Marantz NR1605/U1B Service Manual page 88

Can a voltage (5V) be confirmed between pin 2 and pin 5 of
N1029?
Can an output voltage (3.3V) to
U1070(DC-DC Conv.) be confirmed?
Can an output voltage (3.3V) to
Q1071(FET_SW) be confirmed?
Can an output voltage (1.2V) to U1067
be confirmed?
Can an output voltage (1.9V) to U1069
be confirmed?
Are the versions of the Ethernet SBL and IMG displayed in Version
Check Mode?
The circuit around CX870 is faulty.
YES
NO
Is D5V_POWER (U1018 uCOM 85pin)
"Hi" ?
YES
NO
Is E_POWER1 (U1018 uCOM 53pin)
"Hi" ?
YES
NO
Is E_POWER4 (U1018 uCOM 53pin)
"Hi" ?
YES
NO
Is E_POWER2 (U1018 uCOM 54pin)
"Hi" ?
YES
YES
NO
The circuit between the AC inlet and N1029
is faulty. Check the SMPS PCB.
NO
YES
NO
YES
NO
YES
NO
YES
NO
The Ethernet software is faulty.
88
The circuit of D5V_POWER between
U1018 and U1070 are faulty.
The circuit around U1070(DC-DC.
Conv.) is faulty.
The circuit of E_POWER1 between
U1018 and Q1071 are faulty.
The circuit around Q1071(FET_SW) is
faulty.
The circuit of E_POWER4 between
U1018 and Q1071 are faulty.
The circuit around U1067(DC-DC.
Conv.) is faulty.
The circuit of E_POWER2 between
U1018 and U1069 are faulty.
The circuit around U1069(DC-DC.
Conv.) is faulty.