TESTING AND TROUBLESHOOTING
2. Connect the ECG simulator and adjust the ECG level so that only one pulse is present at U23 Pin 7.
3. Put the oscilloscope on the T1 test point.
4. Put the oscilloscope on the T2 test point.
5. Set the simulator for an ECG input signal of 300 µV. Put the oscilloscope probe at U23 Pin 7.
6. Adj RV12 (T'HLD) until the signal at U23 Pin 7 changes to two pulses.
CRT Display
• Beam Centering
1. Reduce the intensity using the intensity pot at the top of the High Voltage Power Supply board.
2. Remove connector J202 from the Mother Board.
3. Adjust the rings at the rear of the crt to place the beam in the center of the screen.
4. Replace J202 and readjust the intensity.
• Yoke Straightening
1. With no ECG input signal, loosen the screw holding the yoke clamp at the rear of the crt.
2. Rotate the yoke so that the trend line on the display is horizontal.
3. Tighten the yoke clamp screw.
• Horizontal Adjustments
1. Put the oscilloscope on U16 Pin 1. There should be two large ramps and two small ramps.
2. Adjust RV15 so that the peak of the large ramp is 3.4 V.
3. Adjust RV5 so that the trend line (ECG waveform line) is 132 mm long.
4. Adjust RV16 (SS ADJ) so that the ALARMS OFF display area is 33 mm across.
5. Press the TEST button on the monitor's front panel. When pulses appear across the entire screen, press
FREEZE to stop the motion.
6. Adjust RV4 (S) and RV6 (SYM) to make the pulses evenly spread across the screen. The S adjustment
controls the linearity between the middle and ends, and the SYM adjustment controls the linearity from end
to end.
7. Press FREEZE and release TEST so that there are no pulses. Press the MENU button.
8. Adjust RV9 (RSTP) so that the right end of the trend line just touches the left of side the menu box.
9. Repeat the above steps as necessary.
• Vertical Adjustments
44 Model 101R/NR Service Manual
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