SERVICE MANUAL
48 ANA-IN1-
1.53
7.3
5.26
49 ANA-IN2+
0.09
7.3
5.27
50 TESTEN
0.01
0.001
0.00
51 XTAL-2N
2.35
6.8
5.27
52 XTAL-OUT
2.36Hs
6.8
5.3
Table 16 Functions and Service Data of TDA9808T Pins
Digital Multimeter
Pin No.
Function Description
Reference
Voltage (V)
Positive
Resistance (20K
Ω
)
Negative
Resistance(20K
Ω
)
1
PIF signal input 1
3.23
7.2
6.03
2
PIF signal input 2
3.23
7.2
5.99
3
RFAGC start-control level adjust
0.99
6.7
5.85
4
PLL APC filter
2.53
7.9
6.3
5
Audio AGC filter
3.29
7.8
6.17
6
Audio output (NTSC 4.5MHz) 2.34
7.2
5.86
7 Filter
1.79
7.9
6.29
8
1/2VCC comparison voltage bias
0
∞
∞
9 Video
output
2.18
7.6
6.09
10
Second SIF signal output
2.03
7.7
6.17
11
Second SIF signal input
2.81
5.2
4.99
12 RFAGC
output
0.04
6.1
13
AGC signal output
3.05
7.9
6.2
14
External connection for VCO oscillating LC network 2.76 7
6
15
External connection for VCO oscillating LC network 2.76 7
6
16 Ground
0
0.001
0.00
17 AGC
filter
3.13
7.9
6.11
18
Supply voltage input terminal
8
2.1
2.7
19
SIF signal input
3.2
2.1
6.27
20
SIF signal input?
3.2
7
6.27
57
Summary of Contents for 21E88
Page 25: ...SERVICE MANUAL CONTROL BUTTONS 1 CONTROL BUTTONS Fig Fig 5 Front panel 23 Fig 6 Rear panel ...
Page 36: ...SERVICE MANUAL 3 Block Diagram for TMPA8801 Fig 13 34 ...
Page 37: ...SERVICE MANUAL 4 Block Diagram for TMPA8807 Fig 14 35 ...
Page 51: ...SERVICE MANUAL 3 Block Diagram Fig 22 Block Diagram 49 ...
Page 63: ...CIRCUIT DIAGRAM FOR 21E88 ...
Page 66: ...PRINTED CIRCUIT BOARD DIAGRAM 1 ...
Page 67: ...PRINTED CIRCUIT BOARD DIAGRAMS 2 ...
Page 68: ...PRINTED CIRCUIT BOARD DIAGRAMS 3 JUC7 820 820 ...
