Commodore 1940 - Block Diagram; General

1. GENERAL
This Color Monitor automatically scans horitontal frequencies 15.7 KHz and 27.6-31.5 KHz, and all vertical
frequencies between 47Hz and 75
Hz.
Mode switching is automatic and based on the polarity of horizontal and vertical sync and horizontal sync period.
TAA 1675A is used for vertical oscillation and deflection. Power supply circuit is a switching mode power supply
And a chopper regulation circuit is used to maintain HV and horizontal display size constantly.
2. BLOCK DIAGRAM
VIDEO INPUT
r"""'''''---''''=''''''''''''''''''''''''''''''''''''
R 0------. 1@101
G 0------. '!IDEO PRE-AMP
B 0------. . tonfrasf.co
ntr
91
IC402
0803 8
VIDEO
OUTPUT CRT
0813,0822 1-------+
DY
I SElFTEST
VER OlSC/DRIVEI
r I
I HV
RAMP GENRATOR
I
,
.
i
t
)'NC
~
MODE SWITCH
V.S
H.S
YNC
IC401
---+
0503
--+- 0504
T502
~I
HOR. AFC/
HOR.
HOR.
FBT
PO
HOR.OSC DRIVE OUTPUT
t
H. BLANKING
AC POWER IN
<Fig.2 Block Diagram>
22