Keyboard switch types in music gear

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.

Keyboard switch types in music gear

Postby Telcontar » Sat Dec 01, 2018 11:11 pm

As part of studying computer keyboard switches, I found that music gear—especially Roland’s—contains a number of keyboard switch types.¹ In most cases, the part numbers found in the service manuals match up with expected series names, e.g. KFL11904 and KFL10903 from the SBX-80 and TR-909 fit in with other documented evidence of KFL and SKFL series.

However, the Roland CR-78 contains something really strange: KCA10037. I found one photo from Cybercardinal (from 2012) suggesting that it resembles SCK and KCC types, but just from a teeny bits poking out from under the keycap.

Does anyone have a CR-78 to hand to pop off the Start/Stop or Measure keycap and show what switch is under it?

Photos show that the WS-1 that supported it used at least three types, not interchangeable: SCK and SKCC (compatible with each other, it seems) and KED (not compatible). Sadly I can’t find a service manual for the WS-1, so I can’t check what they called the SKCC-style switches. It seems as though it would be the KCA, but those already have SCH, KBB and KCC as apparent series names (!!!), and all model numbers found so far are SKCCxx. To also be Alps series suggests that Alps lost their mind. (I have a daft theory but that would make KCA the tall stem type, which seems wrong for the exposed switches in this kind of gear.)

I really want to see what is inside the SCK type (as used in the CR-68, CSQ-100 and CSQ-600) but System J reported that they never fail, so I am not that likely to get my hands on a broken one to pull apart!

¹(pushbuttons that have around 2–5 mm travel and ca. 50–70 cN actuation, that support 19.05 mm spacing)
User avatar
Telcontar
Newbie
Newbie
 
Posts: 3
Joined: Sat Dec 01, 2018 10:42 pm
Location: United Kingdom
Real name: Daniel

Re: Keyboard switch types in music gear

Postby Telcontar » Sun Dec 23, 2018 8:07 pm

Anyone?
User avatar
Telcontar
Newbie
Newbie
 
Posts: 3
Joined: Sat Dec 01, 2018 10:42 pm
Location: United Kingdom
Real name: Daniel


Return to HELP!

Who is online

Users browsing this forum: syntheticsolutions and 11 guests