Denon AVR-S750H - Page 98

YES
YES
YES
YES
Check the I2C communication line. (ARC IC)
Check item(3-7.4.). Check the I2C communication line :
Check the CPU.
Is the waveform of the TP near the ARC IC [IC724] correct (like
the one shown in the diagram) when the power is turned on?
IC731
A_DA
A_CK
ARC IC [IC724] is faulty.
Replace with a new device.
ARC IC [IC724] is faulty.
Replace with a new device.
Recheck from check item (3.1.).
If it does not work, replace the PCB.
Check item(3-7.5.). Check the I2C com-
munication line :
Check ARC IC [IC724] patterns as well
as soldering.
If there is no problem, go to the next
step.
Recheck from check item (3.1.).
If it does not work, replace the PCB.
NO
*The diagram shows an example.
(Signal patterns vary depending on the tim-
ing.)
Points for checking waveforms
- Crest value (3.3V normally)
- Signal change
- SCL frequency (400kHz normally)
Voltage scale : 1.0V/div
Time scale : 10us/div
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
98