Circuit Protection Element - Sony HDCAM HDW-F900R Maintenance Manual

1-23. Circuit Protection Element

The CNB-23 board of this unit is equipped with the
positive characteristics thermister (power thermister) as the
circuit protection element. The positive characteristics
thermister limits the electric current flowing through the
circuit as the internal resistance increases when an exces-
sive current flows or when the ambient temperature
increases. If the positive characteristics thermister works,
turn off the main power of the unit and inspect the internal
circuit of this unit. After the cause of the trouble is re-
moved, turn on the main power back again. The unit works
normally. It takes about one minute to cool down the
positive characteristics thermister after the main power is
turned off.
Board Ref. No. Address
CNB-23 THP1 A8
1-58
Protection circuit/
equipment
Internal circuit of the board
HDW-F900R/V1 (E)