Knowing the output voltage is one thing as you still need to know the secondary output current required as well so that you can get the correct replacement or a suitable alternate supply. When using common Radio Shack 14.4 volt bayonet. ( correct) The three wires are Black, Blue and Red Black-Blue 2.5 ohm. If it is NOT working simply ignore the post. that will read up to 24 volts (try Radio Shack or another such supplier). I will give you the details of the trans itself to see if it working or not. You may have to be quick in case the fuse blows again due to an internal fault in the transformer The stock tuner uses a series 27 ohm resistor to drop the voltage to 24 VAC, as 8 volt bulbs were used. The white wires from the button and the transformer are connected under a. If there is one there and it is blown you could try replacing it (hopefully its rating is stamped on it) and then check if the primary winding is OK and if so connect power to it and measure the output voltage on the secondary. Not sure if it is on the primary or the secondary or even if it is buried within the windings and not on the top under the insulation, but maybe worth a look. Long shot maybe but try gently removing the insulation covering the windings on the transformer as some transformers have a cutout thermal fuse inserted in the transformer. I assume that the faulty transformer is connected to the J4 connector on the board in image 3, is this correct? 12.00 3.50 shipping SPONSORED 20 PCS CENTER TAPPED Radio Shack Archer Power Transformer 12V AC CT 12 VAC 400.00 9.61 shipping SPONSORED CENTER TAPPED Radio Shack Archer Power Transformer 12V AC CT pc mount 12 VAC 24.50 4.15 shipping SPONSORED Realistic 32-1031 b 70 Volt 10 Watt Line Transformer RADIO SHACK SPEAKER PA (1) 24. Would that be correct? Could I damage anything with 12V - Would 10V be better? If I had to take a guess, it would be 12V supply to the board. Scott - i have the same wifi t-stat and a millivolt gas fireplace at our cabin. The electrolytic capacitors are rated at 16V, the IC is rated at 7-40Vand the regulator is rated at 5V out and 5 to 18V in. The transformer is 20A 24V.the relay is 10A. The rectifier is connected directly to some electrolytic capacitors, the LM340T5 voltage regulator, an IC - TL494 and the small capacitors associated with the LM340T5 as listed above. The main transformer is connected directly to a RMS401L rectifier (Max 35V). Is it possible to workout the supply voltage from the voltage regulator and the components around it - capacitors and resistors?ĭo you mean the tiny capacitors near the regulator that I gave the numbers for, or the electrolytic capacitors? Input Voltage: AC 100-240V, 50/60Hz.Great for replacement or travel back up 100 Brand New,Manufactured with the highest quality materials (non-OEM). The transformer is connected to the two pins shown in photos 1 and 3. It has 4 primary windings and a single secondary winding. There does not appear to be a thermal fuse within the transformer.
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