125V Over Current Protect - Toshiba 1997 G Series Troubleshooting Manual

12. +125V Over Current Protect.

The current sensing resistor, R470, is in series with the
+125V supply.
If the supply current exceeds a certain level, the increased
voltage drop across R470 causes shut down to take place.
During normal operation, the voltage drop across R470
is approximately 0.5V. The turn on surge voltage drop
is approximately 1.5V.
If the voltage across R470 exceeds about 1.8V, shut down
will occur.
Figure 24. +125V Over Current Protect.
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JRS 12-97