General Forum

Re: Penta II problems

camshaft — Wed, 09 Apr 2008 13:16:15 GMT

I was only joking back when I said that, nothing to be sorry about. Asking questions is always far better than pretending to know answers

Re: Penta II problems

Frank Rizzo — Wed, 09 Apr 2008 13:04:36 GMT

Thanks Austin..

And you're right...i'm here alot...until all this stuff gets working....

Sorry for all the questions...

Re: Penta II problems

camshaft — Wed, 09 Apr 2008 12:37:30 GMT

Usually something like two-part epoxy is fine.

Re: Penta II problems

Frank Rizzo — Wed, 09 Apr 2008 12:24:32 GMT

Also...since...we had 2 of the glued coils come off on the crossover board...

What glue / resin...do you use to stick it back on??

Re: Penta II problems

Frank Rizzo — Wed, 09 Apr 2008 12:14:09 GMT

Keith...i really appreciate your help.....!!

I'll keep you informed on how things come out...

Re: Penta II problems

Keith Saunders — Wed, 09 Apr 2008 01:37:59 GMT

Yes, R65 & R66 are 150 K Ohm and are in parallel to give an effective resistance of 75 K Ohm. The reason they have done this is because resistors come in standard values, so the nearest value would be 68K or 82K.

These two resistors have a low tolerance requirements, so you should get at least 5% version. 5% resistors usually have a "gold" band around the resister if it is not written and "silver" for 10%.

Yes R86 is 390 Ohms..

Re: Penta II problems

Keith Saunders — Wed, 09 Apr 2008 01:29:04 GMT

Frank,

D7 is also an IN4148, this is a high speed switching diode made by Philips

R22 is a 680 ohm resistor

Re: Penta II problems

Frank Rizzo — Tue, 08 Apr 2008 15:51:21 GMT

Hi Keith...

On PCB 1........in the service manuals...they have no listing for....some resistors that look suspect.. can anyone tell me if these are correct....below...

R 65, R 66, .....150 k Ohms each yes??

and R 86..... 390 Ohms.. yes??

Re: Penta II problems

Frank Rizzo — Tue, 08 Apr 2008 14:33:26 GMT

Thanks Keith.....he was ready to dis-mount them....he could see the 1N... but with your help....PERFECT !!!!

Also,....Keith....do you know the Diode codes for the D7 and R22.....??? They are not in the pdf file...

gracias..

Re: Penta II problems

Keith Saunders — Tue, 08 Apr 2008 14:31:35 GMT

D5 & D6 are both IN4148 diodes

Just taking the board to a parts shop will not help you.

Re: Penta II problems

Frank Rizzo — Tue, 08 Apr 2008 14:28:19 GMT

Thanks Keith.....(yep..25 volt for the C4..got it...)

Also....they are going out for these now the BC548B's (x2) per speaker...

They don't list the D5 and D6 in the manual....can we just take the board to the parts shop?? Or do you have a reference for these...?? Strange, no??

THanks,

Keith

Re: Penta II problems

Keith Saunders — Tue, 08 Apr 2008 14:06:56 GMT

Frank,

You should not concern yourself about the different part numbers of the boards.

As the capacitor C4 pop'ed it is likely that at least one or more of the following components will have failed:-

TR6 (BC548B) -- D6 could be short circuit -- D5 -- TR5 -- Tests these components

Also it should be noted that C4 is rated at 25 volts

Re: Penta II problems

Frank Rizzo — Tue, 08 Apr 2008 13:48:03 GMT

Hi Martin,

Strange...on the PCB 2....ours says 8001086....

In the book it says it should be...8001165......

Ideas..

Re: Penta II problems

Dillen — Tue, 08 Apr 2008 12:36:47 GMT

Great !

I'm afraid, I can't give you more hints without actually measuring about a bit.

Give the technician a couple of minutes to look at the schematics and understand the circuitry and he will know where to measure and what results to expect.

Martin

Re: Penta II problems

Frank Rizzo — Tue, 08 Apr 2008 12:30:54 GMT

Hi Martin...your input is much, much appreciated....

I understand....i've got an electronics guy now working on it.....(this stuff is all foreign to me).... he's experienced with micro soldering, caps, resistors...etc...but not at all with BnO...

Sorry for my haste....i've just got to translate all this to spanish for them...and it's dicy....

Yes..he told me tha the coil is from the crossover....

He has confidence that with direction he can fix what we need...and he's got all the instruments that a standard TV type repair man would .....have...

Again...the manual is good for me...(but im no electrician..) so i'm not sure even what to translate for him...

OH.....the RESISTORS are new and replaced...(but you can see that they were burnt before)......is what he's telling me...

Ideas for other things that need attention....as we begin to try to fix this thing..??