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20
Baker Instrument Company
The Measure of Quality
2.
Connecting AC power from an isolated outlet does not have other equipment with
high current demands.
To check the internal current calibration of the tester will require the I/O board to be on
an extender card. Follow the steps in the Quality Control and Calibration Procedure. If
one or more range readings outside of +/-5% still occur, see the steps below.
1.
Further adjustment may be necessary by altering the values of R33, R35, and R37.
Slight resistive value changes of no more than 10% of the existing value up or down.
2.
Continue monitoring offset value at the I/O board pin 2A to pin 29C for an offset
which drifts away from the nominal measurement of 0.000 volts +/-0.010. If drifting
is detected, replaced U10 and U11.
D
ISPLAY LOCKED UP AFTER SELF
-
TEST
In this fault mode, an operator will see after the on/off switch to the on position that the
tester will illuminate the Baker logo and proceed with it’s internal memory test. All self-
tests will pass. After an attempt to begin testing by depressing the PTT button, there will
be no change in the testers display. Also no change will take place when a softkey is
used. A shorted softkey or a faulty mux integrated circuit on the I/O board is more than
likely the cause.
1.
Check that all softkeys are not stuck, closed, or shorted. This type is normally open
and should have high resistance across the two terminals used.
2.
Check at U15 pin 2 for a high state, if this state is not high replace RPK3. Depress
softkey 1. At this point it should change to a low state.
3.
Check at U15 pin 4 for a high state, if this is not high replace RPK3. Depress softkey
2. At this point it should change to a low state.
4.
Check at U15 pin 6 for a high state, if this is not high replace RPK3. Depress softkey
3. At this point it should change to a low state.
5.
Check at U15 pin 8 for a high state, if this is not high replace RPK3. Depress softkey
4. At this point it should change to a low state.
6.
Change U15.