Specifications

16
E. MAINTENANCE AND REPAIRS
If the Model 140 is plugged into a standard power outlet through its power cord, the
various display lights should light up at once when the
On-Off
button is pushed. If not,
verify that the power outlet is live. The fuse should be checked. It is in the back of the
instrument and can be found by removing the carrying case. The fuse is 0.75 amperes,
type 3 AG.
DO NOT REPLACE IT WITH A HIGHER RATING.
If the fuse blows
again and there is no apparent cause, it is advisable to return the instrument to the factory
for service.
If the instrument does not respond as expected to input signals, check the plugs for wrong
connections, shorts and opens. The only internal service that is advisable is an inspection
for obvious wiring breaks and replacement of preamp operational amplifiers.
Disassembly is required to obtain access to most of the components.
See the Warranty section for instructions on returning for factory service. Every effort
will be made for a fast turn-around on service problems.