In this section:
Stuck buttons ........................................................................... 9-1
Line power................................................................................ 9-1
Repeated trips .......................................................................... 9-1
Incorrect rear-panel output voltage .......................................... 9-2
Front-panel test ........................................................................ 9-2
Power-on reset ......................................................................... 9-2
No high voltage ........................................................................ 9-2
Service ..................................................................................... 9-3
Stuck buttons
If the center display is filled with a number (such as 4444) or one particular message (such as Err2),
and the front panel buttons are unresponsive, check to see if a button is stuck. If so, gently tap the
stuck button back to the center of its hole to free it.
Line power
Always make certain that the power entry module is set for the correct line voltage and that the
correct fuse is installed. The selected line voltage can be seen through the window on the power
entry module. Verify that the line cord is plugged completely into the power entry module and that the
front panel power switch is on.
Repeated trips
Voltage Trips
— This problem may occur if the load changes too rapidly, causing the voltage to
overshoot. Try raising the voltage limit.
Current Trips
— Disconnect the load, and note if the unit still trips. If the unit operates with no load,
the load may be causing the problem. If the unit still trips with the load disconnected, the unit may be
damaged. Contact the factory for further information.
Primary Trip
(PTRP) — If repeated PTRPs occur, the power supply may be damaged. Contact the
factory for further information.
A PTRP message will occur if the line current exceeds 5.3 A. This feature is included to protect the
instrument. The PTRP level is not user programmable and may be cleared in the same manner as
the voltage and current trips.
Section 9
Troubleshooting
