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Service
Troubleshooting Procedures
3. Connect the probe's power cord to the power source. Turn the power source on.
7-4. Check the +6 V and 4 V power supply voltages on the exposed portion of the
4. Refer to
Figure
probe end.
• If the voltages are good, suspect an amplifier microcircuit failure. Replace the amplifier
microcircuit and do not perform the following steps.
5. If one of these voltages is bad, follow the procedure in
Covers" on page
7-10, and continue with the following steps.
6. Refer to
Figure
7-4. Disconnect the power supply cable and check the continuity of the three input
lines to the A1 regulator assembly. If one of the wires is broken internally, replace the cable/probe
wand assembly.
7. If the three input lines show continuity, desolder the 4 V and +6 V output wires shown in
Measure the +6 V and 4 V feed throughs on the printed circuit board. If the voltages are good
replace the cable/probe wand assembly. If one of the voltages is bad, troubleshoot the A1 regulator
board. Refer to
Figure 7-5
respectively.
Figure 7-4
Power Supply Check Points
7-6
and
Figure 7-2
for a component location diagram and schematic diagram,
"Removing the Plastic Regulator Housing
Figure
7-4.
Chapter 7
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Table of Contents
Troubleshooting
