STATUS INDICATORS AND TROUBLESHOOTING

TM 11-7025-210-23

Table 4-1 . Fuse Locations and Circuits Protected

FUSE

LOCATION

CIRCUIT

4A MDA

XPS (F1) *

+157V

5A MDX

XPS (F2) *

10V

2A MDX

XPS (F3) *

+25V

2A MDX

XPS (F4) *

25V

7A MDX

XPS (F5) *

117V

1/8A PICO

LOG (F1) **

PHASE 1 CLOCK

1/8A PICO

LOG (F2) **

PHASE 2 CLOCK

4-11. STATUS INDICATORS AND TROUBLESHOOTING

The status indicators (fig. 4-2) are light emitting diodes (LED) on the outside edges of five printed wire boards. You can

see the indicators by removing the pedestal cover. An explanation of the condition that exists when each indicator is lit is

shown in figure 4-2. Troubleshooting with these indicators is defined in table 4-2.

Table 4-2 provides data for identifying a faulty PWB or other fault. This table lists various conditions in which the ALARM

indicator and the status indicators will be lit or blinking. For each condition of the indicators there is a list of probable

causes, corrective actions, and maintenance procedures. If the fault cannot be isolated and repaired with this information,

go to paragraph 4-12 and do further troubleshooting with the aid of table 4-3.

NOTE

Table 4-2 does not include every possible condition and probable

cause. You will be able to find other faults by noting which

indicators are lit or not lit and analysing the situation they

represent.

CAUTION

Replacement fuses must be the single strap type shown below.

4-6