[sdiy] dead csq600

[Antonio Tuzzi]

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