5-5
TROUBLE DESCRIPTION SOLUTION
Thermostat
sensor Controls 1. Replacement of optical bench
failed optical bench requires MSA service
inside
tem
perature
Sensor temperature Checks for 1. Replacement requires MSA service.
range failed temperature
range of 45
to
90 °C
Humidity sensor failed Checks H
2
O 1. Return to MSA for service.
s
ensor output
Infrared source failed Checks the I 1. Return to MSA for service
of source
as
sembly
Photo synchro failed Checks the 1. Return to MSA for service.
chopper for
oper
ation
PA IR sensor failed Checks the 1. Return to MSA for service.
sensor
microphone
for output
Memory protect Checks 1. Return to MSA for service.
ch
ecksum
External reset failed Checks the 1. If not used, check for jumper between RST
external minus and RST plus on J16.
reset button
2. If used, verify switch is wired normally closed.
Display failure Display 1. Check RS485 connector on J15,
commu- terminals 1 and 2.
nications
2.
Check for broken or cracked display.
3.
Remove rear panel cover and check cables
bet
ween the display and the display board.
Audio alarm failure Audio alarm 1. Check output terminals 6 and 7 on J17.
2. Chec
k for faulty horn buzzer.
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