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Can you give me block diagrams of high impedane 4 input mixer? plz.. its our project

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Posted on Jan 22, 2009


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Hi Patricia,

Go to this link for the machine manual pdf. On page nine, WIRING DIAGRAM - GEM120A-10.

Fare. Well. My Lady.

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This is a high output piezo pickup but won't give line level signals expected by some inputs so I would guess you may be going into a line input. If so try a mic input (XLR) instead and see if that works.

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I have a Behringer 1002 mixer. Applying 0 dBu unbalanced to the input I need the -10/+4 control in its most sensitive position to acheive 0 db out with the main output control set at 0 dB. Is this cor

Depends on the input you are using. First you need to calibrate signal coming in with the Gain attenuation knob. Setting this prior to adjusting your channel output volume should calibrate the signal so when the channel volume knob is set to 0 and the Main volume is set to 0, the meters should indicate a true 0 reading.Not setting the Gain correctly will affect this. On the 1/4" channel inputs, you have less adjustment and may have to adjust the item you are plugging in from its source. If you are having issues with high gain, chances are it could be a cable issue, or something from the source itself.

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HL-R4667W vertical lines when I use any of the components and or AV inputs, but is ok with HDMI, any help?

Someone would have to look at a schematic to see where the HDMI comes in in order to know where problem is (what to replace).

Since a/v jacks show same trouble it is well after the tuner and is likely located on the board connected to the jacks for input---an area that deals both with tuner and conventional rear inputs.

A schematic or even a block diagram of signal flow in the set would narrow this way down to what you need to replace.

Try to Google for this with the model number and words like block diagrams, service manual etc.

One last foolish thought---have you removed the HDMI connection to see if other inputs clear up?

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Bosch Compact Mixer Model UM 4. I am replacing the spur gear. That seems to be fine, but, like most of my projects, I now have "extra" parts. One is a foot. The other 2 are washers. The third is the...

Check this assembly diagram of a similar model.
The spur gear is part 7 and the rest seem to be washers etc around it.

Unless the rectangular block is part of the packing it may have fallen off from the one of the assemblies in the main body when you opened it. The assembly diagram could help you find the location.

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Connect active subwoofer to Studiomaster Walkabout

You CANNOT have a stereo set of RCA jacks "wyed" into a single XLR mono input.

The RCA output drivers will "fight" each other. Some things will appear to work, but give poor performance.

You could make a rudimentary passive mixer by putting a series resistor say 1K ohms from each of the RCA's to a common UNBALANCED input of a subwoofer.

The XLR is balanced so that would not really work unless you also have an unbalanced input on the subwoofer.

The right way to do this is to get a cheap two input mixer that has EQ with it and mix your two mains before sending to the subwoofer. You want a little mixer that also has balanced outputs (XLR or TRS) to send to the subwoofer.

UNLESS the subwoofer has EQ in it, you really need to have an EQ in the little mixer so that you don't send high's to the subwoofer... They don't like highs and the sound will suffer.


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Hi there my allen heath mixer is weired this

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My 55" Phillips Rear Projection tv has perfect sound but no picture at all.

Hello sdbeynon,

This usually denotes a problem in the high voltage section either trippler or the IHVT. Since this section of the Tv has hazardous voltages I would suggest that you get a TV repair technician to give you an estimate on the cost of repair.

Judging by what you described it sounds like the trippler may have a problem. Have the technician check that first, or if you have a high voltage probe here is the procedure:

1) Remove the rear of the Tv set

2) clip the ground lead of the HV probe to ground.

3) using the tip of the probe touch the input of the trippler block you should have a voltage of 20Kv - 30Kv

4) touch the individual outputs of the trippler block they should each read 20Kv to 30Kv.

If the input is not present the IHVT or the trippler is bad, however if the 20Kv to 30Kv is present on the input but not the output the trippler itself is the problem.

I hope this helps,

Thank you,


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