5b-1
5b Troubleshooting Information
This chapter is intended to be used in conjunction with the information in chapters 5a, 5c,
and with your own troubleshooting style. The troubleshooting reference information
should contain the details needed as you follow your troubleshooting process.
This chapter contains the following troubleshooting reference information:
• Troubleshooting checklist
Use the troubleshooting checklist as a reminder of things to check.
• AC Mains (Line)Fuse Removal
Use these instructions to replace the AC mains fuse.
• Modulation Test Points and Power Supply LEDs Diagram
Use the diagram to check for the proper modulation reading and for a quick visual
check that the power supply voltages are present.
• Power Supply Distribution Diagram
Use the diagram to identify the correct power supply voltage distribution.
• Instrument Block Diagrams
There are three instrument block diagrams: one for the 8648A, one for the 8648B/C, and
one for the 8648D. The block diagrams contain pin and connector designations as well
as input/output specifications.
See Chapter 5a, “Theory of Operation,” for the block diagram description.
To Next Page
Loading...
