PROBABLE CAUSE
CORRECTIVE ACTION
MALFUNCTION
16.1.3. Trace
Focus pot R80 out of
Adjust R80 till
out of focus.
adjustment.
sharply focused.
16.1.4. Trace
1. Patient cable.
Check with good cable.
present but no
Replace faulty cable.
QRS, rate meter
not counting;
2. Faulty
Check for 1.25v QRS
gain control
on pin 8 of U101. If
fully clockwise.
not present check FM
3. U112, U101.
Check for 1.25v QRS
on pin 8 of U101. If
not present replace
faulty component.
16.1.5. Trace
Check for 0.8v QRS signal on pin
present but no
6 of U120 and 0.8v video on pin
QRS, rate meter
7 of U80. If video output not
counting.
present, troubleshoot non fade
2. Q122, Q123,
Check U118 pins 2,3.
vertical yoke, Q121,
Signals should be
U118.
identical. Check dc
Should be 44 ohms.
Replace faulty component.
16.1.6. Trace
1. Check for proper
Remove electrodes
noisy with
electrode application
check for dry gel.
or placement. Make
wandering
Replace dried up or
sure electrodes are
baseline.
out of date electrodes.
not dried up or past
expiration date.
Figure 2-3. Monitor troubleshooting guide (continued).
MD0362
2-42