User Manual – Rev J
CS Series
California Instruments
97
7. Service
7.1 Cleaning
The exterior of the power source may be cleaned with a cloth dampened with a mild detergent
and wrung out. Disconnect mains power to the source before cleaning. Do not spray water or
other cleaning agents directly on the power source.
7.2 General
This section describes the suggested maintenance and troubleshooting procedures. The
troubleshooting procedure is divided into two sections. The first section deals with basic
operation and connection of the equipment. The second section requires opening the unit and
using LED indicators and a simple multimeter to troubleshoot the unit down to the module level.
Only a qualified electronic technician should attempt this level troubleshooting.
7.3 Basic
operation
Table 7-1: Basic Symptoms
PARAGRAPH
PROBLEM
7.3.1
Excessive Output Current
7.3.2
Poor Output Voltage Regulation
7.3.3
Overload Light On
7.3.4 Distorted
Output
7.3.5
Unit Shuts Down After 1-2 Seconds
7.3.6
No Output and no lights on front panel
7.3.7
No output, but front panel controller is active.
7.3.1
Excessive Output Voltage
CAUSE
SOLUTION
External sense not connected(If used)
If external sense mode is selected, make
sure the external sense wires on the rear
panel are connected to the AC power
outputs either at TB1 on the AC source or
at the load.
Output Open
If no load is present and a current is
programmed, the compiance voltage will
exceed the maximum. Short the output or
apply a load < 12 Ohm.
7.3.2
Poor Output Current Regulation
CAUSE
SOLUTION
Unit is overloaded
Remove overload
Input line has fallen below spec. limit.
Check input supply voltage.