Test Products International 270 - Manual (Page 35)

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H. Maintenance
1. Battery / Fuse Replacement: The 270 will display a bat-
tery symbol when the internal 9 Volt battery needs
replacement. If DC microamps does not operate correct-
ly the 0.5A / 600V fuse needs to be replaced. The battery
or fuse is replaced as follows:
a. Disconnect and remove all test leads
from live circuits and from the 270.
b. Loosen the screw from the back of the 270 battery /
fuse cover.
c. Remove the battery / fuse compartment cover.
d. Remove old battery or fuse and replace with new
battery or fuse. Observe the correct polarity on the
battery. Only install the correct value fuse
(0.5A/600V). Failure to do so can result in instru-
ment damage.
e. Reassemble the instrument in reverse
order from above.
2. Cleaning your 270:
Use a mild detergent and slightly damp cloth to clean the
surfaces of the 270.
G. Trouble Shooting
Problem Probable Causes
Does not power up • Dead or defective battery
• Broken wire from battery
snap to PCB
Won’t display DC • Open fuse
microamp readings • Open test lead
•
Improperly connected to
circuit under test
All functions except • Very weak battery that will
ohms read high not turn on the low battery
indicator on the LCD
AC Volts do not read • Very weak battery that will
not turn on the low battery
indicator on the LCD
Non-Contact Voltage • The non-contact voltage feature
does not work works best when used to test a
single wire. Make sure the arrow
on the jaw is pointed at the wire.
The meter beeps when • This is a reminder to remove the
set on TEMP test leads and insert the temper-
ature probe. If a probe is insert-
ed, this is an indication the probe
is open.
AC Amps does not read • Make sure the jaw is clamped
around a single wire and the
device connected to the wire is
turned on.