[sdiy] Juno 60 woes

[Richie Burnett]

On Panel Board B, Check for...

4 MHz clock signal on pin 1 of IC26 (TC40H393P),

2 MHz clock signal on pin 3 of IC26 and also pin 20 of IC24,

500 kHz clock signal on pin 5 and pin 13 of IC26,

31.25 kHz clock signal on pin 8 of IC26,

Periodic low pulses on pin 4 of IC27 (TC40H002P),

Also check the voltage at pin 21 of IC24 relative to ground (pin4 same 
chip.)

See bottom left corner of PANEL BOARD B schematic in Juno 60 Service Notes. 
The circuit seems to mostly relate to the DCB interface, but appears to be 
where the main CPU board processor's interrupt signal is being generated, 
(or not being generated in your case.)

Hope this helps.  Good luck,

-Richie,

-----Original Message----- 
From: Jack Jackson

OK so I tried bending up the int pin on the CPU and then inserting the chip 
so the INT pin is not connected. Now I appear to get a signal and some 
control of the parameters but only one frequency (one voice) and it stays on 
but I only hear this when i either press a key and then tap the INT pin with 
my finger, or move the bender and tap the INT pin.

Any ideas?