bricol67 Posted November 13, 2021 Author Share Posted November 13, 2021 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! Quote Link to comment Share on other sites More sharing options...
Yroger Posted November 13, 2021 Share Posted November 13, 2021 (edited) you must check the transistor Q4 and Q2 + R1 and R2. It's good diode test !! 16V ok -0.5v nothing no reaction: 0v ! Edited November 13, 2021 by Yroger Quote Link to comment Share on other sites More sharing options...
bricol67 Posted November 13, 2021 Author Share Posted November 13, 2021 16V ok -0.5v nothing no reaction: 0v! Sorry I do not understand! The voltage changes or it does not change on pin 1, if you toggle the "Power ON / standby" switch Quote Link to comment Share on other sites More sharing options...
Yroger Posted November 13, 2021 Share Posted November 13, 2021 Yes the voltage changes as indicated in previous post 0V to 16V but I use a jumper between pins 1 - 4 and 3 - 4 to change mode! Quote Link to comment Share on other sites More sharing options...
bricol67 Posted November 13, 2021 Author Share Posted November 13, 2021 OK. It would be necessary to measure the voltage indicated by the 2 arrows in red for the 2 modes (power on and standby). Quote Link to comment Share on other sites More sharing options...
Yroger Posted November 13, 2021 Share Posted November 13, 2021 D3: (standby mode): 16v D3 (power on mode): 16v MMBT4403 (standby mode): 15,4v MMBT4403 (power on mode): 15,4v Quote Link to comment Share on other sites More sharing options...
bricol67 Posted November 13, 2021 Author Share Posted November 13, 2021 OK perfect. So your transistor Q4 or one of the resistors R1 / R2 is broken. You can try to bypass Q4 (pin 2 + 3 on the diagram) and the power supply should go on standby. Quote Link to comment Share on other sites More sharing options...
Yroger Posted November 13, 2021 Share Posted November 13, 2021 Ok pourtant avec le multimètre c’était bon ! Je regarde cela demain matin. Bonne soirée. Quote Link to comment Share on other sites More sharing options...
Yroger Posted November 14, 2021 Share Posted November 14, 2021 Ok so Q4 shunted and J3 connector configured in standby mode (pin 1 - 4) here are the voltage measured on connector J2 (power supply only) Quote Link to comment Share on other sites More sharing options...
bricol67 Posted November 14, 2021 Author Share Posted November 14, 2021 Ok, so if you bypass Q4, the power goes to standby. So, either there is one of the broken resistors R1 / R2 / R8 / R9 or the transistor Q4. Quote Link to comment Share on other sites More sharing options...
Yroger Posted November 14, 2021 Share Posted November 14, 2021 I have no good news because all the components are good !! Quote Link to comment Share on other sites More sharing options...
bricol67 Posted November 14, 2021 Author Share Posted November 14, 2021 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? Quote Link to comment Share on other sites More sharing options...
Moderators Travis In Austin Posted November 17, 2021 Moderators Share Posted November 17, 2021 New post created for posts from another thread to be moved here. Quote Link to comment Share on other sites More sharing options...
Yroger Posted November 29, 2021 Share Posted November 29, 2021 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 Quote Link to comment Share on other sites More sharing options...
tsi Posted August 21, 2023 Share Posted August 21, 2023 Hello, My jamo d600 sub is dead, the local repair shop told me that firmware is gone, could someone share the firmare for me ? Thx 1 Quote Link to comment Share on other sites More sharing options...
tsi Posted October 13, 2023 Share Posted October 13, 2023 @bricol67 Could you help me please ? Or PM me I'm from france also 1 Quote Link to comment Share on other sites More sharing options...
Rocache Posted November 8, 2023 Share Posted November 8, 2023 Is there anyone still connected to this topic ? Quote Link to comment Share on other sites More sharing options...
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