Cpu Version Check - Marantz MM8077 Service Manual

1. CPU Version check

The firmware version is displayed on LEDs as follows.
V1(D407) V2(D406)
ON
OFF
ON
OFF
ON
OFF
ON
1.1. Protection Log display
The last time protection log is displayed on LEDs as follows if the Service button is pushed(>5sec) in the Service
mode. For detail and coping process, please refer to "sYsTEM ERROR".
V1(D407)
OFF
OFF
OFF
OFF
ON
ON
ON
ON
V3(D405)
OFF OFF
ON OFF
ON OFF
OFF ON
OFF ON
ON ON
ON ON
V2(D406) V3(D405)
OFF OFF
OFF ON
ON OFF
ON ON
OFF OFF
OFF ON
ON OFF
ON ON
Version
Ver1
Ver2
Ver3
Ver4
Ver5
Ver6
Ver7
Cause of protect
No protection log
Detection of over current over 200msec on Power AMP
Detection of DC on Power Amp output
Detection of over current below 200msec on Power
Amp
Detection of abnormality on +/-38V, +/-15V supply
or power amp supply
Detection of abnormal heat of Power Amp
16
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