SERVICE MANUAL
Document No
Date of Origin
Date of REV
51-L-DSR004
98-10-21
PAGE REV.
0
PAGE
43 /102
S-00-005(96.03.27)
REV.1
7-14-4.
Check test points TP407,TP408,TP409,TP411
with an oscilloscope.
The test points should be HIGH state when the card is inserted
and
LOW when the card is absent.
7-14-5.
If there is no signal you can suspect
a mechanical
defect or U450 IC
damage and If there is a mechanical
defect replace
the whole main
PCB,if the IC is damaged,
replace
U400.
7-15.
IEE E 1 3 9 4
7-15-1.
Type "T3" command
on the terminal
and check signal line with an
oscilloscope
as follows.
7-15-1-1.
BUF_ADDR
lines 2 to 11 (J6.1 to 10)
7-15-1-2.
BUF_DATA
lines 0 to 7 (U17.2 to 9)
7-15-1-3.
DATA lines D 0 to 7 (U17.11
to 18)
7-15-1-4.
BSKYB_DATA
lines 0 to 7 (J6.53 to 60)
7-15-1-5.
/BSKYB_CS
(U17.19)
and MEMR/W (U17.1)
7-15-1-6.
/BSKYB_OE
(J6.22)
and /BSKYB_R/W
(J6.23)
7-15-1-7.
SDA & SCL lines (J6. 31 to 32)
7-15-1-8.
BSKYB_BYTECLK
(J6.51)
and BSKYB_BYTECLKVAL
(J6.50)
and
BSKYB_PACKETCLK
(J6.49).
7-15-2.
If the above signal lines are O.K. then check the IEEE1394
cable
else if no problem
then Keep checking
the signal path referring
to
the schematic
diagram
and find PCB pattern's
open or short and
defective
component
to replace
else replace
main board.
- 1284 data signal wave form -
200 nS /
2V div