Crown MARCO-TECH 5000VZ - Front End Signal Path Theory

FRONT END THEORY
Thefront-end portion of the over-all block diagram has been exploded in the diagram below. Once again, only channel
1 will be discussed in detail. The Balanced Gain Stage circuitry is shown at the bottom.
MA-5000VZ FRONT END:
(CHANNEL 1 SHOWN)
/i KXDRIVER/
^ INTEGRATOR
Torac — ¿^
DISPLAY ^ ^Sx.
CACT
COMPRESSOF
DEVICE
BALANCED
INPUTS
FXQ Q ¿
fy • .:,.-.• i
1 -«— INTEGRATOR ^-O^O^QyT ^QtmOL*
. LEVEL |\ CONTROL ^\ u .*r
BALANCED ERROR AMP
GAIN STAGE
.775VO (
1.
SEI
S
R1OO
4.99K
R1O1
4.99K
^ VOLTAGE _. . „ .
TRANSLATOR ~ *" LVA
I
ODEP
3¡
VOLTAGE
1 O >O— LCH 1 - TRANSLATOR ~"~ LVM
26dB \ ^^>
JQITIUITV VARIABLE
JSITIVITY GAiN STAGE
WITCH OIAUK
4 t '1
o ií(< <^T MA-5000VZ Balanced Gain Stage. Compression device
i — —^ ^ shown across ¡nputs shunts input dependent upon error
U103 signal and front end level.
VTL5C2
| R371
R370> 51K
47K y
< C1O2
I 82PFH
-=Lr R106 ''
R102 10K
4.99K 1
+ 15V
A 0 C151
R1O4 oMR-iT> O.1
_L_ R105 > 8 ~
— o in-a 5QPK I 2 ^^*-
H1 O3 r * _ "v,^^
4.99K o J>
C101 4 S1,50
x 62pF< R107 II °-1
i— \r\r\ ~~^ < 1OK ¡I I
4-30pF < 1 Ó
Circuitry
, \o Level
/ Control
C1O3
15O
, 25V NP
•
16-MA-5000VZ