Question about Audio Players & Recorders

1 Answer

I have a teac a717 amp which is blowing both 5A fuses.

I have 40v AC at both secondary outputs from transformer and 4 rectifier diodes check out OK. Any suggestions of where to look? It was purchased new in mid 1980's.

Posted by on

  • pbuckley55 Dec 29, 2008

    To clarify some details, my son had the amp at low volume (yes it was low, I was in the room at the time) but he was feeding the output into his electronic drum amplifier. This was 2 days before Christmas. It made a pop sound through the speakers then there was no sound coming through the speakers. I have replaced one fuse and when I switched it on, the fuse glowed brightly before it blew.

    I will check the output transistors tonight.

  • weirdal May 11, 2010

    The first place I'd look is at the output section (transistors or STK type power packs). Since its from the mid 80s, I'd bet it has the STKs. Look for a big black chip the size of a credit card with about 20 pins attached to a piece of aluminum heatsink. There may be one chip or two.

    Any idea why/when the amp stopped working? Did it just die one day when you turned it on or did it blow out in the middle of a Van Halen album cranked up to 11?


×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 24 Answers

Thanks for the clarification. From the fuse behavior and feeding the amp into another amp (generally a no-no) it almost certainly is in the output section. If the amp used output transistors (numbered something like Axxxx/Cxxxx where xxxx=0000-9999) there will be some white three-legged low value (.47 ohm or less) resistors that are probably open. FYI the full part numbers for the transistors would be 2SA/2SC so a part marked C3281 would need a 2SC3281. B+D Enterprises (Google them) has most Japanese semiconductors and they have never sold me a fake transistor.

For more repair tips check out www.audiokarma.org

Posted on Dec 29, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

S-protection


This means that there is a short detected on one of the amp outputs. Try disconnecting the speakers from the back of the unit and power on. If fault still persists then likely you have a bad output ic or FET (transistor). If fault goes away after removing speakers then plug them in one by one to see which is the culprit.

Jan 12, 2017 | Audio Players & Recorders

1 Answer

Teac W-450R tape player manual


Try Googling (teac)(W-450R)(manual) without parens.

Jan 09, 2017 | Teac Audio Players & Recorders

1 Answer

Pioneer media receiver pdpro6u shut off and won't turn on,now there is a blinking blue light


Check and replace the damaged component/s at its audio output stage circuit. An IC short or like that can cause this fault. If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Search the site by type in the "brand name" of your device, in the "Search box at the top right of the Homepage" to get gathered related posts.

Jan 08, 2017 | Pioneer Audio Players & Recorders

1 Answer

Want to use my current speakers with a new surround sound system. Current system is 5.1 channels, rated at 100w per channel @ 8. Ohms. New System is rated 145watts, 5.2 channels at 6 Ohms. Will b ok?


Hi Ronald.
8 Ohm speakers will work just fine as replacements for the
6 ohm speakers. When fitting speakers you need to consider
The power handling capability. The impedance and the frequencies
involved. Power handling is expressed in wattage ie 100W.
Unfortunately this can be expressed in rms, max or peak music. The rms value (root mean square) is the only really relevant figure as this is the continuose handling power at 1 KHz. The impedance
is the resistance that the amp sees but is not a dc resistance and
varies with frequency. The lower the impedance the more power
will be drawn from the amp. In the event of a short circuit across
the speaker the amp will try to deliver infinite power into an infinitly
small load in an infinitesimal amount of time and will self destruct.
Using an 8 Ohm speaker draws less power than a 6 Ohm speaker.
Connecting speakers in parallel; results in the impedance beingreduced. For example two 8 Ohm speakers in parallel will result
in a 4 Ohm impedance load but in series will be 16 Ohms.
Incidentally the the .1 (5.1) is the sub woofer which only has
to handle the bass frequencies, a small percentage of the
amplifiers overall frequency response..
Connect your speakers and then power up the amp last
after double checking there are no shorts on the speaker
cables.
All the very best from Vintie.





Jan 07, 2017 | Audio Players & Recorders

1 Answer

What's the most common problems with a 5000w boss stereo amp


Audio output section fault is the most commom problems to this amp. Gopakumar Gopalan Google

May 31, 2014 | Audio Players & Recorders

2 Answers

Altec Lansing ADA 880 Toroidal Transformer Replacement


Did you solve this? Cause I have the same problem and need some advice...

~Brian
bwalker1978@yahoo.com

Mar 23, 2009 | Altec Lansing ADA 880 Computer Speakers

7 Answers

A/C Adapter Noise and Interference


I just got my radio and home kit today, the hi pitched noise is awful so I looked online and found you.  I finally hooked the car adapter into a wall plug adapter and volla- NO NOISE!  Whew. It's a $9 adapter I got for my ipod car adapter....just has a hole to plug in the car adapter and you plug it into the wall.  
...good luck

Feb 24, 2007 | Delphi Roady XT XM Radio Receiver

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

357 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio Players & Recorders Experts

kakima

Level 3 Expert

98608 Answers

 Grubhead
Grubhead

Level 3 Expert

4678 Answers

The Knight
The Knight

Level 3 Expert

69570 Answers

Are you an Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...