Finally, an affordable CD Transport: the Shigaclone story

[ccschua]

I made a mistake and connected the V+ to the wrong pin of the LCD.

Smell some smoke coming out from the LCD panel and the BJT Q702 is burned.

Now the LCD display is stuck '38' and door does not work.

any help please.

 

[audio1st]

Hi,
Q702 is not needed so it can be removed..You must have connected V+ to a SYNC wire.

 

[audio1st]

I put a 10K ohm resistor in series off the DC output of the power supply. I never did see any back light so I checked voltage. I had 7.5 volts. I am assuming I destroyed the LED? How do I access the LED for replacement? Looks like the whole display needs to removed? So close yet so far.

Just remove the triangular lid and desolder the LED from the back..

 

[kevinkr]

I put a 10K ohm resistor in series off the DC output of the power supply. I never did see any back light so I checked voltage. I had 7.5 volts. I am assuming I destroyed the LED? How do I access the LED for replacement? Looks like the whole display needs to removed? So close yet so far.

It isn't necessarily the case that you destroyed the LED, you must have connected it backwards though. (The led reverse breakdown voltage is certainly lower than 7V, but the current was limited and it might/might not have survived the experience.) Recheck the connections first, (no errors, missing ground?) reverse them if necessary and then if finally replace the LED if necessary.

 

[Erik van Voorst]

Today I finished the Tunami powercord for the Pitbull
tomorrow I will make the connection...5 meters straight into the cabinet....very curious (more details dutch forum)

Each component has its own dedicated line with audiofuses...

 

[scrutinizer]

I got the idea from this cdplayer, and this one is not an DIY player .. looks like a mess in ther but nice on the outside

anyway iam saving my big caps for an nie amp

Hi Valo,

Don´t mind me asking you this question but why change or try to modify a ´VERY GOOD´ transport like the Forsell Air Reference

Anton.

 

[woody_allen]

@audio1st

I would really aprisiate if you find some time to replay on my post at sureelectronics tripath board.
Thank you in advance!

Sorry for OT.

Best regards,

Woody

 

[Badge]

Thanks for the info on my LED. I did check it with a meter and get no forward resistance so I did fry it.

 

[hayenc]

Thanks for the info on my LED. I did check it with a meter and get no forward resistance so I did fry it.

Consider it an opportunity to choose the color for the display that you desire. I really did not like the orange, but the blue looks really nice now. It is an easy replacement.

 

[ccschua]

Is it possible just to purchase the LCD panel as replacement ?

 

[sparkle]

Is it possible just to purchase the LCD panel as replacement ?

i doubt you will find the LCD panel .....
maybe if somebidy that allready used the transport, has some panel that he does not need.....
otherwise, i doubt it....

 

[audio1st]

Is it possible just to purchase the LCD panel as replacement ?

I would say no.
If you disconnect the ribbon is it still showing "38"?
Have you removed Q702? (you must if damaged).
Sorry to say you have most likely damaged a chip on the transport board.
The display should not prevent the transport from working.

 

[valo]

think i did kill my transport today .. i did mount the regulator to the frame but i did forget to isolate if from the frame .. my transport canot find tracks on the cd anymore, the display onely show 00 now..

iam going to order an new jvc rc51 now..

iam thankful for anyhelp that can bring my board alive again

 

[audio1st]

Hi valo,
The regs body is at 0V so should not have been a problem.
If you have unplugged the laser ribbon recheck it is connected correctly.

 

[kevinkr]

think i did kill my transport today .. i did mount the regulator to the frame but i did forget to isolate if from the frame .. my transport canot find tracks on the cd anymore, the display onely show 00 now..

iam going to order an new jvc rc51 now..

iam thankful for anyhelp that can bring my board alive again

Provided that you used an LM7808 regulator or one of its many variants the tab is at ground potential - more likely that you made some other error that resulted in an over-voltage to your board. (Like swapping the input and output pins on the regulator..) If you are sure you did not do this then you might want to check for other issues - I had the same problem when I did not have the mechanism ribbon fully seated.

Here is a link to the spec sheet for the Fairchild version of the part which shows very clearly what each pin is..

http://www.fairchildsemi.com/ds/LM/LM7808.pdf

 

[valo]

Provided that you used an LM7808 regulator or one of its many variants the tab is at ground potential - more likely that you made some other error that resulted in an over-voltage to your board. (Like swapping the input and output pins on the regulator..) If you are sure you did not do this then you might want to check for other issues - I had the same problem when I did not have the mechanism ribbon fully seated.

Here is a link to the spec sheet for the Fairchild version of the part which shows very clearly what each pin is..

http://www.fairchildsemi.com/ds/LM/LM7808.pdf

No , i have the rigth regulator an lm7808 and it gives me 8v, and everything did work just fine before i mounted the regulator on the frame..

 

[aparatusonitus]

.. my transport canot find tracks on the cd anymore, the display onely show 00 now...

Hi valo,

I used to have the same problem...found a few wary tiny cracks in display PSB board as well as main board. Use a magnifying glass and light bending to see offending PCB traces, solder them and you'll be back in business.

 

[valo]

Hi valo,

I used to have the same problem...found a few wary tiny cracks in display PSB board as well as main board. Use a magnifying glass and light bending to see offending PCB traces, solder them and you'll be back in business.

My display board is heavy modyfyed, just the connector left of it , but it did work just fine before i mounted the ergulator to the copper frame whit out isolating the regulator..

I did order a new JVC today so i shuld be back in business werry soon

 

[scrutinizer]

I got the idea from this cdplayer, and this one is not an DIY player .. looks like a mess in ther but nice on the outside
[....]
anyway iam saving my big caps for an nie amp

Sorry for the offtopic on my part....
Valo your first picture has got nothing to do with Forsell's electronic layout and his CDM9 pro 'airdamped' mechanism
So I think this contrapsion must be a DIY

Anton.

 

[valo]

Sorry for the offtopic on my part....
Valo your first picture has got nothing to do with Forsell's electronic layout and his CDM9 pro 'airdamped' mechanism
So I think this contrapsion must be a DIY

Anton.

Thats rigth Anton, the first picture i did post here is my DIY cdplayer.. the modyfyed Forsell is not mine .. I onely wanted to show you guys the 1F cap that its inside it ..