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Hello my dears. .
I would like to invite you to a short teardown of an old Polish Taraban 2 radio, which unfortunately came to me already in a rather bad condition. As standard, I will present here detailed photos from the inside and then post the schematic and documentation.
Taraban 2 - DMP-602 .
Taraban 2 receives long wave, medium wave, short wave and UKF. The AM intermediate frequency is 465kHz and FM is 10.7MHz. For more details, I refer you to the manual:
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Which connector is which, button roles, etc:
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Photo of the front, the scale is illuminated using ordinary 6.3V/0.2A bulbs, which we will see soon.
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The receiver, unfortunately, I have already salvaged in very poor condition. Both the casing and the interior:
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The back plate is missing, the electronics can simply be removed along with the front:
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Antenna connector also torn out:
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There is a spatial arrangement of the elements in the documentation:
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PCB tracks. Some of the solders look poor:
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Time for clearer pictures of the board. I had to at least pre-clean it, the layer of dirt is extremely thick.
Here you can see, among other things, the fuses, the 1PM05 rectifier bridge and the UL1211 IC:
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We even have the board voltages listed in the service manual:
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Rails with potentiometers, switches:
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The mechanism for switching ranges is shown well in the manual:
Tonsil speaker GD10-16/5/2 5W 4Ω Made In Poland:
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The second IC inside is a UL1481 CEMI, together with a heatsink:
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Ferrite antenna, tuning capacitor:
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Transistors w.c. BF194 in the characteristic housing of the time:
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BF215 transistor and a characteristic capacitive diode (warp) with a green dot, probably BB105G (yes, I checked on the schematic).
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The aforementioned backlighting - the bulb:
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Out of sheer curiosity I decided to check the capacitance and ESR status of the ELWA electrolytic capacitors from inside this radio. For this I used a rather expensive ESR70 meter that I have tested and know does not overestimate the measurements. Would the capacitors be in poor condition or also perhaps their capacity has increased? Let's see:
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Capacities are consistently higher than nominal, but overall it is not so bad, although I refer to the ESR tables to assess specific results. The results are repeated for a further 100uF/220uF not included in the images.
Service manual (in Polish) .
For this radio, detailed documentation and instructions in Polish are available online. I don't see the need to over-quote it here, I'm simply attaching the PDF for download (schematic also inside):
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Summary .
A radio in much worse condition than the ones I usually find. I don't know how much time it has spent in the air and rain. I know you can get one very cheaply in good condition, but it's not about just buying. Maybe if I fix the solders I can get something going with it. At least the head doesn't look like it's been tampered with, so it's better than if it had been completely ripped out due to some failed attempt at UKF tuning.
That's it for now, perhaps I'll come back to this receiver in another topic in the form of commissioning+tuning.
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