Symptom:
Memory loss can occasionally occur if the following procedure is observed:

1. Program the memory with any desired information.
   
   
2. Allow the battery pack with to drain down over an extended period of time without turning off the transceiver. For example turn the volume control up and squelch off. After approximately 8 hours the battery voltage will drop to approximately 3 - 4 Vdc.
   
   
3. Turn off the POWER SW.
   
   
4. Connect a DC voltage supply or a fully charged battery pack.
   
   
5. Turn on the POWER SW.
   
   
6. Memory will have been lost.

Corrective Action:
Replace microprocessor IC206 with the improved part listed below. This part incorporates an software improvement to correct this symptom.

Parts required:

Qty   Description              Old part No.   New Part No.   Circuit Description
 1    Microprocessor           HD404629B17TF  HD404629B49TF  IC206

Time required for this modification is 60 minutes or less.