kenwood KAC-628 car amp problem

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wahee

Member - Posts: 6

Joined: September 21, 2004

Location: United Kingdom

Posted: September 21, 2004 at 8:13 AM / IP Logged

hi everyone

would anyone have a .pdf or scan of the circuit for this amp, or would know the type of zener diodes used in the power supply.

any help appreciated

kgerry

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This member consistently provides reliable information

Joined: February 07, 2004

Location: Saskatchewan, Canada

Posted: September 21, 2004 at 11:44 AM / IP Logged

post the diode designation... D601, etc.

Kevin Gerry

Certified Electronics Technician

MECP First Class Installer

Owner/Installer

Classic Car Audio

since 1979

wahee

Member - Posts: 6

Joined: September 21, 2004

Location: United Kingdom

Posted: September 22, 2004 at 7:57 AM / IP Logged

its D7

I think it might be a 7.5v but not sure.

The transistor Q17 is getting very hot

kgerry

Platinum - Posts: 3,455

Joined: February 07, 2004

Location: Saskatchewan, Canada

Posted: September 22, 2004 at 2:42 PM / IP Logged

yes it is... it's an RD7.5JS Zener you've probably got a bum power FET, replace both Q17 and Q18 as a matched pair

Kevin Gerry

Certified Electronics Technician

MECP First Class Installer

Owner/Installer

Classic Car Audio

since 1979

wahee

Member - Posts: 6

Joined: September 21, 2004

Location: United Kingdom

Posted: September 22, 2004 at 5:28 PM / IP Logged

thanks for that. I have ordered a pair of Toshiba equivilents which should hopefully do the trick.

heavilymedicate

Silver - Posts: 328

Joined: August 05, 2004

Location: Texas, United States

Posted: September 22, 2004 at 6:10 PM / IP Logged

You guys are more educated then I. Some day, I hope to be as smart as the two of you. I sh*t you not.

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stevdart

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: September 22, 2004 at 6:39 PM / IP Logged

I know what you're saying, heavily...I haven't advanced yet to the realm of zener diodes yet either. But I'm getting this stuff a little at a time. I never miss a post that kgerry writes...I put him in a class with professors. Like DYohn and Rob at his Forbidden empire, he is one who provides certain and unquestionable advice (and it's free!).

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

kgerry

Platinum - Posts: 3,455

Joined: February 07, 2004

Location: Saskatchewan, Canada

Posted: September 23, 2004 at 4:58 PM / IP Logged

lol where do i mail the cheque???

BTW wahee, the originals are made by International Rectifier and are only about 5 bucks each... why are you subbing in some generic Toshiba part?

Kevin Gerry

Certified Electronics Technician

MECP First Class Installer

Owner/Installer

Classic Car Audio

since 1979

wahee

Member - Posts: 6

Joined: September 21, 2004

Location: United Kingdom

Posted: September 23, 2004 at 5:23 PM / IP Logged

hi - I couldnt get the IRf part frpm my supplier - RS components - they had everything but . kenwood KAC-628 car amp problem -- posted image.

I actually got some Toshiba 2SK2232 - It was cross referenced for the IRF part. I havnt got around to fitting the parts yet as im fixing a couple of old philips cd104 cd players at the moment, but I should hopefully get the Kenwood amp fixed by Saturday (as long as theres no more hidden gremlins)

thanks for all your help

wahee

Member - Posts: 6

Joined: September 21, 2004

Location: United Kingdom

Posted: September 24, 2004 at 1:53 PM / IP Logged

kgerry, could you tell me if D34 is the same value of diode. I think im gonna have to get the IRF originals as the toshiba are not the same after all

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