TroubleshootingProcedures
WFM90D and WFM91D ServiceManual 6-55
Usethis proc edure when
thereis Vector display jitter.
Thisproblem can be c aused by either the Topor
Bottomboards, andcan only be determined by
replacingthese boards one at atime.
Figure6 -30: Flowchart for vector display jitter
Replacethe Top board.
Usethis proc edure when
thevectors are distortedin
theVector display mode.
Doesthis
remedythe
problem?
Arethe
IFscand QFsc
signals
OK?
Performthe follow ing steps in the Adjustment
Proceduresusing the C ALIBRATION menu:
VectorQuadrature Phase
VectorGain and X5 Gain Phase
Checkthe IF sc and QFsc signals:
(J9is on the Top Board)
J9-42= 400 mVpp filtered s quare wave
J9-43= 300 mVpp filtered s quare wave
No
No
Problemsolved.
Replacethe Bott om board.
Yes
Yes
Figure6 -31: Flowchart for distorted vectors