Denon DNP-800NE Service Manual page 43

4. Audio is not output due to a problem in the analog circuit (Line Out, Variable Out, H/P Out)
This section details items to check if the digital audio signal is being correctly input to the MAIN PCB DAC IC [IC508].
Check the Clock.
MAIN PCB の DAC IC[IC508 : 7pin], MASTER CLOCK 22.5792MHz or
24.576MHz
YES
Check the Input/output voltage of +1.2V (Power supply IC for DAC)
MAIN PCB
[IC509: 3pin]+5.0V OUT
[IC510: 3pin]+3.3V OUT
Is the input voltage normal?
NO
Check the power supply voltage.
MAIN PCB
[Q549] collector terminal: 12.0V (design standard value) Within ±
1V.
[Q547] collector terminal: -12.0V (design standard value) Within ±
1V.
Is the power supply voltage abnormal?
NO
Check the signal.
MAIN PCB[R839] MUTE
Is the level "Hi"?
(If "Lo" is displayed, output is muted for Line, Variable and H/P.)
YES
NO
Check the Clock.
FPGA[IC501] と PLD[U501]
[R590] : PCM-MCLK/DBCK, [R585] : PLD_DACI_MCK
Replace the MAIN PCB if repair of single parts proves too compli-
cated.
YES
Check each part listed after "YES" in "1.3. Power Supply Voltage
Abnormalities".
YES
Check each part listed after "YES" in "1.3. Power Supply Voltage
Abnormalities".
NO
Check each part listed after "1.4. I2C Communication Line Abnor-
malities".
The MCU is malfunctioning or latched.
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