E3631A-08
SERVICE NOTE
SUPERSEDES: NONE
E3631A Triple Output DC Power Supply
Serial Numbers:
STD: KR90917251 - KR90919730
0E3: KR90917351 - KR90920097
0E9: KR90917551 - KR90918891
Firmware upgrade to eliminate a transient spike on the outputs
To Be Performed By: Agilent-qualified Personnel or Qualified customers (Technician level)
Parts Required:
P/N Description Quantity
E3631-60040 ROM r evision 2.1 1
Situation:
With the power supply output enabled, a transient spike occurs on all outputs for
approximately 30 ms under any of the following conditions:
-- The "OUT Put ON" command is sent over the remote interface (GPIB or RS-232)
-- The "*RCL" command is sent over the remote interface
-- The "Recall" key is pressed on the front panel
DATE: July 1999
ADMINISTRATIVE INFORMATION
SERVICE NOTE CLASSIFICATION:
MODIFICATION RECOMMENDED
ACTION
CATEGORY:
LOCATION
CATEGORY:
AVAILABILITY: PRODUCT'S SUPPORT LIFE AGILENT RESPONSIBLE UNTIL: July 2001
IMMEDIATELY
ON SPECIFIED FAILURE
AGREEABLE TIME
CUSTOMER INSTALLABLE
ON-SITE
SERVICE CENTER
STANDARDS:
LABOR 1.0 Hours
SERVICE RETURN
INVENTORY: SCRAP
SEE TEXT
USED RETURN
PARTS: SCRAP
Continued
SEE TEXT
AUTHOR: YCP ENTITY: Y300 ADDITIONAL INFORMATION:
© 1999 AGILENT TECHNOLOGIES
PRINTED IN U.S.A.
1 of 2
Page 2 Service Note E3631A-08
Solution / Action:
Note:
A firmware upgrade is available for units with ROM revision 2.0
code (see serial ranges above). The best way to identify the revision code is to use the "*IDN?" command over the remote interface. This command returns a string with the following format:
"AGILENT TECHNOLOGIES,E3631A,0,2.0-X.X-X.X" (2.0 is revision code)
• The transient spike can be eliminated by replacing the ROM in the unit. Replace the ROM
(U14) on the top PC board assembly (E3631-60002) with the P/N E3631-60040 (revision
2.1). U14 is a large integrated component in a socket. Use the E3631A component
locator drawing (E3631-60002) in the E3631A Service Guide to help locate U14.
•Installation of this part into the E3631A will not affect the calibration.
Verification: (Has this E3631A been modified properly?)
• After replacing the ROM in the unit, the complete self-test is required to check whether the
upgrade is done properly.
• The complete self-test is enabled by pressing the RECALL key (actually any front panel
key except the ERROR key) and the power-line switch simultaneously, then continuing to
press the RECALL key for about 5 seconds. It will be finished in 2 seconds.
• If the complete self-test is successful, "PASS" is displayed on the front panel. If the self-test
fails, "FAIL" is displayed and the ERROR annunciator turns on. After completing the
ROM upgrade, please mark on the unit "UPGRADED to 2.1 CODE"
Recommended Test Equipment: None
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