Jump to content

Jamo D600/RT - 12D Amplifier Power Supply Circuit Repair


Recommended Posts

Ok, so the standby function doesn't work.


Validate that on pin 1 the voltage does indeed change from -05 to 16v if you switch the standby mode.
If this is the case, you must check the transistor Q4 and Q2 + R1 and R2.
The standby principle consists of cutting off the VCC power supply from the IR2153 circuit.

 

Not easy to take measurements with the control board in place!

Link to comment
Share on other sites

  • Replies 53
  • Created
  • Last Reply

Top Posters In This Topic

I don't understand that you can't find faulty components!
I summarize:
-If you bypass the transistor between emitter and collector, the power supply goes into shutdown (voltage on J2 = 0)
-If you force the power off mode on J3 the transistor Q4 does not react.
That's right?
How do you go about testing transistor Q4?

Link to comment
Share on other sites

  • 2 weeks later...

Information and various tests carried out so far have failed to bring this active subwoofer back to life. The main power board seems operational and unfortunately for the time being, no clue on the causes of the failure seems to be looming on the horizon.
Thank you very much to Bricol67 for the time spent

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share


×
×
  • Create New...