Heathkit IO 4105 Schematic 2
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Extracted text from Heathkit IO 4105 Schematic 2 (Ocr-read)
Page 1
LG Erw'
r1
.sAJaavAc
.251-24WAC
iLD-BLD
Gnu
120/ 240
VAC
SOISOHZ
WHT arm wMY nib _{
. n
A IN NORMAL OPERATION A PULSE BLANKS THE CRT AFTER EACH SWEEP. ré'TaTéSEn A W
m
swLYcstA
c!
4 - W
5 m LEVEL 1
a SIGNAL 1: 515
31-4 :L
A RETRACEV SWEEPV (
cm BLANKED CRT UNBLANKED NE,
T .
-AMPLITUDE SET BY |NTENSITY CONTROL w
Lsrzov -MINIMUM OUTPUT LEVEL 0F
0
BLANKING AMPLIFIER
¢
, /
7W / // W a //
////////
//////
~-AMPL|TUDE SET BY OUTPUT OF BLANKING
AMPLIFIER
-- LEVEL SET BY INTENSITY BIAS CONTROL
-INT-EXT-LINE SWITCH
CAUTION DO NOT MEASURE UNLESS YOU HAVE TAKEN PRECAUTIONS TO PROTECT THE
INPUT OF THE MEASURING INSTRUMENT FOR -1050 VDC
T0 EXTT
-GENERATOR SET w A
.lV PP AND CONNECTED
THE COMPOSITE SIGNAL AS SEEN BY THE CRT. T0 EX! INPUT.
CRT 0N
AMPLITUDE SET BY INTENSITY CONTROL.
A1620 LEVEL SET BY INTENSITY BIAS ADJ CONTROL
CRT OFF
I>
<95<2
D
Page 8
Page 107
--
1- H EAT}! KIT - .7 1 -7
INTEGRATED CIRCUITS
HEATH PAHI MAY BE BASING DIAGRAM
NUMBER REPLACED WITH (TOP VIEW)
WNPUIE ' jCOMMON
4427617 pA78MGT2 nommnw COMMON
ampurE 3 CONIROL
townan-fl ' :]1NPu1
442-e1a A79MGT2 war 1mm
0011111041 3011112111
Vcc CLEAR TOG FRESH 0 6
1A 13 12 11 10 a
I "_|-'_Lg
-7, PRE ET
CLEAR L_|'Ioo o
D
443-5 SN7474N P T 0 c o
I PRESET CLEAR
1 z 3 7
CLEAR 0 1m; PRESET Q 0 GND
Rext] R
Vc: NC NC CHI Cexl im NC
14 13 12 11 10
443-22 SN74121N
1 2 3 A 5 o 7
6 NC 1x1 A2 a 0 GND