Marantz NR1200 Service Manual page 79

3-1. Error Code H1-01 failure detection procedure
Checking device. (HDMI Rx/Tx)
Check the power supply voltage. (HDMI Rx/Tx)
Check item(3-1.1.). Check the power supply voltage. :
Does the power supply voltage of the HDMI Rx/Tx [U1027] indicate the correct voltage (1.1V, 3.3V)?
The test points are as follows.
112 pin
U1027
38 pin
1.1V
3.3V
YES
Check item(3-1.2.).
Check the power components [U1064/U1067/Q1079] and the pat-
tern on the substrate.
If there is no problem, remove the HDMI Rx/Tx [U1027] from the
substrate and measure the voltage at the test point of
(3-1.1.).
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 (3.1.).
Checking the reset waveform. (HDMI Rx/Tx)
Check item(3-1.3.). Checking the reset waveform :
Check the waveform.
When the power is turned on, is the TP waveform correct (as
shown in the figure)?
115 pin
U1027
YES
79
Examples of confirmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
NO
Check the reset circuit between
CPU [U1013] and HDMI Rx/Tx
[U1027].
If there is no problem, the HDMI
Rx/Tx [U1027] is faulty.
Replace with a new device.
Recheck from check item
If it does not work, replace the
PCB.
Go to next page.
(3.1.).