ConAir ED11206 PSU 13.5VDC/4A "As Built" Schematic and Pictures - Page 1
Forum section: electronics / repair

author: t1d
author_rank: Super Contributor
timestamp: October 22, 2024, 11:12:51 am
content: I am not an Electrical Engineer.I have no formal training in electronics.I do not guarantee the accuracy of any ofthe information/drawings/pictures/etc.Use at your own risk.I take no responsibility, or liability,for anything.This is for my model version (R3?). Yours may be different, of course.The output socket has been removed from my board.I added the short strand of white wire for a modification. It is notpart of the original device. You may notice other modifications.I believe the circuit is a center tapped full wave rectifier operation.Both of the two parallel windings supply 12.78VAC and are referencedto Center GND. However, the exact arrangement of the Pin Legs of theSecondary Windings was not investigated. I would think that thesewindings would have to be wired out of phase, to accommodate the useof just two rectifying diodes (SR1660 is a dual diode.)However, I am not certain. If someone wants to explain the completeoperation of the circuit, that would be helpful and wonderful.For both fusesBrand = "bel" (?)5TT5A - 125VC1 = 4700uF/25VSome lettering on the board =PCB76UV-01WL UR(INVERTED) 94 V0V30I am posting this information, solely as a "good Samaritan," as Iwas unable to find much information about the unit on-line.I hope it helps someone.

author: coromonadalix
author_rank: Super Contributor
timestamp: October 22, 2024, 11:53:32 am
content: pls remove the pcb and show photo from underyou schematics does not seem okay if you have center tapped xformer you don't trace it like your schematicwe need to see the x-former secondaires to check if they are in serial w a center tap or in parallel etc ....the center tap would act as the ground line witch is not in the schematic

author: t1d
author_rank: Super Contributor
timestamp: October 22, 2024, 11:27:06 pm
content: "pls remove the pcb and show photo from underyou schematics does not seem okay if you have center tapped xformer you don't trace it like your schematicwe need to see the x-former secondaires to check if they are in serial w a center tap or in parallel etc ....the center tap would act as the ground line witch is not in the schematic"Thank you, coromonadalix, for your reply and help. The PCB is now hardwired into the case with my own additions = power switch and LED. The wires are too short to lift the PCB to get a clear picture of the bottom. However, I have added the "As Measured" secondary output VAC values, from which you can understand how the circuit operates.Look at picture/image xx68. You will see that the schematic shows the correct positions of the offsets of the secondary positions, on the PCB. I did sketch the bottom carefully and verified (repeatedly) the traces. The tape over the transformer windings prevents me from being able to discover the the exact pinout of the secondaries and, therefore, the exact relationship of the two secondary coils is unknown. I do not desire to peal back the tape, lift the secondary pins, or to do further testing by injecting a known wave form and checking the secondary phasing with a scope. The information that I have provided should be a helpful start to anyone needing to troubleshoot their own unit.Thank you, again.