Unplug the unit and take out any batteries ( power down the unit completely), Let the unit dry out for a few days or dry with a hair dryer ( low heat ). If the unit still dosn't work I would assume water has damaged the main board ( process board etc. ). If that is infact the sitution, chances are the unit is not worth fixing. Sorry for the bad news. I hope it works out for you.
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Does it have power to it? If so, how much current does it draw, with how much voltage applied? Are any speakers connected to it, and are they good? Does anything light up on the radio? Does it have any other functions, such as CD player, or tape player, and if so, are any of those media present in the unit? If there is voltage applied but zero current, look for a blown fuse, a popped circuit breaker, or other internal total disconnection means in the unit, such as a broken or burned up wire, or broken solder connection.
Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
1.) Possibly the small hairspring in the dust door is not set.
2.) the alignment between the front face plate and the carriage are not meeting up properly.
3.) there is also a pressure switch on either side of the carriage about 1/3rd. of the way in that senses the tape cartridge and triggers the tape loading mechanism. Check multi wire cable or ribbon control cable between front of unit and main circuit board for cracks tears or loose connection.
Without more information on the behavior of the problem I can not be more specific. Good luck with the basic troubleshooting list I have given you and get back with more info if these prove fruitless.
if its a radio shack radio, it means E13 means "Tape Communication Error". It is caused by the microprocessor reading speed pulses from the tape deck either too fast, most other makes mean about the same thing, normally a stuck tape will cause this code to show up, either that or the drive gear that loads and unloads the tape is broken, cracked, or jammed
The radios on older BMWs often have lighting issues where the display is
dim or not functioning. To properly fix this, the radio needs to be
removed. Open the hinged tabs that cover the bolts and use a small
wrench to unbolt the radio. Remove the plastic cover and then pull off
the top cover, usually held on with two screws. Remove the display
circuit board and then the tape or CD player. This should reveal
the main board. Check the bulbs to see if they are getting power. If
they are not, they are burnt out. Replacing them is a little complicated
but possible for a home mechanic
Read more: Troubleshooting a BMW Radio Display ' eHow.comhttp://www.ehow.com/way_5437656_troubleshooting-bmw-radio-display.html#ixzz1CNag2wjc
I fixed this problem in my DVP642 by replacing a capacitor on the main
power board where the power chord hooks in. Take the top cover off
(after unplugging player). You'll be able to locate the bad capacitor
on the circuit board located on the very right. Look for location
marked c316 on the circuit board. A bad capacitor will be bulged up on
top. The capacitor you're looking for will be a black barrel shape with
an aluminum top, this aluminum top will be bulged up or leaking on the
circuit board. Replace this capacitor by desoldering the two leads into
the board and replacing with an identical part you can pick up at Radio
Shack for a couple dollars. My repair for this identical problem was a
success. The blinking light is the tip off for this particular problem
on these Phillips models.
I fixed this problem in my DVP642 by replacing a capacitor on the main power board where the power chord hooks in. Take the top cover off (after unplugging player). You'll be able to locate the bad capacitor on the circuit board located on the very right. Look for location marked c316 on the circuit board. A bad capacitor will be bulged up on top. The capacitor you're looking for will be a black barrel shape with an aluminum top, this aluminum top will be bulged up or leaking on the circuit board. Replace this capacitor by desoldering the two leads into the board and replacing with an identical part you can pick up at Radio Shack for a couple dollars. My repair for this identical problem was a success. The blinking light is the tip off for this particular problem on these Phillips models.
The mechanism would not have reset to allow the door to latch on. it could be a possible failure of the main/dirve belt. you will also have to check if the hinges are broken or if any freign particles have logged in. Removing the deck mechanism and changing thebelt will require a little expert work and so be very careful in removing.
I have a cdf-e75 that had a similar problem, although the red power light was dim for all functions. (the radio, tape and cd)
After opening up the unit and inspecting, I found one of the pins on the printed circuit board for the power had broken away from the solder. (it is a tiny board where the AC connector is soldered to) Seems in my unit there is nothing securing the molded AC connecter to the plastic case except the the printed circuit board it is soldered to-It is a poor design; perhaps your is the same? I suspect over time pushing the AC cord into the back of the player may have broke the connection? Anyway, I soldered the connection and I have never had any additional problems as the unit has worked fine since.
Don't know if this helps, but my suggestion would be to open the unit and inspect the pin connections on the AC printed circuit board to see if any have a loose/broken connection. ( Mine was not noticible with the naked eye as I had to use a magnifying lens and a bright light. Hope this might help.