Troubleshooting Guide; Introduction; Power-Up Failure; Table 3-1 Power-Up Failure Troubleshooting - Keysight 8990B Service Manual

3

Troubleshooting Guide

Introduction

This chapter contains a general troubleshooting guide to detect failures for the
8990B peak power analyzer. The service strategy for this peak power analyzer is
by replacement of the defective assembly boards.

Power-Up Failure

Table 3-1 Power-up failure troubleshooting
Basic check
Basic external check
Basic internal check
64
Debug tips
– Ensure that the Power On/Off switch
lights up
– Ensure that the main power source is
live
– Check the main cable for any obvious
damage
– Replace the main power cable
– Ensure that the green LED DS 14 on the
DAP board light up when the power
button is pressed
– Ensure that the green LED DS4 on the
main board light up when the power
button is pressed
– Ensure that the green LED DS2/DS3 on
the main board flashes on and off
during normal operation
Possible faul ts
– Power supply module (high
probability)
– Mainboard (low probability)
– Power supply module (high
probability)
– Main board (low probability)
– DAP board (low probability)
Keysight 8990B Service Guide