Question about Motorola Radio Communications
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Posted on Jan 02, 2017
Problem resolved. Although the membrane control panel passed the diagnostic test, it was defective. Probably a low voltage conductor went to ground, allowing the buttons to operate but throwing the control board into error mode.
Posted on Nov 11, 2007
SOURCE: maxent MX-42VM11 won't turn on
I had the identical problem (clicking sounds, no picture, but just the sound). I took Richdogg's advice above, but it didn't work out for me (lost money on the purchase of the part) - no offense Richdogg as I'm sure that was the problem in your TV. I later found out that the problem was with the Y-Sustain (also called Y-Main) Board. As with most parts in this TV, this is also made by Samsung and used in Maxent, Magnavox and a number of other 42" TVs. The part number is LJ 92-01256A (using LJ 41-02668A also give you the same part number). Hope others will find this useful.
Posted on Apr 11, 2008
SOURCE: Mackie SRM450 won't power on.
I have the same issue... it somehow appears that no power is present at Q34 / Q35 on the schematic but I dont know how to trouble shoot it!
Posted on Oct 29, 2009
Call the dealer who sold you this car while it is still under warranty and insist that they repair it. The cruise control is quite a complex system and a scan is required to isolate the problem.
If you care to learn a bit more about the system read on:
Cruise control systems are comprised of electronic and mechanical subsystems. This is how they work.
We all know that the things that control the speed of the car are the gas pedal and the brakes. And the brain that normally controls the speed of the car is the brain of the driver. The driver senses the speed by looking at the speedometer and then adjusting the pressure on the gas pedal or the brakes to compensate for variations in the desired speed. The cruise control system does the same thing with one exception. It only controls the gas pedal - it doesn't even know there are brakes in the car!!
The vehicle's speed sensor which is mounted on the output shaft of the transmission (the thing that drives the wheels) sends electrical pulses to the computer, pulses which are generated by a magnet spinning past a sensor coil. When the vehicle's speed increases the frequency of the pulses increases. For any given speed of the vehicle there is a corresponding pulse frequency. It is this pulse frequency which the cruise control tries to maintain as a constant. You think of it as the vehicle's speed.
The brains of the control box of the cruise control has three functions. First, it stores the speed of the vehicle when you press the "set" button whild travelling at the desired speed. It keeps this value in its memory until you turn the ignition off. Second, it receives the pulses from the transmission sensor and compares the frequency of those pulses to the frequency value stored in its memory - the set point. Third, it sends pulses to a vacuum controlled diaphragm connected to the accelerator linkage. The pulses it sends regulates the amount of vacuum the diaphragm receives. The more pulses, the more vacuum and the more vacuum the more force on the accelerator linkage. The system continues to add vacuum force until the set point speed is reached. At that point the system modulates the amount of vacuum the diaphragm receives in an effort to maintain the number of pulses coming from the speed sensor as close to the stored value as possible.
OK, so this "brain" works just fine in controlling the speed of the vehicle until something goes wrong. What can go wrong?
First, the VSS, the thing that sends pulses to the brain might fail. Normally the speedometer also fails so that's pretty easy to diagnose.
Next, the power to the brain can be interrupted. A blown fuse or a corroded connector can prevent the brain from working correctly or at all.
Next, the brains can lose its ability to function. A faulty component can prevent the brain from doing its thing. The brain is a pretty sophisticated box that contains a lot of electronic components including a microprocessor. NOrmally when the brains fail you need to replace the box..
The vacuum diaphragm can develop a leak. If that happens then the cruise control might set and hold the speed for some time however if the leak is larger than the supply line and modulator can add vacuum to the system the system will slowly lose control and the vehicle will slow down. This can also happen if the vacuum line to the diaphragm is cracked or loose.
Finally, the linkage that connects the diaphragm to the accelerator linkage can fail. Some aftermarket cruise control systems use a short length of what looks like fat key chain - bead chain. I have seen several units fail when the chain simply breaks.
Diagnosis of a failed system can be a complex process. Most vehicle shop manuals have a multi-page diagnostic flow chart that the dealer mechanics use to solve failures. If there isn't an obvious problem like a broken wire, a blown fuse or a leaking vacuum line then the problem most likely lies in the brains of the unit or in the switch that sets the speed and contains the other functions of resume and accelerate. Most cruise control switches are on the directional signal stem, a multifunction switch assembly with fine wires that break due to the constant motion of the wires as you use the directionals in your daily travels.
Posted on Nov 04, 2009
Tips for a great answer:
Aug 19, 2013 | Motorola Talkabout T5720 (7 Channels)...
Reset to Factory Defaults (Pg. 34)
Reset to Factory Defaults will set back all radio
features to the original factory default settings.
To do so, press PTT, SB2 and SB1
simultaneously while turning ON the radio until
you hear a high tone chirp.
Here is a link to the user guide: http://www.twowayradiosfor.com/pdf/RDX-Non-Display-manual.pdf
Programming instructions begin on page 36.
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