Use Of Sams; Example Of A Sam - Control Data Corporation CDC CC63X Hardware Maintenance Manual

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Each SAM listing is identified by a SAM number and a title that
denotes the type of problems that it covers. A hyphen and number
following the SAM number identifies the pages within the listing.
USE OF SAMs
The SAMs are to be used in conjunction with the diagnostics
described earlier in this section. After diagnostics are run, or
if they cannot be run, refer to the SAM that covers the existing
problem. Verify that all assumed conditions stated at the
beginning of the SAM are present and observe any preliminary
instructions. Enter listing and answer yes (Y) or no (N) to the
question asked or the condition being tested. Follow down the
appropriate Y or N column and when column leads to action
numbers, perform the corresponding actions in numerical order to
correct the problem.
MAINTENANCE
SYMPTOM/QUESTION
RESPONSE FOR QUESTION
INDICATES FOOTNOTE
(NOTES ARE LISTED ON
LAST PAGE OF SAM)
BEING ASKED
62947918
STEP NUMBERS
I
SAM 4271
(USED FOR IDENTIFICATION ~
PURPOSES ONLY) I .
"'his
S~M
assur.
~s
power is applied and circuit breaker CBl does
I.
,t tr lp.
PATH TO FOLLOW FOR YES
(Q]})O
Blank screen (no video or raster) CONTRAST and
RESPONSE TO F I R S T : :
INTENSITY controls have no effect?
QUESTION
0021~
Y N Raster present (screen lit) but no video?
003~:
: Y N Video display or control problem?
INDICATES THAT THIS IS
004 : : Y N Offline keyboard input problem?
THE ONLY ACTION TO BE
05 ; ; ;
~ ~
N Power on diagnostic error? (1)
TAKEN
I ' . : : : :
006 : : : : .
1
Run auto tests (enter B4200). If unable to
establish communication, chec~ I/O connectors,
F
A,CRTS'T
O
NA-C-T-'-O-N-T-O-B-E-~---.-"';I~---00-7-:.·.·
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l
::·-·
~.~.
- I
~:~:~~(~e~!~~e f~;t:~:7:~~n~:~d.
If problem
~ Check for loose internal cable connections.
PERFORMED IN THIS
008 : :
;~~~~e~or
correct seating of applications
COLUMN
UNDERLINE INDICATES
THE LAST OF A NUMER-
ICAL SEQUENCE OF
ACTIONS IN A GIVEN
COLUMN
009
010
011
N'
014
~~
SECOND ACTION TO BE
I
~~
PERFORMED IN THIS
~
017
~
4
:OD~~:;ES
SAM IS
CON---~--
I
018 :
TINUED ON PAGE 2, ;
COLUMN A .
®
62940034 E
Figure 6-2.
Replace applications module (para 3.3).
Replace logic/power supply board (para 3.4).
Replace keyboard assembly (para 3.11).
Chec~ INTENSITY and CONTRAST controls for open
circuit (para 3.13.2). Replace if open.
Check monitor PC board adjustments (para
3.8.2) •
Replace monitor PC board (para 3.8).
Check Video Faston connector (J5 pin 6).
Check fuse F3 (3.0 A fast blow).
Check for open CONTRAST control (para 3.13.2).
Check 30 V Return Faston connector (J5 pin 2).
VISUAL DISPLAY/CONTROL PROBLEMS SAM 4271-1
Example of a SAM
03388
6-13
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