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Thread Tools |
23rd November 2020, 04:30 PM
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#1 |
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diyAudio Member
Join Date: Aug 2010
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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 .
I’m getting rail and regulated voltages . Any ideas ?
__________________
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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23rd November 2020, 05:01 PM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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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)?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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23rd November 2020, 05:06 PM
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#3 |
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diyAudio Member
Join Date: Aug 2010
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Yes no difference
__________________
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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23rd November 2020, 05:18 PM
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#4 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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What is the DC voltage on all terminals of Q302?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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23rd November 2020, 06:48 PM
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#5 |
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diyAudio Member
Join Date: Aug 2010
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Leg 1:0.00
Leg 2:0.00 Leg 3:-4.61
__________________
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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23rd November 2020, 10:41 PM
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#6 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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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)?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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27th November 2020, 09:07 PM
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#7 |
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diyAudio Member
Join Date: Aug 2010
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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
__________________
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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27th November 2020, 09:39 PM
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#8 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Have you pulled one of the muting transistors to see if audio would pass?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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27th November 2020, 09:53 PM
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#9 |
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diyAudio Member
Join Date: Aug 2010
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Not yet
__________________
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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