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Error on the Schematic?????

P

PShuff

Active Member
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Error on the Schematic????? Fisher 500-C

Hi guys!

Hope everyone is doing great! :yes:

Could someone please confirm for us if V14 and V15 are reversed on the schematic as far as the marking goes?

We are doing the various random little caps now and our schematic seems to be backwards from what's actually on Daddy's receiver

Everything looke right and is where it's supposed to be, but to make that happen V14 would need to be V15

Hope this makes sense

Thanks a million! :banana:

Phyllis
 
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And exactly what is Daddy's receiver? :scratch2:


EDIT... I've heard that V14 and V15 are mislabeled on the 500c schematic. Is that the unit you are working on?
 
Ooooooooooops!!!!!!!

cubby01 said:
And exactly what is Daddy's receiver? :scratch2:


EDIT... I've heard that V14 and V15 are mislabeled on the 500c schematic. Is that the unit you are working on?
Click to expand...

Uh, duh :nutz:

Yes, the Fisher 500-C

So are they all backwards?

Thank you! :yes:

Phyllis
 
THE SCHEMATIC IS CORRECT. The Tube Layout sheet is Incorrect.
the amplifier section of the schematic on the 500C and 800C go RIGHT to LEFT, as opposed to NORMAL convention which is Left to Right. The Tuner 1/2 goes Left to Right.

Larry
 
larryderouin said:
THE SCHEMATIC IS CORRECT. The Tube Layout sheet is Incorrect.
the amplifier section of the schematic on the 500C and 800C go RIGHT to LEFT, as opposed to NORMAL convention which is Left to Right. The Tuner 1/2 goes Left to Right.

Larry
Click to expand...

Now I am really puzzled :scratch2:

Phyllis
 
PShuff said:
Now I am really puzzled :scratch2:

Phyllis
Click to expand...

They are mislabeled on the schematic only (at least on the 500c). I have a 500c in front of me and the tube layout is correct. V16 and V14 are next to each other with V15 next to the mpx per the tube layout.

The signal goes from input switch to V14 (low filter) to V15 (high filter, tone control amp) to the volume control as shown on the schematic when you correct the tube numbers.
 
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I ran into the same problem. They are swapped on the tube layout, not in the schematic. Here is the way I see it.
 

Attachments

  • Fisher Tube Swap.JPG
    Fisher Tube Swap.JPG
    49 KB · Views: 34
I wasn't trying to be difficult, I just found it easier for me to understand it the way I pictured when I was looking at the underside of my chassis. Nothing more, nothing less.

You have to admit, for someone as inexperienced as me, this confusion can really send your head spinning.
 
AHHHHHHHHHHHHHHHHHHHHHHHH!

Well at least I know SOMETHING'S amiss! :)

What is wired to our tubes, V14 & V15, on our receiver does nor reflect what the schematic says, it is reversed in reality from the notation on the schematic...............the tube LAYOUT picture does reflect the actual lettering on our receiver EXCEPT for the fact that the word description on the tube layout page is wrong, and that doesn't appear on the actual receiver anyway

Thanks guys, thought we were hallucinating there for a minute! :)

Phyllis
 
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PShuff said:
AHHHHHHHHHHHHHHHHHHHHHHHH!

Well at least I know SOMETHING'S amiss! :)

What is wired to our tubes, V14 & V15, on our receiver does nor reflect what the schematic says, it is reversed in reality from the notation on the schematic...............the tube LAYOUT picture does reflect the actual lettering on our receiver EXCEPT for the fact that the word description on the tube layout page is wrong, and that doesn't appear on the actual receiver anyway

Thanks guys, though we were hallucinating there for a minute! :)

Phyllis
Click to expand...

I am still not quite sure we have this straight yet (I am not sure from the above). The schematic is correct, only the tube numbers are reversed. The tube layout is right, including the notations. V14 is the low filter and V15 is the high filter.

Turn your amp over. You will see V14 (pins 1 and 6) is wired to the low filter switch thru 0.02uf ceramic caps. To locate it remember that V14 is adjacent to V16 (which is behind the loudness switch), this is true looking at both top or bottom. V15 is a little more complicated but with some probing you will see it wired to the high filter switch.
 
drewbolce said:
I am still not quite sure we have this straight yet (I am not sure from the above). The schematic is correct, only the tube numbers are reversed. The tube layout is right, including the notations. V14 is the low filter and V15 is the high filter.

Turn your amp over. You will see V14 (pins 1 and 6) is wired to the low filter switch thru 0.02uf ceramic caps. To locate it remember that V14 is adjacent to V16 (which is behind the loudness switch), this is true looking at both top or bottom. V15 is a little more complicated but with some probing you will see it wired to the high filter switch.
Click to expand...

Only the numbers are reversed? That's a pretty big error wouldn't you agree? :) I understand though, the rest of the drawing is right, correct?

But no on the tube locations: V14 & 15 sit side by side right smack in the middle of the chassis right behind the face, making a little triangle shape with V17 right behind them,
V16 is hard right location wise and has a little shield as does it's right channel friend, V17

Phyllis
 
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