3745 FRU Exchange Procedure
A
B
C
D
E
F
G
H
J
K
W
Y
Z
LI
C
LI
C
LI
C
LI
C
LI
C
LI
C
LI
C
LI
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
Summary of Contents for 3745 130
Page 2: ......
Page 10: ...viii 3745 Models 130 to 17A MIP ...
Page 16: ...xiv 3745 Models 130 to 17A MIP ...
Page 23: ...Safety Figure 0 2 Ground Wire Connection on Controller Expansion Safety xxi ...
Page 46: ...Safety xliv 3745 Models 130 to 17A MIP ...
Page 47: ...Safety Safety xlv ...
Page 48: ...Safety xlvi 3745 Models 130 to 17A MIP ...
Page 49: ...Safety Safety xlvii ...
Page 50: ...Safety xlviii 3745 Models 130 to 17A MIP ...
Page 51: ...Safety Safety xlix ...
Page 52: ...Safety l 3745 Models 130 to 17A MIP ...
Page 53: ...Safety Safety li ...
Page 54: ...Safety lii 3745 Models 130 to 17A MIP ...
Page 55: ...Safety Safety liii ...
Page 56: ...Safety liv 3745 Models 130 to 17A MIP ...
Page 57: ...Safety Safety lv ...
Page 58: ...Safety lvi 3745 Models 130 to 17A MIP ...
Page 66: ...Safety lxiv 3745 Models 130 to 17A MIP ...
Page 68: ...Preface lxvi 3745 Models 130 to 17A MIP ...
Page 70: ...Amendments lxviii 3745 Models 130 to 17A MIP ...
Page 154: ...3745 MAPs 1 84 3745 Models 130 to 17A MIP ...
Page 200: ...Service Processor MAPs 2 46 3745 Models 130 to 17A MIP ...
Page 226: ...Diagnostics 3 26 3745 Models 130 to 17A MIP ...
Page 253: ...FRU Exchange Location 01S Figure 4 31 3745 EPO Chapter 4 3745 FRU Exchange 4 27 ...
Page 332: ...CE leaving procedure 4 106 3745 Models 130 to 17A MIP ...
Page 338: ...Maintenance Aids A 6 3745 Models 130 to 17A MIP ...
Page 354: ...Abbreviation X 6 3745 Models 130 to 17A MIP ...
Page 359: ......
Page 360: ...IBM Part Number 03F5017 Printed in Denmark by IBM Danmark A S ð3F5ð17 SY33 2ð7ð ð9 ...