Marantz SR5014 Service Manual page 97

Check the I2C communication line. (HDMI Tx)
YES
Check item(3-1.4.). Check the I2C communication line :
Check the CPU.
Is the "I2C" waveform of the TP near the HDMI Tx [U1039]
correct (like the one shown in the diagram) when the power is
turned on?
HSDA
U1039
*The diagram shows an example.
HSCL
(Signal patterns vary depending on the tim-
ing.)
Points for checking waveforms
- Crest value (3.3V normally)
- Signal change
- SCL frequency (400kHz normally)
Voltage scale：1.0V/div
Time scale：10us/div
YES
HDMI Tx [U1039] is faulty.
Replace with a new device.
YES
Recheck from check item (3.1.).
If it does not work, replace the PCB.
NO
Check the HDMI Rx1. Check the HDMI Rx2.
Remove the damping resistor Remove the damping resistor
[R1061/R1062] of [U1000]. [R1169/R1170] of [U1003].
Is the "I2C" waveform correct? Is the "I2C" waveform correct?
YES YES
HDMI Rx1 [U1000] is HDMI Rx2 [U1003] is
faulty. faulty.
Replace with a new Replace with a new
device. device.
Recheck from check item (3.1.).
If it does not work, replace the PCB.
NO
Check item(3-1.5.). Check the I2C com-
munication line :
Check HDMI Rx [U1000 or U1003],
HDMI Tx [U1039] and CPU [U1018]
patterns as well as soldering.
If there is no problem, go to the next
step.
NO
Check the HDMI Tx.
Remove the damping resistor
[R1882/R1883] of [U1039].
Is the "I2C" waveform correct?
YES NO
HDMI Tx [U1039] is The CPU [U1018] is
faulty. faulty.
Replace with a new Replace with a new
device. device.
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