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PC703 [message #27769]

Sat, 06 June 2020 13:25

aeroboy47
Messages: 15
Registered: September 2019

Junior Member

Anyone have a picture of the PC703 PA board showing component locations?

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Re: PC703 [message #27771 is a reply to message #27769]

Sun, 07 June 2020 05:29

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

In as much as Transistors locations, yes I think I do, and I will get back to you tomorrow on that, but in reguards to resistors and caps on the circuit board there's no such thing you just have to follow the schematic.

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Re: PC703 [message #27774 is a reply to message #27769]

Mon, 08 June 2020 08:40

aeroboy47
Messages: 15
Registered: September 2019

Junior Member

The transistor location are what I am looking for. Thank you..

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Re: PC703 [message #27776 is a reply to message #27769]

Tue, 09 June 2020 06:06

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

What parts on the board are you looking for?

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Re: PC703 [message #27777 is a reply to message #27769]

Tue, 09 June 2020 14:47

aeroboy47
Messages: 15
Registered: September 2019

Junior Member

Q1-Q4, Q704-705, and Q708-709.

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Re: PC703 [message #27778 is a reply to message #27769]

Wed, 10 June 2020 05:54

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

Q1 thru 4 are the output Transistors mounted on the underside of the chassis in that recessed strip, the other 4 Transistors you ask about mounted as part of ithe square aluminum heatsinks mounted on the 703 board.

What is the issue the amp is having?

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Re: PC703 [message #27780 is a reply to message #27769]

Wed, 10 June 2020 18:47

aeroboy47
Messages: 15
Registered: September 2019

Junior Member

I can't tell which one is Q1 or Q2. Same for Q704 or Q708 when following circuit traces. I can tell which ones are bad but I would like to know their numbers.
As for the amp, a previous owner or their service representative installed a NO-Blo fuse by soldering in a length of #12 copper wire in parallel with the homemade fuse that they also installed.
If I ever figure out how to post a picture , I will.
Waiting on parts now before I can continue with repairs.

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Re: PC703 [message #27781 is a reply to message #27769]

Thu, 11 June 2020 05:37

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

When you get the chance today text me your email address.

With the dumb way that amp was worked on with those fuses I will be surprised if the round rectifier bridge on the floor of the amp is not bad also, or the power transformer.

To test if the transformer is ok pull the 2 Purple wires off of the bridge , install a small fast blow fuse like 1/2 amp and turn on the amp and the fuse should hold if the transformer is ok.

To work on this or any amp you should spend the 10 buck and take the time to make a light bulb limiter which you can find the plans for on line.

By the way, pictures can not be put up on this site.

Text me 914 420 4356

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