Trouble Shooting; Power Not Turn On; Fuse Is Blown - Denon AVR-2308CI Service Manual

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TROUBLE SHOOTING

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1. POWER

1.1. Power not turn on

Power not turn on
YES
Are there any incomplete con-
Is the ON/STANDBY indicator YES nections in the connectors con-
on the front panel flashing red? necting between the various
circuit boards?
YES
Connect the connectors prop-
NO
erly.
NO
Is the fuse blown? Refer to Fuse is blown
YES
Is a DC 6V voltage being sup-
Does the power turn on when
plied from the 1U-3857-3 board
NO
the POWER switch is turned off
(CX126 pins 7 and 8) to the
then back on?
microprocessor?
YES YES
T E
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Check the primary circuitry
Check the 1U-3857-1 board's
parts including the POWER
microprocessor periphery cir-
switch (for poor contacts, etc.),
cuitry and replace any defec-
and replace any defective
tive parts.
parts.

1.2. Fuse is blown

Fuse is blown
YES YES
Check for short circuits in the
Check for leaks or short circuits rectifier diodes and circuitry of
in the primary side parts, and the secondary side rectifying
replace any defective parts. circuits, and replace any defec-
tive parts.
YES YES
After repairing, also replace the fuse.
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Is there a short circuit between Correct the
NO YES
the speaker terminals and the between the speaker and the
ground? ground.
NO
Check for damage in the power
amplifier circuitry parts and
replace any defective parts.
Is a DC 6V voltage output when
the connector supplying the Check the parts from IC501 to
NO NO
power from the 1U-3857-3 the primary
board to the microprocessor replace any defective parts.
(CX126) is unplugged?
YES
Check the circuitry and parts
from CX126 on the 1U-3857-3
board to the microprocessor for
damage and short-circuits, and
replace any defective parts.
YES
Check for short circuits in the
power stabilizer unit's regula-
tor output terminal and the
ground, and replace any defec-
tive parts.
YES
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YES
short circuit
YES
NO
NO
YES
NO
circuitry and
YES
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YES
YES
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AVR-2308CI / AVR-888 / AVR-2308 / AVC-2308
9 2 4 9 8
NO
YES NO
NO
YES YES
5 1 5 0 8 9 2 4 9
YES YES
YES YES
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2 9 9
YES
NO
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