Question about Audio Players & Recorders
Current status: Amp goes in protection mode when switched on. On/Off light keeps blinking.
Problem: Left channel gave loud hum, the amp when in protection mode. Gave to service centre for repairs. Worked for few months and same problem came up. This time it burned left channel midrange B&W speaker that needed to be replaced. Service centre was of no help.
Request: I have adequate knowledge of electronics and if yor are able to guide me precisely, I may be able to repair the amp.
Thanks for help
After thorough cleaning of the speaker leads, PC Boards etc, I desoldered all the leads of the main two power transistors of the Left channel that had given problem earlier. Switched on the amp and bingo, it did not go in protection mode which confirmed that the two power transitors were the culprit. After checking the voltages and values of some other vital componenets vis-a-vis remaining left channels, it was confirmed that the circuitry was okay. The power transistors were checked again and found to be okay as well. I then took a chance and resoldered not only these two Left channel power trnasitors but also resoldered all the leads of all the other power transistors as well.
The amp was switched on again and this time also it did not go into protection mode. The amp is working fine. Problem could be either dry solder or short of power transistor leads by stray solder waste strand. There was no need to change any part which was great.
Thanks for help anyway.
Posted on Nov 30, 2008
The numbers of the transistors thay you need to replaced are on the transistor themselfs. Just take out the bad transistors and get the numbers that you need. I ALWAYS replace the output, driver and bias control transistor myself. One thing to keep in mind, if the number on the transistor starts with "A or B or C or D or K" you need to add "2S" in front of that number when you order it. Now that this problem has repeated itself, double check your wire and speaker. They can cause this problem.
Posted on Nov 12, 2008
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.
Posted on Jan 02, 2017
Tips for a great answer:
Jan 23, 2014 | Denon AVR-2312CI
Sep 26, 2011 | Denon AVR-1907 Receiver
Oct 16, 2010 | Denon POA-8300 3-Channel Amplifier
Aug 01, 2010 | Denon AVR-5800 Receiver
May 17, 2008 | Denon AVR-3805 Receiver
May 03, 2008 | Denon Audio Players & Recorders
Feb 13, 2008 | Denon AVR-1804 Receiver
663 people viewed this question
Usually answered in minutes!