Test Products International 126 - Manual (Page 25)

25
G. TROUBLE SHOOTING GUIDE
Problem Probable Causes
Does not power up
• Dead or defective battery
• Broken wire from battery
snap to PCB
Won’t display current readings
• Open fuse
• Open test lead
• Improperly connected to
circuit under test
All functions except ohms read high
• Very weak battery that will
not turn on the low battery
indicator on the LCD
ACV do not read
• Very weak battery that will
not turn on the low battery
indicator on the LCD
24
F. MAINTENANCE
1. Battery Replacement: The 126 will display BAT when
the two internal 1.5 Volt “AA” batteries need replace-
ment. Batteries are replaced as follows:
a. Disconnect and remove all test leads from live
circuits and from the 126.
b. Remove 126 from protective boot.
c. Remove the four screws from back of housing.
d. Carefully pull apart front and rear instrument
housing.
e. Remove old batteries and replace with new
batteries.
f. Reassemble instrument in reverse order from
above.
2. Fuse Replacement: Both the A and mAµA input jacks
are fuse protected. If either do not function, replace
fuse as follows:
a. Disconnect and remove all test leads from live
circuits and from the 126.
b. Remove 126 from protective boot.
c. Remove the three screws from back of housing.
d. Carefully pull apart the front and rear instrument
housing.
e. Remove the old fuse(s) and replace it with new
fuse(s).
f. Reassemble the instrument in reverse order
from above.