JVC Model 200 - Manual (Page 64)

Chapter 2---System Description
+80 V + 80 V supply for use by the switching supply of horizontal deflection
amplifier
Interlocks and protection:
Input
None
Outputs
H_LOCK + and H_LOCK-: Used to shut down the switching power
supply of the horizontal deflection amplifier in the event of a loose
yoke or loose scan reverse connector. This prevents the power
supply section of the Horizontal/Vertical Deflection Board from
operating when 1 or more yoke connectors are disconnected.
/SWEEP_OK: Shuts down the video amplifiers in the event of
deflection failure (if DEFL_OK or /H_ENABLE are not present).
2-50 Model 200 Service Manual