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Re: KA 8300 Pwr Supply

john@... — Sat, 14 Nov 2009 03:17:45 GMT

Ken, thanks for the reply. Voltage from the output amps are both around 30mv, so it looks like the relay circuit is the issue. I 'm waiting for Rick from

Re: KA 8300 Pwr Supply

Ken — Fri, 13 Nov 2009 18:16:07 GMT

Well, I'm getting there. Replaced the zener and other diodes. No smoke now when I power up, however it seems to remain in protection mode. No initial relay

Re: KA 8300 Pwr Supply

john@... — Fri, 13 Nov 2009 17:57:36 GMT

Well, I'm getting there. Replaced the zener and other diodes. No smoke now when I power up, however it seems to remain in protection mode. No initial relay

Re: KA 8300 Pwr Supply

Ken — Wed, 11 Nov 2009 21:43:02 GMT

"I could only find a 30V 1 watt zener. What`s the impact to the operation should I use the 30V in place of the designed 28v? Should I replace both DZ1 and

Re: KA 8300 Pwr Supply

john@... — Wed, 11 Nov 2009 21:22:01 GMT

Ken, I could only find a 30V 1 watt zener. What`s the impact to the operation should I use the 30V in place of the designed 28v? Should I replace both DZ1 and

Re: KA 8300 Pwr Supply

john@... — Wed, 11 Nov 2009 16:41:47 GMT

Thanks Ken. Yes both D3/D4 tested bad (short) and DZ1 tested short (out of brd). DZ2 tests OK. Not sure what happen to this unit. It was working but it took

Re: KA 8300 Pwr Supply

Ken — Wed, 11 Nov 2009 16:00:40 GMT

"Making progress! Replaced bad diodes D3/4 now I have some resistance to the rails," So D3 was defective also? "Looks like one zener DZ1 is shorted as well."

Re: KA 8300 Pwr Supply

john@... — Wed, 11 Nov 2009 14:08:55 GMT

Making progress! Replaced bad diodes D3/4 now I have some resistance to the rails, but not what it should be (measuring 3K to both). Looks like one zener DZ1

KR7200

Scooter — Wed, 11 Nov 2009 02:10:01 GMT

Hi everyone, Although I have two tweaky systems, which include two Kenwood tuners and a Kenwood KD-500 turntable, I have just purchased a KR-7200 for my

Re: KA 8300 Pwr Supply

john@... — Tue, 10 Nov 2009 13:47:56 GMT

Ken, I appreciate the quick reply and advice. I`ll check with my local electronics shop for some replacement diodes. Thanks again! John

Re: KA 8300 Pwr Supply

TIM SWIERCINSKY — Tue, 10 Nov 2009 13:29:43 GMT

Ken, I wasn't the one looking for the KA 8300 Power Supply info, but appriciate the response. I, personally am looking for KD-75F info. Tim

Re: KA 8300 Pwr Supply

Ken — Tue, 10 Nov 2009 13:21:43 GMT

"D4 across C7/C9 tests shorted. Could this cause the problem (do you have the part number?). I did meter C9 to the groundé+ive again and same readings. I

Fw: [Kenwoodaudio] KA 8300 Pwr Supply

TIM SWIERCINSKY — Tue, 10 Nov 2009 03:11:28 GMT

... From: "john@..." Sent: Mon, November 9, 2009 8:52:41 PM Subject: [Kenwoodaudio] KA 8300 Pwr Supply Ken, I checked the

KA 8300 Pwr Supply

john@... — Tue, 10 Nov 2009 02:52:42 GMT

Ken, I checked the resistors out of board and they check OK. I replaced C9 and C7, and then checked resistance to the ground and positive rail. I get 195K and

Re: KA 8300 Pwr Supply

Ken — Mon, 09 Nov 2009 12:02:50 GMT

"R10 tests shorted in-board, not sure it's purpose" To accurately measure resistance I suggest you unsolder and lift one of the resistor's leads off the board