Repair time for Marshall MG100HDFX with TDA7293

[Delta362]

In the past year, I had a good interaction with Marshall USA service center out of Buffalo Grove, IL.(800)877-6863

[g1]

Your 100FX uses discrete output transistors. A very simple amplifier and easy to work on in my view.

Would you repair a blown power amp for 1/2 hr. labour? That is the level of simplicity being discussed.

[Jon Snell]

Would you repair a blown power amp for 1/2 hr. labour? That is the level of simplicity being discussed.

Depending on what is actually wrong with it and considering it has only got 12 transistors, 6 of which, may or may not be faulty, plus I keep SMD and power transistors of the type employed in this amplifer, here in stock. Probably a 30 minute job on the bench plus say 10 minutes to disassemble and reassemble. Has it got a shorted output transistor? if it has, why. We are not working on it and are only using educated guesswork as we don't know.

Firstly it was posted as an HDFX totally different model requiring chip replacement and it transpires it is the totally different FX model.

To add fuel to Enzos post, I also have a minimum 1 hour service fee, which means I can make up the balance between difficult and easy jobs. Alot of jobs take much longer, those horrible Chinesium RedSub amps with built in issues, for instance.

The repairs are not the time consuming part, it's the strip down and rebuilding in the SVTs and Randalls that take up the time.

Yes, I would say 1/2 hour, on my bench, is all that is required to repair the FX model.

[x-pro]

Schematics are copyright and I am not at liberty to disclose them.

The man bought an amplifier.
Paid for it.
Paid for the parts installed on the board.
So he also bought the schematic of the unit.
On what grounds can't he have access to the paid schematic? It's his!
In terms of production technology, yes.
This is proprietary information. It is competing information.
Let's say a person has redrawn a schematic from a circuit board. Whose is it? What can he do with it? Can he donate it, sell it, burn it?
I agree with repairing it at a service center. Because a quality repair requires quite a lot of things.