MITSUI MTV-DV05, Service Manual

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SERVICE MANUAL
SERVICE DATA OF KEY ICS
Table 4 Functions and Service Data of LA76835 (N101)’s Pins
GDM8145 Multimeter
Ground Resistance ( Ω )
Pin
No.
Function Description
Voltage
of
Pin (V)
Measure with
red probe
while
grounding
black probe.
Measure with
black probe
while
grounding
red probe.
1 Audio signal output (NC) 2.33 810 712
2 Audio demodulation output 2.36 975 675
3 IF AGC filter 2.6 860 718
4 RFAGC voltage output 1.95
∞
680
5 IF signal input 2.89 780 693
6 IF signal input 2.89 778 712
7 IF circuit ground 0 0 0
8 Supply voltage for IF circuit 5.04 500 280
9 Filter for discriminator 1.98 910 713
10 AFT voltage output 3.65 910 617
11 I
2
C bus data line 4.71 1560 640
12 I
2
C bus clock line 4.41 1542 667
13 Auto brightness control input 3.68 945 577
14 R character signal input 1.43/0 920 700
15 G character signal input 1.46/0 913 701
16 B character signal input 1.44/0 906 700
17 Supply voltage for decoder 0.02/0 780 683
18 Red (R) signal output 8.28 525 500
19 Green (G) signal output 2.81 780 671
20 Blue (B) signal output 2.79 780 670
21 Character blanking signal input 2.7 780 670
22 White balance adjusting signal input (NC) 1.85 830 696
23 Vertical sawtooth output 2.45 710 672
24 Vertical sawtooth generation 2.64 782 702
25 Horizontal start supply voltage 5.27 350 350
26 Low pass filter for horizontal AFC 2.72 815 708
27 Line drive pulse output 0.72 700 653
28 Line flyback pulse input 0.91 785 707
29 Reference voltage generation terminal 1.74 746 700
30 B-Y color difference signal input (SECOM) 0.93 825 608
31 C-Y color difference signal input (SECOM) 0.94 330 330
32 External video/chroma signals inputs 4.17 ∞ 567
33 1H baseband delay circuit ground 0 0 0
(continued)
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