Marantz NR1506 /U1B Service Manual page 76

Can the NET3.3V output voltage (3.3 V)
to FET1013 (FET-SW) be confirmed?
Can the NET1.2V output voltage (1.2 V)
to U1007 (DC-DC Conv.) be confirmed?
Can the NET2.5V output voltage (2.5 V)
to U1008 (DC-DC Conv.) be confirmed?
Can the D1.8V output voltage (1.8 V) to
U1006 (DC-DC.Conv.) be confirmed?
Can the NET1.8V output voltage (1.8 V)
to FET1023 (FET-SW) 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 (U1013 uCOM 53 pin) "Hi"
?
YES
NO
Is E_POWER4 (U1013 uCOM 61 pin) "Hi"
?
YES
NO
Is E_POWER2 (U1013 uCOM 55 pin) "Hi"
?
YES
NO
Is D5V_POWER (U1013 uCOM 85pin)
"Hi" ?
YES
NO
Is E_POWER3 (U1013 uCOM 56 pin) "Hi"
?
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
The Ethernet software is faulty.
76
The circuit of E_POWER1 between
U1013 and FET1013 are faulty.
The circuit around FET1013 (FET-SW) is
faulty.
The circuit of E_POWER4 between
U1013 and U1007 are faulty.
The circuit around U1007(DC-DC.
Conv.) is faulty.
The circuit of E_POWER2 between
U1013 and U1008 are faulty.
The circuit around U1008(DC-DC.
Conv.) is faulty.
The circuit of D5V_POWER between
U1013 and U1006 are faulty.
The circuit around U1006(DC-DC.
Conv.) is faulty.
The circuit of E_POWER3 between
U1013 and FET1023 are faulty.
The circuit around FET1023 (FET-SW) is
faulty.