Comments on: Marantz Amplifier Repaired

By: Bruno GAULLIER

Bruno GAULLIER — Sun, 08 May 2022 13:30:29 +0000

Hello,
Nice job.
is it possible to have more information about the protection circuit XQ 01.
You said it is a TA 7317 protect speaker circuit.
If you look at the datasheet of the TA 7317, you'll see that on pin N°9 there are 4 diodes in serial which provide around 3,5 V.
On your diagram, pin N°9 is at 8,4 V... this can't be a TA 7317 !!!!
But when you try to find a TA 7317 from Toshiba a lot of them are not corresponding to the data sheet. So what to do ?
Thanks for your blog
Best regards

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By: Yogesh Panchal

Yogesh Panchal — Sat, 06 Apr 2019 07:53:49 +0000

excellent! way to revive old equipment.

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By: Humberto

Humberto — Fri, 29 Mar 2019 17:56:11 +0000

Undoubtly you are a Master. Congrats.

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By: beh

beh — Fri, 22 Mar 2019 03:02:35 +0000

Thia amply is as old as 20 years actually the electronic machines older than 5 years are electrolyte caps suspect problems i may suggest to replace all caps in the machines even before any trouble shooting
PARASURAMAN well done and congratulations.

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By: Robert Calk Jr.

Robert Calk Jr. — Thu, 21 Mar 2019 23:25:55 +0000

Good job, Parasuraman. I wonder if the adhesive ate up the e-cap leads?

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By: Albert van Bemmelen

Albert van Bemmelen — Thu, 21 Mar 2019 15:23:43 +0000

Good job Parasuraman! The amplifier is now maybe even better than it was ever before!
They probably should have given you the service manual for free since it is an already older no longer produced device to solve it. Strange that they marked the 9 pins TA7317P as being the Qx01 chip in the circuit.

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