Power Troubles; Power Not Turn On; Fuse Is Blown; Trouble Shooting - Marantz SR7005 Service Manual

TROUBLE SHOOTING

1. POWER

1.1. Power not turn on

Power not turn on.
When the power turned on,
does the FLD on the front
panel light?
YES
About 10 seconds later,
does the sound where relay
enters?
NO
Is the fuse blown?
NO
Check voltage of N4905 (1-
5PIN) of HDMI B'D while the
ON/STANDBY indicator is
fl ashing red.
0.6V or -0.6V
Pull out connector (CP1) of
SPK BD, and check "Errors
checking mode".
(Refer to 21 page.)

1.2. Fuse is blown

Check for leaks or short
circuits in the primary side
parts, and replace any
defective parts.
NO
Is the fuse blown?
NO
Is a DC 5V voltage being
supplied from the SMPS B'D
(CX101) to the μ-com?
YES
Check μ-com periphery
circuitry of HDMI B'D and
replace any defective parts.
YES
s
YES
Refer to 1.2. Fuse is blown.
Check circuitry and parts from N4905 on
0V
the HDMI B'D to the μ-com for damage
and shortcircuits, and replace any
defective parts.
Fuse is blown
Check for short circuits in the
rectifi er diodes and circuitry of
the secondary side rectifying
circuits, and replace any
defective parts.
After repairing, also replace the fuse.
YES
Refer to 1.2.Fuse is blown.
Is a DC 5V voltage output
NO when the cord supplying the
power from the SMPS B'D
to the HDMI B'D (N4610) is
unplugged?
YES
Check circuitry and parts from
N4610 on the HDMI B'D to the
μ-com power supply for damage
and shortcircuits, and replace
any defective parts.
Are there any incomplete
connections in the connectors
connecting between the
various circuit boards?
YES
Connect the connectors properly.
Check for short circuits in
the power stabilizer unit's
regulator output terminal and
the ground, and replace any
defective parts.
43
Check for damage
in the SMPS B'D
NO
parts and replace any
defective parts.
NO
Check "Errors
checking mode".
(Refer to 21 page.)