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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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NO HV
Have this KDS - Mod. KD1731T with no HV. - Green LED in front of panel lights
up when on and dissapears when off. - measuring votages, I get 137.7V on the collector of the HOT when unit is off and voltage drops to abt 120V when I turned it "on" but no action on the HV. Resoldered all connections around FBT but no change in symptom. Any ideas of what could be wrong will be appreciated. TIA Alphie |
#2
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NO HV
Loss of drive to the horiz section from the signal generating device.
Defective component or improper supply in the horiz driver circuit. Best bet will be to scope the signal to the horiz driver and trace it back from there, of coarse having a good schematic will probably be required. May even be a cracked circuit trace or poor soldering in other areas. "L1ange bleu" wrote in message ... Have this KDS - Mod. KD1731T with no HV. - Green LED in front of panel lights up when on and dissapears when off. - measuring votages, I get 137.7V on the collector of the HOT when unit is off and voltage drops to abt 120V when I turned it "on" but no action on the HV. Resoldered all connections around FBT but no change in symptom. Any ideas of what could be wrong will be appreciated. TIA Alphie |
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