Marantz NR1509 Service Manual page 86

3-2. Error Code H1-02 failure detection procedure
Checking device. (HDMI SW)
Checking the reset waveform. (HDMI SW)
Check item(10). 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
U1024
YES
Check item(11). Checking the HDMI SW :
Remove the [R1974/R1975].
Is the waveform of "I2C" the correct waveform?
YES
HDMI SW [U1024] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
Examples of confirmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
NO
Check the reset circuit between
CPU [U1013] and HDMI SW
[U1024].
If there is no problem, the HDMI
SW [U1024] is faulty.
Replace with a new device.
NO
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