Introduction
Here is an inexpensive Guitar Amplifier that came to me for a "rattling on the inside" and " no power" issue. I figured I can take a look at it and see what needs to be done. Straight forward disassembly made it easy and no service manual is needed. Trouble shooting consist of visual as well as some component testing.
Ce dont vous avez besoin
-
-
Here is the Amp in all its miniature glory. total size is 91/2 inches X 9 5/8inches and 6 inches deep. All controls are in the front panel.
-
Remove the 4 Phillips head screws from the back panel.
-
Here are the 4 #6x1" screws
-
-
-
Replace the fuse. Insert transformer power cable to PCB.
-
Since the Amp did not turn on, check the power out on the transformer. It does show 12V DC. Reconnect it and turn the Amp face forward.
-
The Amp uses a 6.3mm input and output jack. Apply a sound source to the input. Still no sound from the Amp, it is time to check a bit deeper.
-
-
-
-
Another odd looking piece is the location of the power Amp IC.
-
The smudge marks of the thermal past revealed that the board was loose and the the IC did not make contact with the heatsink
-
The thread in the heatsink was partially stripped. Use a small jewelers screwdriver to wedge under the screw,while using a #2 Philips screwdriver to remove it.
-
-
-
Reapply a thin coat of thermal paste to the back of the IC. Use a self tapping screw to attach it to the heatsink.
-
Now is also a good time to properly mount the transformer. I used some M3x15mm machine screws.
-
With those repairs made, all that is left is to reassemble the AMP. In my case, this Amp worked after replacing the TDA2030A
-
To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
Annulation : je n'ai pas terminé ce tutoriel.
14 autres ont terminé cette réparation.
Un commentaire
Good Job! Very detailed, narratives good, and photos were excellent for a learning tool. Matt of Martins TV Repair.