Question about Pioneer GEX-P910XM Satellite Radio Receiver

2 Answers

Unit will not power up

I have 3 of these units and all of them had the positive and negative power wires swithed around by mistake. The inline fuse had blown, and replaced with new one, checked to see if we were getting power to the plug into the unit from both the red and yellow-red wire and was getting power, checked ground wire ,was ok. My question is ....Is their a fuse or part on the inside of the unit that could have blown? If so where is the part that needs to be replaced? I have opened the case and cannot fined anything that looks out of the ordinary....I have a voltage meter but where do I check?

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  • TallTrucker Mar 05, 2008

    Thank you, Benimur and eagle338... I have looked at the units that I have and one of them their are someparts smoked and the other 2 cannot see anything visibly wrong, I guess I should get a schematic to see what I am looking at. I was thinking about trying to at least get one of them working out of the 3. You are probably right, they are older units and should't waste my time messing with them...PS.. I build radio boxes for truck drivers and used these units in those boxes with am/fm stereo, cb,xm all in a compact unit w/12volt battery.


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Hi TallTrucker,

With the indulgence of eagle338.....

Most if not all 12VDC devices of this nature would have some sort of reverse protection circuitry. This could be a big diode wired/soldered immediately after the power wires coming into the unit.

Additionally, it would generally be divided into several sections.
1. Standard tuner section;
2. Satellite tuner section;
3. Logic circuitry; and
4. Amplifier circuitry.

The amplifier circuitry would be using straight 12 volts and the chance of the amplifier ICs going dead are very high being reverse powered. It may also be worth your while to check/replace the capacitors above 47uF/16V. Other than that, most discrete components in the amp circuit can withstand momentary reverse power.

All logic circuitry (and the digital tuners) would be using +5VDC. This is realized with the use of a regulator from the 12V line. This could either be a 3 terminal, a switching regulator or a zener diode/resistor combo. Both will go dead when reverse powered. There are also capacitors in this section similar to the amp.

There would also normally be a power limiting resistor somewhere along the different B+ line (0.47ohms or something lie that) which would open when components consume high current or as in your case reverse powered. In some instances, there would be inductors as well as resistors.

Since as described above, the component level repair would be relatively extensive, it may be to your advantage to replace the entire board (if ever available) as suggested by eagle338. Additionally, this would require in depth knowledge of electronic circuitry and components, use of a DVM and a soldering iron.

Though I have to say that I beg to differ on the board replacement. More often, the cost of replacement, the downtime and waiting time would not justify any further repairs. Perhaps you should consider replacing the entire unit to save you the trouble.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Posted on Mar 05, 2008

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I am afraid the entire circuit board is screwed this happens because you have shorted the device by interchanging the + and - terminals. You will need to replace it.. It has happened once with me too..

Posted on Mar 04, 2008

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