Question about Altec Lansing Multimedia Computer Speakers

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How do you take out the fuse on the back of the subwoofer?

I tried to remove the fuse as it may have blown; but am unable to loosen the fuse cover . I tried using a screwdriver on the top slot; but it didn't loosen the cover.

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  • mgstoll Jul 28, 2008

    This is in reference to the subwoofer of the Altec Lansing ADA745 speaker set.

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1 Answer

Push in as you twist and it should come out.

Posted on Sep 01, 2008

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Fuse blown where I plug my cellphone to charge, where is the fuse located


Probably and inline fuse if the phone holder was fitted after sales. If the car already had a holder (Factory fitted) the fuse will be in the fuse box. Normally in front of the Drivers position under the dash or under the bonnet. If its an inline fuse, you may have to remove any under dash covers and trace the "live" wire from the phone cradle back to its power supply. The fuse is usually in a cylindrical type holder that clips apart or 1 end unscrews.

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If it's continually blowing fuses you have an internal circuit problem, best to take it in for repair at that point.

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There is no power to the subwoofer when its pluged in


hi; try to check the power cord and AC plug if still good condition, if ok.
open the back cover of you wooper using screw driver,search the fuse where AC cord was connected,
if you find the fuse check if it's blown. some wooper has varistor and thermistor for protection,
try to check if it has burn parts, you cen remove it and replace it by soldering iron, you can buy these parts at your local electronic store.
if you cannot do this soldering things, call a repair technician
thanks hope this help you,,,

Sep 05, 2011 | Sony SA-WM250 Subwoofer

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No sound from speakers has a fuse blown


If fuse has been blown means power capacity of the subwoofers exceeded the actual power transmitted.Subwoofers capacity cant hold on to the actual power transmitted.If you replace a new fuse check first if internal circuit was not damaged .When a fuse blown out its an indication that something wrong happened within the circuit.Check first subwoofer line if there was short circuit using a tester.Select OHMS mode and try to check both lines.If no movement it means you have it check to a service technician to fix.

Jun 21, 2011 | Car Audio & Video

1 Answer

Boot light and clock not working


HI, Both these are usually run through the same fuse. Check the fuse box for a blown fuse. Probably a 10 Amp or less. When you remove the fuse cover it shows an index of all the fuses so you can see which one it is. Remove and replace with same rated fuse.

May 12, 2011 | Car Audio & Video

1 Answer

How do you get access to the 1.6a fuse


I found this online. I didn't write it, I didn't try it, but it sure sounds good. First off, I had same problem with an old LifeStyle Series 12 and trying to get in to that case is like trying to get in to Fort Knox... I found these answers on a forum.. I wanted to let you know I didn't not discover them myself but it worked for me.. Also my fuse was bad... I am off to the electrical supply house as soon as I finish typing.. Without further ado:

OK Fellas (and Ladies), here's more detail on the blown fuse fix:
1. You can find the 'plastic swivel tab with notches' by looking for gear teeth in the top rear of the unit. To provide some context, I've placed the subwoofer with the serial number side down, horn is up-front and treble/bass dials on the left. Remove the dial knobs.
2. Now place the unit flat with the horn-side down. Literally use a tennis shoe to spank the plastic cover (on the same side as the gear wheel) in a 45 degree upward motion so the RCA plug holes in the plastic cover are dislodged from the jacks and the unit pops off. One good spank does the job *hee hee*.
3. 2 screws will be visible at the top of the green circuit board. Unscrew these and remove cable ribbons that attach circuit board to other pieces of the unit.
4. The fuse is a cylindrical glass piece, 5mmx20mm. Mine was burnt and coils were missing, an obvious sign of a blown fuse.
5. Don't go to radio shack to find a replacement. They are seriously under-equipped to assist. Go online or to a real electrical supply store to get a 3Amp, 250 Volt 5x20mm slowblow fuse. Don't try to call Bose either because this will inevitably result in more pain. They will try to coax you to order an owner's manual for $10 to get the part number, so you can pay an inflated rate to get the same piece from them. Grrr.
6. I saved $200 - thanks to all contributors on the board. Good work.
7. If this advice helps you, do something nice to help a homeless or mistreated animal. Humans can never be too kind to the rest of the creatures on this planet


Holy ****!!

OK, Bose owners out there listen up and listen good. Here's the real scoop on 1.(getting access to the inside of most bose subwoofers, 2.( repairing said subwoofer.

Follow these steps in removing the cover of your subwoofer. Unscrew the two screws from the cover. (They are on the input/output side of the cover) Remove the two knobs (Bass and treble volume). On the opposite side of the cover, (put those damn shoes back in the closet) there is a lockout tab that needs to be swung out, it moves 90 degrees in a counter-clockwise direction and is located under the center of the cover. A small flat blade screwdriver works great for swinging this tab out and will be necessary for the next step (the screwdriver that is). On the same side (opposite the input/output side) there are two small tabs near the edges of the cover, one on the right and it's counterpart on the left. If you look closely in the gap between the cover and the sub itself, you will see these 3/8" wide tabs near the edges and towards the top of the cover. With the flat blade screwdriver, put the blade between the cover and on the tab and pull down. Then with your hand balled into a fist, gently hit that side of the cover towards the input/output side. the cover will move only slightly but the tab should remain depressed. Do the same procedure on the opposite side of the cover and it will slide about a 1/2 to 3/4" towards the input/output side and can then be removed by pulling it straight up and off of the cabinet.

Yay! If you get this far without incident then you are ready to implement repairs. In the case of the AM15's, normally what happens is a resistor will open up and prevent the triac (turn-on device) from firing. The fuse is on the underside of the PC board and this above mentioned resistor is a 100 ohm, surface mount "chip" resistor on the top side of the PC board. It will not appear to be bad but trust me, if the fuse is good and the sub will not turn on... replace it! You don't have to use a chip resistor since as a consumer you may have a rough time finding one but a 1/8 watt or 1/4 watt resistor you can find at any Radio Shack will work just dandy in this application. Cut the leads short and solder the two cut leads to the pads on the circuit board where the chip resistor is currently sitting. The chip resistor will be black, about 1/4" long, 1/8" wide and have "101" printed on it's surface. On some models they used two 200 ohm resistors in parallel but the result is the same. One 1/4w axial lead resistor will do just fine. Plug it up and give it a try. (Before you replace the cover).

Secondly, if the fuse is blown on a "Lifestyle" Bose subwoofer, contrary to popular belief, it blew for a reason. The speaker outputs and the subwoofer output devices are TDA7294 IC's with TIP142 and TIP147 Motorola transistors used as current supplements to these said output devices. If the fuse is blown and replacing it only results in another blown fuse then chances are good that one or more of these are blown. In some cases it's very easy to tell, the front of these IC's will be blown off and/or you will see burn marks on the board where they are mounted. These devices are located inside the amp portion of the subwoofer. (The black metal heatsink underneath the input/preamp PCB. As a consumer, if the fuse is blown, unless you are familiar with soldering techniques and troubleshooting electronics, leave this to the pro's. It isn't as easy as you might think and you can destroy the PCB in your attempts to repair it.

On Lifestyle 25II and Lifestyle 30II systems there is a problem with the surround portion of the sub system. Inside on the surround PCB there is a 400 MHZ crystal that clocks converted (to digital format) audio signals through the surround processing area of the sub. These crystals fail and the system, although it powers up just fine, has no output at all or it is intermittent

Feb 25, 2011 | Bose Lifestyle 12 System

1 Answer

A few days ago the subwoofer stopped working. Yesterday I turned the system on and it wouldn't work at all. I discovered the fuse had blown. I replaced the fuse, couldn't find a slow blow fuse so had to...


Try removing the wires to the subwoofer and then hook a "aa" battery to it and see if it makes a pop sound..this will tell you if speker is ok...if it is then I think the amplifier sectionj for the sub is what is blowing the fuses...you are probably right..it looks like it's a 1 A fuse...but if it's blowing right away..it may be circuitry related

Jan 04, 2011 | Altec Lansing VS3251 Speaker

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Lexmark T620 Fuser Error


922 fuser error can mean to things #1 the fuse in the low voltage could be blown. #2 the thermal fuse or the lamp are blown in the fuser. looking at the back of the printer the outer rear cover door remove it by opening to a 45 degree angle and lift it off. on the inner rear cover there are to flat head screws loosen these the will not come off the cover. at the top of this cover there is one tab on each side pull in on these and pull the rear covere off this will leave you looking at the fuser. there are to screws holding the fuser in loosen these they will not come off the fuser. from the center of the fuser tray pull straight back. on the front of this fuser you will see 2 white connectors one has a single row of connections this is the ac circuit with a multi tester check resistance from pin 1 to pin 3 if you get no reading then it is the fuser. try this you can find out for sure

May 04, 2009 | Lexmark T620 Laser Printer

1 Answer

Stuck in protection mode


First disconnect the subwoofer wires from the amp, turn the car off and back on...is the amp on? If so your subs are shorting it out, either from a frayed wire, or blown subs.
If it is still in protection mode, check the fuses in the side of the amp.

Mar 21, 2008 | Kenwood KAC-7251 Car Audio Amplifier

2 Answers

The bass speaker doesnt work


OK, Bose owners out there listen up and listen good. Here's the real scoop on 1.(getting access to the inside of most bose subwoofers, 2.( repairing said subwoofer.
 
Follow these steps in removing the cover of your subwoofer. Unscrew the two screws from the cover. (They are on the input/output side of the cover) Remove the two knobs (Bass and treble volume).
 
On the opposite side of the cover, (put those damn shoes back in the closet) there is a lockout tab that needs to be swung out, it moves 90 degrees in a counter-clockwise direction and is located under the center of the cover.
 
A small flat blade screwdriver works great for swinging this tab out and will be necessary for the next step (the screwdriver that is).
 
On the same side (opposite the input/output side) there are two small tabs near the edges of the cover, one on the right and it's counterpart on the left. If you look closely in the gap between the cover and the sub itself, you will see these 3/8" wide tabs near the edges and towards the top of the cover.
 
With the flat blade screwdriver, put the blade between the cover and on the tab and pull down. Then with your hand balled into a fist, gently hit that side of the cover towards the input/output side. the cover will move only slightly but the tab should remain depressed.
 
Do the same procedure on the opposite side of the cover and it will slide about a 1/2 to 3/4" towards the input/output side and can then be removed by pulling it straight up and off of the cabinet.
 
Yay! If you get this far without incident then you are ready to implement repairs. In the case of the AM15's, normally what happens is a resistor will open up and prevent the triac (turn-on device) from firing.
 
The fuse is on the underside of the PC board and this above mentioned resistor is a 100 ohm, surface mount "chip" resistor on the top side of the PC board. It will not appear to be bad but trust me, if the fuse is good and the sub will not turn on... replace it!
 
You don't have to use a chip resistor since as a consumer you may have a rough time finding one but a 1/8 watt or 1/4 watt resistor you can find at any Radio Shack will work just dandy in this application.
 
Cut the leads short and solder the two cut leads to the pads on the circuit board where the chip resistor is currently sitting. The chip resistor will be black, about 1/4" long, 1/8" wide and have "101" printed on it's surface. On some models they used two 200 ohm resistors in parallel but the result is the same. One 1/4w axial lead resistor will do just fine. Plug it up and give it a try. (Before you replace the cover).
 
Secondly, if the fuse is blown on a "Lifestyle" Bose subwoofer, contrary to popular belief, it blew for a reason. The speaker outputs and the subwoofer output devices are TDA7294 IC's with TIP142 and TIP147 Motorola transistors used as current supplements to these said output devices. If the fuse is blown and replacing it only results in another blown fuse then chances are good that one or more of these are blown. In some cases it's very easy to tell, the front of these IC's will be blown off and/or you will see burn marks on the board where they are mounted. These devices are located inside the amp portion of the subwoofer. (The black metal heatsink underneath the input/preamp PCB. As a consumer, if the fuse is blown, unless you are familiar with soldering techniques and troubleshooting electronics, leave this to the pro's. It isn't as easy as you might think and you can destroy the PCB in your attempts to repair it.
 
 This was from a Guru of Bose systems at ecoustics.com: Mark Burgess

Mar 15, 2008 | Bose Acoustimass 15 System

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