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JVC RX-205

AM/FM Digital Synthesizer Receiver (1990)

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JVC RX-205

Specifications

  • Tuning range: FM, MW, LW

    Power output: 40 watts per channel into 8Ω (stereo)

    Frequency response: 20Hz to 20kHz

    Input sensitivity: 2.5mV (MM), 200mV (line)

    Signal to noise ratio: 70dB (MM), 91dB (line)

    Output: 200mV (line)

    Dimensions: 435 x 118 x 298mm

    Weight: 4.8kg

    Finish: titanium

    Year: 1990

  • Tuning range: FM, MW

    Power output: 40 watts per channel into 8Ω (stereo)

    Frequency response: 20Hz to 20kHz

    Input sensitivity: 2.5mV (MM), 200mV (line)

    Signal to noise ratio: 70dB (MM), 91dB (line)

    Output: 200mV (line)

    Dimensions: 435 x 118 x 298mm

    Weight: 4.8kg

    Finish: titanium

    Year: 1990

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Comments

re: RX-205

Thanks so much for the feed back, lm3875. This unit is one of 5 receiver that landed on me after a boy scouts e-waste event about a week ago, and the low hanging fruit are the first fixes.

So I will get to this over time, and your suggestions are very good food for thought.

I gather these older units, and play with them. Get them working, sell them at ham radio swap meets, where there is a ready market for them.

Then I deduct the cost of parts and turn the proceeds back to the scouts, and so get invited to cheery pick the next year.

The units when scrapped get 7-9c/lb, so if I can turn back $60-100 for each fixer sold they are very happy.

These activities keeps my mind active playing electronic detective, and away from watching too much mindless television

re: RX-205

troubleshooting one in 2019 that landed in my lap for free. Found the 5.5v battery on the lower logic board was down to 3v. add 2 3v lithium in its place. Get am memory presets working after swap of leaking main filter caps. FM can get working with no antenna to set the presets. But put an antenna on fm and the display blinks and blinks audio on fm. Have found a test point on the back of the keyboard board called test, and have tried short, short on power up, etc, to see if I can do anything to get this thing working.

Still a few coupling caps to swap to clean the sound up. Then this is planned to live in the garage, which is why I want to gt the FM working.

Any ideas, crowd?

re: RX-205

The 5.5V "battery" isn't a battery but a .047F or 47000uF backup "capacitor" designated C406. It only gets charged to about 5V and will probably take several minutes to get there if it's good. 6V+ from the batteries might cause problems.
As far as the FM not working with an antenna connected, I'd take a look at the solder connections on the front end pack and IC102 first. It's possible that the PLL is unstable and that could be that C195 (0.47uF non-polar) has high leakage current. Also, check Q125 and Q126. The test voltages are on P37 in the manual down loadable from this site (look in the bottom left corner of the page).

I hope this helps!

re: RX-205

More things to check, it's possible there's something struggling in the power supply. When it tries to indicate "tuned" and "stereo", the DC voltage to the tuner section is sagging and causing this effect. R201 and R202 are a good place to check. It's probably best to check this first...

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