Grass Valley Maestro Master Control Installation v.2.4.0 - Manual (Page 80)

80 MAESTRO Installation and Service Manual
Section 2 — Installation Planning
Figure 30. Example of Customer-supplied Indicator Circuit (Top Left) and Portions of Processor
Alarm Circuit
REAR PANEL BNC
EXTERNAL CIRCUIT
(EXAMPLE)
NOT TO EXCEED
24 VDC @ 20 mA
PROCESSOR BOARD
(FRONT EDGE OF PCB)
REAR PANEL
2
1
DS15
2
1
R568
2
3
1 Q17
2
3
1 Q18
R567
2
3
1 Q19
4
6
3
1
U20
151-5001-00
MMBT3904
ALARM_N
PS2702 SOT23_BEC
MMBT2222
151-5021-00
151-5001-00
0603
150
156-6534-01
SO6P4
SOT23_BEC
ALARM+
ALARM-
SOT23_BEC
MMBT3904
321-5432-00
100K
0603
ALARM_VCC
0805
RED
65-040422-012
8384_39