orange_hand Posted June 7, 2011 Report Share Posted June 7, 2011 (edited) Hi, I have completed my MB6582 Base PCB and I did some voltage checks (I went for option B, the original C64 power supply). I haven't installed any IC's so far ! What you can not see on the first picture are the following checks: J3 (5V) -> 5,33 V J25 (9-11V) -> 14,28 V -> is this still ok ? C12 (9V) -> 8,97 V I made a mistake in the beginning when I checked J25. Unfortunately I slipped off with the contact and created a short on J25 (for a very short moment). After this I check all the points above with the result: 5 V check points -> 5,33 V 9 V check points -> 8,98 V (regarding the SID's: depending on the jumper - I have tested both positions, 9V and 12V) 12 V check points -> 11,82 V (regarding the SID's: depending on the jumper - I have tested both positions, 9V and 12V) I wonder if I have damaged the two big capacitors close to the voltage regulators ? I mean the measurements look quite ok, apart from the J25 which has 14,28 instead of 11 V. Do you think I can carry on with the board, or do I need to exchange the capacitors or the voltage regulators ? Your advise is much appreciated ! Cheers orange Edited June 7, 2011 by orange_hand Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted June 8, 2011 Report Share Posted June 8, 2011 (edited) Hi, I have completed my MB6582 Base PCB and I did some voltage checks (I went for option B, the original C64 power supply). I haven't installed any IC's so far ! What you can not see on the first picture are the following checks: J3 (5V) -> 5,33 V J25 (9-11V) -> 14,28 V -> is this still ok ? C12 (9V) -> 8,97 V I made a mistake in the beginning when I checked J25. Unfortunately I slipped off with the contact and created a short on J25 (for a very short moment). After this I check all the points above with the result: 5 V check points -> 5,33 V 9 V check points -> 8,98 V (regarding the SID's: depending on the jumper - I have tested both positions, 9V and 12V) 12 V check points -> 11,82 V (regarding the SID's: depending on the jumper - I have tested both positions, 9V and 12V) I wonder if I have damaged the two big capacitors close to the voltage regulators ? I mean the measurements look quite ok, apart from the J25 which has 14,28 instead of 11 V. Do you think I can carry on with the board, or do I need to exchange the capacitors or the voltage regulators ? Your advise is much appreciated ! Cheers orange Hi, 14,28V on J25 pins instead of 11 V is ok ! This voltage is formed from : Your PSU ~9V out - bridge rectifier - filter electrolytic capacitor - voltage on J25 The other voltages look right, too. Regards , Janis Edited June 8, 2011 by Janis1279 Quote Link to comment Share on other sites More sharing options...
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