Tektronix 2445A - Page 34

Theory of Operation-2445A/2455A Service
FRONT-PANEL
ROW, COL,
CO (CONTROL DAT A)
CONTROLS
AND ANAL06
SI&NALS
þÿ”T AND þÿ”V
ANAL06
REFERENCE VOL T A&ES
AND
DI&ITAL
CONTROLS
FRONT-PANEL
LED DATA
INDICATORS
MPU
ROM
RAM
MPU BUS
CH 4 IN
CH 4 SI&
CH 3
CH 3 SIS
ANS
CH 3 IN
CH
PREAMP
,--
0
r.M 4 TRIS PICKru:'F
CH 3 TRIG PICKOFF
CH 3 GAIN
AUXILIARY
CH 4 SAIN
CONTROL
RESISTER IN[
0
CH 2
CH 2 OUT
ATTENUATOR CH 2
ANO
PAEAMP
CH 2 SI&
MA& LATCH
CH 2 IN
RELAYS
0
~
0
CH 2 TAI&
-
PICKOFF
AU
t
co
co
CH 1
+
ATTENUATOR
CH 1 SIS
ANO
MA& LATCH
CH 1
RELAYS
PAEAMP
CH 1 TRI& PICKOFF
CH 1 IN
~
0
0
A12
LOW-VOLTAGE
LINE 160 Htl
POWER
SUPPLY
•
0~
TO ALL
- CIRCUITS
-
Figure 3-1. Instrument block diagram.
3-2