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Louie, Technician
Category: Electronic Musical Instruments
Satisfied Customers: 12462
Experience:  25+ yrs. experience in the field and 5+ yrs. online, down to component level.
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Srm 1801, signal in, no output, signal passes thru pass

Customer Question

Srm 1801, signal in, no output, signal passes thru hi pass outputs. This unit works intermittently.
Submitted: 2 years ago.
Category: Electronic Musical Instruments
Expert:  Louie replied 2 years ago.
Hi and welcome back to JustAnswer,
Thank you for the question and your patience. Should you still need assistance for information purposes only...
Initially, proposed preliminary checks (if have not been tried):
• any of the LED (THERMAL, OL, SIGNAL) indicators lit or blinking;
• "...signal passes thru hi pass outputs..." how about the FULL RANGE OUTPUT;
• integrity of the woofer's voice coil while gently pressing/exercising the cone;
• solder condition of the L3 inductor.
Please post back results / observations of the above once tried.
Customer: replied 2 years ago.
I found the defect was a bad solder joint at the incoming PS cable to the power amp board. One of the corner pins was not pushed in all the way so the pin and the trace had a very very small gap all the way around it, causing a intermittent open condition. Bad thing is they had an arrow sticker pointing to the bad connection, like they were supposed to fix it in QC. However it was a bad fix or more likely not fixed at all because maybe it worked when they tested it. I saw no test stamp or QC stamp on the board printed on the board. My troubleshooting method was just a visual inspection of the power amp board. Maybe you can keep this solution for further reference.
Expert:  Louie replied 2 years ago.
Great! Good to hear that the issue has been resolved, congratulations.
Good luck and thank you too for the opportunity to be able to exchange information.
This is not an Info Request.
Customer: replied 2 years ago.
I will defiantly use you in the future! It's a great service and thank you.
Expert:  Louie replied 2 years ago.

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