IBM 5280 Manual page 79

M P
6 6
DATA ENTRY MAP
A-AI DISPLAY
PAGE 7 OF 18
020
Defective Diskette/Main MPU
card (A-Cl)
(~lIM
303).
If a 'ROS Patch' cable is
connected to the card,
GO TO MAP 0600. ENTRY POINT A.
021
Probe A-A3B05,
(HIM 531).
'1 MHz clock'
Up light: On
Down light: On
Are the lights correct?
Y N
t
022
For the line probed in the
previous step,
Up light: Off
Down light: On
Are the lights correct?
Y N
023
- 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.
R
MAP 1010-7
024
- Power off.
- Set the CE meter to the RXI
scale.
Connect the positive lead to
A-A3B05,
'1
MHz clock', and the
negative lead to ground.
Is the meter reading 30 ohms or
above?
Y N
025
- Leave the meter connected as
in the previous step.
- Use the net list (MIM 531).
Remove each card in the net,
one at a time, until the
meter reads 30 ohms or above.
- Replace the last card
removed.
- If all cards in the net have
been removed and the meter
reading is still below 30
ohms, suspect a ground on the
Logic Board.
026
- Defective Diskette/Main MPU
car d (A- C
1) (
M I M 303).
If a 'ROS Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
EC840874 PEC839787
Q R MAP 1010-7