IBM 2220 Nways 300, Service Manual

Page: 163 / 264

MAP: Prerequisites for Exchanging a Clock Redrive
Before exchanging a clock redrive module you MUST perform the following Steps.
001
–
1. Locate the clock redrive module that you have to exchange, using Figure 6-17
2. If you have:
Ÿ
Only one clock redrive module installed you are in simplex clock mode.
Ÿ
Two clock redrive modules installed you are in duplex clock mode.
12 1 2 3 4 5 6 7 8 9 10 11
CLK
RD
1
or
2
CLK
RD
1
or
2
Fan Box 2 Fan Box 1
Control Panel
Power Input 2 Power Input 1
Figure 6-17. 2220 Front View
3. In the following table, select your clock mode.
Clock Mode Action
Simplex Go to Step 002 on page 6-46.
Duplex Go to Step 003 on page 6-48.
Chapter 6. 2220 FRU Exchange
6-45