System Error - Marantz SR6004 Service Manual

5. SYSTEM ERROR

Check 1
• Indication of abnormalities with the EEP-ROM
(HDMI PWB / IC89) Interface
This indicates a communication error wherein the ACK will
not return for 2 seconds or more while the system is in com-
munication with the EEP-ROM (INPUT PWB / IC89).
- Message on FL displayw.
Points to be checked
1. The IIC Clock Line (IC105/116 pin . IC89/6 pin) is normal
when the power is ON.
2. The IIC Data Line (IC105/117 pin . IC89 / 5 pin) is normal
when the power is ON
3. The IC89/8 pin is supplied with VCC +3.3V.
4. If none of the above is negative, the IC89 may be having
a defect.
Check 2
• +5V supply Error Detection (_5V DOWN)
When the power is turned on or while the unit is in normal
operation, an abnormality occurs with the +5V power
supply, and the +5V power into the CPU 137 pin cannot be
detected.
• Detection of DC on Power Amp Output
(_P AMP FAIL)
When the power is turned on or while the unit is in normal
operation, an abnormality occurs with the Power Amp, and
DC is detected on the CPU 121 pin.
• Detection of abnormal heat of Power Amp
(_P AMP FAIL)
The Power Amp is overheated while in normal
operation,with an abnormality detected on the CPU 121
pin.
• Detection of Overcurrent below 200msec on
Power Amp (_P CUR FAIL)
When the product is in normal operation, an abnormality
occurs with the POWER AMP, and an overcurrent of less
than 200msec is detected on the CPU 120 pin.
When errors like the above abnormalities are detected, the
software automatically puts the product into STANDBY
mode, with the STANDBY LED flickering approximately
every 500msec.
NOTE : The product can recover from the SYSTEM ER-
ROR when the user turns on and then off the
STANDBY. However, once any of the above errors
is redetected, the product goes into STANDBY
again.
Points to be checked
1. The CN81 (HDMI PWB) 7 & 8 pins are supplied with +5V
when the power is ON
2. The CN85 10pin (Power Amp Fail) is outputting the "H"
signal; (If the 10 pin continues to be in the "L" state for 2
seconds or more after the power is turned ON, the Power
Amp circuit is having a problem.)
C H E C K E 2 P I F
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