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bmanone
Active Member
I tried contacting Yamaha once and got the run around, but I didn't use the part number above. I try with above yamaha part number. Here's their first response:
Your comment:
Need a replacement IC201(BA3122N) for the left channel. I've tried to locate a replacement part, but I haven't been successful. Please locate me a spare BA3122, or send me an equivalent circuit diagram with component values so I can build a replacement. Thank you for your time.
Hello Barry.
Sadly, due to the age of your Yamaha product, MX-2 parts are no longer available through Yamaha and there are no substitute, universal or replacement item/s available to replace them upon verification with the Japan parts house website.
Please note that MX-2 manuals, schematics and/or specs for parts for this model are no longer available from Yamaha (data no longer housed in our digital or hard copy archives).
You might be able to locate parts, manuals, specs or schematics on the internet. Please see the following example of a typical Google search for these items.
CAUTION: Please be sure to use up-to-date virus protection whenever surfing the web.
Google search criteria (copy and paste into Google search field):
Yamaha MX-2 parts manuals specs schematics
I'm sorry that we are not able to assist you with this request.
Best regards,
Yamaha Support
Yamaha Corporation of America
ref:_00D30F1z._5000Mn0QIU:ref
Hello Barry.
Sadly, due to the age of your Yamaha product, MX-2 parts are no longer available through Yamaha and there are no substitute, universal or replacement item/s available to replace them upon verification with the Japan parts house website.
Please note that MX-2 manuals, schematics and/or specs for parts for this model are no longer available from Yamaha (data no longer housed in our digital or hard copy archives).
You might be able to locate parts, manuals, specs or schematics on the internet. Please see the following example of a typical Google search for these items.
CAUTION: Please be sure to use up-to-date virus protection whenever surfing the web.
Google search criteria (copy and paste into Google search field):
Yamaha MX-2 parts manuals specs schematics
I'm sorry that we are not able to assist you with this request.
Best regards,
Yamaha Support
Yamaha Corporation of America
ref:_00D30F1z._5000Mn0QIU:ref
bmanone
Active Member
I repaired the faults in the V-AMP that caused the problem and the faulty component is the left channel current-amp (several diodes and a few transistors). Everything powers up fine, but the left won't channel wont let me set the idle current. V-AMP right and left outputs play fine through the right channel. I didn't even try the left channel since I couldn't set the idle current. Here's a picture of the V-AMP damage:
Did you replace that burnt fusible resistor?
bmanone
Active Member
It's been a few months, I'll have to check. The picture is from the Main 1 board with the V-AMP section, I know the idle current set fine on the right channel with the main board disconnected, the left channel would not set at all (stayed at zero).
Last edited:
bmanone
Active Member
Avionic, good catch on the resistor. It was R63 (100 ohm), the positive voltage of the signal V0 for the left channel. I'll have to hook everything back up and check for idle current adjustment. Thanks!
Whats the DC voltage at VO?
bmanone
Active Member
I put the good BA3122N chip from the Right channel in the left channel, now the left channel seems to be working. I was able to set the idle current per the service manual. That pretty much narrows the problem down to a bad BA3122N chip, does anyone have one to sell me?
Thanks!
Thanks!
clinic-audio
all on YAMAHA untill 1990
Since you asked me to find one , I never stop to make research
Beobloke
Super Member
Sorry, but how is that response "the run around". It seems to me a polite and helpful reply from a company that is no longer able to support an obsolete component for a piece of equipment that hasn't been made for 20 years! What exactly were you expecting?
bmanone
Active Member
Mark, thanks for the link.
Check your inbox Barry, I replied to your inquiry and got you covered.
FYI, I did a little looking and this chip seems to be prevalent in many of the AX- model receivers as well. Perhaps a wise person would do well to snatch up any parts unit they come across if they can verify its presence.
FYI, I did a little looking and this chip seems to be prevalent in many of the AX- model receivers as well. Perhaps a wise person would do well to snatch up any parts unit they come across if they can verify its presence.
