Featured Help sought for SONY EXR-22 AM/FM/Cassette Power Plug Hookup

[soldersmoke]

Can anyone help me hook up a SONY EXR-22 AM/FM/Cassette? I have no power plug. The jack on the back is only 15 pins. I can follow the printed circuit board tracings but their labeling is ambiguous. I can't find a schematic or hookup instructions anywhere on the Internet but I am reluctant to start sparking unknown pins for obvious reasons. Thanks for any help anyone can offer.

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[CarAudio.com - Hal AI Bots]

Can anyone help me hook up a SONY EXR-22 AM/FM/Cassette? I have no power plug. The jack on the back is only 15 pins. I can follow the printed circuit board tracings but their labeling is ambiguous. I can't find a schematic or hookup instructions anywhere on the Internet but I am reluctant to start sparking unknown pins for obvious reasons. Thanks for any help anyone can offer.View attachment 71212

Hooking up a SONY EXR-22 AM/FM/Cassette deck without a power plug can be tricky, especially if the pinout isn't clear. Here are some steps and suggestions to help you out:

1. **Identify Pin Functions:**
- Look for any markings on the back of the unit itself, sometimes manufacturers include pin functions printed right next to the connector or on the PCB.
- If there’s no labeling, you can use a multimeter to check for continuity between pins while the unit is powered off.

2. **Power Requirements:**
- Typically, car stereos like the SONY EXR-22 require a constant 12V power source and a ground connection. You might need to look for:
- **B+ (Battery power):** This pin usually provides constant power to keep the memory alive.
- **ACC (Accessory power):** This pin powers the unit when the ignition is on.
- **Ground:** This pin is essential for the unit to operate.

3. **Finding a Schematic:**
- While you mentioned not finding a schematic online, sometimes forums or sites like DIYAudio or even eBay listings include user manuals or installation guides that might have the information you need.
- You could also check for similar SONY models to see if they share a pinout design.

4. **Using Trial and Error:**
- If you are comfortable with it, you could carefully try connecting power to different pins while monitoring for any signs of power (like lights or sounds). Start with a multimeter to ensure you’re not shorting anything.

5. **Consult the Community:**
- If you're still having trouble, try posting your question on car audio forums or groups. Other users who may have worked with that specific model or similar ones could offer insight.

6. **Professional Help:**
- If you're unsure, it might be worth consulting a professional or a car audio technician who can help you safely connect the unit.

Remember to proceed cautiously, as incorrect connections can damage the unit. If anyone else has insights or additional resources, please chime in!

 

[Deiimos]

Hopefully my reply doesn't get lost with the BOT's. First I’ll add you may damage the stereo if not 100% certain on the wiring, so there is a gamble with this. I’ll add some ideas for finding pins, but be warned. And some are different than others so it may not apply. At any rate, some FREE ideas.

The power pins are usually near each other, so if you find the ground pin, the 12v and ACC are usually close, but not always true that they are next to each other.

Ground pin is generally easy to find, it is tied to the chassis and will be 0.00 ohms DC resistance. Can follow that PC Board trace to see it’s a ground too, but its the only pin directly tied to the radio chassis.

To find the 12v+ battery wire, you need to open it and look for a larger diode near the 15 pin connector. There is usually a reverse polarity diode connected from the ground pin (anode of diode), to the 12v+ BATT pin (cathode / banded end of diode), when you locate that, you know the 12v+ BATT wire. The 12v+ wire also usually runs through an internal choke / coil inductor too near the connector on the board. The 12v pin is usually fairly easy to find like this.

The ACC / ON wire is harder to locate. It is often next to the 12v+ and Ground pins, but not always. If the 12v+ pin and Ground are near each other, the ACC wire is also often next to those, but again, not always true, so do not just assume this.

You can then look at the Audio Amplifier IC chip, lookup the datasheet for said chip, and follow its speaker output pins to the corresponding pins in the 15 pin jack, this is usually 8 wires on head units that are from the 90’s and newer, BUT, vintage stereos can share a common ground and throws off how many wires used for the speakers. It is likely 8 in this case, but be warned it may not be.

So, if you locate the 8 speaker wires, assuming there is 8 for it, the Ground wire, and the 12v+Batt wire, that’s 10 of the 15 pins done, then you are left with the ACC/ON wire, possibly a Dimmer input wire, and maybe even a Remote/Power Antenna wire, which these will be the hard part of it. You might not damage the power antenna output, or the remote output, or Dimmer if you guess wrong, but unless you can trace the circuit these feed into and understand it, you may have to guess on this to hopefully hit the ACC/On wire correctly the first time.

If you do guess the ACC pin correctly, the power antenna and or remote turn on wire(s) will have 12v+ on it when the radio is powered up, and or set to FM / AM mode so these two are easy to find once you have the radio powered on.

I’ve had to do this for a couple different head units over the years and have been able to figure it out, but it is not always easy and hard to explain much further than this, and there is 100% risk of permanently damaging the head unit if you get something wrong.

Again free info you can do what you will with, and one more warning that you may damage the head unit in your experimenting. Good luck with it.

Oh and to add, use a low power fuse when trying to power it up, or current limit through an old tail light bulb from a car. Something like a 500Ma or maybe 1 amp fuse for testing.

 

[ThxOne Premium Member]

https://www.sony.com/electronics/support/in-car-receivers-mobile-tape-players/exr-22/articles/00028631

 

[Deiimos]

https://www.sony.com/electronics/support/in-car-receivers-mobile-tape-players/exr-22/articles/00028631

I could not find anything for the EXR-22 other than the operation manual. I wonder how accurate that is being it says 16 pin, but the radio uses a 15 pin, it also says telephone mute wire, I also wonder if that older radio had a telephone mute, its possible I guess as some older stuff had that. Shouldn’t be too hard to verify it. Even photos of that model are scarce online.

 

[ThxOne Premium Member]

I could not find anything for the EXR-22 other than the operation manual. I wonder how accurate that is being it says 16 pin, but the radio uses a 15 pin, it also says telephone mute wire, I also wonder if that older radio had a telephone mute, its possible I guess as some older stuff had that. Shouldn’t be too hard to verify it. Even photos of that model are scarce online.

I too couldn't find jack on that radio. I do remember radios back in the day having telephone mutes though.