17
DHT-390XP
AVR-390
TROUBLE SHOOTING
1. POWER
1.1. Power not turn on
1.2. Fuse is blown
Power not turn on
Is the ON/STANDBY indica-
tor on the front panel flashing
red?
YES
Are there any incomplete
connections in the connec-
tors connecting between the
various circuit boards?
NO
Is there a short circuit
between the speaker termi-
nals and the ground?
YES
Correct the short circuit
between the speaker and
the ground.
YES
NO
NO
Connect the connectors
properly.
Check for damage in the
power amplifier circuitry parts
and replace any defective
parts.
Is the fuse blown?
NO
Refer to Fuse is blown
YES
Does the power turn on when
the POWER switch is turned
off then back on?
NO
Is a DC 3.3V voltage being
supplied from the POWER
B’d (CP103 pins 3) to the
microprocessor?
NO
Is a DC 3.3V voltage output
when the cord supplying the
power from the SUPPLY B’d
to the microprocessor
(CP103) is unplugged?
NO
Check the parts from IC300
to the primary circuitry and
replace any defective parts.
YES
YES
YES
Check the primary circuitry
parts including the POWER
switch (for poor contacts,
etc.), and replace any defec-
tive parts.
Check the microprocessor
periphery circuitry and
replace any defective parts.
Check the circuitry and parts
from CP103 on the SUPPLY
B’d to the microprocessor for
damage and short-circuits,
and replace any defective
parts.
Fuse is blown
Check for leaks or short cir-
cuits in the primary side
parts, and replace any
defective parts.
Check for short circuits in
the rectifier diodes and cir-
cuitry of the secondary side
rectifying circuits, and
replace any defective parts.
Check for short circuits in
the power stabilizer unit's
regulator output terminal
and the ground, and replace
any defective parts.
After repairing, also replace the fuse.
Summary of Contents for AVR-390
Page 3: ... DHT 390XP dimension AVR 390 AVR 390 ...
Page 4: ... DHT 390XP DSW 390 270 427 395 20 200 530 30 185 150 55 50 400 φ88 ...
Page 5: ... DHT 390XP SC F390 125 130 155 320 ...
Page 6: ... DHT 390XP SC C390 155 125 130 320 SC R390 155 180 130 125 ...
Page 21: ...21 DHT 390XP BLOCK DIAGRAMs AVR 390 AUDIO BLOCK DIAGRAM AVR 390 ...
Page 22: ...22 DHT 390XP AVR 390 GND BLOCK DIAGRAM AVR 390 ...
Page 23: ...23 DHT 390XP AVR 390 VCC BLOCK DIAGRAM AVR 390 ...
Page 24: ...24 DHT 390XP LEVEL DIAGRAM AVR 390 AVR 390 ...
Page 25: ...25 DHT 390XP BLOCK LEVEL DIAGRAM DSW 390 ...
Page 37: ...37 DHT 390XP AVR 390 SC16315 IC700 ...
Page 41: ...41 DHT 390XP AVR 390 PRINTED WIRING BOARDS MAIN P W B UNIT 1 2 COMPONENT SIDE ...
Page 42: ...42 DHT 390XP AVR 390 MAIN P W B UNIT 2 2 FOIL SIDE ...
Page 43: ...43 DHT 390XP AVR 390 AMP P W B UNIT COMPONENT SIDE FOIL SIDE ...
Page 44: ...44 DHT 390XP AVR 390 FRONT P W B UNIT 1 2 COMPONENT SIDE ...
Page 45: ...45 DHT 390XP AVR 390 FRONT P W B UNIT 2 2 FOIL SIDE ...
Page 48: ...48 DHT 390XP AVR 390 MEMO ...
Page 66: ...66 DHT 390XP AVR 390 MEMO ...