HP48SX - shift keys won't stay shifted - preliminary report
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03-13-2014, 07:11 PM
Post: #6
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RE: HP48SX - shift keys won't stay shifted - preliminary report
I very well could be misunderstanding something, but would voltage drops only affect whether a key is detected?
I think, the reason is key press itself (some sort of leakage) + activated subroutine (rising CPU current). Other symptom is notable screen contrast cyclic reduce, while key pressed. If power regulator is faulty - drops may be critical for stable CPU functioning, causing "strange" side effects. |
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Messages In This Thread |
HP48SX - shift keys won't stay shifted - preliminary report - Bruce Larrabee - 03-13-2014, 11:46 AM
RE: HP48SX - shift keys won't stay shifted - preliminary report - W_Max - 03-13-2014, 03:29 PM
RE: HP48SX - shift keys won't stay shifted - preliminary report - Han - 03-13-2014, 06:31 PM
RE: HP48SX - shift keys won't stay shifted - preliminary report - Bruce Larrabee - 03-13-2014, 03:33 PM
RE: HP48SX - shift keys won't stay shifted - preliminary report - HP67 - 03-13-2014, 06:41 PM
RE: HP48SX - shift keys won't stay shifted - preliminary report - W_Max - 03-13-2014 07:11 PM
RE: HP48SX - shift keys won't stay shifted - preliminary report - Bruce Larrabee - 03-14-2014, 04:53 AM
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