Dac Pcb - Denon PMA-2500NE Service Manual

5. DAC PCB

Check DAC PCB
Check Power Supply-1
DAC PCB
・Check the output voltage of [N402 14, 19pin]
Check Power Supply-2
DAC PCB
Check the output voltage of [U412]
Check the output voltage of [U414]
Check the connection with DIR -1 (Fs=44.1kHz)
DAC PCB
Check the [N402 8pin] MCLK.
Check the connection with DIR -2 (Fs=44.1kHz)
DAC PCB Check the AUDIO DATA/CLK
Check the [N2911] signal
Check the connection with DIR -3 (Fs=44.1kHz)
DAC PCB Check control signal for DAC.
Check the output signal of [N402]
Check the analog signal operations after DAC -1
DAC PCB
U401 : Check the DAC analog output signal
Check the analog signal operations after DAC -2
DAC PCB
Check the OP Amp output signal
Check the operation of MUTE
DAC PCB Check control signal for MUTE.
[N401 (2)pin]
[Q405 Collector]
Check the output terminals
DAC PCB
Check the [N403] connector
+12V_NSW : 12V
-12V_A : 12V
OK
+3.3V
+5V
OK
22.5792MHz
OK
WCK, BCK, SDATA_L /_R
OK
RST, MS, MC, MDI
OK
OK
OK
A_MUTE
Check the operation of the MUTE.
OK
OK
END
NG
Check the soldering, cable and its connection.
・[N402 / N203 / N201 / N8602]
・[U8601 / U8602]
NG
Check soldering.
・ Use a tool such as a circuit tester to check that there is
no short circuit for the power supply and GND, etc.
・Check that the regulator is working properly
・ Check that the element to which the power supply is
connected is not out of order
NG
Check the soldering, cable and its connection.
・[N402, U407 - 409, U411, U413]
NG
Check the soldering, cable and its connection.
・[N401]
NG
Check the soldering, cable and its connection.
・[N402]
NG
Check soldering.
・The C, R around [U410] is faulty.
NG
Check soldering.
・ Check [U415, U416, U417, U418] and the surrounding
C and R
NG
Check the soldering, cable and its connection.
・[N401, Q404, Q405, Q406, Q407, Q408, Q409]
・[R474, R479, R480, R483, R484]
NG
Check the soldering and its connection.
・[N403]
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