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9.2.1 Configuration of the CPU memory unit


9.2.1 Configuration of the CPU memory unit
A CPU memory unit is composed of the following two parts: the CPU memory unit lower and the CPU memory unit upper.
Figure 9-1  Location of CPU memory unit
Figure 9-1  Location of CPU memory unit
Location number Component
CPU memory unit upper (CMUU)
CPU memory unit lower (CMUL)
There are two types of CPU memory units: FRAME-A and FRAME-B. The type of CPU memory unit can be determined from the indication on the label (A in Figure 9-2). If a CPU memory unit does not have the "FRAME-B" indication, it is a FRAME-A unit.
Note - FRAME-A and FRAME-B cannot be installed if they are mixed because they are not compatible with each other. Especially when performing replacement work, be careful not to mix the top cover and left- and right-side guides of the replacement CPU memory unit with those of the CPU memory unit being replaced.
Figure 9-2  Type of CPU memory unit
Figure 9-2  Type of CPU memory unit