Denon AVR-S650H

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 [IC721] indicate the correct voltage (1.1V, 3.3V)?
The test points are as follows.
IC721
112pin
38pin
1.1V
3.3V
Check item(3-1.2.). Check the power supply voltage. :
Check the power components [IC741/IC744/Q7417] and the pattern
on the substrate.
If there is no problem, remove the HDMI Rx/Tx [IC721] from the
substrate and measure the voltage at the test point of check item
(3-1.1.).
Is the voltage correct (1.1V or 3.3V)?
Replace with a new device.
The power supply circuit is
faulty.
Replace the PCB.
Recheck from check item (3.1.).
If it does not work, replace the PCB.
3-1. Error Code H1-01 failure detection procedure
NO
NOYES
Go to next page.
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 [788_RST] waveform cor-
rect (as shown in the gure)?
IC721
788_RST
Check the reset circuit between
CPU [IC751] and HDMI Rx/Tx
[IC721].
If there is no problem, the HDMI
Rx/Tx [IC721] is faulty.
Replace with a new device.
Recheck from check item (3.1.).
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
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
80