Major Circuit Descriptions - Commodore CM-141 Service Manual

MAJOR CIRCUIT FEATURES
1. Newly developed components.
Hybrid-IC type STR 470A serves the stable B
+
output against in-
put and load variations.
In application of this reliable component, the power Circuit has merits
as listed:
a No adjustment for B
+
(DC115) output IS necessary.
b. Simplification of the circuit.
c. No voltage setting against the variation of main power voltage
is necessary.
2. MSI (Medium Scale Intergrated Circuit)
This Monitor Consists of 3 MSls.
Each MSI IS prOVided with the function of the conventional circuits,
which enables
rt
to improve reliability and stability of picture quality
by reducing the number of parts and adjusting points.
3. Low Loss Vertical Output CircuIt.
The power loss In the vertical output circuit IS reduced by changing
over from high voltage to low voltage In the front and back halves
of the scanning period.
4. High voltage Circuit
FBT (flyback transformer) is multl-smgle type, that is, high voltage
rectifier diodes are connected, between high voltage windmg, and
these are sealed.
This FBT decreases the variation of picture size and reduces the
dragging of the picture. The raised high voltage improves focuss-
Ing to make picture quality better.
FRONT AND BACK VIEW
DESCRIPTION OUT GOING STATUS
DESCRIPTION
OUT GOING STATUS
1. POWER INDICATER
9. V HOLD -
2. VOLUME
10. POWER CORD
-
3 BRIGHTNESS
11. VIDEO
4. POWER SWITCH OFF
12. LUMA
-
5. TINT CENTER
13. CHROMA
-
6. COLOR
CENTER
14. AUDIO-1
-
7. CONTRAST CENTER
15. AUDIO-2
-
8. H. POSITION
-
16. SIGNAL SELECT -
-5-