Lincoln Electric INVERTEC SVM101-B Service Manual page 45

F-15
J5
7. Measure voltage from Lead #210 (J2/Pin 4) to
Lead # 223A (J4/Pin 11).
a. If voltage is 24v.a.c., thermostats, transfor
mer T1 and switch (S4) are OK. Go on to
Step 8.
b. If voltage is 0v.a.c. test the following com
ponents individually:
Auxiliary Transformer T1
Fan Thermostat
Choke Thermostat
Output Terminal Switch (S4)
TROUBLESHOOTING & REPAIR
OUTPUT PILOT CIRCUIT TEST (cont.)
FIGURE F.3 – CONTROL BOARD TEST POINTS
CONTROL
G2527
V300-I
210
302
J2
J1
275D
8. Measure voltage from lead 302 (J1/Pin 6) to Lead
275D (J1 /Pin1).
a. If voltage is 15v.d.c, Transformer T1 and 15
volt supply are OK. Go to Protection Board
Output test.
b.If voltage is 0v.d.c. check Transformer T1
and then go to Power Board test
F-15
223A
J4
J3