Trouble Shooting; Power - Marantz SR5010/U1B Service Manual

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
Does the power display on
the front panel lights green
after approximately 10
seconds?
NO
Is a fuse blown?
NO
Check the voltage of pins 1,
3 - 7 of N1019 on the HDMI
PCB while the power display
is flashing in green or white.
0.6V or -0.6V
Remove the connector (CP4001) of the SPEAKER PCB.
Check the "3.5. Protection history display mode"
(See page 44)
1.2. Fuse is blown
Check for leaks and short
circuits in the parts on the
primary side. Replace any
faulty parts.
Does the power indicator on
NO
the front panel flash in red
when the power is turned on?
NO
Is a fuse blown?
NO
Is DC 5 V being sup-
plied from the SMPS PCB
(CN4141) to the HDMI PCB?
YES
Check the circuits around
the Microprocessor on the
HDMI PCB and replace any
faulty parts.
YES
YES
See "1.2.Fuse is blown."
Check the circuits around the Micropro-
0V
cessor on the HDMI PCB and replace any
faulty parts.
Blown fuse
Check the rectifier diode in
the rectifier circuit on the
secondary side, and check
for short circuits. Replace
any faulty parts.
Replace the fuse after repair.
YES
YES
See "1.2.Fuse is blown."
Is DC5V output even when
NO
the connector (N1033)
supplying power from the
SMPS PCB to the HDMI PCB
is removed?
YES
Check for breakages and short
circuits in the circuits and parts be-
tween N1033 on the HDMI PCB and
the microprocessor power supply
and replace any faulty parts.
Are there any parts not fully
connected into the connec-
tors that connect the PCBs?
YES
Connect the connectors correctly.
Check for short circuits between
the regulator output terminal and
GND in the power supply stabili-
zation circuit. Replace faulty parts
if there is a short circuit.
73
NO
TO "6.SMPS"
(See page 88)
NO To "3.5. Protection
History Display Mode"
(See page 44)