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Troubleshooting the Wurlitzer 200 Series Amplifiers Troubleshooting the Wurlitzer 200 Series Amplifiers This text is directly taken from the Wurlitzer 200 Service Manual notes. Electronic Piano Note #23 April 15th, 1971 200 Series Amplifiers 1. Dead Amplifier (Pilot light does not light) A 2. Blows line fuse B, C, D 3. Blows output transistors J, L, M, N, O, P - See Note #1 4. Distortion D, E, S 5. Low Volume E, S 6. Static E, F, H, I, J, K, T 7. Hiss and noise (can control with volume control) E, F, H, I, J, K, T 8. Hiss & noise (cannot control with volume control) C, I, J, K, U 9. Hum C, E, F 10. Tremelo dead Q, R A. AC line fuse open B. Shorted rectifiers D-2, D-3 C. C-6 D. Shorted output transistors E. Cracks or poor solder joints on PC board F. Poor ground on input cable G. TR-1 (use GE style 11-0778 or 651891 yellow or green) H. R-40, R-36, R-45, R-66 (replace with deposited carbon) I. R-14, R-7, R-8 J. C-9 K. C-18 too close to R-14 L. R-14 (noisy) M. R-10 high in value N. D-4 O. Burr on heat sink puncturing mica washer P. Use one mica under output and driver transistors with heat sink compound on both sides Q. TR-4 R. C-53, C-46, D-5 S. Open or shorted coupling capacitors T. Reed striking pickup U. TR-5, TR-6 http://www.oldschool-sound.com Page 1 Troubleshooting the Wurlitzer 200 Series Amplifiers Note #1. Inspect C, J, L and follow P prior to turning piano on after replacement of output TR'S. ELECTRONIC PIANO 200A Before ordering a new AC power cord for a model 200A, check to see which type of pins is used in the receptacle of your piano. Recently, a new connector has been introduced which features rectangular shaped pins rather than the traditional, round ones. Including the description "round pins" or "square pins" on your parts order will insure the proper type of cord to be sent. Model: 200, 203, 206, 207 Subject: Failure Output Transistors References: Schematic - Piano Amplifier (11-0783) When called upon to change output transistors in the Electronic Piano, check the following items to ensure they are in good functioning order. Check for the following: C-6 1000 mfd. 50 VDC Intermittent C-9 500 mfd. 50 VDC Intermittent R-14 200 mfd. 5 w