ARMY TM 9-6115-671-14
AIR FORCE TO 35C2-3-446-32
MARINE CORPS TM 09249A/09246A-14
4-116
b. Testing
NOTE
There is no indication that the I/O Module has failed in its installed location, other
than the “HEARTBEAT” indicator (36) Figure 2-3, is off when DC Power is
applied to the Module, or the indicator remains continuously on at any time.
(1) The heartbeat Indicator (36) Figure 2-3, is normally “ON” blinking when DC power is applied to the
module. It is also normally “ON” blinking when the Generator set is operating (engine is running )
and the I/O Module is functioning properly. If the indicator is either steady state ON or steady state
OFF, with the CIM on and the engine running, this indicates there is a problem in the I/O module, and
it should be replaced.
c. Replacement
(1)
Shut down generator set, paragraph 2.11.2.
(2)
Open BATTERY ACCESS door (Figure 1-2), and disconnect negative battery cable .
(3)
Remove DCS control box top panel, paragraph 4.7.2.
(4)
Remove CIM. See paragraph 4.8.16.
(5)
Attach ESD wrist strap and connect to ground.
CAUTION
I/O interface module is connected to the CIM and DCS wiring harnesses
module by multi-pin electrical connectors. Use care when disconnecting and
connecting the wiring harness to the I/O interface module. Failure to comply
can cause damage to equipment.
(6)
Tag and disconnect electrical connectors P20, P21, P17 and P25. Refer to Schematic FO-1.
(7)
Disconnect ribbon cable assemblies P23 (17) and P8 (33) from I/O interface module (25).
(8)
Remove screws (23), lockwashers (24), and I/O interface module (25) from DCS control box rear
panel.
(9)
Set I/O Interface Module Configuration Switch for the proper Generator Set Application. See
paragraph 4.16.
(10) Install I/O interface module (25), lockwashers (24), and screws (23) on DCS control box rear panel.
(11) Install ribbon cable assemblies P23 (17) and P8 (33), to I/O interface module (25).
(12) Connect electrical connectors P20, P21, P17, and P25 to I/O interface module (25) and remove tags.
Refer to Schematic FO-1.
(13) Disconnect ESD wrist strap, and remove wrist strap.
(14) Install CIM. See paragraph 4.8.16.
