Keyboard And Piston Rail Servicing; Keyboard And Piston Rail Assembly/Disassembly; Detaching Keyboard From Circuit Board - Viscount C-440 Manual

Keyboard and Piston Rail Servicing
Detaching keyboard from Circuit Board
The model SK7 keyboards used in these instruments uses a flexible mylar cable with a carbon
paste connector on the end. The mating connector is a locking zero insertion force connector. It
must be unlocked in order to plug in or un-plug the keyboard cable. Failure to unlock the connector
prior to removing the cable may damage the cable. The cable is not replaceable. If the cable end is
damaged, contact Rodgers Technical Services.
To release the lock, pull up on the outside of the connector housing until the release mecha-
nism extends to its full height. Carefully remove the cable.
It
should require very little force.
To re-attach the keyboard, make sure the lock is up then carefully insert the cable and finally
press the lock down onto the connector.
Keyboard and Piston Rail Assembly/disassembly
To remove the keyboards:
1. Disconnect the keyboard and piston cables from the Main 110 board.
2. Remove two screws from bottom of key deck which attach the key deck to the key cheeks.
3. Remove screws from back side of key cheeks (inside console).
4. Slide keyboard assembly forward and out of console.
Two styles of piston rails may be encountered. Access to piston rail mounts in early models is
gained by removing the keyboards and then detaching the rails from the underneath side.
Later models allow servicing the piston rail from the front of the instrument. If you have
difficulty with a tight fit, you might find it more convenient to remove the keyboard assembly
anyway. In either case, when removing piston rails and/or keyboards, observe cable routing. Be
sure to properly re-route piston and/or keyboard cables to avoid damage to the cable and interfer-
ence to the keyboards.
When installing the new style piston rails with the keyboard assembly removed, loosen screws
in front of rails and the screws attaching the mounting brackets to the keyboards. This will allow
clearance between keyboard assembly and wiring busses on piston rails. Alternate between tighten-
ing the screws which mount the brackets to the keyboards and screws in front of the piston rails.
Page 14
Rodgers Instntment Corporation