Check Power Supply -2
INPUT PCB
Check the output voltage of [U412] +3.3V
Check the output voltage of [U414] +5V
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
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
Check the analog signal operations after DAC -1
INPUT PCB
U410 : Check the DAC analog output signal
Check the analog signal operations after DAC -2
INPUT PCB
Check the OP Amp output signal
Check the operation of MUTE
INPUT PCB
Check control signal for MUTE.
[N1811 : 2pin]
A_MUTE
[Q405 : Collector] Check the operation of MUTE
Check the connection with DIR -1 (Fs=44.1kHz)
INPUT PCB
Check the [N1821 : 8pin] MCLK. 22.5792MHz
Check the soldering, cable and its connection.
・[N1821, N1820, N1010, N1011, N451, N450]
・[U401, U402]
Check the soldering, cable and its connection.
・[N1811]
Check soldering.
・ Check [U415, U416, U417, U418] and the sur-
rounding C and R
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
Check the soldering, cable and its connection.
・[N1821]
Check the soldering, cable and its connection.
・[N1811, Q404, Q405, Q406, Q407, Q408, Q409]
・[R474, R479, R480, R483, R484]
Check the soldering, cable and its connection.
・[N1821, U407 - 409, U411, U413]
Check soldering.
・The C, R around [U410] is faulty.
Check Power Supply -1
INPUT PCB
・Check the output voltage of [N1821 : 13, 18pin]
+12V_A : 12V
-12V_A : 12V
5. INPUT PCB (Check the INPUT PCB)
NG
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
OK
OK
END
OK
48
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
