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YES
NO
CHECK Ql88
YES
CHECK Q206
CHECK Ql56,
Ql58, Ql59,
AND Ql62
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LEGEND
LOGIC DECISION STEP:
A performance check
that results in a logic decision to determine the
next step in the troubleshooting process.
ACTION STEP:
A step involving setting of
con-
trols;
component or part checks;
voltage,
waveform, or resistance checks;
repair;
and
recalibration.
To use this chart, begin at START and perform any instrument perfor-
mance checks necessary to answer the question in the Logic Decision
Step on the top horizontal flow line of the
chart.
Whenever a negative
logic decision {No) is reached, perform each Logic Decision Step and
Action Step in the sub-flow lines of the chart until the original logic
decision (No) is corrected to a positive decision {Yes)
.
Then continue
through the chart until the END is reached, at which time the instrument
Performance Check should be performed and the instrument calibrated as
required.
Fig. 9-24 (cont). Troubleshooting chart.
SET RMS
PUSH BUTTON
IN
SET
I
NPUT
COUPLING
TOGND
CHECK Q204,
U250,
AND
Q256
SET INPUT
COUPLING
TO AC OR DC
CHECK Ql95
MAKE
RESISTANCE
AND CURRENT
MEASUREMENTS
CHECK AND
ADJUST DMM
REFERENCE
CHECK
RESISTANCE
SCALING
RESISTORS
CHECK Fl61
CHECK
CURRENT
SHUNT
RESISTORS
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Troubleshooting
