Question about Acer (56.04145.901) (5604145901) Power Supply

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HOW DO I REPLACE THE JACK FOR THE EXTERNAL POWER INPUT

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1 Answer

Cobra 200 has no power and lights do not light up


Could be a number of things power related. Check the input cables to the radio and find a broken cable or jack. Otherwise check the regulator circuit of the radio internally. If the external wires are not providing DC than it is likely the cabling.

Feb 01, 2015 | Cobra Radio Communications

1 Answer

What screws need to be removed to get inside the keyboard to replace power supply input jack


Flip the keyboard on its back and remove all screws with an arrow.

If no arrow, remove all on outside edge.

The jack should be easy to replace but you may need a soldering gun.

May 07, 2014 | Korg PS60 61-Key Performance Synthesizer

1 Answer

My frontman 15r has power but no sound


Check to make sure the problem is not with the headphone jack or the external speaker jack as these are in the circuit between the power amp chip and the built in speaker.

You can also trace through the circuit with a music source on the amp input and with simple headphones check the signal path through the circuit until the music disappears. To do this, take a headphone and set it up with 2 test leads on the ends- attach one to ground.

Now your TL072 op amps have 2 outputs, pin1 and pin 7. The inputs for pin 1 are pins 2 and 3, and the inputs for the amp section outputing on pin 7 are pin 5 and pin 6. If you get sound at pin 1 or pin 7, you move forward to the next TL072. Check for output. Then move to the power amp chip on the heat sink. Pin 1 should be the output and will be wired to the headphone jack first. The external speaker jack second and the built in speaker third. The input for that power amplifier chip is pin 7 or pin 8 depending how it is wired.

If the amp chip is blown, make sure to put an adequate amount of thermal grease on the back side of the IC in contact with the heat sink so it can operate as cool as possible.

Apr 03, 2012 | Fender Music

1 Answer

Will not turn on,


Hi,

Try these.

- Remove battery, press power button for at least 20 seconds. Power on the system using the AC adapter (charger).
- Use another working AC adapter if still no power.
- Make sure that the DC input jack where the AC adapter is inserted to the laptop is not broken, otherwise, replace motherboard.
- If you get power but blank screen, connect an external monitor. If you get display on the external monitor, the LCD needs to be replaced.
- If you get no display on the external monitor, reinsert the memory module/s (RAM), otherwise, the motherboard needs to be replaced.

Hope this helps.

Jul 17, 2011 | Toshiba Satellite L455DS5976 Notebook

2 Answers

Where is the line in jack for my Gateway MC7321u Notebook? Is it one of the headphone jacks?


Some computers have a special jack labeled line in. If your computer does not have a line in jack, you can use the microphone jack. You can then adjust the volume of the device in control panel under sound options. The headphone jack is only for output. I have seen some computers where you plug in a cable to the microphone jack and you will be asked what kind of device it is.

Jan 17, 2011 | Gateway MC7321u Notebook

1 Answer

The loop and the manual tone store functionality !


Usually the loop in is used with an EXTERNAL effects module where the audio signal is "looped" out through the external effect module and then back to the power amp to drive the speaker in the cabinet. The LOOP IN jack would receive signal from the EFFECTS module OUT jack.

The source to go TO the effects module INPUT may come from a jack such as preamp out, or sometimes the same loop jack if it usess the TRS (Tip-Ring-Sleeve) connection method.

If you do not have an external effects module, all this is a moot point in your case.

Jul 17, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

2 Answers

The center pin of the external power supply jack is broken off. Is there some place who repairs scanners ?


your second option is to re route the track so by solder 2 wires to the original power input and routing them to the ear phone socket make sure to disconnect the wirering from the ear socket first ,on your power supply unit remove the jack and replace with ear phone jack makes sure to put positive to centre and other to ground earth

Jan 14, 2010 | Radio Shack Pro-94 Scanner

1 Answer

Hi, what is the size of the nec f5275 dc jack? thank you


The DC jack for this laptop is specified as follows.

AC Input : 100~240V /50-60Hz
DC Output : 19V 3.42A
Connector size: interior diameter: 2.5mm
external diameter:5.5mm
Power Cord Required: 3 Pin ( Clover Leaf )

Nov 14, 2009 | Televison & Video

1 Answer

Peavey 115 Low hum Low volume from input


The preamp section has a problem. It could be anything in the preamp but is OFTEN the input jack itself. They take a lot of abuse.

Also the insert jack contacts that forward the preamp to the power amp if no external FX are used can go bad.

Additional things are circuit board cracks caused by rough handling and also controls that have had the knobs mashed in which can destroy the potentiometers they are connected to.

Sep 19, 2009 | Peavey Music

1 Answer

No external sound


Try power cycling (unplug power from rear, wait 20 seconds and the power back up). As far as the left side audio problem, confirm you do not have the left analog input (white) plugged into the device digital input which is located below the right (red) input jack. The Left input jack is above the right input jack.

Nov 12, 2007 | Bose Lifestyle 38 System

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