Chapter 25

Repairing faults on automobile radios

As mentioned earlier, the receiving sections of car radio receivers function in the same way as those of domestic sets so the same fault-finding procedures should be used in the output, detector/AVC/AF amplifier, IF amplifier, frequency changer and RF amplifier (if fitted). Only the power supply stages are different and we shall address ourselves to them.

LT problems are infrequent as in general the heaters of valves used in car radios are robust and reliable. In a set for 6 V operation all the heaters will be in parallel, and in the case of glass type an o/c valve will be given away at once by the lack of heater glow. Metal and metal-clad valves will, of course, need to have their heaters tested ...

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