TM 10-5410-228-24
2.8
UNIT LEVEL TROUBLESHOOTING PROCEDURES Continued.
22. NO HOT AIR WHEN OPERATING WITH `EXT' (10 kW TQG) POWER Continued.
4
Gain access to temperature
control unit.
Turn system power off.
Remove connector A4P1 from
Reconnect A4P1 to
temperature control unit (see
Is
Yes
temperature control unit.
24 Vdc
Turn system power on.
Turn system on.
present?
Test for continuity between
Test for 24 Vdc across pins 4
pin 3 to ground.
and 5.
No
Replace circuit
breaker CB1.
Turn system off.
No
Gain access to circuit breaker
CB1.
Does
Set CB1 to on.
continuity
Test for continuity between
exist?
terminals.
Yes
Yes
Turn system off.
Does
Gain access to pan assembly
continuity
and remove relay A4K10.
exist?
Apply 24 Vdc across pins X1
and X2.
No
Test for continuity between
Replace temperature
pins A1 & A2 and B1 & B2.
control unit.
Does
Yes
Replace relay
No
continuity
A4K10.
exist?
5
2-80