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SYSTEM TROUBLE CHECK
SANBORN 150 SYSTEM
RECORDER
DUAL CHANNEL DC AMPLIFIER
Save time by first finding
whet~
the fault is, by following these steps in sequenct
1.
IS THERE ACTUALLY A FAULT?
Check the operator's
techni~ue
- try the measurements again - see that the ope!
tor isn't trying something
~he
system isn't built for - check line voltage and
frequency.
2.
IS THE FAULT IN THE GALVANOMETER?
Power
OFF:
Check that there is no roughness when moving writing arm with finge
Power
OFF:
Measure galvanometer coil resistance at galvanometer cap.
Should b.
in vicinity of 3200 ohms.
Power
ON:
Measure voltage across galvanometer coil at the galvanometer cap.
Check that 32 volts change in this voltage gives approximately 10
millimeters of stylus deflection (12.5 divisions on narrow Permapap
3.
IS THE FAULT IN THE DUAL CHANNEL DC AMPLIFIER?
Connect a low test voltage into one channel of the instrument and then into the
other channel.
(Voltage from a 1.5 volt flashlight battery is suggested.)
If
either channel is defective, and the other channel is normal, check tubes in th;
defective channel.
If both channels are defective or dead, check rectifier Y20C
and the fuse F200l.
4.
DID THESE STEPS POINT OUT THE TROUBLE?
By now, you should have made a start at localizing the source of trouble.
If
not, the trouble may be system-wide, or may be impossible to track down by
thi~
method.
\~at
to do:
use the Trouble Shooting Chart and Check Charts.
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