GLENTEK Inc. 208 Standard Street, El Segundo, California 90245, U.S.A. (310) 322-3026
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CHAPTER SEVEN: MAINTENANCE, REPAIR AND WARRANTY
7.1 MAINTENANCE:
The GA45xxPR2 amplifiers do not require any scheduled maintenance. The only wear-out items are the
cooling fans which are specified to have in excess of 15,000 hours MTBF by their manufacturer.
7.2 REPAIR:
If your system exhibits a problem, this manual should assist you to identify the fault and to replace the
defective component or sub-assembly. It is Glentek’s recommendation that only major assemblies be re-
placed in the field and the assemblies be returned to Glentek for failure analysis and repair. However,
appendices B and C contain complete system schematics that, in case of extreme emergency, should permit a
skilled electronic technician to trouble shoot the circuit boards to levels lower than those recommended as
replaceable.
7.2.1 FAULT TRACING:
This section will aid in the location of defective replaceable components and assemblies. A list of the
fault tracing charts in Appendix A, along with the observable fault follows:
Fault Chart 1: Motor does not turn in either direction.
Fault Chart 2: Motor only turns in one direction.
Fault Chart 3: Motor does not develop maximum output speed (no load applied) in either direction.
Fault Chart 4: Motor does not develop maximum output torque in either direction.
Fault Chart 5: Motor wanders and hunts or does not track smoothly.
7.2.2 FAULT TRACING CHARTS:
The fault tracing charts in Appendix A start with an observable fault listed at the top of each chart. Fol-
low the line connections between blocks by your answers to the questions noted in the diamond shape
blocks until the defective part is isolated. The charts are to be used only as a guide to identify the parts or
assemblies that Glentek recommends as the lowest level of repair.
The fault tracing procedures assume that only a single failure mode exists.
7.2.3 PART REPLACEMENT:
The removal and replacement of the defective assembly can be accomplished with standard shop pro-
cedures. The assemblies that may be easily removed are as follows:
1. Fuses F1-F4.
2. Amplifier Control board.
3. Rectifier BR301-BR303.
4. Transformer T301.
5. Capacitors C301-C302.
6. Fan 201.
After reviewing the fault tracing charts you may conclude that the complete amplifier should be re-
turned to Glentek for failure analysis, repair and retesting to specifications. This is particularly true with fail -
ure modes in the amplifier power section.
7.2.4 OVER TEMPERATURE SHUTDOWN:
When the heatsink temperature has reached a level that, if exceeded, would damage the output tran-
sistors, the Temp indicator LED is latched ON and the Drive Inhibit indicator LED is latched ON inhibiting
the amplifier.
CHAPTER SEVEN: MAINTENANCE, REPAIR, AND WARRANTY
