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Old 9th March 2010, 02:01 PM   #1
elec972 is offline elec972  Martinique
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Default Alpine mrd-m300

Hello
i'm looking for schematics Alpine MRD-M300
power supply probleme
Thanks
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Old 9th March 2010, 04:25 PM   #2
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What is the problem with the supply?

PacParts sells the schematic along with other sites. They sell a complete CD of all the models for Alpine. I didn't want to pay price though.
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Old 9th March 2010, 07:56 PM   #3
elec972 is offline elec972  Martinique
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I work with MRD-M301 schematics not exactly the same
No pulse pin 9 and 10 from UPC494GS , i have 0v pin 4 , if this pin is 5V psu works fine
but without good schematics , it's hard to find .
Thanks
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Old 9th March 2010, 08:48 PM   #4
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Is the 5V ref on pins 13 and 14?
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Old 9th March 2010, 08:53 PM   #5
elec972 is offline elec972  Martinique
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yes 5V on pins 13 ,14 and 15
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Old 10th March 2010, 03:09 AM   #6
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Can you post the mrd-m301 schematic or send it my way?
brandes.cm@gmail.com
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Old 10th March 2010, 11:28 AM   #7
elec972 is offline elec972  Martinique
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Ok
i send schematics
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Old 10th March 2010, 12:13 PM   #8
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Q561 is the control transistor for pin 4 of the 494. What does the signal do on the base leg? That is driven directly from u501 pin 19. You can short that transistor and the amp should turn on. Leave it on for a few seconds and feel for warm parts.

You may have another issue causing that pin to stay high.
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Old 10th March 2010, 01:03 PM   #9
elec972 is offline elec972  Martinique
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I have not Q561 on MRD-M300 but Q563, Q562 not exactly the same schematics as MRD-M301
that's why i'm looking for schematics!!
Thanks
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Old 10th March 2010, 01:48 PM   #10
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See attached pic, in red box. Off the upper left hand corner of the 494 chip.
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File Type: jpg mrdm300 (3).jpg (913.2 KB, 44 views)
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