HP 8648 A/B/C/D - Changpuak.ch

Troubleshooting Information
Introduction
5b
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 HP 8648A,
one for the HP 8648B/C, and one for the HP 8648’1). 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.
Troubleshooting Information 5b-1