IBM 5280 Manual page 48

B
1
BASE MAP
MAIN MPU ATTN ERROR
PAGE 2 OF
4
002
- Install terminating resistor
(PN:4177566) (5.1K) from A-C4D03
to A-C4D13 (MIM 501).
Install a jumper at A-CI-TP40 '
Test POR' (MIM 303).
Probe A-C4D13 ATTN to
KBD/Disp' (MIM 501).
- Observe the lights as you
momentarily ground the jumper to
frame ground.
Up Light: On
Down Light: Pulse
Are the lights correct?
Y N
003
Defective Diskette/Main MPU
card (A-Cl) (MIM 303).
- If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
004
- Check location A-ES for a card
(MIM SOl). If a card is
installed, check MIM 402 and 811
to see which card you have
installed.
Is the feature Main MPU card
installed in location A-ES?
Y N
C
OOS
Ensure that the
A-E7D09 to
installed.
jumper
A-E7DIO
GO TO PAGE 3, STEP OOS,
ENTRY POINT AA.
from
is
C MAP 0511-2
006
Install terminating resistor
(PN:4177566) (5.IK) from A-E7D03
to A-E7D09 (MIM
S~l).
- Probe A-E7D09 '- Attn to
KBD/Disp' (MIM 501).
- Observe ,the lights as you
momentarily ground the jumper to
frame ground.
Up light: On
Down light: Pulses
Are the lights correct?
Y N
3
D
007
- The Logic board is open
Attn to KBD/Disp' (MIM 531).
OR - - - -
Defective Feature Main MPU
card (A-ES) (MIM 303).
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
EC840S74 PECS39787
MAP 0511-2