Spitfire – Maintenance Manual
244
AP-74096, Rev. 1.0, 09/06/05
7.16.3. Power board.
RED/GREEN(revC) ON OFF
D2
From rev C on, it will be
a green led
OK NO +24V present
→ PS ok?
→ Power cable ok?
RED ON OFF D1
110/220V indicator Should be on in a 110V
grid.
Should be off in a 220V
grid.
ON OFF RED
Heater is on Heater is off
D23, 21,19,13,6,4
During cold start-up, the selftest will run.
All leds should go on, one at a time, for a short period.
After a warm start-up, the selftest will not run.
During normal operation: leds can go on in a random manner.
7.16.4.
Heater Elements
Resistance (Ω) 65” 90”
A
2 x 32,3 2 x 24,2
B1/B2
2 x 65,5 2 x 44
C
2 x 32,3 2 x 22,5
D1/ D2
2 x 22,5 2 x 22,5
Thermal Sensor
10k 10k
When checking the thermal sensors, also measure them with the chassis as a reference. If the resistance is
not infinite, the sensor has a short circuit, mostly due to a damaged cable.
If the resistance is infinite, the thermal fuse might be blown. Or in minor cases, check for bad connections at
heater elements and connector.
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