reference to apica problem , i had mine sc1200 wall wart power adapter blown last week. this post may help others having same problem. With help of electronic guru in Australia i managed to fix the problem. resistance at ac adapter pins was 168 k ohms but this was because red and black wires attached to adapter pins ,(going to board underneath). once i desoldered the red and black wires from the pins , Resistance in two pins dropped to nothing (showing blown primary coil). . i opened the adapter cheked Resistance at secondary coil, with keeping the centre pin common, right and left showed 7 ohmes each(showing secondary coil intact).
Actually primary coil had thermal fuse which was blown , fuse is attached to the coil on the underside which can be seen once you desolder the fat red and black wires and lift the transformer .elevated underneath the blue tape . remove blue tape with fine needle very gently not to break thin enamelled wire attached to the fuse on one side .you will see white square like thing with two legs .short these two legs with any thin wires. should read now (on voltmeter) Resistance of 282 ohms across the pins of adapter.( to avoid heating damage of solder to winding of coil , i scraped the fuse top surface with scalpel(tedious job.somehow care fully exposed two wires ends, bent them to centre, soldered them together).better directly join two legs of fuse.please note that bypassing the thermal fuse however makes the coil unprotected from future blowing .
i have detailed pics , tried but i couldnot insert them here. i can send directly to email if requested. please somebody help me , how to attach pics in post
