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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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LA7838 Vertical IC and Mitsubishi CS-3535R
"T o d d P a t t i s t" bravely wrote to "All" (13 Oct 05 16:51:57)
--- on the heady topic of " LA7838 Vertical IC and Mitsubishi CS-3535R" Todd From: T o d d P a t t i s t Todd Xref: core-easynews sci.electronics.repair:345193 Todd "Asimov" Todd wrote: However, as a replier wrote: ring the "yoke", not the fbk. Todd This would require some research on the procedure - no Todd problem, but sometimes these things require some experience Todd to correctly interpret. A ringer is basically a pulse generator the output of which is applied to the coil to be tested through a relatively high impedance. When observed on a scope, testing a good inductance, the resulting waveform should show a number of fading resonnant oscillations. If there is one or more shorted winding in the inductor this robs the magnetic field energy and dampens that natural oscillation. So instead of 4 to 6 oscillations there may be only 1 or 1-1/2 and depending how badly shorted, there may even be none. Shorted turns behave like the secondary of a transformer and rob power from the self inductance. Todd I have to admit I'd love to know if the problem Todd is associated with the yoke or the circuit before the yoke. Well there's always the pincushion correction circuitry. Could be bad diodes there. However, pincushion affects the bowing of the sides and a single kink is more a vertical ramp anomaly. Either the output adds the kink or the vertical oscillator's ramp generation does. Did you check if the signal at the ramp pin of the LA7838 is linear? A*s*i*m*o*v .... Is reactance then illusory? No, it just appears that way... |
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