Electronics > Repair
ConAir ED11206 PSU 13.5VDC/4A "As Built" Schematic and Pictures
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t1d:
I am not an Electrical Engineer.
I have no formal training in electronics.
I do not guarantee the accuracy of any of
the 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 not
part 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 referenced
to Center GND. However, the exact arrangement of the Pin Legs of the
Secondary Windings was not investigated. I would think that these
windings would have to be wired out of phase, to accommodate the use
of just two rectifying diodes (SR1660 is a dual diode.)
However, I am not certain. If someone wants to explain the complete
operation of the circuit, that would be helpful and wonderful.
For both fuses
Brand = "bel" (?)
5TT5A - 125V
C1 = 4700uF/25V
Some lettering on the board =
PCB76UV-01
WL UR(INVERTED) 94 V0V30
I am posting this information, solely as a "good Samaritan," as I
was unable to find much information about the unit on-line.
I hope it helps someone.
coromonadalix:
pls remove the pcb and show photo from under
you schematics does not seem okay if you have center tapped xformer you don't trace it like your schematic
we 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
t1d:
"pls remove the pcb and show photo from under
you schematics does not seem okay if you have center tapped xformer you don't trace it like your schematic
we 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.
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