Mk3 (GHD3, 3.1B, SS2 etc)
Mk3 PCBs virtually never fail. The only real issue we've come across is dodgy switches which can be fixed with a bit of switch cleaner.
Mk4 (GHD 4.0B, 4.1B, 4.2B, SS4.0 etc) & Mk5
Mk4 & Mk5 PCBs normally fail with R8 or R11 resistor failures. If your irons are dead, then it could well be one of these resistors is open circuit. See the R8/R11 page for more information.
The other resistors on the PCB are very high resistance (>1Meg Ohm) so you may not be able to measure them. This does not mean they are faulty - the only resistors that ever fail are R8 and R11.
If your board does not have an R8/R11 resistor problem and you are sure it's the board (i.e. heaters measure correctly, thermal fuse and cable are ok etc) then here are some problems that have been reported:
- C5 faulty - replace with T491B107M006AT CAPACITOR, TANTALUM, 6V, 100UF
- C1 and D9 dead
- Main PIC processor failed. We stock three types of replacement preprogrammed PICs on the shop - Mk4 round buzzer, Mk5 round buzzer, Mk4 & Mk5 square buzzer.
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