9
CHECK E2P I F
CHECK POW5
PROTECT
5. SYSTEM ERROR
1. Trouble in EEP-ROM (INPUT PWB / IC12) Interface
• If the communication error that ACK did not return by communication with EEP-ROM(INPUT PWB / IC12) occurred 2
seconds and more.
CHECK POINTS OF SCHEMATIC
1. Turn the power on. Are the IIC Clock Line (IC11/22pin-IC12/6pin) normal ?
2. Turn the power on. Are the IIC Data Line (IC11/23pin-IC12/5pin) normal ?
3. Is 5VL(+5V) voltage supplied to 8pin of IC12 ?
4. When no problem to the above 1-3, please replace IC12
2. Trouble in +5V Supply
• If 5VD(+5V) inputted into 68pin of IC11 is trouble and the following the fault of 1-4.
CHECK POINTS
1. Turn the power on. Is 5VD(+5V) voltage supplied to CN98/1pin and CN98/2pin of INPUT PWB.
2. Is the signal of IC11 "H" ? 29pin(Power Amp Fail)="H". (When 2 second or more "L" state is continuing to 29pin,
Abnormalities have occurred in the Power Amp circuit.)
3. Is the signal of IC11 "H" ? 66pin(Power Line Fail)="H". (When 2 second or more "L" state is continuing to 66pin,
Abnormalities have occurred to +/-12V power supply or the power supply for Power Amp.)
4. Is the signal of IC11 "H" ? 112pin(Power Down)="H". (When 2 second or more "L" state is continuing to 112pin,
Abnormalities have occurred to in IC96 and around IC 96 circuit of MAIN PWB
3. Trouble in Protection
• When unusual states, such as overload of Power Amp and DC output, are detected. The unusual detection method is the
following.
A. When "L" is detected in IC11 29pin(Power Amp Fail), the set is put into the state of STANDBY. At this time, when the
detection time of 29pin is less than 200msec, STANDBY LED on Front Panel is put into the state of blinking at 0.5sec
intervals. After the AC code is pulled out and opened once to make it to power supply ON again when entering this state,
it does with the remote control or Standby button of Front Panel.
To Next Page
Loading...
