DX7IIfd won't do anything

Pulling out your hair? Don't know what to do or where to go? Ask in here.
Forum rules
READ: VSE Board-Wide Rules and Guidelines

If your Help request has been solved, please edit your first post in order to select the Image Topic Icon to let others know your topic has been solved.

Postby Maschinengeist » Fri Jun 22, 2007 5:29 pm

Hi evildragon

I don't have any motherboard in stock. I rarely keep those parts (but will someday. Another work in progress). But I'll check around and will contact my part suppliers to see if one got one available.

As for test, you can persorm a few on the ICs with a digital multimeter to make sure its in/out (among other things) are accurate. It's important to follow the pinout, otherwise you'll fry the chip. Please refer to the IC Block Diagram in the Service Manual.

You can also get yourself a basic logic probe off eBay for less than $20.

Note: the previous message was intended to dachsis. Sorry for the confusion.
-------------------------------------------------------------------
MuzikElektronix.com
Music electronics repair & More
Help? See TechZone
Parts? email!
Service Manuals?+/-2000 documents!
Sorry, they aren't free
Now on FACEBOOK: "Muzik Elektronix"
User avatar
Maschinengeist
Supporting Member!
Supporting Member!
 
Posts: 1448
Joined: Sat Jan 21, 2006 3:42 pm
Location: Sherbrooke, Quebec, Canada
Real name: Steph. J
Gear: Multimeter
Frequency Counter
Oscilloscope
Signal Generator
Logic Probe
and more stuff
Band: Cybernetik

Postby evildragon » Fri Jun 22, 2007 5:31 pm

ok, i'll give those tests a shot then with my multimeter when the problems creeps up again... (continuity test, correct?)

i'm also going to find an in-circuit cap tester too..
evildragon
Newbie
Newbie
 
Posts: 27
Joined: Sun Jun 17, 2007 6:47 am

DX7IIFD won't do anything

Postby dachsis » Fri Jun 22, 2007 6:27 pm

evildragon wrote:ok, i'll give those tests a shot then with my multimeter when the problems creeps up again... (continuity test, correct?)

i'm also going to find an in-circuit cap tester too..


on IC s you are ckg the in/out values, right ?
thanks for the serv contact, these are invaluable.
No more old Yamaha serv shoppes to buyout and reap bounties.
dachsis
Newbie
Newbie
 
Posts: 9
Joined: Thu Sep 30, 2004 7:16 pm
Location: Sun City, AZ
Gear: AllDXseries mach,60jan08),QS w/piano,(2) SY77, SY88, CS2x, PSR 6300, PSR2700,PSR550, YGP525,55c,(2) TX816, TX416,(2)TG500, Alesis1600 Mxr,QvbIV, etc

Postby evildragon » Fri Jun 22, 2007 6:54 pm

http://blackevilweredragon.spymac.com/dx72.jpg

http://blackevilweredragon.spymac.com/dx73.jpg

one of the IC block diagrams.. im actually curious which in and out too... i've never messed with logic gates before (i've wanted to learn)
evildragon
Newbie
Newbie
 
Posts: 27
Joined: Sun Jun 17, 2007 6:47 am

Postby Maschinengeist » Fri Jun 22, 2007 9:17 pm

VCC = Supplied Voltage = Positive

VSS = Supplied Voltage = Negative

After that, it's only a matter to follow the schematics, indicating the in and the out of the pins.

More than a continuity test, it's a (basic but efficient) way to narrow down what part of the chip is bugging down.

PLEASE RESPECT THE POLARITY AND PAY EXTREME ATTENTION TO THE PIN CONFIGURATION OR YOU'LL FRY THE CHIP AND QUITE PROPABLE DAMAGE THE SYNTH IN AN UNPLEASANT WAY.

Good luck!
-------------------------------------------------------------------
MuzikElektronix.com
Music electronics repair & More
Help? See TechZone
Parts? email!
Service Manuals?+/-2000 documents!
Sorry, they aren't free
Now on FACEBOOK: "Muzik Elektronix"
User avatar
Maschinengeist
Supporting Member!
Supporting Member!
 
Posts: 1448
Joined: Sat Jan 21, 2006 3:42 pm
Location: Sherbrooke, Quebec, Canada
Real name: Steph. J
Gear: Multimeter
Frequency Counter
Oscilloscope
Signal Generator
Logic Probe
and more stuff
Band: Cybernetik

Previous

Return to HELP!

Who is online

Users browsing this forum: No registered users and 7 guests