Help!
I have a field return unit with a bq20z80 V1.02. The customer complained of a "dead pack" (no charge, no discharge, no communication). The unit was in ROM mode when I looked at it. I sent a 0x08 command to take it out of ROM. The unit worked OK from then on.
The customer insists they did absolutely nothing to the unit.
The factory insists they did not break the process and do any manual operations to the unit.
The unit was #9 in a lot of 60. There were no issues with this lot. The test record indicates everything was normal. The unit was shut down at the end of the end-of-line test.
Has anyone ever heard of a unit that entered ROM mode without someone issuing the command? I need any help, insight or comments I can get. This is a major issue with my customer.
Thanks for everyone's help.
Phil