Marantz NR1508 - Page 81

Checking device. (HDMI Rx/Tx)
Check the power supply voltage. (HDMI Rx/Tx)
Check item(5). 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.
U1027
112 pin
38 pin
1.1V
3.3V
Check item(6). Check the power supply voltage. :
Check the power components [U1064, U1067, Q1082] 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 check item (5).
Is the voltage correct (1.1 V or 3.3 V)?
Replace with a new device.
The power supply circuit is
faulty.
Replace the PCB.
Recheck from check item (1).
If it does not work, replace the PCB.
3-1. Error Code H1-01 failure detection procedure
NO
NOYES
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Checking the reset waveform. (HDMI Rx/Tx)
Check item(7). Checking the reset waveform :
Check the waveform.
When the power is turned on, is the TP waveform correct (as
shown in the gure)?
U1027
115 pin
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 (1).
If it does not work, replace the
PCB.
NO
Examples of conrmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
YES
YES
81
Caution in
servicing
Electrical Mechanical Repair Information Updating