Lincoln Electric SVM188-A Service Manual page 64

F-24
MAIN TRANSFORMER VOLTAGE TEST (continued)
LED5
LED6
PROCEDURE
WARNING
ELECTRIC SHOCK
• Do not touch electrically hot parts.
13. Remove the input power to the DC-600. Remove
the screws from the control box cover and careful-
ly lower the cover and locate plug J5 on the Firing
Board. See Figure F.11.
14. Turn on the DC-600 and check for approximately
32 VAC at the following pins of plug J5. These are
the phase angle winding voltages.
F.11.
TROUBLESHOOTING AND REPAIR
FIGURE F.11 – FIRING BOARD
LED8 LED9
LED3
LED4
G3742-[ ]
can kill.
See Figure
DC-600
LED7
LED1
LED10
LED2
FIRING BOARD
Plug J5 pin-15 (lead #203) to pin-16 (lead #204)
Plug J5 pin-8 (lead #205) to pin-7 (lead #206)
Plug J5 pin-6 (lead #207) to pin-5 (lead #208)
18. If the correct primary voltages are applied to the
main transformer and any of the secondary volt-
ages are missing or not correct, the transformer
may be faulty.
NOTE: Always check the wiring between the trans-
former windings and the test points before replac-
ing the transformer.
F-24
J5
(205) 8
16 (204)
(206) 7
15 (203)
(207) 6
14
(208) 5
13 (231)
4
12 (215)
3
11
2
10
1
9
J6
J7
J8
J4