6. TROUBLESHOOTING page 25
Model PRM-470B
6.2. TROUBLESHOOTING GUIDE
This guide is designed so that repairs can be made to the PRM by qualified service personnel and
the instrument returned to service within a minimum time. It emphasizes board and assembly
replacement.
General problems include inoperable switches, batteries that fail to charge, failed audio, broken
wires, etc. Intermittent problems are often caused by loose or broken wires or loose connections.
Perform a physical inspection of the instrument, looking for faulty or broken wiring, foreign
material, broken or damaged components, and loose connections.
Refer to the appropriate drawings (Appendix F.) for location of components as they are noted
while using these procedures.
The following tools and equipment are needed for these procedures:
• Phillips screwdriver
• Slotted screwdriver
• Oscilloscope
• High voltage probe (>1,000 megohms)
• Nut-driver set
• DVM
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