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Old 19th March 2007, 08:40 PM   #6031
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Somewhere along the way you've lost the clock signal to the decoder (SAA7***). It could be as simple as your clock (if aftermarket) being slow to start-up.
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Old 19th March 2007, 08:52 PM   #6032
Thomo is offline Thomo  United Kingdom
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Hi Martin. The only coax I ran was from u100 on the rf board to r501 on hf circuit. Should be very simple.....

The first time I did it the disc span madly. So I changed the rf board for another and it worked again. So obviously I had to have another go. Same thing happened.

I am now stuck!

Lee.
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Old 19th March 2007, 09:15 PM   #6033
avr300 is offline avr300  Denmark
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AD8599 coming up. Let see whether this is more long-term interesting than the LM4562.
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Old 19th March 2007, 10:24 PM   #6034
Glenn2 is offline Glenn2  United Kingdom
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Quote:
Originally posted by Thomo
Hi Martin. The only coax I ran was from u100 on the rf board to r501 on hf circuit. Should be very simple.....

The first time I did it the disc span madly. So I changed the rf board for another and it worked again. So obviously I had to have another go. Same thing happened.

I am now stuck!

Lee.

Well it looks like you took it from the right place... though it's easy to have a strand of the braid touching something. Check the resistance between HF and ground.

The only thing I will say at this point is you should only ground the coax at one end. If you ground it at both ends, any potential difference in the two grounding points may cause ground currents to flow in the shield.
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Old 19th March 2007, 10:54 PM   #6035
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Quote:
Originally posted by Thomo


This is the best I can do....

Also, there are a couple of links on the board before the toroid. You should defo check these to make sure they match the ki board.

I THINK I removed u247 & added u248. u249 should be in as should: u242 to u246.

Just compare the boards closely...

Lee.
Thanks a lot, this picture is quite clear (although it seems to be of another player?) Several colors differ but all the different windings (and therefore voltages) are the same.

I've checked al links between the 220 connexion and the TX, they are the same, I measure 220 volts at the TX I've also checked the two fuses, measure 9 volts at both sides of 'em.

* I still measure arround 29 volts at U311 and U312, can anybody confirm that this is correct, or?

* At which other points can / should I meassure voltages to check?

Please help me out, I miss my music
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Old 19th March 2007, 11:43 PM   #6036
Glenn2 is offline Glenn2  United Kingdom
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Quote:
Originally posted by Paulus1981


Thanks a lot, this picture is quite clear (although it seems to be of another player?) Several colors differ but all the different windings (and therefore voltages) are the same.

I've checked al links between the 220 connexion and the TX, they are the same, I measure 220 volts at the TX I've also checked the two fuses, measure 9 volts at both sides of 'em.

* I still measure arround 29 volts at U311 and U312, can anybody confirm that this is correct, or?

* At which other points can / should I meassure voltages to check?

Please help me out, I miss my music

Check for AC between those two points. They are the VFD heater supply. Check D851, D852 and D854. (Short=dead.) Try to measure what's going into Q851 and coming out. (7918 reg). There should be about 24-25v coming out as there is a 6.8v zener lifting it from gnd. Careful not to short anything and blow up that nice TX!

The voltages coming out of that winding (if properly connected) should be 3.5VAC, floating at -19.6VDC. You have to be clear about what you're measuring.

If you've checked the fuses for the 5V lines are intact, what AC do you get between the two? If it's not around about 9.3V, take out BOTH fuses and measure again for the unloaded figure.

What do you get going into the op-amps?

The AC and pre-regulated DC voltages in the service manual are a guide based on the basic bog-standard transformer, not KI toroid. They may be a bit different, and also vary for someone on 220V compared to 240V, etc... The only important thing is that they are not too low as prevent regulation and not too high as to overheat the regs, VFD etc.

Good luck!
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Old 19th March 2007, 11:44 PM   #6037
Glenn2 is offline Glenn2  United Kingdom
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Sorry - missed the bit about you checking the voltages at the fuses.
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Old 20th March 2007, 08:11 AM   #6038
YoungSC is offline YoungSC  Australia
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Hello Gents,

I have returned after purchasing a CD53 from EBay to fix my 63KI Sig and guess what....it doesn't work, despite me confirming with the seller that it did and depiste him photographing an operational unit.

I received a message from him basically along the lines of, 'you bought it, too bad'.

I am going to have a try to see if I can get it to work before I report the guy (and even if I do I'll probably report him).

I have probed under the hood and have found that the 7812 and 7818 regs are right, but the 5V reg is only putting out 0.35V. The diodes before the 5V reg all have 27Vac across them. I haven't checked C813 yet, but plan to do so.

Is it likely that the reg is stuffed, or could it be something else (hopefully simple)?

Thanks,

Simon (Oz)
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Old 20th March 2007, 10:05 AM   #6039
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by YoungSC
I received a message from him basically along the lines of, 'you bought it, too bad'.
What a cheeky son of a...

I've just had a bad Ebay transaction, after years of almost nothing going wrong. Some people are just dishonest, plain and simple.
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Old 20th March 2007, 11:55 AM   #6040
Glenn2 is offline Glenn2  United Kingdom
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Quote:
Originally posted by YoungSC
Hello Gents,

I have returned after purchasing a CD53 from EBay to fix my 63KI Sig and guess what....it doesn't work, despite me confirming with the seller that it did and depiste him photographing an operational unit.

I received a message from him basically along the lines of, 'you bought it, too bad'.

I am going to have a try to see if I can get it to work before I report the guy (and even if I do I'll probably report him).

I have probed under the hood and have found that the 7812 and 7818 regs are right, but the 5V reg is only putting out 0.35V. The diodes before the 5V reg all have 27Vac across them. I haven't checked C813 yet, but plan to do so.

Is it likely that the reg is stuffed, or could it be something else (hopefully simple)?

Thanks,

Simon (Oz)
The reg could be stuffed, but more likely it's actually shutdown because something downstream has gone bad. It's not a big deal to swap it though to make sure.

This is assuming you've checked the fuses.
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