(2) Adjust the voltage at the input terminals to the printed circuit board (pcb) to
be 12.5v with the unit turned on, but the chart recorder turned off.
(3) Apply a signal of 1mv, 60bpm from the ECG simulator to the patient cable
input. The current taken from the supply should be 580ma or less, with small fluctuations
in accordance with the heart rate display. When the chart recorder is turned on, this
current should jump up 500ma.
f. Calibrate the Battery Meter. Refer to Appendix E, Monitor Board Power
Supply Schematic, section D-24.
(1) The line or pointer of the moving coil meter should be at the intersection of
the green and red areas with a supply voltage of 11.0v using the same general set up as
This adjustment is performed by turning RA13 (four-turn control).
g. Adjust the Horizontal Amplitude. Refer to Appendixes E, Monitor Board
Power Supply Schematic, section C-24.
(1) Using a 60bpm heart rate, adjust the distance between QRS complexes to
25mm by adjusting R241 (one-turn control) in the center portion of the screen.
(2) If the trace is not covering the full width of the screen, rotate one or both
magnets located on the back of the deflection yoke assembly. If some non-linearity seems
to be present, you must corrected this by using the horizontal linearity controls R216 and
R217 located on the main PCB.
h. Calibrate the Vertical Amplitude. Refer to Appendix E, Monitor Board Power
Supply Schematic, section C-22.
(1) Use the same general set up as for horizontal deflection amplitude.
Operate the unit with an ECG simulator 1mv output.
(2) Set the manual amplitude control to the center position and adjust the
actual signal amplitude on the CRT to a high of 20mm by turning control R231 (one-turn
The horizontal and vertical deflection controls affect only the display on the
CRT. Their settings do not affect the chart recorder or any of the auxiliary