E7405A-05
SERVICE NOTE
SUPERSEDES: NONE
E4401B, E4402B, E4403B, E4404B, E4405B, E4407B, E4408B, and
E4411B ESA Spectrum Analyzer family. Also E7401A, E7402A,
E7403A, E7404A, and E7405A EMC Pre-Compliance Analyzers.
Intermittent screen "flicker" due to a cold solder joint
ESA Spectrum Analyzer Serial Numbers:
E4401B-07 US39010101 / US40240 610
E4402B-07 US39010101 / US40241 334
E4403B-06 US39010101 / US40240 745
E4404B-06 US39010101 / US40240 716
E4405B-06 US39010101 / US40240 518
E4407B-06 US39010101 / US40241 203
E4408B-06 US39010101 / US40240 473
E4411B-07 US39010101 / US40241 566
EMC Analyzer Serial Numbers:
E7401A-05 US39 110101 / US40240361
E7402A-05 US39 110101 / US40240208
E7403A-05 US39 110101 / US40240139
E7404A-05 US39 110101 / US40240128
E7405A-05 US39 110101 / US40240198
To Be Performed By: Agil ent Service Ce nte r s O nly
Continued
DATE: January 2 001
ADMINISTRATIVE INFORMATION
SERVICE NOTE CLASSIFICATION:
MODIFICATION RECOMMENDED
ACTION
CATEGORY:
LOCATION
CATEGORY:
AVAILABILITY: PRODUCT’S SUPPORT LIFE AGILENT RESPONSIBLE UNTIL: End of GMS period
IMMEDIATELY
ON SPECIFIED FAILURE
AGREEABLE TIME
CUSTOMER INSTALLABLE
ON-SITE
SERVICE CENTER
STANDARDS:
LABOR 1.0 Hours
SERVICE
INVENTORY:
RETURN
SCRAP
SEE TEXT
USED
PARTS:
RETURN
SCRAP
SEE TEXT
AUTHOR: BD ENTITY: 5320 ADDITIONAL INFORMATION:
© 2000 AGILENT TECHNOLOGIES
PRINT ED IN U.S.A.
1 of 3
Page 2 Service Note E7405A-05
Parts Required:
No specific pa r t numbers, just the too ls to ta ke a p a rt the ESA Fr ont Frame assembly . You w il l
also need scis sor s, solder, and a solder ing ir on.
Situation:
Instruments within the above serial range can experience an intermittent screen "flic ke r" due to a
cold solder joint on pin 7 of the transf or mer on the backlight inverter board. The backlight
inverter board a tta c he s to the f ro nt pa ne l interface board (A1A1) on the a na lyz e r. The atta ch ed
figures below in the Sol ution/Action section c a n be refere nc e d on the proc e dur e to use to co rrec t
for this pro b le m.
The backlight inverter board and LCD displa y a re proc ur e d toge ther as an assembly from NEC.
Manufactu ring ha s tr oubleshot screen flic ke r is sue s to poor solder qualit y on pin 7 of the
transformer on the backlight inve rt er boar d. NEC has been notified and an in spe c tion process
implemen te d in ma nufacturing to cur e th is pr oblem.
Solution / Action:
If an ESA or EMC analyze r is returne d a nd the fail description r el ates to a di spla y problem (no
display or intermittent "flicker"), Agilent Service Centers should remove the backlight inverter
board and perfor m the f ollowing procedure:
1) Peel back the plastic shield on the backlight inverter board. See Figure 1.
Figure 1
2) Cut the plasti c wit h a pair of sc issors. See Figure 2.
Continued
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