Kohler 48RCLB / 60RCLA — LED Optic Board Test Procedure
Testing & diagnosis · Alternator LED optic board / FRX activator board
For the Kohler 48RCLB / 60RCLA, from the Kohler service manual.
Applies to: Kohler 48RCLB, Kohler 60RCLA, Kohler KG6208 engine
Before you start
- Testing the photo transistor circuit board. Hazardous voltage will cause severe injury or death. Do not expose the photo transistor board to external light.
- Disconnecting the electrical load. Hazardous voltage will cause severe injury or death.
Procedure
- Remove the enclosure rear panel from the generator end.
- Remove the LED optic board and holder.
- With the generator running at no load, shine a flashlight at the exposed photo transistor.
- Observe AC output voltage; high output indicates the FRX activator board is functioning, and voltage should drop when the flashlight is removed.
- If high voltage exists with the flashlight off, stop the unit and tape over the photo transistor; restart to check for external light.
- With the generator running at no load, approximately 1--2 volts DC should be observed at 3B (+) and 5B (--) at the LED optic board.
- Shine the flashlight; the DC voltage reading should drop.
- Stop the generator set.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Approximately 1--2 volts DC at 3B (+) and 5B (--) at the LED optic board
Full service-parts list: Kohler 48RCLB →, Kohler 60RCLA →
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.