Simpson 2 Series - Resistor Replacement

Maintenance
After replacing either or both rectifiers, test the accuracy
of A.C. voltage indications. If necessary, recalibrate the
circuit by adjusting rheostats R-28 and R-31 as follows:
1. Set the function switch at A.C. and the range switch at
250 V.
2. Connect the red test lead in the + jack and the black
test lead in the COMMON - jack.
3. From a standard voltage source, apply 250 volts A.C.
to the red and black test lead. Adjust rheostat R-31
(which is next to the + meter stud on the printed circuit
board) so the meter reads full scale. Turn power off.
4. Set the range switch to 2.5 V. Apply 29 ое to
the red and black test leads. Adjust rheostat R-28
(which is next to R-31) so the meter reads full scale.
Turn power off.
If no standard voltage supply is available for the above
procedure, return your Model 270 Series 2 to the Simpson
Electric Company or an Authorized Warranty Repair Station
for calibration.
RESISTOR REPLACEMENT
Most of the resistors for the Simpson Model 270 Series 2
are on the rear of the printed circuit. This makes them
easily accessible for trouble-shooting and repair.
When it is necessary to replace any of the resistors in the
circuit, first obtain an exact equivalent resistor. The best
way to do this is to order the resistor or resistors directly
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