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MODELS P531, P532 AND P532UI OPERATING MANUAL
If the viewing head is not listed.
If the viewing head is not listed as a choice in either
the Viewing head or the channel branch:
Check that the viewing head is compatible with the
P531/P532.
Check that the viewing head cable is in good condi-
tion.
Verify that 24 volts DC is present at the cable head.
Note: power to VH #3 is pulsed when no viewing
head has answered. Check that the viewing head is
operational.
A meter or Oscilloscope on the SC with reference to
ground will show:
At least 20% duty cycle at 15 volts Peak for
S55x viewing heads.
At least 10% duty cycle at 24 volts Peak for
S70x/S80x viewing heads.
With S70x and S80x viewing heads the Green LED
will flash once per second.
S55xx viewing heads will show a number on the
display.
Viewing heads without numeric displays will flash if
flame signal is present.
Substitute a known good viewing head using a
known good cable.
Channels display LKOUT
Channels display LKOUT that will not stay cleared
(after pressing any key).
Viewing head problem or cable problem. See above
steps. (Reset OPTION defaults).
The Display flashes “HOT”
Indicates that the viewing head listed is nearing or
exceeded maximum operational temperature. The
system will try to continue operating as long as it can
and the flashing display is only a warning.
CODE display.
This is an indication of a processor failure.
It can be caused by a power failure during a memory
store operation or other more serious fault.
If the unit is not restored by cycling the power and set-
ting factory defaults:
Record the numbers on the display.
Remove the unit from service and return it to
the factory for failure analysis and repair.
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