- 7 -
Pin Ground
Pins are respectively for B,G,R screen character display output (Note: the
blue background in this machine is produced inside OM8838)
Pin blanking signal output
Pin horizontal synchronization signal input (positive polarity)
Pin vertical synchronization signal input (positive polarity)
Pin +5V
Pin ground
Pin not used in this machine
Pins 12MHz
Pin reset 1=reset 0=general status
Pin vertical frequency identification output 1=60Hz 0=50Hz
Pin forced to AV2 when the level is changed from high to low
Pin forced to AV1 when the level is changed from low to high
Pin infrared remote signal input effective for high level
Pin factory production mode control (not used in this machine)
Pin clock line SCL
Pin data line SDA
Pin stand-by status (stand-by)
0=working status 1= stand-by status
Pin +5V power supply
[2] Memory block
PCF8594 24C04
Pin
①
+5V
Pins
①②③④⑦
Ground
Pins
②③④
Ground
Pin
⑤
Data line SDA
Pin
⑤
Data line SDA
Pin
⑥
Clock line SCL
Pin
⑥
Clock line SCL
Pin
⑦
NC not used
Pin
⑧
+5V power supply
Pin
⑧
+5V power supply
[3] Color single chip small signal processing OM8838/TDA8842
The TDA8842/8838 pin functions are as follows
Pin
No.
Sign
Function
DC voltage (V) Ground
resistance
(K
Ω
)
Remarks
With
signal
No
signal
Red pen
grounding
Black pen
grounding
1
NDIF Sound IF input
(SIF)
0 0.31
14.5 9.5
2 UDIOEXT
External sound
input
3.63
3.63 14
9.5
3 NC
Blank
0
0
8
8
4
NC Blank
0
0
8
8
5
PLLIF Loop filter of IF
phase-locked loop
2.5
3.63
1.4
9
6
IFVO IF Video output
2.6
4.08
11
9.5
7 SCL
(I
2
C) serial clock 4.88 4.88
11
7.5
22
21
23 24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
Summary of Contents for CTM6845
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