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ATARI Light Pen Operator's Manual
APPENDIX C - TROUBLESHOOTING
What to Do if Your ATARI Light Pen Does Not Respond as Expected
1. Check that the program was entered correctly.
2. Make sure the pen connector is properly seated in the controller
jack.
3. Make sure there is no dust or dirt in the tip of the light pen.
(See Periodic Maintenancei
Section 9. >
4. Check the luminance level used in your SETCOLOR statement. If it is
too low> the pen may fail to respond. Try a higher level setting.
5. Check the brightness setting of your television set. If it is too
lowi
the pen may fail to respond.
6. Check to see if the pen switch is working correctly. With the
switch on (pen pressed to the screen) and the pen plugged into jack
#l» type in PRINT PEEK (632). The value returned should be 14. Lift
the pen and repeat the PRINT PEEK (632). The value returned should
be 15. If these do not match*
you may have a defective switch or
jack.
7. If you have problems in step 6* test for a defective jack by
plugging the pen into jack #2 instead. Repeat step 6 but use
location 633 instead. If you have no problems* the jack is faulty;
if the problem still exists (#6 only)* it is the light pen switch.
8. Do not attempt to disassemble the pen. Refer any repair to an
authorized
ATARI Service Center.
Troubleshooting - 51
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