IBM 5280 Manual page 106

P
Q
R
5 5 5
DATA ENTRY MAP
A-AI KEYBOARD
PAGE 6 OF 11
020
- Use MIM 219 to trace the '+
Serial Data Clock' line for
opens or grounds.
- OR
Defective Keyboard
card (MIM 101).
- - - - OR
Logic
- Defective Keyboard Pad PC
Board (MIM 101, 127).
021
- Defective Keyboard/Display
MPU card (A-AI) (MIM 200).
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
022
- Use I'1IM 219
Serial Data
to trace the '+
Clock' line for
opens or grounds.
- OR
Defective Keyboard/Display MPU
Card (A-AI) (MIM 200).
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
N
5
MAP 1020-6
023
Probe A-Al-TP2, '- Strobe
Keyboard A' (MIM 200, 219).
Up light: On
Down light: Pulses with a
key pressed.
Are the lights correct?
Y N
024
- Probe JOI-004, '- Strobe', on
the Keyboard Logic card (MIM
219).
Up light: On
Down light: Pulses with a
key pressed.
Are the lights correct?
Y N
025
- Power off.
- Disconnect
200,219).
Power on.
POI ( MII'1
- Probe JOI-004, '- Stt~obe',
on the Keyboard Logic Card
(MIM 219).
Up light: On
Down light: Pulses with a
key pressed.
Are the lights correct?
Y N
EC840874 PEC839787
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STU V MAP 1020-6