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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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Trygon Electronics HR40-750 Manual
I bought one of these as not working and am looking for a scanned copy of the service manual or a schematic so I can troubleshoot it. It seems to not be outputting the full voltage when loaded to about 400mA it only outputs at around 5-8 volts.
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#2
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Trygon Electronics HR40-750 Manual
On 11/13/2014 5:54 PM, nick wrote:
I bought one of these as not working and am looking for a scanned copy of the service manual or a schematic so I can troubleshoot it. It seems to not be outputting the full voltage when loaded to about 400mA it only outputs at around 5-8 volts. I have a scan of a schematic for a HR40-5. It has a 60Hz switching pre-regulator that's a nightmare. If you can't find the right one, I can email this one. |
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#3
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Trygon Electronics HR40-750 Manual
On Thursday, November 13, 2014 10:18:38 PM UTC-5, mike wrote:
On 11/13/2014 5:54 PM, nick wrote: I bought one of these as not working and am looking for a scanned copy of the service manual or a schematic so I can troubleshoot it. It seems to not be outputting the full voltage when loaded to about 400mA it only outputs at around 5-8 volts. I have a scan of a schematic for a HR40-5. It has a 60Hz switching pre-regulator that's a nightmare. If you can't find the right one, I can email this one. I would appreciate it if you could send along the schematic you have. I really don't mind a challange. Hopefully the schematic is similar. I suspected it was a switcher as the transformer looked small for 30-40 Watts. Please send it to . Plan on starting with the caps and then maybe one of the power semiconductors. |
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#4
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Trygon Electronics HR40-750 Manual
On Thursday, November 13, 2014 at 7:18:38 PM UTC-8, mike wrote:
On 11/13/2014 5:54 PM, nick wrote: I bought one of these as not working and am looking for a scanned copy of the service manual or a schematic so I can troubleshoot it. It seems to not be outputting the full voltage when loaded to about 400mA it only outputs at around 5-8 volts. I have a scan of a schematic for a HR40-5. It has a 60Hz switching pre-regulator that's a nightmare. If you can't find the right one, I can email this one. Mike, could you also send me a schematic? I would appreciate it. Thanks, Bruce Baur brucebaur at comcast dot net. |
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