Philips PageWriter TC70 - Running the Lead Wires Open Test; Running the Lead Wires Short Test

Running the Lead Wires Open Test Troubleshooting
PageWriter TC 70 Cardiograph Service Manual 3-35
Running the Lead Wires Open Test
Use the following procedure to test for open lead wires.
To test for open lead wires
1
Connect all of the lead wires to a metallic conductive surface, a shorting bar, or an ECG
simulator.
2 Touch the Map button on the cardiograph’s toolbar to open the lead map.
3 Ensure that no leads are being reported as leads off (red x mark ).
4 If any of the precordial leads report as leads off, with all limb leads connected, replace the
precordial lead(s).
5 If all leads report as leads off, replace the RL/N lead with a lead that is known to function
normally. If the new lead connected to the RL/N connector functions normally, replace the
defective RL lead. Once the RL/N lead is operable, proceed to replace any other leads that
display as leads off.
Running the Lead Wires Short Test
Use the following procedure to test for lead wire shorts.
To test limb leads
1
Disconnect all lead wires from the PIM.
2 Disconnect all lead wires from the patient or simulator.
3 Connect one limb lead wire to the PIM’s RA connector. Make sure that the post of the lead
wire is not in contact with any other lead wire posts or any other conductive surface.
4 Touch the Map button on the cardiograph’s toolbar to open the lead map.
5 Check that the RL lead shows a leads off (red x mark ).
6 If the RA and RL leads show a connection, with all other leads off, then the lead wire in
the RA connector has a short.
7 Repeat steps 3 through 5, connecting each limb lead (RL, RA, LL, LA) to the PIM’s RA
connector.
To test chest leads
1
Connect all the lead wire to the PIM.
2 Connect the limb leads to a metallic conductive surface, shorting bar or an ECG simulator.
Do not connect the chest leads.
3 Touch the Map button on the cardiograph’s toolbar to open the lead map.
4 Check that all limb leads show a connection.
5 Verify that all chest leads show leads off (a red x mark ).
6 If any chest leads show a connection, replace that lead wire.