Motorola T189, Service Manual

Page: 67 / 88

Page 4
lunedµ 20 dicembre 1999
- MOTOROLA CONFIDENTIAL PROPRIETARY -
Dual band Taishan level 3 debug rev 1.0
Does "
GCAP_CLK
13MHz " is
present on TP
823 or C825 ?
Check following voltages before
replacing U800:
2,8V=VDSS on R813
2,8V= VCC_MEMIF on R819
2V=VDD on R823
2V = VCCA on R825
Check for 13 MHz frequency
presence on CR248 , if not ok
check any components surround
it for missing , dry joint or faulty
; check also V1_SW = 5 V
presence on R234 ( it comes
from Q913 ) .
If all is ok probably U200 faulty.
" 2 "
NO
POWER
UP
Does " MAGIC 13
MHz " clock is
present on TP 200
or C817 ?
NO
Is reset voltage
at 2,7 V present
on C820 ?
Is CE0 ,flash ic chip
enable present on TP
824 ?
Is CE2 , ram ic
chip select
present on TP
825 and CE3 on
TP 826 ?
REPLACE
U900
Check for V2 =
2,8 V presence on
C700 , C703 ,if
they are ok replace
U701
Check for U702
power supplies
SR_VCC on C701 ,
R722, if not ok
replace U900 , else
replace U701.
YES
NO
YES
NO
YES
NO
YES
NO
HTC
YES