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I f this check shows a 5 - Volt supply at less than 4 . 8 Volts , perform the
in Sect ions 3 . 1 1 . 2 ,
checks
" Expansion Board Check . "
another feature board, the power supply shou l d be repl aced .
•
Pin 1
Pin
7 Gnd.
14 PIN MODULE
Figure 3 - 6 .
Pin Ident i f icat ion
3 . 1 1 . 2
FEATURE BOARD LOAD I N G CHECK
For this check, each feature board is removed one at a time and the au
tomatic diagnos tic testing is run between each remova l .
CAUT I O N :
The MMU board i s not a feature board .
equipped with a n MMU board, do not remove i t a s part of th i s
chec k .
Note :
I f a memory board is removed in this check, any memory boards above
it should have their addres ses changed to e l iminate gaps in the address ing
s cheme .
When the memory board is reinserted , the addres ses should be
restored .
Remove each feature board and test individua l ly to conduct feature board
loading check .
A feature board is defective and should be replaced during
the check i f the fault disappears when the board is removed and reappears
when
it
is
reinserted .
removal / insert ion board continuity at each s lot leve l .
fol l owing assumes that the processor unit is f u l ly populated .
fewer boards , stop when the l ast board has been tested .
Optional Diagnos t i c , Voltage , and Res is tance Checks 3 - 1 9
" Feature Board Loading Check" and 3 . 1 1 . 3 ,
If the l ow voltage is not caused by l oading from
( +
Pin 1
Pin 14
Volts)
5
Pin 8
Use
the
fol l owing
•
(+
Pin 1 6
Volts)
5
16 PIN MODULE
I f your system i s
procedure
to
ver ify
The procedure
If you have
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