Martel Electronics 135 - Manual (Page 65)

Service Information
130/135 61
Fuse Type/
Location
Fuse
No.
Function Test
Input/
Output
Model 130
Model 135
Top PCB
130/135
Model 130
Model 135
F2
F3
mA Output Short the milliamps output
terminals and attempt to output
10mA. If the output reads Open,
the fuse may be blown. Measure
from the mA positive (red) terminal
to the volts out negative (black)
terminal. If you measure 13-15 V
the fuse is OK.
F3
F4
V/mV
Output
If mA and frequency output
function normally, but volts or
millivolts do not function, the fuse
may be blown.
Main Power
Bottom
PCB
130/135 F1 Primary
Power
This fuse should not blow unless an
internal malfunction occurs or
unless the user inadvertently shorts
the main DC power line while the
case is open. The symptom would
be that the unit is completely dead.
F2 Charger This fuse protects the batteries in
case
the wrong charger is
connected to the unit. The
symptom would be that the unit
would not recharge from the
charger. If this fuse is found blown,
ensure that you are using the
charger supplied with the calibrator.