Tip & How-To about Zoom H4 Handy Recorder

When I turn on my Zoom H4n, it says no card

To solve this problem you will need a screw driver! disassemble the unit and reassemble, the card connectors some times they move if dropped

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appears that the 3.5MM input jack (for my ipod) is loose/broken. How to replace it?

to do that you'd actually have to disassemble the unit. ( start by removeing scews on the bottom ) and dropping out the pc boards that hold the jack or are in the way of the pcb with the jack on it. at which you'd just have to un-solder old jack and install replacement and reassemble and your done. you cann call american audio to find distributers of their parts.

Sep 05, 2011 | American Audio CK 800 MP3 CD PLAYERS SOUND...

1 Answer

I have a set of JBL TR225 I need to take one of the woofers out but cannot figure out how to disassemble it. It has no screws to support the grill or the back side. Any info are links you can give me will help me. Thanks Manuel.

Often there are small screws retaining the grille... sometimes they are black and hard to see. Other times the grill sits in grooves at the side and one has to "buckle" the grill outward to disengage the edges from the grooves. Sometimes the metal grille has rubber strips at teh edge and when reassembling, they need to be restored to the grille before it is "buckled" to get it back in the grooves. One needs to use a medium sized flat bladed screwdriver to pry up the middle of the grille at one of the two free sides and get it out of the grooves.

May 06, 2011 | JBL Bags JBL Sub Transporter Case Speaker...

2 Answers

1 key does not spring back when it is pressed and 1 key has a bit of resistance when pushed

The elektrotanya website link proposed in the other solution here did not work for me. So with a similar sticky keys problem on my YDP-113 yamaha digital piano, i just started taking it apart.

I found that the problem was that the sticking keys actually had small cracks at the hinge end. See attached photo for a picture of the hinge end of the key. The cracks are very small and hard to see, but if this is your problem, you will see it in a good light. Having the key apart will also allow you to clean the sides well in case there has been a bubble gum attack or similar problem.

After learning that replacement keys are extremely expensive (like $15 per key...) I decided to move the bad keys to the highest and lowest notes on the keyboard (88 key keyboard so there is some seldom used territory). The center several octaves are now free of sticky keys and this is good enough for now.

The procedure on my YDP-113 was:
1. Remove black screws from back panel of unit to allow top to slide forward and then lift off. Set aside.
2. Roll the roll top all the way closed and then simply lift up to remove. Set aside.
3. Remove the six screws which attach the roll top gear rail (3 screws on each side panel). Set aside the gear rails.
4. Remove 2 screws in the key top bracket, and 1 screw from each end of the key top. "Key top" is my name for the small strip which lies along the top of the keys. If you have an official or better name, please share.
5. Remove the 10 or so large screws and two small screws which hold the keyboard panel down in the unit.The keyboard should now be able to slide a few millimeters toward the back of the unit.
6. Remove 1 screw to take out the power switch panel. The front of it hooks in with a tab, so slide it back and then it will lift out.
7. Careful now. I felt this was the one operation where I had an opportunity to ruin the unit if I would have fumbled: Lift the keyboard up slightly and rest its front 'legs' on the front edge of the case. Careful of small wires to not rip them. Careful of the circuit boards that are underneath the keyboard frame. jeff20112011.jpgThe objective here is to allow the keys to come out toward you so that they can be removed and replaced or swapped. You can kind of see in the cracked key end photo, how the keyboard is up and partially out of the unit.
8. You now can do the actual swapping. To remove a key, pry up very gently in back of the key with a small screwdriver. jeff20112011_0.jpgIt will pop up. Then gently work the key around to free it from the return spring without bending that spring. Replace with a new key or swap will a good working key in a little used position. Note that B and E are interchangeable, also C and F. Some other keys also look like they could interchange though I didn't personally try it.
9. Reassemble in reverse order of disassembly.

Apr 06, 2011 | Yamaha YDP223 Digital Piano

1 Answer

I have a CDP-100 and need disassembly instructions for access to internal keyboard assembly. Unit was dropped while unloading from car. Now some keys are akimbo and won't play as though they are off their pedestal (?) or something.

I just fixed my CDP 100 which had a similar problem - dropped and two keys not working up one end.
1. Lay keyboard upside down on soft surface. Under keyboard is plastic cover held on by 17 screws. Remove all these and lift cover away. The metal key ends are all revealed.
2. Locate the disloged keys. Carefully press them back into position - they will "click" into place. Make sure the corresponding key on the keyboard isn't stuck in an "up" position - you may have to remove the metal key part and replace it again while making sure the key is correctly seated.
3. Replace cover and screws.

Feb 22, 2010 | Casio Music

1 Answer

roland d2 groovebox freeze

It is possible your unit has a bad/desoldered contact on the power supply connector.

See if it freezes when you are moving the power connector, if so, then you should disassemble the unit and resolder the contact pins on the circuit board.

Also check the power supply cable (it might be broken), see if the power connector on the unit has oxydized / dirty contact points (if so, clean them with some fine sandpaper), also check the main power switch with a continuity tester (if the power switch has dirty/oxydized contacts, you should either replace it or disassemble it and clean the contacts).

If none of the above helps, check all the connectors inside the unit, clean them if they are dirty and resolder the pins if the solder contacts are bad.

It could be a problem elsewhere, i just mentioned the first few things i would have checked.


3rq8 (Triarcuate)

Jul 28, 2009 | Music

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