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382260 V1.0 6/07 7
Trouble Shooting
PROBLEM INDICATIONS POSSIBLE CAUSES
SUGGESTED
SOLUTIONS
Power supply not
working
Panel display, LED
Indicators not on
A. AC power input not
connected
B. AC input fuse
blown
A. Check AC power
connection,
B. Contact factory
No DC output power Voltage meter zero
indication.
ALM (13) Alarm led on
CC (12) led on
A. Output on off button
not on .
B. UVL (10 )
protection triggered
C. OTP protection
triggered
D. Output short circuit
A.
Check output LED
(9) is on or not,
push (9) to on
.
B. Check UVL set
voltage by pushing
(6), re-set UVL to
applicable limit.
C. Check vent holes at
top and bottom is
clear, ambient
temperature too
high
D. Check and undo
short circuit of
output connection.
Voltage meter reading
grossly inaccurate
Actual output voltage is
grossly different from
the meter read out
A. Volt meter shows
not the output
voltage.
B. Possible
misalignment in
voltmeter
calibration
A. Check the LED
indicator of UVL on
the top right hand
side of the Volt
meter, if it lights up
then the volt
meter only shows
the set UVL value.
Push (6) to go
back to output
voltage.
B. Contact factory
Ampere meter reading
grossly inaccurate
In CV mode , the actual
current measured is
grossly different from
the Amp meter reading
Possible misalignment
in calibration .
Contact factory
The activated
(auto- cross over )
current limiting value
is different from the
preset cc value
All indicators and
display are normal ,
only CC mode has the
problem
For stand alone unit,
Master & Slave
Switch (17) in wrong
position (Slave). Wrong
setting or connection in
Master & Slave or
set up procedure.
Check the Master &
Slave switch (17)
correct position. Use
stand alone mode to
check power supply
separately without any
connection to slave
units. Follow the
procedure carefully and
make sure there is only
one Master unit.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also provides
NIST certification for most products. Call the Customer Service Department for information
on calibration services available for this product. Extech recommends that annual
calibrations be performed to verify meter performance and accuracy.