Greenlee 555 Service Manual page 9

Quick diagnostics for electronic problems
1. With bender unplugged, switch six-wire connector on
PGU from "To I/O" to "Test."
2. Plug unit in.
3. Press BEND. Contactor on I/O will activate.
• If not, check for 12 VDC at contactor coil
— If 12 VDC is present, replace contactor
918 6645.6—else replace I/O
• If bender runs, replace PGU.
• On PGU near "test" connector:
Green "Power" LED is ON
Yellow "Direction" LED is OFF
Red "PWM" LED slowly turns dimly on
If not, replace I/O.
4. Press UNLOAD. Contactor on I/O will activate.
• If not, check for 12 VDC at contactor coil
— If 12 VDC is present, replace contactor
918 6645.6—else replace I/O
• On PGU near "test" connector:
Green "Power" LED is ON
Yellow "Direction" LED is ON
Red "PWM" LED slowly turns dimly on
If not, replace I/O.
5. Press BEND. With insulated object, carefully press
black button "S1" on PGU. Bender will run slowly.
If not, replace PGU.
Greenlee / A Textron Company
555 ® Deluxe Electric Bender
9
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070