Let me begin by wishing you all the very best for the New Year. Yesterday my spare parts arrived from an excellent company called Premier Organs in the UK. The owner Lynne has been super helpful. Today I installed the DRV pcb and suddenly I have all the lights and buttons working. Next came the ...

Hi there team, I have now located spare parts from a company in the UK. They have offered the complete boards . I am hoping they arrive before Christmas but I have to say I am very confident now about the repair being completed and it should leave some spares for the future if needed. I will keep ...

Hi everyone. I have finally found the second fault on my HS-5 organ. IC2 M50726 (XB827003) is faulty. I checked all switches and leds attached IC2 and no fault so I then swapped over IC2 and IC3. I refitted the RRDY transistor for IC2 and removed the same for IC3 Everything on IC2 now works. I need ...

I will check for those signals this morning. All leds are off for IC1, IC3 and IC3 and the switches are being scanned but no data is transfered.

Today I disconnected the RRDY signal at CN1-2 and checked that RRDY was hi at IC4 and it was Hi. Reconnected and removed TR1 and test....no change. Refit ...

Thanks for your ideas. I had already checked TR1,TR2,TR2 on the DRV pcb. I did in fact pull all three of them from the board and some of the desk lights came on but not as they should have. Now I have the pedal board disconnected and the U and L keyboards I will try again looking at the RRDY line.

Today I have been checking signals from IC4 MI-1 interface to the DRV pcb. I have as follows
/TXREQ LO no activity
RRDY LO no activity
SD LO no activity
SCLK HI no activity
/MIC HI no activity
Does anyone have ideas about how DRV board might start up? Does it start with something sent to DRV and ...

Today, I am happy to bring you some good news. I spent time today looking around IC4 MI-1 interface and noticed pin 34 was always lo. whereas pins 36,35,33,32,31 were all hi. When I disconnected the pedal keyboard at CN3 the upper and lower keyboards have started to work. I think that goes some way ...

$5943 and $6618 are appearing in the LA trace as shown. Now looking for $6CCF

Sorry about my misunderstanding. I will check for JSR $6618 at $5943 later tonight and report the results.

I must have been trying to hard and to late yesterday because today I started again going through the interrupt sequence and yes $4576 is there and happening frequently.I will check the timing of it and add it on after.
Interrupt starts at $2038 then $3d8C and finally $4576 A9 and ending at $45AA ...

I have just rechecked and $4576 never appears in the trace. I also checked IC1 pin1 and there is no output from timer 1. Am I correct in looking at pin1?

I have just been rechecking $4576 and it is not appearing , neither is $3D8C but $2038 is and is occurring frequently. I will try to look at the ...

You are correct about the address $5940. It is appearing frequently in the code. Do you need me to check the time between calls or is it enough that they are called?
The second address of $4576 has never appeared. I will check IC1 pin1 for output (output of timer 1) and will post a reply shortly.

While still reading address and data from IC6 ROM1. I have found what the CPU is during during the data quiet spells. It is accessing the Rhythm Generator IC3 Bank Select Pin 37 marked as /CTO in the trace it is marked in violet as PB which is the signal from IC13 ADEC. Yes I do see that this fault ...

I am still working at trying to find useful info from the LA and have moved further into the time scale to get past all the initialise steps. At 941mS from boot there is a large loop which repeats infinitely. Some of the code it's executing is in T941.67.xlsx. I will add more to complete the loop. I ...

I have quite a lot of that sort of stuff left over from my working days. I really liked those turret socket ones. I have a lot of the 40 pin strips with the same sockets in. At the moment I am generating a new spreadsheet with Address/data and the /RD/WR lines. It just takes a bit of time. This new ...