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139
KEYBOARD CLICKER MINI MAP
• Use this figure to locate a keyboard clicker problem.
• For Mini MAP example, see Troubleshooting Aids (212).
Conditions after Power-On
• The '+8.5 Vdc' line is active.
• The' -clicker activate' line is at an Up level.
Service Aids
• The' -clicker activate' line pulses at a Down level
when a key is pressed causing the clicker to sound.
This line also pulses each time the program loops in·
Test mode.
• The clicker coil can be tested by removing the lower
wire from the connector block and touching ground.
• The display station will not· be damaged if
powered-on after the keyboard cable is
disconnected.
Planar
+8.5Vdc
1·B·Bl1
Internal
Keyboard
Cable
13
Tools
Connect the CE probe as follows:
• +lead-1-G- D03
• -lead-1-G-D08
• Ground-1-B-D08
Keyboard
Signal
Cable
D02
Access
Panel
11
B 11
»
»
I
I
Keyboard Logic
Printed Circuit
Board
Clicker
-Clicker Act!v,.e
~
1-B-B03
i
~
B~3
~~~»=~--------~»~------~.~~
Driver
I
I
I
1-28
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