The Repair Process Print
Written by Bryce Ringwood   
Thursday, 14 October 2010 09:19

Every repair starts with a thorough visual inspection as to the age and condition of the set. The make and model number are noted and a search for documentation is carried out. This is so that the correct parts are used and the set can be correctly disassembled and reassembled later. Then I proceed along the following lines, avoiding the temptation to “plug in and switch on” :-

  • The set is removed from its cabinet and the chassis is cleaned. If you are planning on doing this yourself, you should use a dust mask. While on the subject of safety, take care when handling heavy radios and equipment.

  • The wiring is inspected and any obviously burned-out parts are noted.

  • Any tampering or user-modifications are noted.

  • Any perished wiring is replaced with modern wiring as close as possible in appearance and type to the original.

  • Burned-out parts (usually resistors) are replaced with the same type and power rating. The capacitors or other components they are connected to are checked and replaced.

  • Panel lamps are checked and replaced.

  • Wafer switches are cleaned

  • The mains cord is replaced with a modern 3-core cord and the chassis is earthed, unless there are considerations preventing this.

  • The dial-cord is replaced, if necessary.

  • Now the set is slowly “brought to life” by applying a small initial AC voltage and bringing it up to full AC 230 volts (or 110 volts) using a variable AC power supply very slowly indeed. If at any time a component fails or overheats, the process is halted and the problem is resolved. All work is done on the set whilst it is isolated from the mains – after all, some sets were deliberately designed with a “live chassis”!

  • Most sets have very minor faults and will now be fully or partially operative at the end of this process.

    Now the troubleshooting can begin.

Last Updated on Friday, 15 October 2010 09:14