Search found 5 matches

by micjax53
Thu Feb 07, 2019 8:39 pm
Forum: HELP!
Topic: ESQ1 no response from panel buttons
Replies: 8
Views: 2499

Re: ESQ1 no response from panel buttons

Yes, they are on pin23 of the IC.
by micjax53
Thu Feb 07, 2019 5:41 pm
Forum: HELP!
Topic: ESQ1 no response from panel buttons
Replies: 8
Views: 2499

Re: ESQ1 no response from panel buttons

The display micro U9 has been replaced by Dr B's substitute. U9 micro on the mainboard is passing keyboard signal, I can see SACK going low when keys are pressed, however there are no pulses when buttons on the keypad are pushed. There are pulses going in on pin23 and out on pin24. The only serial s...
by micjax53
Thu Feb 07, 2019 1:55 am
Forum: HELP!
Topic: ESQ1 no response from panel buttons
Replies: 8
Views: 2499

Re: ESQ1 no response from panel buttons

Since the keyboard is working, I thought the keyboard controller IC9 was working and the DUART was seeing pin10 KEYOUT and sending data. On the DUART, the Reset port is Low, the Chip Enable is clocking, RW and WE are also clocking.
by micjax53
Thu Feb 07, 2019 12:36 am
Forum: HELP!
Topic: ESQ1 no response from panel buttons
Replies: 8
Views: 2499

ESQ1 no response from panel buttons

Unplugging serial data cable at mainboard, display shows buttons are working, but plugging back in, display is frozen and can't soft reset. Power supply voltages are correct, keyboard is working, output is good. Replaced DUART IC, but still have same problem. DSP IN signal to display board from main...
by micjax53
Thu Dec 27, 2018 7:17 pm
Forum: General Synthesizers
Topic: KAWAI K5000 Cool Blue LCD!
Replies: 75
Views: 70282

Re: KAWAI K5000 Cool Blue LCD!

I believe the EL drive xsistor on the power supply board is Q3.