BMW Harman Logic7 Amplifier Repair Guide - Part1
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- Опубліковано 29 вер 2024
- BMW Harman Logic7 Amplifier part number 65129218086 (HS7506) repair guide
Link to Datasheets, Technical description, reverse engineered Schematics and high resolution pictures: www.tr3ma.com/D...
I have the same amp in my E64, but both the subwoofers wouldn't work and there was no bass at all. Everything else was workes, just no bass at all. For me (after tremendous blood sweat and tears), it turned out to be the negitive output for both left and right subs from the amp that are at fault. I used the center channels negative wire and replaced it with the subs negative lead, and suddenly I have bass. I did the same for the other side, and still used the center channels negative lead to the amp (but continued using the subs own positive wire). Nutshell: Bypass the negative wires for the subs, and instead tap in to a different speakers negative wire. To prevent any further strain on this already failing amp, i decided to use the positives from the L7 amp for the subs, and the negitve from the center channel to feed into a high level (speaker line, as opposed to RCA) into a second cheap amp to drive the subs. Working nicely so far. Hope this spares someone the pain I had to go through to figure this out. I really did not want to spend £350 for a second hand ebay one (which could well fail after a month). Apperently bmw will sell u a reconditioned L7 amp, but i never investigated that route. I still do not know what exactly failed in the amp to cause the no bass issue, but i know this workaround is going strong for me. This is not a task for someone not handy with a screwdriver
do you repair them for me
Ciao, io ho un amplificatore come questo , da ieri non mi fa il subwoofer destro in resto funziona tutto ..
Mi puoi aiutare 😀😀😀
Lo vuoi riparare tu? Lo hai aperto? Hai fatto delle foto?
Ciao,ho lo stesso amplificatore che non si accende più gentilmente mi daresti un aiuto?l’ho aperto e ad occhio non si vede niente di bruciato
È finito sott’acqua?
How much to send you my amplifier to see if you can fix it.
Are you in europe? If yes, shipment Is not expensive. I can try it, without guarantee of success. You could pay 100€ + shipment+ component price if some expensive component is broken, but you will pay only if I can repair it, otherwise only shipment price. Time could be 1 or 2 months since I can do it during free time