15V Over Current Protect; Over Current Protect - Toshiba 1997 G Series Troubleshooting Manual

7. -15V Over Current Protect.

The -15V over current protect operates in a manner simi-
lar to the +15V over current protec circuit.
8. +35V Over Current Protect.
A +35V source is developed at the cathode of Diode
D302. The load current is carried through current sense
resistor R370. If the load current exceeds a certain limit,
the voltage drop across R370 increases and turns on tran-
sistor Q370.
Figure 19. -15V Over Current Protect.
When Q370 turns on, the collector will go high, towards
the +35V supply. This is the monitor point for shut down.
The Zener diode D370 goes into breakdown, and a high
voltage is delivered to pin 14 of Z801.
Figure 20. +35V Over Current Protect.
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