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Dismantle sequence for Amicroe AMI-TT4 Tablet

Centre pin (+) on power supply socket appears to be "dry jointed" or loose connected to internal print...require to remove back panel to re-solder same. Does the plastic surround which appears to have an engineered crack and two very small screws retain the metal back panel? I spent fifty odd years in the electronics servicing game and it always pays to ask... Regards, Bernie de Silva

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Bernie,
I have the same problem with my Amicroe. Did you get the back cover off yours? If so, how did you do it?

Posted on Jan 10, 2015

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Posted on Jan 02, 2017

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Casio keyboard will not power on


2 possible solutions to look at.

1) Ensure that the power adaptor is the correct polarity. Ideally you should use a Casio power supply rather than a generic one. For Casio the centre pin must be - Negative. Many power supplies have + as the centre pin, this is therefore like connecting the batteries up backward - IT MAY DAMAGE YOU KEYBOARD

2) The socket on the keyboard where the adaptor plugs in is prone to breaking and coming loose from the circuit board Looks something like picture below ( maybe grey ) This can often be diagnosed by holding the power adaptor plug where you clip it into the keyboard and moving it at the same time as turning on. If you get any lights the socket is faulty and will heed to be replaced. If you post the model number I can advise on socket needed.

3) More serious internal damage possibly as a use of wrong power supply ( see note 1 )

Good luck in tracking the fault.

8152c305-074a-411d-87c2-309b04f87d4a.jpg

Mar 11, 2014 | Televison & Video

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Battery not charging on AMICROE AMI- TT4 been on charger since 11am now 4.30


The mains charger for the Amicroe 10" Tablet is prone to failure. It is because of faulty manufacture of the DC power plug that inserts into the tablet (on the end of the charger output cable). I have dismantled the moulded plug and found that one of the internal lugs become open circuit during flexing of the plug. I have had 3 of these chargers fail within 12months of tablet purchase. Amicroe Australia will replace them under warranty. I suspect that the genuine replacement chargers have the same manufacturing fault.
One solution is to cut off the plug and solder on a new, better quality plug. But, so far I have not found a suitable separate plug available for purchase anywhere. However, I found a new charger on eBay here: http://www.ebay.com.au/itm/9V-AU-Wall-Charger-Amicroe-TouchTAB-IV-9-7-TABLET-PC-AMI-TT4-AC-Adapter-Power-/301137488216?

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You have to tap firm sides of the Toshiba TV in order to see a picture


Hi Jaime.
Well it seems you have a dry joint or loose connection somewhere
in or to this receiver. Faults of this nature may at first seem straight forward but they can be very frustrating and often send you on a wildgoose chase.
The most valuable tool you posses will be patience and if you are still reading this then this virture in you is onfirmed. So let us continue.
We first need to narrow down the suspect area where the problem may be hiding. You say the picture is intermittent so I'm assuming
you still have sound. If you still have a raster (brightness on the screen) then the line oscillator, line drive, line output and EHT circuits are all functioning and your attention should be drawn to the composit video circuits in particular dry jionts on the rca video input socket your a/v cable is connected to (it's the yellow one)..
If you have only a blank screen did the disappearing picture
go to a horizontal line across centre of the screen just before going blank. If yes then the problem probably lies in the
frame output stage. Resolder all pin connections to the frame output ic (even if they look ok) and all pin connections on the flyback transformer (Line output transformer to some of us).
If the picture fades away rather than flashing off then look to see if the tube heaters are still glowing, If not resolder the heater pin connections on the tube base socket and all pins on the flyback
transformer. Stll haven't cured the problem ? Have a nice cup of tea before poceeding, you've earnt it by now.
OK once more into the breach dear friend, it's time to get violent
with this stubon beasty and start tapping the circuit board to find the most sensetive area and resolder all the joints you can find within a two inch radius of this point. The most common points for dry joints to occure are in the power supply, line output stage and
frame output stage (vertical stage to even more of us)
Good luck Jamie. Best regards from Vintie

Jan 04, 2014 | Toshiba CF36H50 36" TV

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How can I block permanentlyFacebook from my Amicroe Android Tablet model AMI-TT2


By the way u can do this by go to setting & privacy option in ur fb a/c then press general option and then press account deactivate option.

Jun 28, 2013 | Computers & Internet

1 Answer

My DVD/VCR combo keeps turning itself off. I can't watch a DVD or VHS tape.


This is typical with many sets when it goes old as there is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing. Check the power plug and the power socket for loose connection.

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1 Answer

Door star lamp on OMT faulty


Hello,

Have you tried to replace the lamp? A good source of supply is at www.victoryglass.com
If the lamp is ok then trace out the cables that supply the lamp back to the jukebox power supply. It could be a dry joint (cold joint in the USA) on the connection pins on the board. It could also be a problem with the lampholder.

Regards
Alan Hood
ami-man
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Apr 28, 2010 | Wurlitzer Jukebox 1015 One More Time...

2 Answers

I have a Nostalgic Bubbler Rock- Ola CD Jukebox that the sound keeps going on and off


Hello rudy691,

Check out the the phono connections from the Decoder through to the amplifier to make sure all the connections are seated correctly.

The Decoder boards were subject to dry joints around the phono sockets and power regulators on the board. Check out for any cracking around these soldered joints.

I would also look for dry joints (called cold joints in the USA) on the connections on the amplifier.

Regards
Alan Hood
ami-man
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Feb 25, 2010 | Wurlitzer Jukebox 1015 One More Time...

2 Answers

My cd rowe ami jukebox is stuck in scan/transfer mode


Hello,

You say you do not have the digital display lite up, have you checked all of the breakers on the power supply?
If not do so. Rowe Ami jukeboxes are very prone to dry joints (cold joints in the USA) this is cracking around the soldered pin on the connections to the boards.
If you can solder correctly then check out the printed circuit board on the power supply. I would retest and see if the display now lights after correcting a fault on the power supply.
If that has not made any difference then proceed to the Mechanism Control Board and the Central Control Computer (CCC) and check again for dry joints.

If you can not solder with any confidence then send in your boards to a Rowe Ami specialist for testing/repair.

Regards
Alan Hood
ami-man
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1 Answer

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The power socket may have dry solder on its joints, If you are not a technician, get this fixed by the service centre.

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1 Answer

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Hello,

I take it that the jukebox accepts selections when you type them in. Also that you have tried selecting the A side and the B side records.
Is the switch on the CCC (Central Control Computer) set to Record it should not be set to Video.

Rowe Ami jukeboxes are very pone to dry (cold in the USA) joints.
If you can solder then the following items need to checked for dry joints.

Power Supply PCB (printed circuit board)
CCC
Mechanism Control Board

When taking out the plugs pull on the plugs (not the wires)
Look on the soldered side where the connectors pins are fitted for any cracking around the soldered joint ( this is the sign of a dry joint).
Resolder any suspect joints on all of the boards and refit into the jukebox and test.

If this does not cure the problem then the boards will be needed to be sent to a Rowe Ami specalist, I am one of these in the UK.

Regards
Alan Hood
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