
Fig. 430 Hole detection waveform at TP13
(s) Key in "F" to stop the operation.
(t) Key in "8".
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