Saltar al contenido principal

Repairs guides for the Fender Frontman 15r, a small, 15 watt, practice guitar amplifier. Model number: 022-1500-000.

Preguntas 9 Ver todo

Replacing the U4 IC TDA2050

I've narrowed down my problem to a possible burnt IC that keeps blowing the fuse. I was able to remove the panel with the circuit board but in order to replace the IC, I need to get access to the bottom of the board which is held in place by a brace.

How would you go by removing the main brace to get underneath the board so theres space enough to un-solder the old IC (sitting right behind the brace) and replace it?

Contesta esta pregunta Yo también tengo este problema

Es esta una buena pregunta?

Calificación 0
Agregar un comentario

Baterías para ordenadores portátiles

Un pequeño arreglo para un gran resultado.

Comprar Ahora

Baterías para ordenadores portátiles

Un pequeño arreglo para un gran resultado.

Comprar Ahora

2 Respuestas

fossil, this is how to dismantle it "Remove the screws from the back cover. Remove the cover. The power wires are plugged in place on mine. Remember where they go, one black, one white and one green. They MUST go back where they came from. If the green is soldered in place, and some are, unsolder it for removal. Disconnect the reverb and the speaker wires making sure you note the location of these wires. Polarity is important. On the sides of the amp and forward remove the 2 screws that are about 8 inches up. One on each side and probably black in colour. Now from the inside, there are 2 screws that hold the speaker wooden frame to the lower part of the amp. Remove these. Now, from the back push the speaker and wooden frame towards the front and it will pivot forward top first. Lift the speaker out of the front of the amp. Now, remover the screws holding the handle in place. These hold the amp chassis in place so keep a hand under the chassis to catch it. Once free remove it through the front opening. Now we move to the chassis. Remove all of the knobs and nuts under the knobs holding the switches to the chassis. Remove the screw at the AUX input. Remove the nuts at the input and headphones jack. Unplug the 4 wires at the power switch and make sure that you mark where they go. This is important. They must return to the same pins when reinstalled. Unplug the yellow and red wires and plug from the transformer at the chassis. There may be a tywrap on the speaker wires to this transformer wiring. Clip it. Now, flip the chassis over and remove the 2 screws that hold the heat sink/chassis mount to the main chassis frame. The PCB board should now be free of the metal chassis. Unsolder the headphone jack. Looks like 8 or 9 solder joints. Go slowly and move the jack a little at a time until it is totally removed. Now reinstall the new jack and reassemble in reverse order." source. Also, remember that there was an updated service manual due to the fact that some of the IC's were no longer in production. Hope that is not the one you will need. Hope this helps, good luck.

Fue útil esta respuesta?

Calificación 0

Comentarios:

Thanks ! I got that down to the board, now I'm just waiting for those IC's to show up so I can start the soldering... In the meantime though, is there anyway to bypass the existing one to see if the amp will turn on without blowing a fuse?

por

which IC in particular is "on the fritz" on your amp?

por

It's the IC marked U4 on the board, (TDA2050). I took it out and plugged the power back in and no more fuse issues so far.. I'm hoping I didn't burn the board taking it out but I'll have to wait and see when the new chips arrive. I'll keep you posted.

por

Agregar un comentario

This Is A VERY Easy Fix. That Brace You Speak Of Is Also The Heat Sink. 1st.. Remove The Two Screws From The Chassis. Leave The Two One The Circuit Board. 2nd. Pop Off The Two Wires Next To The Fuse (It Doesn't Matter If You Mix Them Up On Reassembly). 3rd. Pull Off ALL The Pot. Knobs. & Remove The Nuts. 4th. Remove The Two1/4" Jack Nuts. 5th. remove The Philips Screw From The Aux. In. The Chassis Will Now Slide Out Enough For Servicing. Reverse Procedures To Re Assemble.

Fue útil esta respuesta?

Calificación 0

Comentarios:

good job....

por

Oddly Enough, I Know There Is A Third Variation Of The Fender Frontman 15. I've Seen Fender Frontman With Alpha (With Nuts) Pots And Fender Frontman With Snap-in Pots With Knurled Shafts, & Snap-in With D-Shafts.

On SOME Fender Frontman Amplifiers, The Input Jack Has A Flimsy Protection Cover Over The Jack.

por

Agregar un comentario

Añadir tu respuesta

fossil estará eternamente agradecido.
Ver Estadísticas:

Ultimas 24 Horas: 1

Últimos 7 Días: 7

Últimos 30 Días: 24

Todo El Tiempo: 3,888