TM 3-6665-329-13&P
Control or
Function
Key
Indicator
Flowmeter port
Used during flowmeter and pneumatic test
6
of M43A1 detector.
REMOTE ALARM BOARD
Checks circuit card assembly of M42 alarm unit.
7
A. LAMP
Indicates M42 alarm unit circuit board
assembly is operational.
B. HORN (test light only)
Indicates M42 alarm unit circuit board
assembly is operational.
Activates horn and light circuit of M42
c. ALARM TEST switch
alarm unit circuit card assembly.
When set to ON applies a simulated alarm signal
D. ALARM ACTUATE SWITCH
to the M42 alarm circuit card assembly.
E. Receptacle connector
Receives M42 circuit card assembly.
METER SELECTOR switch
Rotary switch for selecting operations of ammeter.
8
ELECTRONICS MODULE
9
A. REMOTE lamp
Monitor output of M43A1 detector electronic
amplifier trigger circuit for the M42 alarm unit.
Monitors output of the M43A1 detector, electronic
B. HORN lamp
amplifier trigger circuit, which triggers the
circuit for the horn.
Checks air inlet heater circuit of the
C. HEATER switch
M43A1 electronic amplifier.
D. ALARM TEST switch
Used to self-test the alarm test circuit in the
test set with extender board.
When pressed indicates electronic amplifier
E. ALARM RESET switch
circuits are operational.
2-3
