Marantz AV8003 Service Manual page 22

Check 4
HD Radio Error Detection (/u1B only)
Error Detection
"CPU <-> HDR"
on the FL DISPLAY
"HDR <-> HDRM"
on the FL DISPLAY
No error message
Not possible to up/down.
No error message
No sound
or Noisy
Reason
Main-CPU to
HD Radio-CPU communication fail
Module to
HD Radio-CPU communication fail
RF tuner (front-end) control fail
Audio signal path
RF signal condition
Module
Check 4
HD Radio Error Detection ( /U1B のみ )
Check points
6V power supply
5V power supply
HD Radio-CPU
Communication
Module CPU fail
Communication
3.3V power supply IC95
12V power supply
Module fail
Audio signal path
Antenna
Module fail
20
CN92, IC61, BN92
IC94
IC91, X901 etc.
CN91, JW29
HD Radio module
BN91, IC93
BN91, CN91, IC50
HD Radio module
BN91, CN91 etc
RF signal level, terminal
External interference
Module performance