Denon AVR-X1200W Service Manual page 82

Can the NET3.3V output voltage (3.3 V)
to Q7404 (FET-SW) be confirmed?
Can the NET1.2V output voltage (1.2 V)
to IC743 (DC-DC Conv.) be confirmed?
Can the NET2.5V output voltage (2.5 V)
to IC742 (DC-DC Conv.) be confirmed?
Can the NET1.8V output voltage (1.8 V)
to Q7402 (FET-8W) be confirmed?
Are the versions of the Ethernet SBL and IMG displayed in Version
Check Mode?
The circuit around CY920 is faulty.
NO
Is E_POWER1 (IC751 uCOM 53 pin) "Hi"
?
YES
NO
Is E_POWER4 (IC751 uCOM 61 pin) "Hi"
?
YES
NO
Is E_POWER2 (IC751 uCOM 55 pin) "Hi"
?
YES
NO
Is E_POWER3 (IC751 uCOM 56 pin) "Hi"
?
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
The Ethernet software is faulty.
82
The circuit of E_POWER1 between
Q7404 and IC751 are faulty.
The circuit around Q7404 (FET-SW) is
faulty.
The circuit of E_POWER4 between
IC751 and IC743 are faulty.
The circuit around IC743(DC-DC.Conv.)
is faulty.
The circuit of E_POWER2 between
IC751 and IC741 are faulty.
The circuit around IC742(DC-DC.Conv.)
is faulty.
The circuit of E_POWER3 between
IC751 and Q7402 are faulty.
The circuit around Q7402 (FET-SW) is
faulty.