TroubleshootingProcedures
6-48 WFM90D and WFM91D Service Manual
CheckJ1
onthe SDI Int erface board: Are
MOSI(J1-5) and SCLK (J 1-6)
present?
Check
SDIInterf ace board: J1-11goes
fromapproximat ely 5 V with DIGITAL
selectedto approxim ately 0 V with
ANALOGselected?
Check
theSDI Int erface board: J1-15
isanalog video signal
(reconstructed from digital)
present?
Usethis proc edure if the instrument
workswit h analog input signal but not
withserial digital input signal.
Check
CARRIERDETECT LINE, SDI
Interfaceboard: J1-12=
approximately3. 4 VDC with no
signal,and approximat ely 4.5 VDC
withserial digital input signal?
INthe CONF IG menu, set INPUT CTL
toAUTO or DIGITAL.
Replacethe
inputboard.
Checkcable f rom Input board,
Topboard, and Bottom board
forMOSI and SCLK s ignals.
Connectserial digit al input signal to the input. In the
CONFIGm enu, select INPUT CTL. Cycle through the
threeselections : AUTO, DIGITAL, and ANALOG.
No
Yes
ReplaceSDI
Interfaceboard.
Yes
Yes
Yes
No
No
No
Replacethe
inputboard.
ReplaceSDI
Interfaceboard.
Figure6 -23: Flowchart for problems processing serial digital input signals