IBM 2140, 2142 (continued) , 2-40

(continued)
005(continued)
DID THE SYMPTOM CHANGE?
Yes No
006
Go to Step 008.
007
– Check the Media Console cable for continuity. See “Media Console
Cable” on page 5-16 for pin locations.
– Depending on service procedures, replace the keyboard, Media Console
host card, Media Console client card, Media Console cable, or Media
Console.
– If the symptom remains, replace the system board.
008
– Power-off the system unit.
– Disconnect the keyboard cable connector from the system board (Type
2140) or from the Media Console (Type 2142).
– Power-on the system unit.
– Check the voltage at the keyboard cable connector on the system board
or the Media Console as shown in Figure 2-4, after the POST.
Note: Measure voltages with respect to Ground (Pin 3). These
measurements are for the system board (Type 2140) and for the
Media Console keyboard connector (Type 2142).
Pin
1
2
3
4
5
6
Voltage (Vdc)
KBD Data (+5.0)
Not Used
Ground
+5.0
Clock (+5.0)
Not Used 1
6
2
3
4
5
Figure 2-4. Keyboard Connector Voltage Check
(Step 008 continues)
2-40