[sdiy] dead csq600

[Antonio Tuzzi]

here a capture from schematics 

http://img534.imageshack.us/img534/1765/screenshot20120313at095.png


> Hello sdiyers!
> 
> finished with a juno 106 I'm now with dead csq600.
> 
> status:
> 
> 1) power is ok
> 2) found a dead 4558 (before was outputting -6v, changing it I got back the -15v rail)
> 3) dead 4049 (clock for the sequencer: now is entering the µPD8048
> 
> a) the pin 31 should output the real clock for the SEQ (one/12th of the original 4049 oscillator) but is always HIGH
> b) the pin 2 and 3 should get XTAL from a var inductor named R49-067-333 47µH (on the parts is written r49 067  033, but is wrong!)
> 
> the coil should oscillate at 333 kHZ but I can't see the oscillation (with frequency meter and/or with oscilloscope)
> 
> I can't find any spec for the coil, have 5 pins but 4 are connected:
> 
> 1 2 3
> 4    5
> 
> 
> pin 1 and 4 to xtal pin 2
> pin 3 and 5 to xtal  pin 3
> 
> 
> in the inductor there is continuity between 1 and 3
> but not between 4 and 5
> 
> but I don't know the inner config so I'm not 100% sure is it a dead coil (this mortal coil!)
> 
> o I have to blame the inductor or the µPD8048 ? :)
> 
> thank you for great replies!
> 
> Antonio Tuzzi
>