The technical service bulletin that covers problem about: Regulator IC’s tend to overheat, eventually causing defective solder joints. Solution: Touch up the solder joints and add a bolt on heatsink to IC Q1 and Q10. Repair procedure: Remove control panel from the speaker and locate the amplifier circuit board. Remove the amplifier circuit board by first undoing the four screws and then gently releasing it from the grip of the three nylon standoffs. Undo any wires if this will help you. Add a small heatsink to !q and Q10, using a lock-nut screw. The heatsink for Q10 can be fitted upside down so it does not touch the Bias adjustment pot next to it. Replace the amplifier board and tighten the four screws, making sure the main transistors Q7 and Q8 are secured to the main heatsink with their clips. Reconnect all wiring.
Tags : amplifier board, amplifier circuit, bias adjustment, regulator ic, lock nut, heatsink, q10, q8, q7, undoing, transistors, screws, q1, joints, bolt
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