My Marine Clarion model M455A after playing for half to 3/4 an hour it switches off. I check the fuses they are alright,then I svitch the unit on and it plays for some time then it Switches off. Can You Help

Loose antenna wire

One way to find out... Its not going to hurt anything.

There may be a fuse link or diode inside of the unit. You would have to dissasemble to locate. Depending on your skills, you can do this yourself. It would probably be expensive to have a shope repair it.

Go to the CLARION website and look for CUSTOMER SERVICE. You can either call or e-mail a description of your dilemma with the radio. The company stands behind their products. If it is still under warranty you may find it easier to first go to the store where it was purchased. They will give you a new unit if it is within the 30-day purchase date or at least offer to send it to Clarion for repair. Make sure you get a RETURN AUTHORIZATION number from the company. As far as being a "marine" radio, it is still an electrical product in a wet environment. The radio chassis is protected with a stainless plate to shield the circuitry. There is gasketing to prevent moisture from entering. Even the so-called waterproof handheld vhf radios claiming submersible protection have a limit to how long it can remain submerged before it loses watertight integrity. If saltwater invades to circuitry, immediately disconnect the power source (never try to turn it on if it IS wet.) and remove the unit so that you can RINSE as soon as possible the exposed electrical connections with FRESH WATER to remove the salt BEFORE it drys and becomes encrusted. Do Not allow the salt water to dry and become encrusted and the damage is done. Salt destroys electrical connections; eats 'em up! THEN blow-dry on a low setting and set it aside to complete the drying out process. Some wags suggest placing it in the oven on alow setting. I DON'T. Good Luck.

buy a new one

Sorry I can't help you...but wanted to let you know you are not alone. I bought a 2007 Chap last March and have the same problem. I've covered all the basic/common sense troubleshooting but can't get them to function. My frustration is that the displays work so the clock/radio station is displayed but nothing in regards to controlling the deck.

After spending an hour, here is how you do it. With the radio playing, press and hold the BAND button, until the word MANUAL displays in the bottom left. Then press and hold BAND, plus DISP (4). The radio will then go into Clock mode. You can change the hours by pressing the left scan, and the minutes by pressing the right scan. When finished, press the BAND button. To exit MANUAL mode, press and hold the BAND button.

Mine just did the exact same thing this weekend. Have you had any luck finding a solution. I've checked all the wiring and no fuses that i can find.

you can get the instruction book in the following websites.
www.bizrate.com/marineelectronics/clarion-m275-marine.../compareprices.html
www.amazon.com/Clarion-M275-Marine.../B000PHFVKW
www.crutchfield.com/ISEO...020M275/Clarion-M275.html

Here is the product page:
http://www.clarion.com/us/en/products/2006/marine/source_units/M455A/us-en-product-pf_1151544055054.html

And here is the manual:
http://www.clarion.com/us/en/MungoBlobs/797/154/M455A_ENG.PDF

In page 33 you'll find the wiring chart.