Changhong Electric PF2939, Service Manual, Page: 24 / 47

SERVICE MANUAL
30 Ground 2 for TV processor 0 0 0
31 Narrow band PLL filter or AGC sound IF 2.32 4.17 2.64
32
Automatic Volume Levelling / sound IF input /
subcarrier reference output / audio
deemphasis
0
.034
3.68 2.73
33 Horizontal output 3.1
4
6.26 2.64
34 Flyback input/sandcastle output 0.75
4.98 2.78
35 External audio output / QSS intercarrier out
3
.
7
0
3.84 2.68
36 EHT/overvoltage protection input 1.4
3
3.82 2.79
37 IF-PLL loop filter 2.43 4.83 2.79
38 IF video output / selected CVBS output
3.33
3.40 2.79
39 Supply voltage TV processor 8.1 1.54 1.48
40 internal CVBS input
3.87
4.71 2.86
41 ground for TV processor 0 0 0
42 CVBS/Y input 3.
71
4.74 2.86
43 C input 1.55
4.91 2.88
44
Audio output/AM audio output (volume
controlled)
3
.4
5
5.07 2.82
45 2nd RGB / YUV insertion input 1.6
8
4.68 2.84
46 2nd R input / V (R-Y) input / PR input 2.5
5.04 2.86
47 2nd G input / Y input 2.5 4.88 2.82
48 2nd B input / U (B-Y) input / PB input 2.5
5.04 2.86
49 Beam current limiter input
2.59
4.62 2.73
50 Black current input / V-guard input
6.25
5.07 2.82
51 Red output 2.
90
3.76 2.52
52 Green output 2.
92
3.76 2.52
53 Blue output 2.
93
3.76 2.52
54
Analog supply of Teletext decoder and digital
supply of TV-processor (3.3 V)
3.2
8
0.66 0.66
55 OTP programming voltage 0 0 0
56 Digital supply to core (3.3 V) 3.2
9
0.66 0.66
57 Oscillator ground supply 0
.036
0
.02
0
.02
58 Crystal oscillator input 1.
60
4.38 2.11
59 Crystal oscillator output 1.
70
3.64 2.10
60 Reset 0 0 0
61 Digital supply to periphery (+3.3 V) 3.2
9
0.66 0.66
62 Port 1.0 or external interrupt 1 input 0.03 6.63 2.38
63 Port 1.1 or Counter/Timer 0 input 0.03 3.51 2.47
64 Port 1.2 or external interrupt 0 input 4.
662
6.64 2.56
22