There You go. What a beautiful workmanship, this exciter/receiver. Can anyone help me obtaining documentation on this piece of equipment?
[27-sep-2010]
The radio is now on the workbench. As I fired it up the first time, an error showed up. With a 24V/5Amp power-supply connected to connector 57, all seems OK when the radio is in "standby" mode. Just a single "dot" is lit in the centre of the display, indicating the oven of the build-in timebase is heated. When the unit is switched to "Receive", the display slowly comes up until normal light-intensity, then suddenly goes dead. This process repeats itself for two to three times, after which the current-overload switch at the rear of the unit engages and disconnects the radio from the power source.
I suspect a fault in the build-in power-supply. This unit's primary function is to generate all four internal DC-supply voltages out of the outboard DC power-supply, that may range from 11 - 31 Volts according to the (scarce) documentation I came across. Main suspect is the multivibrator-unit in the build-in power supply, consisting of a shielded transformer in combination with a couple of powertransistors and some other electronics.
Yesterday I have disassembled the radio and detached the build-in power-supply from the main chassis. This was a piece of cake. Equipment like this is a joy to service. Outstanding design, both electronically and mechanically.
[28-sep-2010]
Yesterday night I managed to further disassemble the built-in-but-now-detached power-supply. The semiconductors that form part of the multivibrator all turned out to be OK, leaving no other clue as to the cause of the malfunction for the moment :(
Electrolytic capacitors, another often occuring source of trouble, all seem OK as well based on first visual inspection. All other power-semiconductors mounted to the rear-panel of the powersupply proved to be OK too. Further (stand-alone) testing of the power-supply is difficult, since the power-supply needs some external contrl-signals to be switched to it's various modes, and without docs I do not have a clue what wires are used for this.
To be continued <I hope..>
