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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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Kenwood KR-X1000 receiver shuts down
This unit shuts down 2 seconds after power up. There is no output. I
found Q13, a Sanken 2SD2401 and Q17 also a Sanken 2SB1570, both darlingtons shorted. The small transistor between them, Q1, a 2SC4137 is also shorted. CP1 the dual .22 ohm resistor has one section open and R5 a small 10 ohm resistor shows signs of overheating and is open as well. Mounted on the heatsink are two devices which plug into sockets CN16 and CN17 on the main board. They look like thermal type of devices and read open. One is marked Tokin 495 OHD3-75M and the other is marked Tokin 695 OHD3-105M. Does anyone know what these are? Has anyone worked on this model who might know if I need to check any further or might I be reasonably sure that replacing these parts will restore operation. There is a total of 3 pairs of 2SD2401 and 2SB1570 in this receiver. Might I have any kind of a bias problem mixing a new pair of Q13 and Q17 with the other two pairs in the unit? Fimally does anyone know of a source for the semiconductors? Thanks, Lenny Stein, Barlen Electronics. |
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