Download MLDL2000 User Manual

MLDL 2000
9.
USER MANUAL
Remove all modules from the HP41, put the Interface PCB in the lower part of the cardreader and plug it in the HP41. Be
very careful when aligning the connector. Do NOT turn the HP41 on yet. The HP41 should be running on batteries or an
external adapter.
10. With the HP41 OFF verify the following voltages with a digital voltmeter, by using one of the soldered black wires as your
GND reference.
• J3 pin 1 = 0V
J3 pin 2 = ~2.3V
• J4 pin 1 = 0V
J4 pin 2 = 0V
• J7 pin 1 = ~5V J7 pin 2 = 0V
J7 pin 3 = 0V
• J2 pin 1 = ~6V (only if the hP41 has batteries installed)
11. Switch the HP41 on and convince yourself that your precious machine is still working by doing a CAT3
12. With the HP41 switched ON but not running verify the following voltages
• J3 pin 1 = 0V
J3 pin 2 = ~2.8V, a bit higher that in step (9)
• J4 pin 1 = 0V
J4 pin 2 = 0V
• J7 pin 1 = ~6V J7 pin 2 = 0V
J7 pin 3 = 6V
• J2 pin 1 = ~6V (only if the hP41 has batteries installed)
13. Now write a small program on your HP41 that executes an endless loop, run this program and verify the following
voltages:
• J3 pin 1 = 3.3V J3 pin 2 = ~2.8V, a bit higher that in step (9)
• J4 pin 1 = 3.3V J4 pin 2 = 0V (maybe slightly over 0V)
• J7 pin 1 = ~6V J7 pin 2 = 0V
J7 pin 3 = ~1V (with a scope you will see SYNC pulses)
• J2 pin 1 = ~6V (only if the HP41 has batteries installed)
Version 1.51
Meindert Kuipers
10/23/2008
www.kuiprs.nl
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