Denon HEOS HomeCinema HS2 Service Manual page 48

TROUBLE SHOOTING for Subwoofer
1. The unit does not power on
Does a blue or Amber light illuminate on the indi-
cator on the back of the subwoofer when the AC
cord is connected?
NO
Check the voltage.
[TP28] 24V
OK
Check the voltage.
[TP26] 5V
OK
Check the voltage.
[TP17] 3.3V
[TP19] 3.3V
OK
Main (Sub) PCB
The circuit around [LED1] is faulty.
(Subwoofer)
YES
Is there an incomplete connection between the
board connectors?
NG
SMPS (Sub) module
The circuit around [J1]or [SMPS module] is faulty.
NG
Main (Sub) PCB
The circuit around [U5] is faulty.
NG
Main (Sub) PCB
The circuit around [U1] is faulty.
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