TM 32-5835-005-14 & P
reel fails to turn, the negative pulse
6-8. Power Supply.
energizing the base of Q1 will soon
decay and turn off Q1 and Q3. This
As shown in Figure 6-14., the power
will provide a positive pulse to act-
supply A1A7 provides regulated +15 VDC
ivate STOP logic and prevent system
and a Zener referenced +21 VDC. The
supply receives its AC input voltage
damage.
from the power transformer A1A12T1
6-6. Tone Generator.
(115 or 230 VAC) or +22 to +40 VDC
battery voltage applied through CR6.
Deleted.
The +15 regulation is achieved with U1
which is internally programmed to supply
+15 volts. The Zener referenced supply
of +21 volts is effected through VR1
and Q1 on the supply board and transistor
A1A12Q1 which is chassis mounted.
The available current range of voltage
regulation available from VR1 is mul-
tiplied by A1A7Q1 and A1A12Q1.
As they are close in value,
this configuration is often referred to
as a voltage regulator. Selection
of input voltages is achieved on the
(See Figure
rear panel connector A1J8.
6-7. Elapsed Time Indicator.
6-15.)
Refer to bias oscillator board (See
Figure 6-9.) M1 is a capillary tube
filled with mercury separated by a gap
of electrolyte. When a current passes
through the indicator, mercury par-
ticles are deposited on the anode ter-
minal. As mercury deposition continues,
the electrolytic gap appears to travel
from anode to cathode at a rate propor-
tional to the current flew. Current is
supplied to M1 by the tape moving signal
from logic board, A1A6. This signal is
generated whenever spool brakes are re-
leased; FAST FWD, REWIND, PLAY and
RECORD.
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