Discussion about the Korg PolySix synthesizer

Timebase is just another way to say horizontal time per division, which 
you are adjusting.   BTW, your scope probably has an adjustment called 
"trace rotation".  Usually a hole where you poke a small screwdriver to make
the trace level instead of sloped like yours is.

I am not sure what to tell you.   Your pictures show that nothing much is happening.
You should cycle power after switching into test mode.  I assume that you did that.
If the CPU was hung up in the main loop, and then you change the switch, it might 
have no effect.

If reset is high, and not glitching low, and the oscillator output pin has a decent 
square wave or something close to it at 6 MHz, with good logic levels like 0 and 4V,
then the CPU should be running, and a lot more should be happening.  Did you check 
the power and ground pins to the CPU?   That would have been the first step.   I forget
to suggest that. Pins 40,26,5, 20, and 7 should all be checked with your scope since you
have one.  And check the oscillator output pin with the scope to insure a good main 
clock to the CPU.  I think that is pin 2 (not the pin that you scoped earlier).  

Bob

--------------------------------------------
On Tue, 7/5/16, noddyspuncture@hotmail.com [PolySix] <PolySix@yahoogroups.com> wrote:

 Subject: Re: [PolySix] Another P6 with all LED's lit....
 To: PolySix@yahoogroups.com
 Date: Tuesday, July 5, 2016, 10:17 AM
   
       
       I made a typo Bob... that should be 4.67v and 4.72v
 (not 7.72v) on IC27 pin1...!
 Cheers,Tom
 
 
 ---In PolySix@yahoogroups.com,
 <noddyspuncture@...> wrote :
 
 Hi
 Bob,
 I made two more
 photos... of the DAC (IC27 pin1) and the T0 at the same
 time.
 Dual trace,
 scope set to 2v and using DC trigger and tweaking the level
 until the waveforms showed up. There is only one spot on the
 level control where they show, it's quite
 critical.
 There are
 two shots... one at 1uS time div and one at 50uS time
 div.
 Switching the
 test mode switch doesn't make any difference to these at
 all.
 On my scope I
 cannot find any 'horizontal timebase' switch so I
 couldn't do that part... and the slope +/- switch
 didn't seem to do much either, it only seemed to change
 the brightness...!
 I
 also measured the voltages on these pins with my meter -
 IC27 pin1 has 4.67v in normal and 7.72v in test modes. The
 T0 pin1 has -9mV
 Is
 this info any good...?
 CheersTom