Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
Search
Troubleshooting a 1000GX
|
Hello folks,
I've been around here for a very long time, and I love these machines (Better love them, I have thirteen of them). My one black sheep 1000GX has been a problem child -- first it didn't boot. I had a friend resolder the P1 connector. That got me the other common bane, black boxes fever. Back in the dark ages that meant the relay hung, so I sent my friend to the k1000.net site, but he didn't find a good picture of where that relay is. He tapped on what he thought was the recalcitrant relay, but there was no joy from that. Anyone know anything else that gives the screen black boxes? This is a non-upgraded 1000GX -- I want to get it working before I worry about finding someone to burn me an OS5 upgrade. Anyone got any ideas (other than giving it to someone so they can anchor their boat, I'm not doing that). Nicole Sent from my HAL 9000 in transit to Jupiter |
|
Not an expert on the 1000-X rack units or black box screens -but here are some things I have repaired on older synths.
?
Any EPROMs or other ICs are in sockets may have some oxidation on the pins preventing full startup due to intermittent connection.
With power removed, slowly lift IC from socket and plug it back in.? (don't even need to remove completely).
Or for best results -? remove and clean pins with isopropyl alcohol.
?
Also, the PC solder connections can crack from heat over time (hairline size) - giving intermittent or no connection.
Visually check, reheat and reflow the solder to fix.?? Could also have solder cracks (or PCB trace cracks)? if the box was dropped.
?
If these have CCFL (cold cathode florescent lamp) for LCD backlight - that could be bad.
In that case, unit will still make sounds, but the display will be dark.
I replaced my K1000 LCD with one having a LED backlight.??
There are some notes on this site describing what I (and others) have done to fix.
?
Check the backup battery voltage - replace if low.??
I had an Alesis synth with this problem, the battery voltage was around 2 volts. Unfortunately, this clobbered the SRAM chip - replaced to fix.?
SRAM chip holds the settings with battery supply when main power is off.
Digital logic and RAM like to have > 2.8 volts or zero volts, but in-between voltage? (like 2 volts) over time will cause them to fail.
?
Best of luck.
-Mike |
|
Yeah, I've got several of the modules with fading screens, but I don't use that as a method of access to the instrument because I'm blind. The cool thing is that everything up to the K2600 (and maybe the K2661) sends all front panel information through MIDI as sysex, so programs that can read this can replace the display.
toggle quoted message
Show quoted text
We checked all the chips and looked at traces. My friend also checked out all the caps -- none of them were leaking or growing fat. I'll mention the battery to him though. Nicole -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of mjkirk12 via groups.io Sent: Monday, July 29, 2024 12:10 PM To: [email protected] Subject: Re: [K1000-K1200] Troubleshooting a 1000GX Not an expert on the 1000-X rack units or black box screens -but here are some things I have repaired on older synths. Any EPROMs or other ICs are in sockets may have some oxidation on the pins preventing full startup due to intermittent connection. With power removed, slowly lift IC from socket and plug it back in. (don't even need to remove completely). Or for best results - remove and clean pins with isopropyl alcohol. Also, the PC solder connections can crack from heat over time (hairline size) - giving intermittent or no connection. Visually check, reheat and reflow the solder to fix. Could also have solder cracks (or PCB trace cracks) if the box was dropped. If these have CCFL (cold cathode florescent lamp) for LCD backlight - that could be bad. In that case, unit will still make sounds, but the display will be dark. I replaced my K1000 LCD with one having a LED backlight. There are some notes on this site describing what I (and others) have done to fix. Check the backup battery voltage - replace if low. I had an Alesis synth with this problem, the battery voltage was around 2 volts. Unfortunately, this clobbered the SRAM chip - replaced to fix. SRAM chip holds the settings with battery supply when main power is off. Digital logic and RAM like to have > 2.8 volts or zero volts, but in-between voltage (like 2 volts) over time will cause them to fail. Best of luck. -Mike |
|
Have someone check the battery voltage. Should be around 3.2 when new and 2.97; time to replace. Black squares is a contrast problem in the display. It can be replaced .
toggle quoted message
Show quoted text
On Jul 28, 2024, at 11:20?PM, Nicole Massey <nyyki@...> wrote: |
|
Black squares isn't always a contrast problem -- the key is the second click. The device clicks when powered on. Then these units run their internal tests, and if everything's okay the relay is triggered to open the connection to the output section. This is the second click -- it's a design feature to keep from hitting the speakers with noise or too much electricity at once, for systems that use a power strip or switched surge protector to fire everything up. I'm not getting that second click, telling me either something's going wrong with the self test routines or the relay isn't being triggered/acting like it should. Does anyone have any possible other steps or details about this?
toggle quoted message
Show quoted text
As mentioned before, I couldn't give a fingernail clipping for the displays, I don't/can't use them. I'll have him check the battery though. Nicole -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of fop29, via groups.io Sent: Wednesday, July 31, 2024 9:20 AM To: [email protected] Subject: Re: [K1000-K1200] Troubleshooting a 1000GX Have someone check the battery voltage. Should be around 3.2 when new and 2.97; time to replace. Black squares is a contrast problem in the display. It can be replaced . On Jul 28, 2024, at 11:20?PM, Nicole Massey <nyyki@...> wrote: |
|
What you’re describing is the delayed relay output. The relay is near the rear of the unit. It’s Orange-yellow in color. About 1 inch big. I had to replace mine for the same reason. If you tap it and it kicks in, that’s the problem. It’s a Panasonic audio output relay.
toggle quoted message
Show quoted text
Patrick On Jul 31, 2024, at 11:04?AM, Nicole Massey <nyyki@...> wrote: |
|
On the precursor to this list we predicted the price for the 100-1200 modules would go up. Back then they were selling for $100 consistently.
toggle quoted message
Show quoted text
I'll go that route if I can't get this one back up, but I feel the more of these modules still in service the better it is for music. Nicole -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Heather Boyle via groups.io Sent: Thursday, August 1, 2024 5:53 AM To: [email protected] Subject: Re: [K1000-K1200] Troubleshooting a 1000GX I noticed on ebay there are several GX1000 available for under $250. There is even one 23 button GX (very rare). This may be the easiest way to go. The 23 button GX may not even need a rom upgrade. Kind regards Heather |
to navigate to use esc to dismiss