Thermo Scientific 3881, Руководство по эксплуатации и техническому обслуживанию

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7033881 Blood Bank 5-3 Thermo Scientific
Section 5
Troubleshooting
Symptom Possible Cause/Possible Fix
Chamber not being refrigerated or refrigera-
tion is insufficient to provide stable tempera-
ture of 4°C; compressor is operating intermit-
tently; condenser fan is not operating.. Condenser fan motor is defective.
Fan blade is obstructed.
Possible defective temperature control.
Chamber not being refrigerated or refrigera-
tion is insufficient to provide stable 4°C tem-
perature; compressor is operating intermit-
tently; condenser fan is operating continuous-
ly. Power line voltage is insufficient.
Defective compressor thermal overload
switch.
Air-cooled condenser is dirty.
Inadequate ventilation at top of cabinet.
Ambient temperature near the cabinet is too
high.
Compressor starting relay is defective.
Refrigerator is operating at 4°C but the alarm
selector keyswitch cannot be set to the
Normal position without the alarm system
activating; temperature pilot lights (normal,
high, low) are out. Performance monitor circuit board is defec-
tive.
Performance monitor system transformer (cir-
cuit board power) is defective.
Possible defective probe or loose probe wires.