System Block Diagram - Scully 280B Series Instruction And Maintenance Manual

6-2
Model 280B
Theory of Operation
SQUELCH
r-------- ­ - ­ ,
I
REC LIGHT
I
~----------
- - '
LOGIC
REC STATUS
+25V~~--~~ .------~--~
+
2 5 V ' -___
+_-----,
PL AY BACK r
~.::>R,----.,6__o , 7-+---1f___j
HEAD
~
5 '
POWER
SUPPLY
- 40 V
'--r---'
UN REG
117
VAC
.i
SYNC:
+25V
-25V
REL
PLAY 3
EQ 2
tJll
LINE IN ' - - - -......
--1'
+25V
PLAY
0
CAL
~ER
IlLUM
+-25V
BIAS
ADUST
SQU ELCH FUN CTI ON
TIMING CIR CU IT
FRONT
PANEL
AGC
t
2009328
Figure 6-1. System Block Diagram