3745 FRU Exchange Procedure
A
B
C
D
E
F
G
H
J
K
W
Y
Z
LI
C
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C
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C
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C
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C
DMUX
Figure 4-48. DMUX Location
Cable 2
Cable 1
W
X
Y
Z
Figure 4-49. DMUX
Installation Procedure
1. Install the new DMUX cassette.
2. Fasten the thumb screw holding the DMUX
cassette to the board. Finger strengh is
enough. Do not use tools.
3. Replace the DMUX cables in their proper
positions.
4. Re-install the DMUX cover with the two
screws. Refer to Figure 4-47 on page 4-39.
5. Close the rear door.
6. Referring to Chapter 3, “How to Run 3745
Diagnostics” on page 3-1, run the same diag-
nostic that you ran before you exchanged the
FRU. Go to “Action to Take After a Diag-
nostic Run or an FRU Exchange” on
page 4-99.
Note
If exchanging the DMUX does not solve the problem, you should test the voltage levels at the DMUX
test points. If voltage levels are not correct, suspect the Power Supply 1.
For test point pin locations, see page YZ738.
For voltage tolerances, see
IBM 3745 Hardware Maintenance Reference, SY33-2066.
4-40
3745 Models 130 to 17A: MIP
Содержание 3745 130
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Страница 68: ...Preface lxvi 3745 Models 130 to 17A MIP ...
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Страница 338: ...Maintenance Aids A 6 3745 Models 130 to 17A MIP ...
Страница 354: ...Abbreviation X 6 3745 Models 130 to 17A MIP ...
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Страница 360: ...IBM Part Number 03F5017 Printed in Denmark by IBM Danmark A S ð3F5ð17 SY33 2ð7ð ð9 ...
Страница 361: ...Spine information IBM Models 130 to 17A IBM 3745 Communication Controller Maintenance Information Procedures ...