Figure C–1 PTCs on the Main Logic Board
Keyboard and Mouse PTC
The keyboard and mouse PTC protects the keyboard and mouse from short circuits
or overcurrent. If you power on the system and any of the following occurs, the
keyboard and mouse PTC may be open.
4
The keyboard speaker does not beep.
4
The four LEDs on the keyboard do not flash when power is turned on to the
system unit.
4
A message is displayed on the system monitor:
No keyboard connected.
Ethernet PTC
The Ethernet PTC protects the Ethernet transceiver from short circuits or overcurrent.
If you plug the Ethernet cable into the MLB and the Ethernet transceiver LED does
not light, the Ethernet PTC may be open.
184
SPARCstation 10 Service Manual ♦ Revision A, July 1993
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