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Roc pro 700 fuse always breaks

Hello the fuse is always breaking i replaced the darlington power transistors( motorla)tip 142 and tip 147 (where shorted)by tip142 and 147(italian made )the amp worked for 10 min (the transistors where to hot )and shorted again ,then i replaced them with
( St )tip 35cand tip 36c this time the amp worked for 15 min can someone help with this? i checked all the resistors can u help me plz by giving me the exact equivalent transistor for the tip 142 and 143? what do you think the problem is?

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Tip

Repair lavalier microphone


Lavalier microphone usually breaks by the cable, near the clip, 'cause talents mess with it during shots. here you will understand how to fix it.

Don't know what is the brand of this mic, but if have one that is similar, quite shure it will be fixed in the same way.

Detach mic from body pack or by phantom power injector.
write_tip-jzzyfeyvjm4ftyhthvyxbacz-3-0.jpgCry for the mess your collegues make with mic cables ...

Detect the problem ... in this case is clear u have to cut a piece of cable and resolder the capsule
write_tip-jzzyfeyvjm4ftyhthvyxbacz-3-1.jpg

with two pliers, gently twist the two pieces of the capsule to unscew it.
write_tip-jzzyfeyvjm4ftyhthvyxbacz-3-3.jpg

Now you have access to the mic PCB, solder points etc.
write_tip-jzzyfeyvjm4ftyhthvyxbacz-3-6.jpgWhen you will cut the damaged part of the cable remember to re-set screen and vibration pad in the same order like it's now (use that hoto as reference).

Take note of where shield and signal are soldered (mic do not work if reverse biased or works very bad ... and could be damaged)write_tip-jzzyfeyvjm4ftyhthvyxbacz-3-10.jpg

Desolder the cable and cut the damaged part.
write_tip-jzzyfeyvjm4ftyhthvyxbacz-3-15.jpg

Strip the cable tip (and recycle the plastic cover to insulate ground shield.
Pre-solder signal and shield tips.
write_tip-jzzyfeyvjm4ftyhthvyxbacz-3-21.jpgSet on the cable bumper and screen NOW (if you removed them) :D

Carefull position cable in correct position (remember the polarity you noted before).
pre-soldered tips touching the right pcb position.
Gently position soldering iron on the tips. Soldering on both sides (cable tip and pcb) will fuse and make the electric contacts.
write_tip-jzzyfeyvjm4ftyhthvyxbacz-3-28.jpg

It's time to re-assemble the whole thing.
Make a knot on the cable or use a cable tie to add mechanical strenght to the cable :D
write_tip-jzzyfeyvjm4ftyhthvyxbacz-3-36.jpg



write_tip-jzzyfeyvjm4ftyhthvyxbacz-3-45.jpg
Now your mic is (quite) new. Connect body pack or the phontom power injector and check it on your equipment.

Happy fixing :D

on May 04, 2016 | Audio Players & Recorders

1 Answer

Repair cable on shure wireless headset mic


If you unplug the mic, does the crackling stop? It so, replace the mic.

Feb 03, 2012 | Shure THD Wireless Headset Microphone...

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I have fender passport pd-250 the protect light on and the power light geos off


One or more of the power transistors are shorted. There are eight transistors in the amplifier section - 2 high & 2 low for each channel. This unit is difficult to open up to work on.

Unplug unit and check speakers with a multimeter to make sure they are not shorted.
Take off front panel (8 screws).
Remove power supply shield with yellow tape (2 screws).
Remove 2 screws holding top of power supply, loosen bottom screws.
Replace front and hold in place with a couple screws.
Turn unit around.
Remove screws holding heatsink (6 screws)
Open rear storage door.
Carefully pull amp section out, being careful of tightly routed wires. Note any connectors you disconnect.
The amplifier is the board on the top, the power supply is in the silver box.
Push the power supply forward and loose the black screws holding the amplifier board bracket closest to the heatsink.
Loosen the top brass screws holding bracket to heatsink and remove the bottom screws.
Remove all eight of the screws holding the transistor brackets & transistors to the heatsink. Look and take careful note of how the plastic insulators weave through the transistors. If you get this wrong, you can short out the whole amplifier when you turn it on.
Slide the amplifier board down and out where you can get to the bottom. Note the wires and connectors going to the small protect board over the amplifier.
Check the transistors with a multimeter to find the shorted ones. Remove and replace bad transistors. These are connected in pairs.
Reassemble in reverse. Be careful of reconnecting wires and insulators. Don't test until the amplifier PCB is back in place and you're sure of all wires. If the PCB is touching the power supply, you'll short it out.

Good luck, I told you this wouldn't be easy!

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1 Answer

I have the passport p-250 i left it on over night and when you turn it on the red comes on that said protect thanks jimmy


One or more of the power transistors are shorted. There are eight transistors in the amplifier section - 2 high & 2 low for each channel. This unit is difficult to open up to work on.

Unplug unit and check speakers with a multimeter to make sure they are not shorted.
Take off front panel (8 screws).
Remove power supply shield with yellow tape (2 screws).
Remove 2 screws holding top of power supply, loosen bottom screws.
Replace front and hold in place with a couple screws.
Turn unit around.
Remove screws holding heatsink (6 screws)
Open rear storage door.
Carefully pull amp section out, being careful of tightly routed wires. Note any connectors you disconnect.
The amplifier is the board on the top, the power supply is in the silver box.
Push the power supply forward and loose the black screws holding the amplifier board bracket closest to the heatsink.
Loosen the top brass screws holding bracket to heatsink and remove the bottom screws.
Remove all eight of the screws holding the transistor brackets & transistors to the heatsink. Look and take careful note of how the plastic insulators weave through the transistors. If you get this wrong, you can short out the whole amplifier when you turn it on.
Slide the amplifier board down and out where you can get to the bottom. Note the wires and connectors going to the small protect board over the amplifier.
Check the transistors with a multimeter to find the shorted ones. Remove and replace bad transistors. These are connected in pairs.
Reassemble in reverse. Be careful of reconnecting wires and insulators. Don't test until the amplifier PCB is back in place and you're sure of all wires. If the PCB is touching the power supply, you'll short it out.

Good luck, I told you this wouldn't be easy!

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What resistor do I replace when changing transistors on u-87? Mic has low output now. I replaced the old SK 103 transistor for a 2n3819 transistor from neumann and it came w/ a resistor for matching but no...


Try contacting them through this link and ask to speak to a tech. Write or email them if you have to:http://www.neumann.com/?id=service_servicepoints&lang=en

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Fender 1000 Roc Pro Amplifier Head


Hey man

The tube is on the PCB internally, you will need to pull the chassis out of the sleeve to get to it. Not hard.... Do this by removing the screws that secure it in place on the outside of the sleeve. sometimes they are a little "stuck" in there sticking to the trim covering that they have been clamped up against. The tube itself will very seldom give trouble though, as it is by circuit design way underdriven with quite low cathode volts so they don't loose their edge nor fail. Putting a different quality of tube in there wont make much of a difference in tone either because of this. the tube is only used for the gain channel, so if you have clean sound but no distortion, then it may be the problem, or the large ceramic ballast resistor R116 may have dry solder joints. If you have any questions about this, happy to talk to you. A FixYa is a great reward for helping you out. Cheers

regards
robotek

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Low Mains hum


Definitely sounds like a ground issue, try plugging it into an outlet on a seperate house circuit, or you could always live on the edge and clip the ground on the plug via an adapter plug.

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1 Answer

Cable break!


1. clear cut off the damaged section,
2..solder or ideally wire-wound the connections,
3. insulate the wires with plastic tape, or plastic sheet,
4. shield the wires with aluminum foils,
5. wrap up the outer.
6. done.

good luck

pc-cook

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