Step
Symptom
Probable Cause
Corrective Action
Power indicator lights do
1
a. Defective power cable B160833
a. Replace power cable B160833.
not glow. (Model SG-1145/
b. Defective power jumper cord B160826
URM and MD-1075/URM)
b. Replace power jumper cord B160826
c. Faulty fuse 1A1F1.
c. Replace fuse A1F1.
d . VOLT SET switch 1A1S1 in wrong
d. Set VOLTAGE SET switch to proper
position.
voltage setting.
e. Defective POWER switch 1A1S1.
f. 300 vac not present between pins 2 and
1A2T1
defective.
g. Defective lamp 1DS1.
g. Replace lamp 1DS1.
h. Open resistor 1A3A1R18.
i. Broken wires on Pushbutton Board 1A3.
j. Defective lamp 2DS1
j. Replace 2DS1.
k. SELECTOR switch 2S5 in wrong
k. Set SELECTOR switch 2S5 to proper
position.
position.
n. Faulty fuse 2F1.
l. Replace fuse 2F1.
m. Defective POWER ON switch 2S6.
m. Replace Model MD-1075/URM (see
2
Unit operating but FAN
a. FREQ SET 50/60 -400 Hz switch
a. Set switch 1A1S3 to proper position.*
1B1 not operating
1A1S3 in wrong position.
b. FREQ SET 50/60 -400 Hz switch
1A1S3 defective.
*Serial Numbers 2-60A thru 2-117A