help reading schematic - TEAC 3300SX-2T reel-to-reel, preamp transport.

Thread Starter

minkey01

Joined Jul 23, 2014
185
Hi.

I have some questions about this schematic for my TEAC 3300SX-2T reel-to-reel. Attached is the very clear, original PDF and a marked up JPG section.

There are circuit path end points with arrows labelled : b, b', c, c', d, d', e, e', f, f', g, g'

What do they connect to? Does b connect to b' and c to c', etc....?

What is the difference and why did they add the ' mark. Prime or apostrophe mark, not sure what they call it in schematics.

Thanks for the help. I have one more question, after this is figured out.
 

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bwilliams60

Joined Nov 18, 2012
1,178
Is there more to this schematic? Generally when I see it (automotive schematics), it means it is continued on other page and you would find that reference point and carry on.
 

DickCappels

Joined Aug 21, 2008
5,879
(Some text removed for clarity)
What do they connect to? Does b connect to b' and c to c', etc....?

What is the difference and why did they add the ' mark. Prime or apostrophe mark, not sure what they call it in schematics.
Yes, that is generally how it is done A to A or A' =the tick mark is just a way of giving that particular point an unique name that corresponds with that of its mate.
 

Thread Starter

minkey01

Joined Jul 23, 2014
185
anyone know what this circled line around the three switch wires is? i highlighted it in yellow. it runs to that horizontal yellow which is ground. is this some kind of shielding?

thanks for the help. see the attached jpg.
 

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debe

Joined Sep 21, 2010
1,141
You got it 3 wires with braided shield to ground/earth/neg.
 

Thread Starter

minkey01

Joined Jul 23, 2014
185
Cool. Thanks!

Last question : Are these highlighted grounds in the attached jpg called chassis grounds? They get wired to the metal chassis? They are audio out jacks, L & R. I don't see any other chassis grounds in the schematic - see the pdf - would this work? Should there be another chassis ground point near the power supply or something?
 

Attachments

Veracohr

Joined Jan 3, 2011
688
Those are circuit common points, halfway between the supplies. They connect to the sleeve on a tip-sleeve connector. You can see an earth ground in the lower right corner of the full schematic.
 

DickCappels

Joined Aug 21, 2008
5,879
I only very rarely use the chassis ground symbol anymore because I rarely use a conductive chassis.

 
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