Section TOC
Master TOC
F-14 TROUBLESHOOTING AND REPAIRF-14
POTENTIOMETER TEST (cont.)
FIGURE F.4
Return to
Return to Section TOC
Return to Section TOC
Return to Section TOC
Return to
Return to Master TOC
Return to Master TOC
Return to Master TOC
535
Control
Board
641
642
TEST PROCEDURE
WIRE SPEED CONTROL POTENTIOMETER
1. Disconnect leads 641, 642 and 535 from the Control Board. (See Figure F.4)
a. Check resistance between lead 535 and lead 641 for a reading of 10kΩ
A low reading or an ʻopenʼ reading indicates a defective potentiometer.
b. Connect the ohmmeter to leads 641 and 642, and rotate the control slowly from min to max speed setting.
The meter should vary smoothly from 10kΩ to 0 Ω.
c. Repeat test ʻbʼ with meter connected to leads 642 and 535.
Any irregularity or ʻskippingʼ in the meter read- ing indicates a defective potentiometer.
d. Check all three leads to the potentiometer case. Reading must be >500kΩ.
Codes Below 10892
77
|
| F |
75 | E | A |
76 | D | B |
| C | |
|
|
Codes 10892 & Above
76 |
|
75 | G |
F | A |
| H |
77
E | B |
| |
D | C |
|
VOLTAGE CONTROL POTENTIOMETER For codes above 10892 (8 pin connector)
1. Disconnect the Control Cable from the back of the feeder.
NOTE: See Figure F.4 for Pin locations
a. Check resistance from Pin F(75) to Pin H (77) of the box connector for a reading of 10kΩ +/- 10%.
A low reading or an ʻopenʼ reading indicates a defective.
b. Connect the meter from Pin F(75) to Pin G(76) and rotate the control slowly from min to max voltage setting.
The meter should vary smoothly from 0 Ω to 10kΩs.
c. Repeat test ʻbʼ with meter connected to Pins G and H.
Any irregularity or ʻskippingʼ in the meter read- ing indicates a defective potentiometer.
d. Check all three leads to the potentiometer case. Reading must be >500kΩ.
NOTE: Codes below 10892 have a 6 pin connector. Test points will be pins E(75), D(76) and F(77)
