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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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#1
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Power supply schematic for RCA VR676HF
I'm looking for a schematic for an RCA VR676HF. It's dead and won't
power up which is fairly common for this unit as I've read. Does anyone have any first hand experience with this unit? I have an idea it might be in any of the following? Q801, R817,R818,C813,D808,D809,R815 I don't have the part# of the diodes or transistor above so changing them is going to be a problem. A shematic of the power supply would be a great help. T.I.A ampapa, |
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#2
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ampapa:
If you did not do any component testing then ....FIRST......You should check the FUSE.... then certainly you must check the important transistor, resistors, capacitor and diodes that you mentioned..... then test ALL of the electrolytics for high ESR with an ESR meter..... if no ESR meter then just change out all of the electrolytics in the SMPS......not that many .... start with C 09, a 22uf 16V Bi-polar. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "ampapa" wrote in message om... I'm looking for a schematic for an RCA VR676HF. It's dead and won't power up which is fairly common for this unit as I've read. Does anyone have any first hand experience with this unit? I have an idea it might be in any of the following? Q801, R817,R818,C813,D808,D809,R815 I don't have the part# of the diodes or transistor above so changing them is going to be a problem. A shematic of the power supply would be a great help. T.I.A ampapa, |
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#3
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Daniel,
Thanks for the post. Fuse is good, it was the first thing I checked. Are the caps the first to go on these things, from what I've read that's been posted that's were most of the repairs focus. AJM, "Sofie" wrote in message ... ampapa: If you did not do any component testing then ....FIRST......You should check the FUSE.... then certainly you must check the important transistor, resistors, capacitor and diodes that you mentioned..... then test ALL of the electrolytics for high ESR with an ESR meter..... if no ESR meter then just change out all of the electrolytics in the SMPS......not that many .... start with C 09, a 22uf 16V Bi-polar. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "ampapa" wrote in message om... I'm looking for a schematic for an RCA VR676HF. It's dead and won't power up which is fairly common for this unit as I've read. Does anyone have any first hand experience with this unit? I have an idea it might be in any of the following? Q801, R817,R818,C813,D808,D809,R815 I don't have the part# of the diodes or transistor above so changing them is going to be a problem. A shematic of the power supply would be a great help. T.I.A ampapa, |
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#4
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Daniel,
Are you sure your looking at the VR676HF? I don't see C09 - 22uf 16 anywhere? "Sofie" wrote in message ... ampapa: If you did not do any component testing then ....FIRST......You should check the FUSE.... then certainly you must check the important transistor, resistors, capacitor and diodes that you mentioned..... then test ALL of the electrolytics for high ESR with an ESR meter..... if no ESR meter then just change out all of the electrolytics in the SMPS......not that many .... start with C 09, a 22uf 16V Bi-polar. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "ampapa" wrote in message om... I'm looking for a schematic for an RCA VR676HF. It's dead and won't power up which is fairly common for this unit as I've read. Does anyone have any first hand experience with this unit? I have an idea it might be in any of the following? Q801, R817,R818,C813,D808,D809,R815 I don't have the part# of the diodes or transistor above so changing them is going to be a problem. A shematic of the power supply would be a great help. T.I.A ampapa, |
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#5
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Daniel,
Are you sure your looking at the VR676HF? I don't see C09 - 22uf 16 anywhere? "Sofie" wrote in message ... ampapa: If you did not do any component testing then ....FIRST......You should check the FUSE.... then certainly you must check the important transistor, resistors, capacitor and diodes that you mentioned..... then test ALL of the electrolytics for high ESR with an ESR meter..... if no ESR meter then just change out all of the electrolytics in the SMPS......not that many .... start with C 09, a 22uf 16V Bi-polar. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "ampapa" wrote in message om... I'm looking for a schematic for an RCA VR676HF. It's dead and won't power up which is fairly common for this unit as I've read. Does anyone have any first hand experience with this unit? I have an idea it might be in any of the following? Q801, R817,R818,C813,D808,D809,R815 I don't have the part# of the diodes or transistor above so changing them is going to be a problem. A shematic of the power supply would be a great help. T.I.A ampapa, |
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#6
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