I have a Lexicon MC1 which has been working fine for the last 6 years. it was properly setup by a specialist. Recently the volume has started to drop to zero on its own accord and has to be put back up manually. Other times when watching movies the sound goes all fuzzy and the only way to hear anything meaningful is to put it on 2 channel. DTS, THX 5.1, 7.1 all sound awful. Any ideas?
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Re: Volume has started to fade
If the problems are intermittent, then the amp will most probably be suffering from dry solder joints. This is not uncommon about power devices in the unit like output stages and power regulators. I suggest that the amp needs to be checked over for such problems, and where needed resoldered to bring it back to a reliable state. If you are a gun with a soldering iron, you could do it your self. For this sort of work, I prefer to use solder with a 2% silver content as it produces a mechanically stronger soldered joint, and has a higher resistance to failure from the rigours of heating and cooling that constantly happens in amplifiers. If you think you dont have the skills required(good quality soldering is an practiced, and aquired skill), then get it into a decent repair guy for some attention. If you dont fix these problems,new faults may manifest themselves, and even expensive failures to output stages if left unattended.
Happy to answer any other questions you may have about it, just give me a hoy :) Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.
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No that's how to describe a problem, folks - with details. Using internal FM as the source is always the preferred way of troubleshooting system-wide receiver audio problems (no cables or setting in the way).
Does the sound come on immediately with power and then fade or is there a small delay while the electronics stabilize, a click and then sound that fades?
The fizzle probably means something is rapidly overheating or a capacitor is malfunctioning. If both channels do it, I'd suspect a common power supply problem. Can't help much more than that.
I have access to the Lexicon service guys, but will need a bit more info to assist in tracking this down.
1) Have you noticed any pattern to when the unit fails. In other words, does it tend to fail more readily after being on for a while, or is it consistant in behavior regardless of time?
2) Does the volume level of the unit change the total time before failure?
3) If you uinplug the unit for 1/2 and try using it, does the behavior change?
Please update this with the answers and also, if you could post what has already been done by the service center, that would help as well.
At this point, I would be suspicious of hte 5V line and/or the microprocessor internal controls. I'll research this a bit and try to get you more details as well.
Amplifiers get hot. The more you crank the volume up (or use extended for extended periods), the more current is required. When it gets hot, there is a fan motor (on the back), that should turn on. I believe your fan motor (brush) is worn out and therefore non-functional. Under this condition when the system overheats, it automatically changes mode to protect circuits.
Also note: if it works when you initially turn it on (cold) for a few minutes it should work fine...until it starts getting hot inside the case.
It sounds like a source slecton issue. Try the following and if that does not help I would start with a simple stereo setup and source and work up from there.
The RV-8 is powered on, but there is no audio.
1. Make sure volume level is audible. Volume level can be
increased with the front-panel volume knob or the remote
control VOL and buttons.
2. Make sure audio has not been muted. The message “MUTE
ON” or “FULL MUTE ON” will appear in the on-screen and
front-panel displays when audio has been muted. To deactivate
mute, press the Mute button or adjust the volume level.
3. Check the INPUT SETUP menu DIGITAL IN and ANALOG IN
parameters to ensure the appropriate audio connector is assigned
to the selected input.
4. Make sure the RV-8 is receiving an audio signal. To do this,
follow the instructions that begin on page 2-29 to open the
STATUS menu for the current input source. Hint: (Use the "STAT2" Button on the remote.)
In the event of a power outage, the RV-8 will display a BROWN
OUT!! PRESS STANDBY message. To turn the unit on, use the
STANDBY button. For more information, see “POWER
MANAGEMENT” on page 3-3....
POWER MANAGEMENT ON, OFF
"Setup" >> "Power Management"
Opens the POWER MANAGEMENT menu, which is used to automatically
put the RV-8 into standby mode during brownouts.
When set to ON, the RV-8 detects low voltage levels or a momentary
loss of power and puts the device in standby mode. In the event of a
power brown out, the RV-8 will display a BROWN OUT!! PRESS
STANDBY message. To turn the unit back on, use the front panel
When set to OFF, the RV-8 will attempt to function during a
momentary power loss, however software settings may become
corrupt and need to be reset.
When the RV-8 is in standby mode, pressing the button turns the
unit on and activates all zones that were active in the previous
The RV-8 does not power on.
1. Make sure the rear-panel power switch is set to the | (“on”)
2. Attempt to power on the RV-8 with the front-panel Standby button and remote control On button.
3. Examine the power cord to ensure a good connection between
the rear-panel AC input connector and the wall outlet.
4. Check the electrical circuit and breaker.
check the following1-no headphone jack is inserted. 2-check power cord firmly connected.3-if you have any doubt in remote change the battery with fresh new one4-unplug the system from power and replug it.5-check your volume level maybe it is in low level.-setup your speaker again.6-check speaker cables disconnection-7 -check that mute button not pressed.
Hi Hansjo. You may find that if one capacitor has failed, then there may be more. If you see any signs of bulging, leaking, or pushing the bottom out of any caps, then It is a good idea to just change them all. For the small expense, it is worthwhile knowing that your power supply has fresh caps. Try the amp and then see how it goes. If you still have problems, get back to me here and we can talk about it more.