Problems superclocking CD3 with LCAudio LClockXO2- Help
Posted by: leslie on 01 December 2002
I have just changed the large smoothing caps and fitted an LClockXO2 to my CD3( which was working perfectly before). When I switch on the laser moves into position and the Naim logo is illuminated, but nothing else-no display and the switches are inoperative. The only fault I can detect is that the LM337T which is close to the old crystal gets very hot after about 5 minutes or so. Any advice welcome please.
Posted on: 01 December 2002 by john rubberneck
If that reg is getting that hot and you have no TOC read then why not put it back to original just quickly to see if you haven’t done something silly, I assume you have double checked the wiring
Stuart
Posted on: 01 December 2002 by john rubberneck
Have you got a separate psu for the clock panel or are you taking the power from an existing reg
Posted on: 01 December 2002 by leslie
The clock has its own regulator fed from the smoothing cap +ve terminal. The LM337T still overheats when clock disconnected.
Posted on: 01 December 2002 by john rubberneck
If you put the xtal and caps back does it read the TOC (with new board disconected)
Posted on: 01 December 2002 by john rubberneck
You say (The clock has its own regulator fed from the smoothing cap +ve terminal) is this a 12v supply?
Posted on: 01 December 2002 by leslie
Unfortunately I destroyed the caps when removing them, but do you think that removing the crystal, 2 caps and the resistor could affect the display, make the CD inoperable and lead to the LM337T overheating.
Posted on: 01 December 2002 by john rubberneck
Well your clock module is the replacement for the existing oscillator network, you where right to remove them, and should have connected it here, what I still haven’t understood is how its being powered.
Posted on: 01 December 2002 by leslie
Yes. Double regulated to 12v.
Posted on: 01 December 2002 by john rubberneck
Ok as caps broken now no immediate way back, with out an oscillator you wont read the disk i.e. get a display, when you say double regulated do you mean you’ve added a regulator in series to the 12v supply.
Posted on: 01 December 2002 by leslie
I have regulated in 2 stages from the +27v or so at the cap. First stage to 17v and then down to 12v. Could a faulty clock cause these problems-no display, no controls, and LM337T overheating. If you think so I could try to find 47pf caps to replace the broken ones and refit the crystal etc.
Posted on: 01 December 2002 by john rubberneck
Sorry just popped out for a couple, the fact that you have no display and no controls seems more than a clock oscillator problem to me or though I wouldn’t expect the transport controls except maybe eject to work if you had no TOC displayed, just one point it is sometimes difficult to distinguish which is the o/p and which is the ground on some oscillators, safe bet would be to look at the pin out on the chip, in any case if you reverted to the old you would defiantly know weather it was new or old causing the problem and that is the first path I would go down.
Posted on: 07 December 2002 by john rubberneck
How have you got on so far?
Stuart
