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TECHNICAL THEORY OF OPERATION - Continued
Section II. OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)

Simulator, Detector Uni Chemical Agent Automatic Alarm, M81 \(Nsn 6665-01-088-4789\)
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CHAPTER 2
O P E R A T I N G INSTRUCTIONS
Section
I.
D E S C R I P T I O N AND USE OF OPERATOR'S CONTROLS AND
INDICATORS
2-1.
TRANSMITTER
CAUTION
Do  not  operate  transmitter
OPR
switch
if
antenna  is  not  installed.
Transmitter  controls  and  indicators
consist
of
the
OPR
switch,
the
TEST
GOOD
in-
dicator,  and  the  CHAN  SEL  switch.
a.  The  OPR  switch  (1)  is  a  2-position  momentary  switch.  When  the  switch  is  in
the  off  position,  no  current  is  routed  to  transmitter  circuitry.
When  the  switch
is  pushed  to  the  OPR  position,  the  TEST  GOOD  indicator  will  light  if  the  transmit-
ter  batteries  are  good.
The  transmitter  will  broadcast  a  coded  signal  if  the  CHAN
SEL  switch  is  in  Position  1,  2,  3,  or  4.
b.
The  TEST  GOOD  indicator  (2)
is  a  red  indicator  light.  This  indicator  comes  on
whenever  the  OPR  switch  is  pushed
to  the  OPR  position  if  the  transmitter  batteries
are  good.
Four  posi-
c.  The  CHAN  SEL  switch  (3)  is  a  5-position  rotary  selector  switch.
tions  correspond  to  UNIT  numbers  recorded  on  the  GROUP/UNIT  identification  plates
mounted  on  receivers.  The  fifth  position  is  the  TEST  position.  When  the  OPR
switch  is  pushed  to  the  OPR  position~  the  receiver(s)  with  a  UNIT  number  matching
If  the  CHAN  SEL  switch  is
the  CHAN  SEL  switch  numbered  setting  will  be  activated.
in  the  TEST  position,  a  battery  test  circuit  will  check  battery  voltage,  and  no
receivers  will  be  activated.
2-1






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