Hi guy,
I mounted in my cd player Marantz the Elso clock in accordance with instruction, but don't work. It spin like crazly forwards and backwards and I don't succeed to adjust with the trimmer of the pot. I changed all components on the pcb but don't changed nothing. Anybody have had this problem ? What resoved it ? Thanks
I mounted in my cd player Marantz the Elso clock in accordance with instruction, but don't work. It spin like crazly forwards and backwards and I don't succeed to adjust with the trimmer of the pot. I changed all components on the pcb but don't changed nothing. Anybody have had this problem ? What resoved it ? Thanks
Hi,
I, very occasionally, saw this with my Marantz CD63.
It was typically because the clock was not properly connected to the DAC (perhaps a dry joint or something).
I wouldn't suspect your clock module, but more likely the signal seen at the clock input on the DAC.
Hope this helps.
Cheers,
Phil
I, very occasionally, saw this with my Marantz CD63.
It was typically because the clock was not properly connected to the DAC (perhaps a dry joint or something).
I wouldn't suspect your clock module, but more likely the signal seen at the clock input on the DAC.
Hope this helps.
Cheers,
Phil
Try powering only the clock up first, then power up the rest of the cd player, this has fixed the same problem for me with the XO3 Tent Clock.
Cheers George
Cheers George
Thanks for replys. I removed the clock and the cd now work, finally. About power supply of clock, I may connect the clock to regulator of cd or I may make a new power supply, indipendent ? And about ground of clock, I may connect to ground of regulator ? I tried all, incluse the change of regulators, but nothing, nada de nada. I think that Elso clock don't is compatible with my cd player. Help me, thanks
Hi,
Which model of Marantz player are you using?
You say you removed the clock and it worked, I assume you had to refit the previous oscillator circuitry?
How are you attaching the clock to the CDP (i.e. where are you feeding the clock signal?)
Regards,
Phil
Which model of Marantz player are you using?
You say you removed the clock and it worked, I assume you had to refit the previous oscillator circuitry?
How are you attaching the clock to the CDP (i.e. where are you feeding the clock signal?)
Regards,
Phil
falter said:
In my case the clock was powered by it's own supply which was on continuosly by the incoming mains, the power switch on the front of the player still powered up the player as normal.
If you use the players power supply to power the clock, you will have to interrupt the rest of the player from getting voltage till the clock gets it first.
Cheers George
I refitted on the pcb the original clock soldering the caps.
I attached the clock to the leg of SAA ( cristal IN marked ).
Thanks
So, to get this straight, you removed the caps from the player and fitted them to the clock PCB?
You should remove the caps from the player, but only fit the crystal in the clock module (unless the caps were 39pF and 68pF, as in the schematic - I don't know what would happen otherwise).
Not sure if that is what you have actually done. Can you confirm?
Cheers,
Phil
No, absolutly, I fiitted on pcb player the caps before removed to afford the working of player with his own clock.
Thanks
Thanks
Sorry, I'm slowly running out of ideas.
Maybe you should check the voltages around the circuit.
Be sure that you're getting +/- 5V at the correct pins of the comparator, maybe check the oscillator circuit has 5v.
You should also be able to check the output pin has a DC voltage of a volt or two as it is oscillating.
If something is missing, it might suggest a fault somewhere.
Do you have access to a scope? If so, you could look for actual signals present.
Maybe you should check the voltages around the circuit.
Be sure that you're getting +/- 5V at the correct pins of the comparator, maybe check the oscillator circuit has 5v.
You should also be able to check the output pin has a DC voltage of a volt or two as it is oscillating.
If something is missing, it might suggest a fault somewhere.
Do you have access to a scope? If so, you could look for actual signals present.
Hi phil,
I joined the v in + of elso clock to the input of 7805 regulator and the v in- to the input of regulator negative 7906. Maybe a mistake ?
Thanks
I joined the v in + of elso clock to the input of 7805 regulator and the v in- to the input of regulator negative 7906. Maybe a mistake ?
Thanks
Hi Falter,
Well, I assume that the inputs to those regulators are greater than +/-5V, probably no less than +7 and -8 (you need at least 2V overhead to regulate properly).
The Kwak clock also needs this overhead too, I think the schematic specifies 9V-15V or something.
What you should really use is the +/- 12->15v that it used to power the opamps on the analogue output to guarantee the right voltage range to drive the Kwak clock. Perhaps not the best voltage rail to use for quality reasons, but a good enough voltage to be confident about.
I think you'd be able to prove this by taking a voltmeter and checking the voltages on the comparator power pins. You should clearly see +5v on (I think pin 1) and -5v on pin 4 (better double check those pins on the datasheet, or schematic). If you don't have those voltages, there is the problem.
Cheers,
Phil
Well, I assume that the inputs to those regulators are greater than +/-5V, probably no less than +7 and -8 (you need at least 2V overhead to regulate properly).
The Kwak clock also needs this overhead too, I think the schematic specifies 9V-15V or something.
What you should really use is the +/- 12->15v that it used to power the opamps on the analogue output to guarantee the right voltage range to drive the Kwak clock. Perhaps not the best voltage rail to use for quality reasons, but a good enough voltage to be confident about.
I think you'd be able to prove this by taking a voltmeter and checking the voltages on the comparator power pins. You should clearly see +5v on (I think pin 1) and -5v on pin 4 (better double check those pins on the datasheet, or schematic). If you don't have those voltages, there is the problem.
Cheers,
Phil
Hi Phil,
I checked the voltage only on some points of clock pcb and on the regulator ( 7805 replaced with lm340 and 7905ct ). The votage on lm 340 between input and gnd is 8.61 and on 7906 is 8.56. To get to the bottom of question, this are insufficient to power Elso clock so I would join the clock to 7815 and 7915. Isn't it ?
And this is the fault of crazly spinning of player ?
The measurement of comparator voltage ( pin 1 and pin 4 ) must been maked between pin and gnd ? Thanks and regards
I checked the voltage only on some points of clock pcb and on the regulator ( 7805 replaced with lm340 and 7905ct ). The votage on lm 340 between input and gnd is 8.61 and on 7906 is 8.56. To get to the bottom of question, this are insufficient to power Elso clock so I would join the clock to 7815 and 7915. Isn't it ?
And this is the fault of crazly spinning of player ?
The measurement of comparator voltage ( pin 1 and pin 4 ) must been maked between pin and gnd ? Thanks and regards
Not sure myself if this is high enough, so the best thing to do is check the voltage on the comparator pins (you're right, compare each pin to ground).
If your comparator doesn't have a high enough power voltage, it won't output a clock signal (there is a minimum voltage that it will work with). If there is no clock signal going into the CD player, it is likely that the CD will spin quickly.
I think you should use the outputs of the 7815 and 7915 because you'll benefit from double regulation, and it will definitely be a big enough voltage for the 431s on the Kwak clock to create +/-5v for the rest of the clock circuit.
If your comparator doesn't have a high enough power voltage, it won't output a clock signal (there is a minimum voltage that it will work with). If there is no clock signal going into the CD player, it is likely that the CD will spin quickly.
I think you should use the outputs of the 7815 and 7915 because you'll benefit from double regulation, and it will definitely be a big enough voltage for the 431s on the Kwak clock to create +/-5v for the rest of the clock circuit.
I sent the clock to Elso in repair. As soon as he'll send again to me, I'll check to join to 15 v regulators. In time: what regulators can be utilize instead of 7815 and 7915 ? Thanks
Sorry we couldn't get it fixed. Never mind. It will be working soon.
I am slowly learning that there is a huge world out wrt to regulation.
The set up Elso used is based on using 78xx and 79xx as a pre-regulation stage, the second stage being a transistor bypassed lm431, with a pi filter in between. Its pretty good as it is.
You could improve the regulation stage on the player if you like, maybe find a drop in replacement for the 78/9/xx (lm317/337 etc would require extra components and would not help too much as its preregulator).
My latest clock is a variant of Elso's. Its single power rail, and is using a just a 7805 and its own transformer. Before anyone baulks at the 7805 - it is deliberate as it should force me to investigate regulators more so I can replace it).
Perhaps it could of used dual rails, but I was trying to make it smaller.
However, it does work quite well.
Anyway, good luck when its fixed.
Cheers,
Phil
I am slowly learning that there is a huge world out wrt to regulation.
The set up Elso used is based on using 78xx and 79xx as a pre-regulation stage, the second stage being a transistor bypassed lm431, with a pi filter in between. Its pretty good as it is.
You could improve the regulation stage on the player if you like, maybe find a drop in replacement for the 78/9/xx (lm317/337 etc would require extra components and would not help too much as its preregulator).
My latest clock is a variant of Elso's. Its single power rail, and is using a just a 7805 and its own transformer. Before anyone baulks at the 7805 - it is deliberate as it should force me to investigate regulators more so I can replace it).
Perhaps it could of used dual rails, but I was trying to make it smaller.
However, it does work quite well.
Anyway, good luck when its fixed.
Cheers,
Phil
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