Technics synthetiser SX-AX7 troubleshooting

Thread Starter

nbern077

Joined Mar 17, 2012
10
Hi,

I have a Technics synthetiser SX-AX7 (early 1990) I need to troubleshoot. I would benefit greatly from anybody having some experience with this equipement.

Current status the equipement turn on correctly but all functions, lights seems frozen.

I have scope power supply, signal and so far nothing abnormal, any ideas?

Normand
 

kubeek

Joined Sep 20, 2005
5,796
I would start by checking the power supply voltages, then check the reset lines for the dsp and aux cpu, and their clock sources. Also check the voltages on the ram and rom chips.
 

Thread Starter

nbern077

Joined Mar 17, 2012
10
I would start by checking the power supply voltages, then check the reset lines for the dsp and aux cpu, and their clock sources. Also check the voltages on the ram and rom chips.
Power supply are good: 4.8, 4.9 instead of 5v, 14.1 instead of 15V, -15.01 instead of 15V
All 4 Cristals are operating

I will check the reset lines for the dsp and aux cpu.
 
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