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Altec amp. Altec Lansing 1594A amplifier is poping fuses and am unable to locate schematic or information on the RCA D40934 transistor. Pat

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4 Suggested Answers

petraman7
  • 1175 Answers

SOURCE: What kind of fuse do

http://www.alteclansing.com/images/user/VS4221_MAN.pdf

Posted on Jan 22, 2009

  • 87 Answers

SOURCE: what would cause my altec lansing 9444b amp to

You may have a short in your wiring, re-trace all of the speaker wires leaving your receiver and going to each of your speakers and be sure the hot and cold wires are not touching anywhere.
Also be sure your volume is not absolutely cranked up.

Posted on Jul 16, 2010

jomabug76
  • 1146 Answers

SOURCE: my sansui integrated amplifier model

check ebay,,and sansui website

Posted on Nov 03, 2010

pctech1
  • 1940 Answers

SOURCE: AC pwr OK Fuse OK.

I am not sure what Altec Lansing product you are working on, but here are some sites with Altec Lansing schematics:

http://www.triodeel.com/altec.htm
http://www.schematics.ca/modules/PDdownloads/viewcat.php?cid=73
http://www.gourmetpa.com/a.html
http://www.altecpro.com/products/vintage/index.htm
http://www.schematicsunlimited.com/?z=altec-lansing
http://www.schematics-free.com/modules/PDdownloads/viewcat.php?cid=19

If you are unsucessful in finding the schematics for this Altec Lansing device, you may need to contact Altec Lansing for the schematics, service manual, or for them to have the device repaired.

Posted on Jun 30, 2011

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1 Answer

I a RCA home reciever How do I get off protection mode?


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier have some problem. there are five amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
For that you need digital multimeter,soledring iron screwdrivers etc
Open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
I have the service manual for the same. if you need the same will sent it to you. For that i need your email id. As it is a large pdf file can't sent through fixya.
ok

Sep 09, 2011 | Audio & Video Receivers

1 Answer

Can i connect altec lansing expressionist classic speakers to a TV? if so, how? THX!


If your TV has a variable audio output, yes.

http://reviews.cnet.com/pc-speakers/altec-lansing-expressionist-classic/4507-3179_7-33427969.html?tag=specs

Plug them in directly to a compatible 3.5 mm output or adapt an RCA audio output to 3.5mm with a connector available at any electronics store like radio Shack.

In your TV audio menu select "variable" for the audio out. Otherwise they'll always be at maximum volume.

May 21, 2011 | Audio & Video Receivers

1 Answer

Speaker blow out with 34vts on output of amplifier .checked transistors & drivers ok.can you help me please


Well, this may take some work, but do you have a schematic for the unnamed mystery amplifier?
If so, trace the voltage back to the op-amp chip that's sitting with V+ on it's output with no input, and you`ve found the problem!
Otherwise, if you have an oscilloscope, with no speakers attached, trace the incoming signal until it turns to a DC voltage or til the signal starts riding on a high or low voltage.

Oh, another thing to check, there's usually a couple high wattage low impedance resistors between the power transistors (unless it's a hybrid chip). If one of those resistors opens up, you can have this issue.

Apr 27, 2011 | Audio & Video Receivers

1 Answer

MY MHC-GNZ7D MUSIC SYSTEM ONLY SHIWING PLEASE WAIT , ITS NOT WORKING PLEASEGIVE ME SUJETION


One possibility is that the power-on speaker protection delay is stuck on. The most common cause of this is a shorted transistor in one of the power amplifier channels. In that case, you will need to replace the speaker driver transistors in that channel. I don't have service information on your particular model; it may use power amplifier modules rather than individual transistors.

The tricky part is identifying the amplifier power and speaker output terminals to test for this problem. To find a shorted output transistor, you need to measure the resistance between the output of each channel and the plus, then the minus power supply connections. There is a relay between the amplifier output and each speaker terminal on the back; this relay is turned off by the speaker protection circuit, so you can't measure from the speaker terminals. If you have a fried transistor, one of the tests will show a resistance of a fraction of an ohm. A good transistor will have a very high resistance or read open. This will be the case whether you have modular amplifiers or discrete transistors.

If you see a blown fuse, that is a strong indication that you do have a fried transistor. Sometimes the speaker protector circuit shuts down fast enough to save the fuse, but not always.

Apr 27, 2011 | Sony Audio & Video Receivers

2 Answers

Yamaha AX 550 amp blows fuse when power switched on,


Generally speaking, an amp protects itself from heat, shorts and overloads.

Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

Jan 17, 2011 | Audio & Video Receivers

1 Answer

What would cause my altec lansing 9444b amp to blow the fuse as soon as it is turned on


You may have a short in your wiring, re-trace all of the speaker wires leaving your receiver and going to each of your speakers and be sure the hot and cold wires are not touching anywhere.
Also be sure your volume is not absolutely cranked up.

Jul 14, 2010 | Audio & Video Receivers

1 Answer

I need drivers for altec lansing acs295 speakers...I bought the speakers years ago and don't have any proof of purchase. When we updated to windows 7, they stopped working. I checked and replaced the...


Speakers don't need drivers, audio chips do. Go to the the site of the manufacturer of the pc, Support and Downloads section, locate, download and install the audio driver from Win 7 section for your pc .

Apr 21, 2010 | Dual Audio & Video Receivers

1 Answer

Hi, I Have a Warfedale pro BX1780sd unit, last night during a performance the mains fuse (8Amp) on the back of the pannel blown. I looked in saide today and found that both the 15 Amp fuses inside the...


check shorted rectifier diode in main power supply,check shorted power transistors,if it is power IC amplifier unsold it put fuse if doesn't blown up the problem is solve.

Sep 07, 2008 | Audio & Video Receivers

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