System Error - Marantz SR7300 Service Manual

12. SYSTEM ERROR

The CPU inside the unit monitors peripheral interfaces and if a trouble is detected the following information is displayed on
the FLD.
1. Trouble in DSP
If communication with DSP is troubled more than 2 seconds, FLD shows below.
C H E C
* This display stays and sound is muted.
2. Trouble in RS-232C
If communication with RS-232C of panja system is troubled more than 2 seconds, FLD shows below.
C H E C
3. Trouble in EEPROM
If data from EEPROM(QU70) does not match, FLD shows below.
C H E C
* After displaying it, Back-up Data is reset to default.
4. Trouble in EEPROM I/F
If communication with EEPROM(QU70) is troubled more than 2 seconds, FLD shows below.
C H E C
5. Trouble in 5V Supply
If 5V supply to P604(DSP/CPU PCB) is troubled, FLD shows below.
C H E C
6. Trouble in Power Amplifi er
If DC offset, over-current, over-heat, trouble in main transformer is detected, FLD shows below.
P R O T
* If a trouble is detected upon power on, CPU turns off the speaker relay. And if the trouble is not recovered within
2 seconds, CPU turns the unit into stand-by. If DC offset or over-current is detected on power on status, the
speaker relay is turned off, and if over-heat, trouble in main transformer is detected, the unit turns into stand-by
immediately.
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