Despatch 926E Equipment Manual (C-155)Rev 2/11 - Manual (Page 43)

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Corrective Maintenance
The purpose of corrective maintenance is to locate test chamber malfunctions and to
apply proper repair procedures. The following procedure is used in troubleshooting the
test chamber.
1.
Insure that all switches are in the proper position.
2.
Check first for blown fuses and proper AC power connection.
3.
Check coolant lines for proper plumbing. Check that all line valves are open.
Make sure that the coolant lines are not clogged.
4.
Check the coolant cylinders to be sure that they contain an adequate coolant gas
supply.
Components in the temperature test chamber are removed and replaced as follows:
Repair is limited to the replacement of defective parts.
1.
Disconnect AC power.
2.
Remove screws holding plenum
plate.
3.
Carefully allow plenum plate away
from the heater assembly.
CAUTION: ATTENTION: Care should be taken not to
damage or disturb the location of the
thermocouples.