Marantz ND8006 Service Manual page 48

TROUBLE SHOOTING
1. POWER
1.1. The unit does not power on
When the power supply is connected to an AC power inlet, does
the on/standby indicator on the top of the power switch blink red
either immediately or after a certain amount of time has elapsed?
NO
Is the device operating without the OLED illuminating?
If pressing the "OPEN/CLOSE" button operates the tray, there may be a malfunction in the OLED or
display board.
NO
Is the MAIN FUSE[F8100] blown out?
NO
TO "1.2. Power Connection Wiring Abnormalities"
1.2. Power Connection Wiring Abnormalities
Check the connection.
Has a contact failure occurred or is a connector missing?
POWER PCB to DIGITAL PCB [N1004, N1012, N3504]
NO
TO "1.3. Power Supply Voltage Abnormalities"
YES
Can the device be started up and can "Protection History" from
"1-3. Protection History Display Mode" be checked?
NO
TO "1.2. Power Connection Wiring Abnormalities".
YES
TO "2.1. OLED is not
YES
If the fuse [F8100] breaks again after it has been replaced, there may be a short or overload in the
power supply.
TO "1.3. Power Supply Voltage
YES
Check if the connectors are connected as indicated in the wiring diagram and adjust the connections if
necessary.
If this does not re-establish contact in the wiring, replace the Wire Assy unit or the circuit board which
the wires are mounted on.
48
YES
Check the protection type.
[DC PROTECTION1]
A power supply short circuit was detected in power PCB.
Check the PCBs.
[DC PROTECTION2]
A power supply short circuit was detected in audio PCB.
Check the PCBs.
lit"
Abnormalities"