6.3.10
Foot Switch
Chapter 6 - Detailed Diagnostics
continued
Replacement:
1.
Remove the line cord and un-screw the two phillips head screws which hold the front panel "L" brackets to
the base plate. Loosen the two phillips head screws that hold the front panel to the generator and remove
the front panel by lifting it up and away from the generator.
2.
Remove the phillips head screw securing the display to the back panel. Remove all cabling leading to the
display and replace it with the appropriate part listed in Appendix C.
NOTE: It is important to save and re-install the nylon bushings that insulate the display from the
front panel.
The foot switch is connected externally to the back panel of the generator. For a functional description see
section 2.2.
The foot switch contains E.S.D. protection resistors in the cable connector and must therefore be tested together as a
unit, as follows:
1.
Remove the foot switch connector from the back panel of the generator and orient it so that the pins
are visible and the red keying dot is at 12:00.
2.
Using an insulated clip, attach the DVM to each internal pin and look for resistances (+/- 10%) to the
connector shell under the following conditions:
Resistance to Shell
PIN
No pedals
Var pedal
Full pedal
location
pressed
pressed
pressed
2:00
< 1 ohm
< 1 ohm
< 1 ohm
5:00
200K
100K
200K
8:00
200K
100K
100K
11:00
200K
200K
100K
If the above values are not correct, replace the foot switch assembly.
If the above resistances are correct and the foot switch does not perform properly, check the wiring leading from the
foot switch connector on the back panel to the keyboard PCB. If the wiring appears intact, there is a faulty keyboard
PCB. See section 6.3.7 to replace the keyboard.
26
6.3.9
Liquid Crystal
Display
continued
