MagnaTran 7.1 User’s Manual
Troubleshooting
MN-003-1600-00
Checking for FET Short Circuits on the Z Driver Board
Brooks Automation
Revision 2.2
10-37
Checking for FET Short Circuits on the Z Driver Board
TOOLS:
•
Ohmmeter
•
Medium phillips head screwdriver
•
Medium flat head screwdriver
•
M3 hex wrench
PROCEDURE:
1.
Turn off the power to the robot.
2.
Disconnect all power and communication cables from the robot I/O face plate.
3.
Remove the two robot covers via the four captive screws.
4.
Remove the Lower Cover Mount Assembly.
Loosen the lower captive screw of the I/O board. Loosen the three upper cap-
tive screws of the Lower Cover Mount Assembly. See
. Gently allow
the Lower Cover Mount Assembly to drop down.
5.
Locate the Z driver board. Locate the FET designated Q1 and measure its resis-
tance by applying an ohmmeter across pin # 1 and pin #3 of the FET. Record
the resistance in ohms.
6.
Repeat Step #5 for the FETs designated Q1 through Q12 on the Z driver board.
For each FET, record the resistance in ohms.
7.
If any FET ohms out at less than 1k ohms, then the FET has a short circuit and
the Z driver board must be replaced. Refer to Z Driver Board Replacement on
page 55.
8.
If no FETs are short circuited, then continue to Step #9.
9.
Reinstall the base plate using four captive screws.
10.
Reinstall the base plate using four captive screws.
11.
Reinstall the two robot covers using four captive screws.
12.
Reconnect all power and communication cables to the robot I/O face plate.
13.
Turn robot power on.
Procedure is complete.