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24212102 Datasheet(PDF) 13 Page - Toshiba Semiconductor |
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24212102 Datasheet(HTML) 13 Page - Toshiba Semiconductor |
13 / 54 page ![]() – 13 – CIRCUIT CHECKS Troubleshooting Guide for Fail Safe Circuit HIGH VOLTAGE CHECK CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on this chassis. Checking should be done following the steps below. 1. Connect an accurate high voltage meter to the second an- ode of the picture tube. 2. Turn on the receiver. Set the BRIGHTNESS and CON- TRAST controls to minimum (zero beam current). 3. High voltage must be measured below (B) kV. Refer to table-1 for high voltage (B). (See SETTING & ADJUSTING DATA on page 14) 4. Vary the BRIGHTNESS control to both extremes to be sure the high voltage does not exceed the limit under any con- ditions. FS CIRCUIT CHECK The Fail Safe (FS) circuit check is indispensable for the final check in servicing. Checking should be done following the steps below. 1. Turn the receiver on and press the RESET button. 2. Temporarily short TP-(R) and TP-(X) with a jumper wire. Raster and sound will disappear. 3. The receiver must remain in this state even after removing the jumper wire. This is the evidence that the FS circuit is functioning properly. 4. To obtain a picture again, temporarily turn the receiver off and allow the FS circuit more than 5 seconds to reset. Then turn the power switch on to produce a normal pic- ture. Check that the set returns to normal operation when pin 12 of Z801(or emitter of Q472) is grounded with jumper wire. Check the voltage across Capacitor C471 is approximately (C) volts. Refer to table –4 for FBT detection voltage (C) . Faulty power circuit or hori- zontal circuit. Defective Fail Safe Circuit (See SETTING & ADJUSTING DATA on page14) YES NO NO YES |
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