2275 Has Arrived! Recap Underway!

[KutzlerTrans]

Well ground is your chassis, but without a good way to grab your transistor pin you could fry something. You should see the letters EBC on your h804 transistor. Your goal is to connect to the C Leg without touching ANYTHING else.. The center Leg of your transistor is the C Leg. It is Snipped off, but the C leg is connected to the Hold down screw. The screw would be the easiest place to grab on to.
Then grab your Ground pin on your amp board at pin 805.
Just for the hell of it, If you want to check your ground on the amp, You can put your volt meter between your pin 805 and the chassis ground. If you have voltage, you have a bad ground.

I just stumbled on this thread and and i have to say, Mark, You do Excellent Work! Your Pictures are outstanding:thmbsp:.

I like to take the boards out only for the reason that i can Clean them good before i solder, It just makes for a nice job. It also is probably why my FM doesn't work on the unit i just fixed

 

[Pauljuhn]

Well ground is your chassis, but without a good way to grab your transistor pin you could fry something. You should see the letters EBC on your h804 transistor. Your goal is to connect to the C Leg without touching ANYTHING else.. The center Leg of your transistor is the C Leg. It is Snipped off, but the C leg is connected to the Hold down screw. The screw would be the easiest place to grab on to.
Then grab your Ground pin on your amp board at pin 805.
Just for the hell of it, If you want to check your ground on the amp, You can put your volt meter between your pin 805 and the chassis ground. If you have voltage, you have a bad ground.

I just stumbled on this thread and and i have to say, Mark, You do Excellent Work! Your Pictures are outstanding:thmbsp:.

I like to take the boards out only for the reason that i can Clean them good before i solder, It just makes for a nice job. It also is probably why my FM doesn't work on the unit i just fixed

HI,
Excuse me for my repeated question...you reply was not clear to me.
Is J805 is pin 805?
So I should not grab J804 and chasiss to measure the voltage of the H804 ?
I need to know this to identify if the transistor is bad or not.

 

[KutzlerTrans]

To check the voltage on the collector of transistor H804, You must attatch one lead to the ground/pin#805

I said to do it this way, to see what the real voltage is, rather than what it would be checking at the chassis, just in the rare case that your ground pin connector at 805 has a corrupt connection.

Then, you must put your positive lead on the screw that holds the transistor H804 Down. The screw connects to the transistor frame, which in turn connects to the middle pin, that is cut off.

Without looking too close at this whole thread,, i am assuming this is were Randy was pointing you. Let me know if this helps, John

As a Matter of Politeness, This question should not have been asked in the middle of someone else's thread. It would be more Polite to post a new question,.

 

[rBuckner]

I lost track of this thread, sorry. Thanks John for helping out and you're spot on as to how to do it.

It is very much better to start your own post so us old techs remember what we were discussing!

 

[Pauljuhn]

To check the voltage on the collector of transistor H804, You must attatch one lead to the ground/pin#805

I said to do it this way, to see what the real voltage is, rather than what it would be checking at the chassis, just in the rare case that your ground pin connector at 805 has a corrupt connection.

Then, you must put your positive lead on the screw that holds the transistor H804 Down. The screw connects to the transistor frame, which in turn connects to the middle pin, that is cut off.

Without looking too close at this whole thread,, i am assuming this is were Randy was pointing you. Let me know if this helps, John

As a Matter of Politeness, This question should not have been asked in the middle of someone else's thread. It would be more Polite to post a new question,.

Thanks very much for the clear instruction.
(English is my ESL - Excuse)
Appologies for hijacking Mark's thread.
(I was in a hurry to get some help - excuse)

 

[Pauljuhn]

I lost track of this thread, sorry. Thanks John for helping out and you're spot on as to how to do it.

It is very much better to start your own post so us old techs remember what we were discussing!

Thanks for the reply and confirmation.
I will start a new post...