rock-ola 490 help needed

[bikerman]

I have a rock-ola 490 that only will play the 200 series of selections. the microswitch clicks, but does select the 100. where should i start looking?

[DRebber]

I would start with the alternating switch just under the gripper and trunion assembly.  Even if it clicks when passing home position, it may not be making solid contact internally.