HP 8753E - YO Coil Drive Check with Oscilloscope

YO Coil Drive Check with Oscilloscope
Note
Use the large extender board for easy access to the voltage
points. The extender board is included with the HP 8753
lb01
Kit. See Chapter 13, “Replaceable ParW, for part numbers and
ordering information.
1. Connect oscilloscope probes to AllPl-1 and AllPl-2. The YO coil drive
signal is actually two signals whose voltage difference drives the coil.
3. Monitor the two YO coil drive lines In source tune mode the voltage
difference should vary from approximately 3.5 to 5.0 volts as shown in
Figure 7-7.
q If the voltages are not correct, replace the faulty All assembly.
q If the output signa.ls from the All assembly are correct, replace the faulty
A3 source assembly.
q If neither the A11, nor the A3 assembly is faulty, continue with the next
check.
-300.000 Ins -150.000 IS 0.00000 s
I
z::: -
1. GCG volte/div
Offmet - 7.000 volts
1.000 volts/div Offset - 7.000 volts
11-e - 30.0 mddiv Oeloy
- 0. OOMO s
Figure 7-7.
sg606s
YO- and YO + Coil Drive Voltage Differences with SOURCE PIA OFF
7-12 Source Troubleshooting