Compaq MV-920 - Page 62

10 Schematic Diagrams
PG17**/PG19**/PG21** 10-8
1
2
3
4
5
6
7
8
3.3
2.5
0.71
1.25
GND
2.12
11.86
4.98
2.58
2.5
0.41
1.41
GND
4.28
11.86
4.98
2.3
2.5
0
1.22
GND
5.05
11.86
4.98
pin #
MODES
31 kHz 68 kHz 91 kHz
Table 10-4. IC401 (KA3843)
Unit: Vrms
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
4.86
4.86
1.49
0
0.66
3.42
GND
11.97
2.4
2.4
11.98
11.98
GND
4.86
11.98
4.86
4.86
4.86
1.32
0
0.61
3.43
GND
11.96
3.42
3.42
11.96
11.96
GND
4.86
11.96
4.86
4.86
4.86
1.29
0
0.6
3.42
GND
11.95
3.67
3.67
11.95
11.95
GND
4.86
11.95
4.86
pin #
MODES
31 kHz 68 kHz 91 kHz
Table 10-6. IC501 (TL494CN)
Unit: Vrms
1
2
3
4
5
6
7
1.09
12.43
9.65
–13.6
0
11.56
1.09
1.09
12.28
9.65
–13.65
0
11.65
1.09
1.08
12.21
9.41
–13.65
0
11.58
1.09
pin #
MODES
31 kHz 68 kHz 91 kHz
Table 10-3. IC301 (TDA8172)
Unit: Vrms
1
2
3
4
5
6
7
8
9
10
11
12
13
14
–13.81
5.04
4.52
12.02
3.26
3.26
0.97
1.06
2.02
2.02
–13.81
NC
NC
NC
–13.65
5.04
4.44
12.02
3.26
3.26
–1.85
1.07
2.02
2.02
–13.65
NC
NC
NC
–13.64
5.04
4.41
12.02
3.26
3.26
–2.5
1.07
2.02
2.02
–13.64
NC
NC
NC
pin #
MODES
31 kHz 68 kHz 91 kHz
Table 10-5. IC403 (LM324M)
Unit: Vrms
3
230 V (Q405, Source)
CH1 P-P = 230 V CH1 RMS = 150.1 V
2
10.96 V (IC402, #6)
CH1 P-P = 10.96 V CH1 RMS = 6.180 V
5
54 V (Q406, Drain)
CH1 P-P = 54 V CH1 RMS = 22.44 V
4
11.6 V (Q406, Gate)
CH1 P-P = 11.6 V CH1 RMS = 6.944 V
6
18.6 V (Q407, Base)
CH1 P-P = 55.2 V CH1 RMS = 9.52 V
7
1.216 kV (Q407, Collector)
CH1 P-P = 1.216 kV CH1 RMS = 316 V
9
29.8 V (T402, #8)
CH1 P-P = 29.8 V CH1 RMS = 7.14 V
11
808 V (Q502, Base)
CH1 P-P = 808 V CH1 RMS = 244 V
12
234 V (Q503, Drain)
CH1 P-P = 234 V CH1 RMS = 171.5 V
14
580 V (T551, #1)
CH1 P-P = 580 V CH1 RMS = 278.2 V
27
50.4 V (IC301, #5)
CH1 P-P = 50.4 V CH1 RMS = 5.82 V
28
0.52 V (IC301, #1)
CH1 P-P = 0.52 V CH1 RMS = 1.078 V