Tektronix DC 502 - Page 29

U 2 GOA
U2GOB
SEGMENT DECODER
FHOM P
UIUO
5v
i R2U4 RX<^>
S S.GR S.GIC
x Z5B
E*T SCAN ~ ---
+ 5V
U2GOD
+»v
U24C»B
U2GOC
UlfeOA
U2¾5
47- m F
R284
U2 37
U254
U2G7A
U2¾4
U24O
U25G
U2G7C
MS P
U24IA
BOARD
display
tR-Bä,}
CR244
CLEAR
U245A
OVERFLOW REGISTER.
P/O AI MAIN BOARD
C ounters and D isplay
DC 502
A4 P20TSCTION
circuit board
47 a , F
2OV
IO VOLTS
(.USA)
5.Z VOLTS
(REG,}
4'
SEE PARTS UST FOR EARLIER
VALUES AND SERIAL NUMBER
RANGES OF PARTS MARKED
WITH BLUE OUTLINE.
---------- X DECI MAL
28B P oint
U2G2A
FROM PIM S
U222*
CRE«i)
OtoAS P (LE- scaler , bd
+ 5 VOLTS
(RE«.)
+ 5 VOLTS
(REG)
4-S VOLT«»
(REG,-)
U24IB
U25O
LEADING ZERO SUPPRESSION
U24GA
UNTERS
&
DISPLAY
S eries P ass
( located in mainframe )
U24GC
8_
4
UZ(,7F
ffo az display B oard
?2 CRMI
R.28ON
%oo
300 Q284
IGHT
OUTPUT
I¾B ^> OVERFLOW
DISPLAY LEDs