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TROUBLE SHOOTING
1. POWER
1.1. The unit does not power on
The unit does not power on
Does the power indicator on the front panel
flash in green or white when the power is turned
on?
YES
YES
Is a fuse blown?
See
"1.2. Fuse is
NO
Is DC 5V being supplied from the SMPS PCB
[N6513] to the DIGITAL PCB?
YES
Check the circuits around the Microprocessor
on the DIGITAL PCB and replace any faulty
parts.
Does the power display on the front panel lights
green after approximately 10 seconds?
NO
YES
Is a fuse blown?
See
"1.2. Fuse is
NO
Check the voltage of [N6012 18, 19, 22 pin] on
the DIGITAL PCB while the power display is flash-
ing in green or white.
0.6V or -0.6V
Remove the connector [N6012] of the SPEAKER PCB.
Check the
"3-2. Protection History Display
Mode"
NO
Does the power shut down after several
seconds?
NO
blown"
TO
"6.
SMPS"
NO
NO
Is DC5V output even when the connector
[N6001] supplying power from the SMPS PCB
to the DIGITAL PCB is removed?
YES
Check for breakages and short circuits in the
circuits and parts between [N6001] on the
DIGITAL PCB and the microprocessor power
supply and replace any faulty parts.
YES
Are there any parts not fully connected into
the connectors that connect the PCBs?
YES
blown"
Connect the connectors correctly.
0V
Check the circuits around the Microprocessor
on the DIGITAL PCB and replace any faulty
parts.
1.2. Fuse is blown
YES
Check the rectifier diode in the
Check for leaks and short
rectifier circuit on the second-
circuits in the parts on the pri-
ary side, and check for short
mary side. Replace any faulty
circuits. Replace any faulty
parts.
parts.
Replace the fuse after repair.
NO
TO
"3-2. Protection History
Display
Mode"
83
Blown fuse
Check for short circuits between
the regulator output terminal and
GND in the power supply stabiliza-
tion circuit. Replace faulty parts if
there is a short circuit.
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