Denon PMA-1600NE Service Manual page 48

5. INPUT PCB (Check the INPUT PCB)
Check Power Supply -1
INPUT PCB
・Check the output voltage of [N1821 : 13, 18pin]
+12V_A : 12V
-12V_A : 12V
OK
Check Power Supply -2
INPUT PCB
Check the output voltage of [U412] +3.3V
Check the output voltage of [U414] +5V
OK
Check the connection with DIR -1 (Fs=44.1kHz)
INPUT PCB
Check the [N1821 : 8pin] MCLK. 22.5792MHz
OK
Check the connection with DIR -2 (Fs=44.1kHz)
INPUT PCB Check the AUDIO DATA / CLK
Check the signal of [N1821] WCK, BCK, SDATA_L/R
OK
Check the connection with DIR -3 (Fs=44.1kHz)
INPUT PCB Check control signal for DAC.
Check the output signal of [N1821] RST, MS, MC,
MDI
OK
Check the analog signal operations after DAC -1
INPUT PCB
U410 : Check the DAC analog output signal
OK
Check the analog signal operations after DAC -2
INPUT PCB
Check the OP Amp output signal
OK
Check the operation of MUTE
INPUT PCB Check control signal for MUTE.
[N1811 : 2pin] A_MUTE
[Q405 : Collector] Check the operation of MUTE
OK
NG
Check the soldering, cable and its connection.
・[N1821, N1820, N1010, N1011, N451, N450]
・[U401, U402]
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 sup-
ply is connected is not out of order
NG
Check the soldering, cable and its connection.
・[N1821, U407 - 409, U411, U413]
NG
Check the soldering, cable and its connection.
・[N1811]
NG
Check the soldering, cable and its connection.
・[N1821]
NG
Check soldering.
・The C, R around [U410] is faulty.
NG
Check soldering.
・ Check [U415, U416, U417, U418] and the sur-
rounding C and R
NG
Check the soldering, cable and its connection.
・[N1811, Q404, Q405, Q406, Q407, Q408, Q409]
・[R474, R479, R480, R483, R484]
OK
END
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