To Troubleshoot Power-Up Failures - Agilent Technologies 35670A Service Manual

Agilent 35670A

To troubleshoot power-up failures

Use this test when the screen is defective, when the analyzer does not respond
correctly to the keyboard, or when it takes more than 3 minutes for the keyboard to
become active. Any of the following conditions may cause a power-up failure:
A defective CPU or Memory assembly.
•
A defective assembly connected to the CPU assembly causing a bus failure.
•
A defective cable between the CPU assembly and another assembly.
•
A defective control line.
•
Step 1. Compare the power-up failure messages to the following table.
G
• Set the power switch to on (
• If the screen is blank or no power-up failure messages are displayed, go to
Step 2.
• Determine the probable faulty assembly or next test by comparing the
power-up test result to the following table.
If the power-up failure messages match more than one entry in the table, use the
entry closest to the beginning of the table.
Failing Power-up Message
LEDs
MC68030 Processor
MC68882 Coprocessor
Bootrom
Display
Main RAM
Program ROM
DSP
Fast bus
MFP
GPIB keypress detected, booting to GPIB Monitor
Front Panel failure information:
keyboard IIC chip fails:
IIC: No Device Acknowledge
key stuck: 32
Front Panel failure information:
key stuck: number
where number is 13, 14, 16, 20, 21, 24, 33,
35, 36, 37, 38, 40, 43, 52, 53, or 54
Front Panel failure information:
key stuck: number
all other numbers not listed above
).
l
Probable Faulty Assembly or Next Test
A7 CPU
CPU, memory, DSP, and buses failures,
page 4-18
A7 CPU
IIC Bus failures, page 4-25
A7 CPU
A14 Secondary Keypad
A11 Keyboard Controller
A14 Secondary Keypad
A13 or A15 Primary Keypad
Troubleshooting the Analyzer
To troubleshoot power-up failures
4-15