TOVIS P/N
MTG-1972XN
DATE
2002.03.11
REV NO.
0
TOVIS
Color Monitor Service Manual
PAGE
21/30
8. DESCRIPTION OF CIRCUIT OPERATION
8-1. Mode control
8-1.1. H-Sync is inputted to pin 30 of IC601, V-Sync to pin 29 of IC601 for
each mode, and pin 27, 26 of IC601 output always-positive polarity
sync.
8-1.2. The outputs from IC601 are as below (See Table 1)
Frequency
Range of Frequency
OUT PUT (MCU PIN)
No.
Hf
KHz
Vf
Hz
Resolution
Hf
(kHz)
Vf
(Hz)
CS3
38
CS2
39
CS1
40
SUS-
4
1 31 70 720x400 28
∼
32.9
68
∼
72
L L L H
2 31 60 640x480
"
58
∼
62
L L L H
3 35 86 1024x768 33
∼
35.9
84
∼
88
H L L H
4 38 75 640x480 36
∼
40.9
73
∼
77
H H L H
5 38 60 800x600 36
∼
40.9
58
∼
62
H H L H
6 47 75 800x600 41
∼
51.9
73
∼
77
H L H H
7 48 72 800x600
"
70
∼
74
H L H H
8 48 60 1024x768
"
58
∼
62
H L H H
9 53 85 800x600 52
∼
61.9
83
∼
87
L H H H
10 56 70 1024x768
"
68
∼
72
L H H H
11 60 75 1024x768
"
73
∼
77
L H H H
12 64 60 1280x1024 62
∼
70 58
∼
62
H H H H
13 69 85 1024x768 62
∼
70 83
∼
87
H H H H
14 - -
-
H
≤
10
NORMAL
X X X L
15 - -
-
NORMAL
V
≤
40
X X X L
16 - -
-
H
≤
10 V
≤
40
X X X L
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