Smiths RVI.1000 SERIES, Инструкция по эксплуатации

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SYMPTOMS, FAULTS AND TREATMENT
It is possible by using these instructions to eliminate any
single defective component in the Tachometer. To assist this a
schematic circuit diagram showing points letter
A - H
is shown.
In addition to the special recalibrating equipment a good
quality voltmeter suitable for reading voltage and resistance
values will be necessary to locate most faults. When taking
voltage checks, always take them with respect to the positive
line.
SYMPTOM FAULTS TREATMENT
Incorrect
Reading
Poor Connections
Incorrect Calibration
Out of Poise
Pointer Sticking
Movement Assembly
C2 Faulty
Check all connections for dry joints
and also the pulse lead and iron
core assembly.
Check the calibration of the
Tachometer as described under
calibration instructions on Page
S.7.
Check poising as described on Page
S.7.
Check positioning of pointer on
movement spindle and refit if
necessary. Poise and recalibrate.
Remove suspect movement and replace
with a good one and check the
Tachometer. Poise and recalibrate.
If C2 has a low capacitance replace
component.
No Reading Poor Connections
Pointer Loose
Component defective
R9,
C3, DZ,
R5, R8
9
R7,
R6, TR1, TR2,
R3, R2, Cl,
C2.
Check all connections and in
particular the pulse lead and iron
core assembly.
Refit the pointer. Poise and
recalibrate the movement.
Switch on the supply to the
Tachometer but do not feed in a
pulse. Check the voltage across DZ
and if it is between 4.7V
and
5.1V
the meter circuit is
satisfactory. If voltage is more than
5.1V replace DZ and check the
Tachometer again. If the voltage is
less than 4.7V check the rest of the
components.
S.12