TROUBLE SHOOTING
1. POWER
1.1. The unit does not power on
YES
YES
YES
NO
YES
NO
NO
Does the indicator on the
front panel ash in blue
when the power is turned
on?
Check TS92 connection or
impedance.
Short : Normal temperature
Open : High temperature
Does the indicator on the
front panel change to light-
ing in blue or orange after
approximately 20 seconds?
The unit does not power on
Has a fuse broken?
Is DC5V being supplied
from the SMPS PCB (BN21-
3pin) to the DIGITAL PCB?
See "
1.2.Fuse is blown.
"
Are any parts damaged?
(IC96,IC21,IC22,IC98,IC99)
Connect the connectors cor-
rectly.
Is IC91 (ICE3BR0665J)
damaged?
Is +3.3V_CPU being
supplied from the IC14
(NJM2831F33) to the MCU?
Are there any short circuits
caused by the soldering of
the PCB?
Check the damage of each part.
Replace the damaged part(s).
Replace the IC91 (ICE-
3BR0665J) and D912 / D904 /
D905 / D907.
NO
YES
YES
NO
NO
YES
Repair the short circuited area(s)
by the soldering of the PCB.
YES
YES
Check the circuits around
the Microprocessor on the
DIGITAL PCB and replace
any faulty parts.
Are any parts damaged?
NO
Check the damage of each part.
Replace the damaged part(s).
YES
Check IC11(MCU) 25pin
(DC_PROTECT) 3.3V ?
POWER FAULT Detection
If detect the POWER FAULT
then power down.
Check the power (+5V_
D,+3.3VE,+8V_A,-8V_
A,+5V_A,+12V_D).
Are any parts not fully con-
nected in the connectors that
connect the PCBs?
3.3V
NO
NO
Is +5V_D_ON/OFF being Low
voltage(0V)?
Core Module power on control
from MCU.
Is 8V_ON/OFF being high
voltage(3.3V)?
Audio power on control from
Core Module.
0V
3.3V
Core Module power off (Deep
sleep mode)
Audio power off (Network stand-
by mode)
0V
25
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