Denon AVR-X8500H Service Manual page 102

3-3. Error Code H1-03 failure detection procedure
Checking device. [U2601 : MN864788]
Check the power supply voltage. (HDMI SW2)
Check item(14). Check the power supply voltage. :
Does the power supply voltage of the HDMI SW2 [U2601] indicate the correct voltage (1.1V)?
The test points are as follows.
HDMI SW2
162pin
U2601
YES
Check item(15).
Check the power components [U3605/U3601] and the pattern on
the substrate.
If there is no problem, remove the HDMI SW2 [U2601] from the sub-
strate and measure the voltage at the test point of
Is the voltage correct (1.1V or 3.3V)?
Replace with a new device.
Recheck from
If it does not work, replace the PCB.
NO
Check the power supply voltage. :
check item
YES NO
The power supply circuit is
faulty.
Replace the PCB.
check item (1).
Checking the reset waveform. (HDMI SW2)
Check item(16). Checking the reset waveform :
Check the waveform.
Is the TP waveform of the TP near the HDMI SW2 [U2601] correct
(like the one shown in the diagram) when the power is turned
on?
HDMI SW2
RESET
U2601
YES
(14).
check item (1) again after replacing [R2630/R2631] with a new
resistor.
If there is still a problem, the HDMI SW2 [U2601] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
102
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
NO
Check the reset circuit between
CPU [U6201] and HDMI SW2
[U2601].
If there is no problem, the HDMI
SW2 [U2601] is faulty.
Replace with a new device.
Recheck from check item (16).
If it does not work, replace the
PCB.