How to fix code M4 error
Service mode, first
1.Press the Utility key.
2. Press the Meter Count key.
3. Press the following keys in this order:
Stop 0 0 Stop 0 1
for security "Stop 9"
In Security, Select Copy Kit
1. Touch "Set."
2. Press the Clear key to clear the current setting.
If the setting is accidentally cleared, press the Interrupt key to
undo the clearing operation.
3. Enter the desired value from the 10-Key Pad.
4. Touch "Current."
5. Press the Clear key to clear the current value.
If the current value is accidentally cleared, press the Interrupt key
to undo the clearing operation.
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