MALFUNCTION
CORRECTIVE ACTION
PROBABLE CAUSE
16.1.10. No horizontal
1. Digital section.
Check for 2.5 msec pulse on pin
trace.
16, U123. Troubleshoot digital
section. Replace faulty
component.
2. Q81, U81, U83.
Check for 4v ramp on pin 1 of
U83. Replace faulty component.
3. U118, Q124,
Check for 0.8v ramp on pin 6 of
Q125, Q126, Q127,
h orizontal yoke.
horizontal yoke. Should be
between 5-10 ohms. Replace
faulty components.
16.1.11. Chart
Check for 12v recorder power on
U104, Q110, SW1-2.
recorder not
J6 pin 1. Replace faulty
running.
component.
1. Stylus.
16.1.12. Chart recorder
Replace if open.
running but
no trace.
Visual inspection.
2. Make sure stylus is
Clean as required.
clean and
unobstructed.
Replace recorder.
Chart recorder.
but motor not
running.
Check for 540ma current draw.
1. Excessive
16.1.14. Battery not
Find section which is drawing
current draw.
holding charge.
excessive current and
troubleshoot.
Charge battery for
2. Make sure battery
has been fully charged. 16 hours.
Battery should draw constant
3. Q40, CR35, CR34,
200ma from charger. Repair and
RA2 set incorrectly.
calibrate as required.
Load test. Replace if faulty.
4. Battery.
Figure 2-3. Monitor troubleshooting guide (concluded).
MD0362
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