Error Code H1-12 Failure Detection Procedure - Denon AVR-X6400H Service Manual

3-12. Error Code H1-12 failure detection procedure

Checking device. [U7004 : PCM9211]
Checking the reset waveform. (DIR)
Check item(42). Checking the reset :
Check the CPU.
Is the waveform of the TP near the DIR [U7004] correct (like the one
shown in the diagram) when the power is turned on?
U7004
34 pin
YES NO
Check the reset circuit between CPU [U6201] and DIR [U7004].
If there is no problem, the DIR [U7004] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
Check the communication line. (DIR)
Check item(43).
Check the CPU.
Is the waveform of the TP near the DIR [U7004] correct (like the one
shown in the diagram) when the power is turned on?
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
U7004
YES
DIR [U7004] is faulty.
Replace with a new device.
Recheck from
If it does not work, replace the PCB.
115
YES
Check the communication line :
23pin:MISO
24pin:MOSI
25pin:CLK
26pin:CS
NO
Check item(44). Check the communication line :
Check DIR [U7004], CPU [U6201] patterns as well as soldering.
If there is no problem, go to the next step.
check item (1).
*The diagram shows an example.
(Signal patterns vary depending on the tim-
ing.)
Points for checking waveforms
- Crest value (3.3V normally)
- Signal change
- CLOCK frequency (about 2MHz)
Voltage scale : 2.0V/div
Time scale : 2us/div