89410A-08
SUPERSEDES: None
DATE: January 1996
89410A Vector Signal Analyzer
Serial Numbers: 0000A00000 / 3416A01416
Intermittent calibration failures
To Be Performed By: Agilent-Qualified Personnel
Parts Required:
Part No. Qty. Description
89410-69520 see text Exchange ADC Assembly
Situation:
Some intermittent calibration failures have been traced to a gate array die change on the
A20 ADC assembly. The calibration failures may only occur once per week or less, but
they will be recorded in the fault log. The portions of calibration that fail due to this problem are channel x pads, channel x flatness, and channel x dc gain, where x is the input
channel failing. A20 ADC assemblies with date code 3550 or greater have been modified
to eliminate this problem.
1 of 2
AUTHOR: DWH
ENTITY: A100
© 1996 AGILENT TECHNOLOGIES
PRINTED IN U.S.A.
SERVICE NOTE
ADMINISTRATIVE INFORMATION
MODIFICATION RECOMMENDED
SERVICE NOTE CLASSIFICATION:
ACTION
CATEGORY:
LOCATION
CATEGORY:
CUSTOMER INSTALLABLE
ON-SITE
SERVICE CENTER
AGILENT RESPONSIBLE UNTIL: January 1998
ADDITIONAL INFORMATION: PCO A!-9512035
IMMEDIATELY
ON SPECIFIED FAILURE
AGREEABLE TIME
AVAILABILITY:
PRODUCT’S SUPPORT LIFE
RETURN
SCRAP
SEE TEXT
SERVICE
INVENTORY:
RETURN
SCRAP
SEE TEXT
USED
PARTS:
STANDARDS:
Labor 1.0 Hour
Continued
Page 2 Service Note 89410A-08
Solution/Action:
Step 1. Press the following keys to view the fault log.
[System Utility]
[more-]
[diagnostics-]
[service functions]
[1125] (if required)
[enter] (if required)
[fault log-]
Step 2. If the fault log shows multiple calibration failures with the following messages,
and the failure is not repeatable, then the A20 for the failing channel(s) should be
replaced.
Channel x pads
Channel x flatness
Channel x dc gain
where x = the failing input channel
Step 3. Replace the A20 assembly using the procedure in chapter 3 of the 89410A service guide.
Step 4. Clear the fault log by pressing the following keys:
[System Utility]
[more-]
[diagnostics-]
[service functions]
[1125] (if required)
[enter] (if required)
[fault log-]
[clear fault log]
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