I'm trying to repair the subwoofer (MF7010) of S750 speaker.
I managed to replaced some obviously failed parts on AMP board 2, after that, when I use diode switch of multimeter to measure two pins, something interested happened.
The power input of AMP board has five pins:
[+24V] [-24V] [GND] [70V+] [70V-]
So, I'm confusing now.
Does it means there're still issues on this AMP board?
Or, it's just the smaller resistance caused the reading value occurred when using diode switch of multimeter?
I managed to replaced some obviously failed parts on AMP board 2, after that, when I use diode switch of multimeter to measure two pins, something interested happened.
The power input of AMP board has five pins:
[+24V] [-24V] [GND] [70V+] [70V-]
- When I put RED probe on [GND], BLACK probe on [-24V], there's a reading value (1.98x or 1.99x).
- If I measure same pins on another AMP board of another speaker, there's no reading value (actually, the multimeter displayed '1' which indicated it's out of scope)
- If I use resistor switch (20K) of multimeter to measure same pins on both AMP boards, the reading values are very closed, one is 10.7xK(the failed one), another is 10.91K (the good one)
So, I'm confusing now.
Does it means there're still issues on this AMP board?
Or, it's just the smaller resistance caused the reading value occurred when using diode switch of multimeter?
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