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Old 23rd November 2020, 04:30 PM   #1
caraudioguy2100 is offline caraudioguy2100
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Default Alpine MRV-F352

Amp powers up and plays audio but I have to have the gains maxed out on all channels in order to hear audio .


Iím getting rail and regulated voltages .


Any ideas ?
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Old 23rd November 2020, 05:01 PM   #2
Perry Babin is offline Perry Babin  United States
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Have you operated all pots and switches through their entire range while listening for audio to see if it every played through (even just for an instant)?
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Old 23rd November 2020, 05:06 PM   #3
caraudioguy2100 is offline caraudioguy2100
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Yes no difference
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Old 23rd November 2020, 05:18 PM   #4
Perry Babin is offline Perry Babin  United States
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What is the DC voltage on all terminals of Q302?
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Old 23rd November 2020, 06:48 PM   #5
caraudioguy2100 is offline caraudioguy2100
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Leg 1:0.00
Leg 2:0.00
Leg 3:-4.61
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Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator
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Old 23rd November 2020, 10:41 PM   #6
Perry Babin is offline Perry Babin  United States
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The audio is low, but is it also perfectly clean?

If you drive a strong signal into it, what is the AC (not DC) voltage on the emitter leg of each of the muting transistors (Q302-Q306)?
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Old 27th November 2020, 09:07 PM   #7
caraudioguy2100 is offline caraudioguy2100
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Yes clean audio but low output

Emitter leg pin 1

0.35 volts on all of them 301,302,303,304,305,306
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Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator
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Old 27th November 2020, 09:39 PM   #8
Perry Babin is offline Perry Babin  United States
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Have you pulled one of the muting transistors to see if audio would pass?
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Old 27th November 2020, 09:53 PM   #9
caraudioguy2100 is offline caraudioguy2100
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Not yet
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