
31
MD-602, 612
13.2
Control box troubleshooting guide
Power PCB
PROBLEM
CHECK
PROBABLE CAUSE
REMEDY
When power SW is ON, LED
(Red) does not illuminate.
Fuse F101, F102 blown?
Short circuit of the load on the
power circuit. Something wrong
with BD101? IPM? ZR? C101–C103,
C111–C113?
Power transformer?
Do not switch ON unless
short circuit is solved.
Fuse F101, F102 OK?
Has the R101 broken down?
Has the pattern blown?
Replace the R101
Replace power PCB
While running the motor OV
or OL error sign appears.
CNR (40W/100ohm
broken down?)
F201 (2A fuse) blown?
40W/100ohm broken down?
iGBT broken down?
Replace 40W/100ohm
Replace fuse, iGBT
OL error?
Pressed the pedal so hard?
Educate how to press the
pedal
Motor does not run
smoothly and an error sign
PT appears, sometimes.
Malfunction by noise
coming from outside.
Malfunction by static
electricity
Is earth surely taken for the power
supply?
Is earth taken for the sewing head
and box? Is earth good for motor
and box?
Take earth
Take earth
Operation of IPM
Something wrong with IPM, PHU-
PHW
Replace the power PCB
While running, PT appears.
Motor does not run
smoothly.
Wirewould resistance of
motor.
Operation of PHU-PHZ
Operation of IPM
Measure wirewould resistance.
2.6ohm between each phases?
Check IPM operation.
Replace motor
Replace power PCB
Motor start up is not good
and motor does not rise in
its rotation. Or, the power
relay becomes OFF.
Is power relay ON?
Heating of the R101
resistor?
Is the contact point of power relay
open? When the power switch is
ON, the contact point is closed. Is
R101 resistor broken?
Replace relay (RY).
The lead wire of relay is
broken.
Replace R101
Treadle unit
Motor does not start when
pressing the pedal
Is VC voltage right at
pedal neutral position?
Is there about 1.5V?
Adjust by VR1
VC voltage when pedal is
pressed fully forward
Is there about 4.5V?
Adjust by VR2
VC voltage does not
change?
Something wrong with #1?
HO?
Replace #1, HO.
Synchronizer
While running an error sign
Lo appears.
Remove synchronizer
cord and check opera-
tion. Machine and motor
run
No encoder signal, needle-up
signal, needle-down signal.
Replace synchronizer
Remove synchronizer
cord and check opera-
tion. No running of
machine and motor
Motor is locked.
Motor
Remove synchronizer
cord and check
It rotate smoothly
Something is wrong with the
encoder signals.
Replace synchronizer
Sewing head is locked.
Adjust sewing head
Others
Control PCB?
Motor does not run
smoothly. Motor rotate by
doing inching.
It does not rotate
smoothly.
Motor is broken down or resis-
tance value abnormal
Motor
Others
Control PCB
Содержание MD-602
Страница 41: ...35 MD 602 612 Stroke VC analog voltage Chart Stroke rpm chart ...
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Страница 60: ...54 MD 602 612 NAME CONTROL PCB ASSY MD602 CODE J80900001 J03766001 ...
Страница 61: ...55 MD 602 612 NAME CONTROL PCB circuit 1 3 NOTE MD602 612 ...
Страница 62: ...56 MD 602 612 NAME CONTROL PCB circuit 2 3 NOTE MD602 612 ...
Страница 63: ...57 MD 602 612 NAME CONTROL PCB circuit 3 3 NOTE MD602 612 ...
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Страница 75: ...69 MD 602 612 NAME TREADLE PCB assy B47A127 CODE J80875001 ...
Страница 76: ...BROTHER INDUSTRIES LTD NAGOYA JAPAN Printed in Japan J90113 001 2001 06 ...