Search found 11 matches

by Tiltrelia
Sun Jan 05, 2020 1:31 am
Forum: HELP!
Topic: JX-8P Displays "Roland JX-8P 12"
Replies: 5
Views: 2586

Re: JX-8P Displays "Roland JX-8P 12"

Good News! This 8P came back to life after replacing D2 and D3, Q3 and Q4. There was also some minor trace damage, and I noticed this board was not identical to the schematic. Oh well, problem solved and all this 8P needs now is a FIP coil for its display.
by Tiltrelia
Fri Sep 27, 2019 9:52 pm
Forum: HELP!
Topic: JX-8P Displays "Roland JX-8P 12"
Replies: 5
Views: 2586

Re: JX-8P Displays "Roland JX-8P 12"

Unfortunately anytime I replace Q3 or Q4 they seem to fail instantly. I guess I don't understand what could be causing this to happen. I'm beginning to loose hope for this 8P :(
by Tiltrelia
Fri Sep 20, 2019 9:05 pm
Forum: HELP!
Topic: JX-8P Displays "Roland JX-8P 12"
Replies: 5
Views: 2586

Re: JX-8P Displays "Roland JX-8P 12"

Just revived a new pair of transistors (KSB1366GTU and KSD2058YTU) and put them on the power supply. I am now getting just a bit less that 15V out of it, and it no longer hangs, however I still need another pair for the Logic Board itself because it is now actually succeeding the countdown, it's jus...
by Tiltrelia
Thu Sep 19, 2019 2:54 am
Forum: HELP!
Topic: JX-8P Displays "Roland JX-8P 12"
Replies: 5
Views: 2586

Re: JX-8P Displays "Roland JX-8P 12"

UPDATE: I received the capacitors and rectifiers and installed them onto my power supply, same problem. I left the JX on for a minute and found the source of the smell, Q4, a transistor that runs on the 15v rail ON THE LOGIC BOARD blew up. This is the first transistor for the whole synth, so no wond...
by Tiltrelia
Tue Sep 17, 2019 12:39 am
Forum: HELP!
Topic: JX-8P Displays "Roland JX-8P 12"
Replies: 5
Views: 2586

JX-8P Displays "Roland JX-8P 12"

After transporting my JX-8P home, it just hangs on the "Roland JX-8P 12" screen. I opened it up to check the power supply and I am getting some interesting voltages. The 5v and -5v rails are reading correctly, however the 15v rail is reading +/- 6v and increases to 9v then drops to 5v, this continue...
by Tiltrelia
Sun Aug 25, 2019 11:15 pm
Forum: HELP!
Topic: Yamaha DX7 Pitch Bend not working
Replies: 3
Views: 2300

Re: Yamaha DX7 Pitch Bend not working

Well, I just replaced the factory ROM with the special edition one, and that seems to have fixed the pitch bend issue, Random!
by Tiltrelia
Sun Aug 25, 2019 12:42 pm
Forum: HELP!
Topic: Yamaha DX7 Pitch Bend not working
Replies: 3
Views: 2300

Re: Yamaha DX7 Pitch Bend not working

Unfortunately pitch bend is enabled and the range is set to 99, still nothing. As another note, when sending pitch bend info directly to the DX7 over MIDI, it has the same issue of not actually applying it to the sound.
by Tiltrelia
Sun Aug 25, 2019 12:55 am
Forum: HELP!
Topic: Yamaha DX7 Pitch Bend not working
Replies: 3
Views: 2300

Yamaha DX7 Pitch Bend not working

I recently picked up a DX7 and I have been fixing it up. Everything on it seems to work except for the pitch bend. I have inspected all connections and the pitch bend wheel itself is not the issue, as it works just fine over MIDI, so I have no idea what the issue is here. Just to restate, the pitch ...
by Tiltrelia
Thu Aug 08, 2019 9:17 pm
Forum: HELP!
Topic: JX-8P getting stuck on "Roland JX-8P 12"
Replies: 2
Views: 1281

JX-8P getting stuck on "Roland JX-8P 12"

After fixing my 8P's after touch and IC4 being bad, I transported the synth to where I planned to use it and as soon as I turn it on it got stuck on "Roland JX-8P 12." It will consistently do this whenever it is turned on, but if I pick it up and rotate it vertically, it would count down and actuall...
by Tiltrelia
Sat Aug 03, 2019 7:23 pm
Forum: HELP!
Topic: FIXED - JX8P button issues
Replies: 2
Views: 1898

Re: JX8P button issues

Thank You so much! I do not have a logic probe on hand but I checked the 10ks which were fine, and I decided to take of IC4 and swap it for IC9 which was for the Memory Cartridge Interface, and the problem went away. Now I will order a new TC40H245P for the cartridge interface as I do have a pair of...
by Tiltrelia
Wed Jul 31, 2019 4:06 am
Forum: HELP!
Topic: FIXED - JX8P button issues
Replies: 2
Views: 1898

FIXED - JX8P button issues

So recently I received a Roland JX-8P which was not working, and like many 8P's the level switch was not working, so I bridged the connections and got it working, and put a new CR2030 battery and holder in place while I had the logic board out. While I was putting the board back into it, the back si...