May 2014
Intermediate to advanced
320 pages
13h 41m
English
Content preview from Servicing Personal Computers, 3rd Edition
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255
^mmÊHÊÊÊÊ'
m
-y,
^Ψ^Φ*
Figure 6.40. IBM PC-XT power supply filter and fuse assembly
Figure
6.41.
Using
a
logic probe to check CPU signals in an IBM PC-XT
256 Servicing Personal Computers
Tables 6.14 to 6.16 give typical resistance and voltage indications measured at the system
board power connector and fixed disk connector of the PC-XT (see Figures 6.35 and 6.36
respectively).
Readers experienced with servicing the original PC and PC-XT will have little trouble
adapting to the PC-AT. The AT employs an 80286 microprocessor (U74) and 80287