Yamaha NX-A01 - Speaker Sys, Руководство по обслуживанию

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NX-A01
6
NX-A01
■
TROUBLESHOOTING
Check the
cable connections
Reconnect cables
and check again
Check the fault in the
power supply section
(1) +12V and +12VA for system is OK?
(2) +5V for system is OK?
Trouble of microproce-
ssor (IC501) or LEDs
(D506, 509-511) circuit
in MAIN (2) P.C.B.
Good condition
Check the power supply
Does
status indicator light
when "STANDBY/ON" key
is pressed?
Step 1
OK
NG
NG
NO
OK
YES
Step 2
Step 3
• When the status indicator does not light even
when "STANDBY/ON" key is pressed
• When no sound is produced
Check the
cable connections
Reconnect cables
and check again
Connect CB302 in MAIN (1) P.C.B.
to CB502 in MAIN (2) P.C.B. is OK?
• Trouble of audio circuit
(IC301 and peripheral cir-
cuit) in MAIN (1) P.C.B.
• Trouble of amplifier circuit
(IC304 and peripheral cir-
cuit) in MAIN (1) P.C.B.
• Trouble of microprocessor
(IC501) circuit
in MAIN (2) P.C.B.
Good condition
Is the sound produced?
Check the power
when the power is
turned on.
Step 1
OK
NG
NG
NO
OK
YES
Step 2
Step 3
(1) +12V and +12VA for system is OK?
(2) +VA and +5V for system is OK?
Check the fault in the
power supply section
• Trouble of microprocessor (IC501) circuit in
MAIN (2) P.C.B.
Check
microprocessor (IC501)
clock
Microprocessor (IC501)
may work well
X'tal (XL501)
defective
Trouble of RESET circuit
(Q501 and peripheral cir-
cuit)
14 and 15 pins of microprocessor (IC501) is OK?
18 pin of microprocessor (IC501) is OK?
Step 1
OK
NG
NG
OK
Step 2
Check the RESET signal