Marantz SR6009/U1B Service Manual page 100

Can an output voltage (3.3V) to
Q1252(FET_SW) be confirmed?
Can an output voltage (1.2V) to IC115
be confirmed?
s
Case of CX870 model
Can an output voltage (1.9V) to
IC116(DC-DC Conv.) be confirmed?
Case of CY920 model
Can an output voltage (2.5V) to
IC116(DC-DC Conv.) be confirmed?
s
Case of CY920 model
Can an output voltage (1.8V) to
IC114(DC-DC Conv.) be confirmed?
s
Can an output voltage (1.8V) to
Q1111(FET_SW) be confirmed?
Are the versions of the Ethernet SBL and IMG displayed in Version
Check Mode?
s
The circuit around CX870 or CY920 is faulty.
NO
Is E_POWER1 (IC151 uCOM 53pin)
"Hi" ?
YES
NO
Is E_POWER4 (IC151 uCOM 56pin)
"Hi" ?
YES
NO
Is E_POWER2 (IC151 uCOM 54pin)
"Hi" ?
YES
s
NO
Is D5V_POWER (IC151 uCOM 85pin)
"Hi" ?
YES
s
NO
Is E_POWER_4 (IC151 uCOM 56pin)
"Hi" ?
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
The Ethernet software is faulty.
100
The circuit of E_POWER1 between
IC151 and Q1252 are faulty.
The circuit around Q1252(FET_SW) is
faulty.
The circuit of E_POWER4 between
IC115 and IC151 are faulty.
The circuit around IC115(DC-DC.
Conv.) is faulty.
The circuit of E_POWER2 between
IC151 and IC116 are faulty.
The circuit around IC116(DC-DC.
Conv.) is faulty.
s
The circuit of D5V_POWER between
IC151 and IC114 are faulty.
s
The circuit around IC114(DC-DC.
Conv.) is faulty.
s
The circuit of E_POWER_4 between
IC151 and Q1111 are faulty.
s
The circuit around Q1111(FET_SW) is
faulty.