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Table 4-1. TROUBLESHOOTING (cont.) - 506780087
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TM-5-4120-359-14 Air Conditioner Split Package 18 000 BTU/HR Cooling 30 000 BTU/HR Heating 208 Volt 3 Phase 400 Hertz Manual
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Table 4-1. TROUBLESHOOTING (cont.) - 506780089
TM 5-4120-359-14
TM 5-21
Table 4-1. TROUBLESHOOTING (cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 10.
Check electrical fuse F1.
(a) Remove power
(b) Remove top cover, evaporator. (See para 3-21.)
(c) Remove fuse from fuseholder (on left side of electrical module assembly).
(d) Examine fuse and test for continuity.
Replace if bad.
Step 11.
Check transformer T1 output.
WARNING
The following test must be conducted with the power on.
Exercise extreme
caution.
(a)
Apply power.
(b)
Measure ac voltage between T1-7 and T1-8.
(c)
If 27 to 33 Vac is indicated, go to step 12.
(d)
If not, check transformer input.
(e)
If 197 to 229 Vac is indicated,
Replace transformer
(f) If 197 to 229 Vac is not indicated, use electrical schematic (figure 4-2) or wiring diagram
(figure 4-3) and locate defect.
Repair or replace defects as indicated.
Step 12.
Check rectifier CR1 and wiring harness.
(a) Disconnect P4 from J4 (left side of electrical module assembly).
4-6 Change 3

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