KCJ9091
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« Reply #15 on: August 15, 2012, 06:52:12 AM » |
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If it was header pins sticking up from the board I would wire wrap before I soldered.
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N4NYY
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« Reply #16 on: August 15, 2012, 07:07:37 AM » |
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If it was header pins sticking up from the board I would wire wrap before I soldered.
A lot more people know how to solder more than wire wrap. |
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KA4POL
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« Reply #17 on: August 15, 2012, 08:21:52 AM » |
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I would solder. That might be his easiest bet.
Might, indeed. |
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W4JST
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« Reply #18 on: September 05, 2012, 06:42:12 AM » |
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I replaced the ribbon cable and the radio still won't power on. Where else should I look? Thanks.
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KA4POL
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« Reply #19 on: September 05, 2012, 08:04:15 AM » |
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Are the PCBs grounded ok? If you measure plus voltage against chassis this may be misleading when a board does not have ground connected.
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W4JST
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« Reply #20 on: November 22, 2012, 05:38:36 PM » |
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KA4POL,
Where is pin 17 at CN301? I see CN301 but don't know which pin is which.
Any other ideas as to why this thing won't power on?
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KA4POL
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« Reply #21 on: November 22, 2012, 10:04:04 PM » |
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Pin 1 of CN301 goes through R432, 100 Ohm, and C408, 100pF, to ground. I'd trace it from there.
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W4JST
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« Reply #22 on: November 23, 2012, 04:19:58 PM » |
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I don't see R432 or C408.
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KA4POL
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« Reply #23 on: November 23, 2012, 10:09:28 PM » |
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Ok, another way: pin 16 goes directly to ground. This would mean it is the fifth pin from the pin 20 end of CN301. This is on the main UHF pcb.
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W4JST
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« Reply #24 on: November 24, 2012, 10:51:15 AM » |
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Thank you.
Pin 16 goes to ground and pin 17 has 13.8 volts at it with the radio connected to power. Still the radio will not power on.
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KA4POL
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« Reply #25 on: November 24, 2012, 10:03:10 PM » |
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Is there a power on reset procedure?
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W4JST
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« Reply #26 on: November 26, 2012, 05:18:16 PM » |
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It looks like the manual says hold "F" and power on to reset all transceiver data.
I just tried that, nothing happened. There is no sign of life whatsoever.
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K9MHZ
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« Reply #27 on: November 26, 2012, 06:01:33 PM » |
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JST....
I don't have one of those radios, so consider the source. Anyway, we had a guy locally whose Kenwood TK-981 (902 MHz) was behaving the exact same way suddenly. A local ham works in a Kenwood biz band radio shop, and he found that the power on/off switching transistor went bad. They replaced it, and it works great.
FWIW....good luck, that has to be frustrating.
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W4JST
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« Reply #28 on: November 26, 2012, 06:57:12 PM » |
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Thanks for the idea K9MHZ.
Maybe KA4POL knows where the switching transistor is on the DR610?
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KA4POL
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« Reply #29 on: November 26, 2012, 10:23:27 PM » |
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The power switch SW501 goes directly to the CPU IC501. The regulator IC 503 delivers a reset signal to the same CPU. Now with these pulses it gets really tricky. I am afraid now that even the CPU might be the problem. Can you see if the 5V is present at the output of IC503 (pin 5, seen from marked side the rightmost one) and if the power switch when closed has also the 5V at its output?
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