Do not work on energized equipment alone. The equipment contains 120 Vac. Be
careful not to contact connections for 120 Vac when testing equipment. Always
work with another person nearby who is familiar with hazards of electronic
equipment and is competent in administering first aid. Failure to obey this warning
could result in death or injury.
Do not ground oscilloscope probes.
Set oscilloscope as follows:
Set display mode to add channels A and B
Set one channel for inverted operation.
Set A and B volts division to 0.5 volts.
Set time division to 1 millisecond.
Set for internal sync.
Using dual trace oscilloscope, refer to table 4-3 and connect two 1:1 probes to each twisted pair used.
Verify that FSK signal is present, figure 4-1.
If FSK signal is not present tag and remove data transmission lines and check for FSK signal across data
If FSK signal is present on data transmission lines refer paragraph 4.6.11 and replace surge suppressor CCA,
otherwise refer to TM 5-6350-264-14 series and troubleshoot data transmitter or data transmission lines.
Disconnect and store test equipment.
4.5.3 Converter Multiplexer Test.
This task covers: Test of tamper switches
Multimeter (Appendix B, Section III,
Rear panel door open.
General Safety Instructions
Never work on energized equipment
Push-Pull Switch (Appendix C, Figure 3,