Shizuoka Seiki VAL6 EPX Series, Maintenance Manual

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PAGE 11
VAL6 EPX Trouble Shooting
No. Possible Cause How to check Result Remedy
6
EPX1 black-black (thick):
approx. 3kΩ
EPX5 black-black (thick):
approx. 4kΩ
・Without multimeter
7
EPX1 blue-blue: approx.
400Ω
EPX5 blue-blue: approx.
80Ω
・Without multimeter
(Cord color & Standard value)
(Cord color & Standard value)
Heater cannot start up （heater does not work at all with switching on)
About 5 seconds after turning on operation switch
About 3 seconds after turning on operation switch
Fuse is blowing out Find a cause(s) of blown
fuse and solve it,(refer to
#1-8), then replace with a
new fuse
《How to replace a fuse》
Solenoid valve of fuel
pump is short-circuited
Replace a fuel pump
No lamp is lit
Measure voltage of AC
outlet.
Standard: AC230/120V
(or plug in another power
tool and see if it works) If it shows 0V, power cable
is not receiving electricity.
(or if under 90% of
standard, could be power
shortage) Plug into a working outlet Power source is not
supplied
10
9
Ignition transformer is
short-circuited Disconnect ignition
transformer connector (CN
12) from burner control,
then measure resistance
between terminals
If the fuse is intact, the
ignition coils is short-
circuited Disconnect ignition
transformer connector (CN
12), and then start
operation
Disconnect ignition
transformer cord from
electrode, then measure its
resistance
If it shows 0Ω, the coil of
ignition transformer is
short-circuited
(Cord color & Standard value) black-black (fine): few M
Ω
Replace an ignition
transformer
If it shows 0Ω, the coil of
ignition transformer is
short-circuited
Replace an ignition
transformer
(Cord color & Standard value)
Fuel pump is short-
circuited
If it shows 0Ω, the fuel
pump coil is short-circuited
Disconnect fuel pump
connector (CN 14) from
circuit board, then measure
resistance between
terminals Replace a fuel pump
If fuse is intact, the fuel
pump coil is short-circuited Disconnect fuel pump
connector (CN 14), then
turn on
At the time of changing to low combustion
Disconnect fuel pump
connector (CN 14) from
circuit board, then measure
resistance between
terminals If it shows 0Ω, the fuel
pump coil is short-circuited
8 Replace a fuel pump
EPX5 yellow-yellow:
approx. 700Ω
EPX1 yellow-yellow:
approx. 3.3kΩ
Take fuse out from fuse
box, and then check each
lead with circuit tester
If circuit tester reads ∞Ω,
fuse blows out
Replace an ignition
transformer
(EPX1)
(EPX5)