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Lights go on but no sound

I have a Qchord QC-1. It has sat unused for two years, in its cover case, and is in mint condition. Lights go on when power is pressed, works with both batteries or its power supply. It has not been dropped or mishandled in any way. Batteries are in perfect condition, no corrosion. Worked perfectly when last played. What am I doing wrong? Problem Solved! I’d left phono plug in place. Ha, ha!

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Could you value an Epiphone Guitar, Model E-252, Serial No. 301836 and also date it?

I think it is a 1965. As to value, it would be worth US$3000 - $4000 depending on condition. There was one being sold for around US$5500, in mint condition.

You might want to get a professional appraisal on-line for an instrument like that one.

After few years of use, some pitches (not all) in stromplate are flat.

You should contact them directly. Here's a link to the information

How can I clean the contact for the keys, some are hard to push?

1: Clear an area on a table or other large flat surface.
2: Spread out a towel or a padded cloth.
3: Place your Q-chord on the towel upside down with the battery compartment facing you.
3: Remove the batteries. Unscrew all the screws. You don't have to remove them. Leaving the in the case means you won't lose any
4: Lift the bottom case off carefully. There's a white connector that plugs into the bottom printed circuit board. Gently uplug the connector and set the bottom of the case aside screw side up so the do nor fall out.
5:There are four ribbon cables. One at the portal for the q-cards and three others. Gently unplug them from the circuit boards.. Don't worry, you can't get them mixed up

6: Unscrew all the screws for the top green circuit board and remove it. Set it aside.

7: You will see a tan board under it that slides partially under a smaller green board. Don't bother the smaller circuit board. Unscrew all the screws in the tan board, and set them aside.

8: Lift out the tan board and flip it over. You can use contact cleaner, or a little rubbing alcohol Q-tip to clean the contacts. Or use a lead pencil eraser and gently "erase" over the contacts. A little bit will usually do you. Don't overdo ANYTHING.

9: Reassemble in reverse procedure. Don't worry. The parts will only go back on the right way. Once you're done, power it up and try those bad chord keys again. They should work.

Keys keep wavering and changing

Clean the buttons, actually the switches underneath the buttons with contact cleaner, sounds like one is stuck.

Every other 7th chord, Ab7th, Bb7th, c7th, D7th, E7th, F#7th, will not work. What is wrong and do you know someone I can contact to repair it.

The manufacturer is always your best and usually your best price. But I do not know of your situation because you guys do not add enough detail... are you able to do without it for any length of time? Skill level? Are you on the road? In the studio? How long have you had it? Did you read the operators manual? No one ever does although I do not understand why when you can learn features you would never have dreamed of.
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