Machine power on
Check whether
voltage of two sides of
power wire is
90~250V
Replace power wire and
trouble is removed
Check whether
two sides of power
board CE5
is 300V
Check
whether insurance
tube is normal
Replace insurance tube
Check rectifying diode
D501-D504
Check
whether red
indication light of
panel is
on
Press
POWER button to
power on and check
whether it is on
A1
Check
whether power
board outputs voltage
normally
Check power supply
circuit of decode board
Check
whether panel power
supply is
normal
Check whether working
voltage of indication light
is normal, whether indication
light is damaged
Check whether power
board U501, U502 and
U503 are normal working
Check
whether power
supply of FLASH
is normal
Check
whether clock is normal
Check
whether working
voltage of MT1389
is normal
Replace MT1389 chip
A4
A3
A2
Y
N
N
N
Y
Y
N
N
Y
Y
N
Y
Y
N
N
N
Y
Y
Y
Chapter Five Troubleshooting Flow Chart
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