Motorola i897 - Page 82

TROUBLESHOOTING: RX Analysis Test
RX Analysis Test (Continued)
Does
TP_RXFS
have a square
waveform at
~ 1.875Vp-p
+20%?
Check DC and ZEUS section,
then if no fault found replace the
Zeus IC (U804).
Is voltage on
TP_RX_AC
Q ~ 1.875V
+10%?
Does
BBP_RXCLK
have a square waveform at
3.36MHz at ~ 1.875Vp-p
+20%?
Yes
No
Abbreviations:
US = Unsoldered components or connections
MP = Missing parts
DFP = Defective parts
Yes
No
Yes
No
Does
TP_SRDB
have a square
waveform at
~ 1.875Vpp
+20%?
Yes
Check R601, R628, R659,
C601, C602, C631, C660 and
C668 for S, US, MP, DFP.
Check DC section, then if no
fault found
replace the Roadrunner IC
(U701).
Check R601, R628, R659, C601,
C602, C631, C660 and C668 for
S, US, MP, DFP.
Check DC section, then if no
fault found
replace the Roadrunner IC
(U701).
Check C703, C781, C776,
C777 and C779 for S, US, MP,
DFP.
Check DC section, then if no
fault found
replace the Roadrunner IC
(U700).
Problem can not be
determined without further
extensive analysis.
No
B C
With Hi impedance RF Probe (Hi-
Z) check the RF level on either pad
of C215.
Is
RF level
-53 dBm
+10%?
Check FGU (VCO)
section for proper
operation.
Check R212, C212,
C213, C214 and C218
for S, US, MP, DFP.
Check DC section,
then if no fault found
replace the Janus
Module (U500).
Yes
No
Check C781, R660, C216, C217,
C219, C222, C224, C228, C229,
C230, C231, C303, C501, C676,
C677, E601 for S, US, MP, DFP.
Check DC section, then if no fault
found replace Sledgehammer IC
(U600).
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