21
5. WIRING CONNECTION DIAGRAM
KEY BOARD
6. Circuit Explanation
1
、
Microprocessor and Small signal processing: super monolithic integrated circuits
：
TMPA8873PSCNG
TMPA8873PSCNG is an integrated circuit decoder, containing intermediate image
amplifying, horizontal and vertical scan, small signal processing, color decoding,
I
2
C bus control.
Information introducing functions and testing data for maintenance is listed in
Table 1.
Table 1
SYMBOL PIN
Working
Voltage (V)
Ground Resistance
(
Ω
)
DVD_OPEN 1
0.8
36.4M
SWA 2
0.04
12.8K
KEY 3
4.94
19.4K
GND 4
0.004
0.4
Ω
RESET 5
4.92
5.5K
X-TAL 6
2.17
33.3M
X-TAL 7
2.01
32.7M
TEST 8
0
0.6
Ω
+5V 9
4.94
2.8K
GND 10
0.003
0.6
Ω
GND 11
0.003
0.7
Ω
Summary of Contents for HTR20-A
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