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However, the FM is dead-silent. Tayo RCA patch cable tqiyo the head unit has an embedded wire to carry the amp turn-on signal. Thu Oct 23 Thu Dec 19 After reading your message and also the archived posts concerning the radio problem, I am in agreement with you that the failure must be inside the radio or antenna connection at the radio. Don’t even know whether it is made in Japan. I ran a ga wire from the battery through a 20A fuse and under the carpets to the amp power wire.

Of course that was a Volvo, not Powered by Denizen – Custom Software for volvo Enthusiasts. ALL SV90 I just can’t imagine working in the front seat of the car, referring to the schematic we don’t raiyo to find parts on the circuit board.

Sometimes mere pinout will stop someone in their tracks no pun intended.

AG20P Datasheet PDF

You must essentially bend press these either one side at a time or both together towards sg20 radio by putting the screwdriver in on a slight angle then move outwards to depress the tabs.

The solution was a peice of a cap from a bic pen to separate the two sides of the metal. I printed all the helpful tips about what to check or clean, but I am having a hard time even getting the taijo to slide out of the dash. At least you’ll convince yourself the problem is in the radio, if it is indeed. Oh, here’s where I clarify that my electronics expertise is in embedded systems development.


Spark Gap Source or Replacement

I have a 95 which also has had frequent FM failings. Hi Doug, Prompt and courteous? On the way back, he spied two lions asleep on the road. Vague recollection, but I thought the input diplexer was capacitively coupled for AM with a trimmer for matching. It seemed like somewhere I read alluded to the Alpine connection, and the Volvo documents site talks about Blaupunkt in a “substitutions” list.

I have tried pressing the clips on either side to release the radio, but to no avail. Again, thanks for your prompt and courteous reply! This led me to believe it was taiyl the antenna, but rather something in the radio.

I do not think it is because of anything shorting out but because of some solder pads that are broken. Art, No agg20 for apology. I’ll post any findings back into this thread. Again, thanks for all the info, and I will post back to this list when I finally get offa my unemployed butt and fix this puppy!

But given that same information, I wouldn’t be so sure. But, on that same subject, what would you recommend as to specs for a replacement that WON’T bust?

But if you don’t humor my suggestion, at least be certain about your line’s shield continuity before condemning the radio. Gently touching this thing would cause a complete lose of FM signal. Initially the FM started failing in the winter months and would return when tajyo interior warmed up. I stopped in a car radio place, and the guy was totally clueless.

To complicate matters, the Volvo radio doesn’t have any “speaker” outputs, per se; so I’d have to rig up an amp, blah, blah. Pull the radio and connect it on your workbench. Everything works great – it really woke up the Infinity 6×9’s in the rear deck, esp. Hi Chris, Thanks for your helpful reply. Failed shorted A fifty cent part.


I keep hearing that you can’t “re-use” the Power Amp, if you change to a third-party say, “Kenwood” “head” unit; but I’m not buyin’ it. Figured if you could use a schematic, you’d have a place to work.

Fri Oct 17 I guess someone kinda under-spec’ed that diode, eh? I’m baffled and shocked. The AM is fine.

The spark plug pulses suppress the gain control circuits and the radio won’t work well on the road without this diode package. I just used this technique last weekend to fix my FM radio issue in my 93 with a CR The amp is fastened to the underside of the rear parcel shelf, inside the trunk, just as in the car that donated it.

It took a lot of time and fiddling – electronics is not my forte – but was a fun project and felt good to recycle the old “Volvo” amp Is that an Alpine or Blaupunkt radio or something completely different? One day, his supply of the birds ran out so he had to go out and trap some more. I don’t believe exotic parts were being used in auto radios.

RAdio removal is simple once you figure it out. Maybe at work, where you embed? Anyway, as per usual, it had a broken antenna.