diykits.com.hk clock help

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#21
Cant get it to work correctly!

What is going on?????

The clock is powered by a 12v toroidal, the tcxo is getting 5vdc as it should, I've removed the 2 old oscillator caps to ground and the resistor, theres no solder splashes or dodgy soldering and the in/out is correct but when I power the player (NAD C515BEE) the transport goes crazy. Its spinning eratically and clicking as if it doesn't know what to do............

Any suggestions??

Anyone had problems with their diykits clock??
 
#24
The return is the ground, it is the ground plane on your new clock circuit. Foreign translations sometimes aren't clear. The return should be connected to a ground point close to the chip you are feeding the clock to, or the signal can get into other circuits.
Where do you have the return connected now.
 
#25
Bill Fuss said:
The return is the ground, it is the ground plane on your new clock circuit. Foreign translations sometimes aren't clear. The return should be connected to a ground point close to the chip you are feeding the clock to, or the signal can get into other circuits.
Where do you have the return connected now.
Click to expand...

I replaced the old 2 pin oscillator with the clock, so I assumed the clock input/output goes to the same old positions?
 
#26
No, the new clock is self contained, it takes no input from the chip. Connect the clock output to the Xin and the return to a ground near the chip. That's it. I'm hoping nothing is damaged.

I tried to look at the clock on their website but the page wont load.
 
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#27
Bill Fuss said:
No, the new clock is self contained, it takes no input from the chip. Connect the clock output to the Xin and the return to a ground near the chip. That's it. I'm hoping nothing is damaged.

I tried to look at the clock on their website but the page wont load.
Click to expand...

You're a GENIUS!!!!

Thanks for that, the disc reads perfect and the toc is correct.
The only problem now is I have no output????

I'll try rectify that in a mo............


Ta
 
#28
Well...............

The clock is working perfectly and spinning the disc and reading it correctly but there is now no output. I've checked nearly everything apart from the signal from the Toshiba TC94A54MFG-001 IC to the dac. How do I do this?? have I killed the toshiba??

Ta
 
#29
I'm definitely not a genius. It might be toast, but probably not.
I could not find the chip's datasheet, but it is supposed to have built in DA converters. If you can find those output pins you could check it with a dmm. If you have an outboard DAC unit you could see if the spdif output is functioning. Otherwise, it will take an o-scope. Also worth noting, the chip is 3.3v,the clock is 5v. Check with the clock seller about the possible need for reducing the clock signal voltage.

Good luck, Bill
 
#31
Bill Fuss said:
Also, if you still have the original parts you could reinstall them and check the operation before you go any further.
Click to expand...

The original parts were 2 tiny ceramic caps and a resistor which I discarded when removed, so that's not possible. I don't even know the values to replace them.

I shouln't really be messing with stuff I have no idea about. Shame, it keeps costing more money to fix. I've now spent 3 times the amount of the initial cost of the brand new player on bits and bobs and all I've gained is a non worker.

Boooo.
 
#35
Super spankin great......

Fantastic...........................

After all that it was a silly little break in the circuit.
The circuit was broken from the Toshiba IC on the MCLK track to the dac where the old oscillator sat, oops, too much heat.

Good stuff, so after 6 weeks, 67 replacement caps, 3 Class D regs, opamps, CMC silver rca's, alot of dampening, a re-wire, a clock kit, a 12v toroidal, reels of mundorf solder, removal of un-needed bits, burnt fingers and alot of shouting, it's finished and the brucey bonus is............. it sounds great!

There's a photo attached if anyone's interested.

Chow fa now
 

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#37
kevinkr said:
I think we've all had those moments.. Glad you found the problem.

What do you think of this external clock as compared to the original crystal/internal oscillator?
Click to expand...

It's probably the most cost efficient clock upgrade out there, I'm not saying it's anywhere as good as those reference clocks which cost upto 20 times more but I can gladly say it's a huge improvement over the standard oscillator.

Chuffed!
 
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