JVC 340 SC - Manual (Page 53)

Chapter 2—Functional Description
Model 330, 340SC and 370SC Service Manual 2-41
Interlocks and Shutdowns
Input
HSENSRED - Used to shut down the CRT beams in the event of horizontal sweep
failure.
HSENSGRN - Identical to HSENSERED.
HSENSBLU - Identical to HSENSERED.
Output
/SWEEPOK
Indicates whether or not all sweeps are occurring at or above a minimum frequency.
Used on the VPB to turn off the signal in the event of loss of sweep.
Internal
None