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minolta normally use the following code to get into the service mode so you can reset back to defaults. Be warned you can damage the machine further by doing this.
A. Procedure
1. Press the Utility/Counter key.
2. Touch [Details] on Meter Count display.
3. Press the following keys in this order.
Stop → 0 → 0 → Stop → 0 → 1
This all depends on age of machine.
Thanks Jason