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Does anyone have the service manual or just the schematics of the 518 boards in the colonnade (333172)? My upper manual is fine,but my lower is barely audible. However, if I switch the connectors labeled 544 between the two, I get the opposite effect.
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You can sometimes buy manuals for later hammonds from organservice of countryside, IL. Not the organservice of marengo IN.
You said in a previous thread that you had trouble with a filter board. I would check the power supply voltages on that filter board at 80% of whatever rating is on the electrolytic caps located on that board. If not change them. Tantalum caps are also usual suspects at this age.
I would then check to see that the DC voltage going in the 2 pins of op amps was equal. Then check op amps that Vout=A(V+-V-). Be especially suspicious of any norton op amps. I would then check transistors and diodes that there was a .6 v drop b-e on transistors or forwards on diodes.
I would then check resistor values as lower than what they say (transistors lower the values). Then I would check source to destination continuity on the component side of visually connected traces, to find bad solder joints.city Hammond H-182 organ (2 ea),A100,10-82 TC, Wurlitzer 4500, Schober Recital Organ, Steinway 40" console , Sohmer 39" pianos, Ensoniq EPS, ; country Hammond H112 -
PM me an email address and I'll scan those pages.
Reflow the solder on the connector pins first.
tdServicing electronic organs since 1969.Comment
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