Memorex MT2025D Service Manual - Page 14

Test point Waveforms

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3. IC701: Sound power amplify (TFA9800J) Symbol PIN Function Symbol -INV1 1 Non-inverting input 1 Vp SGND 2 Signal ground M/SS SVRR Out 1 PGND OUT2 3 Supply voltage ripple rejection output -INV2 4 Output 1 5 Power ground 6 Output 2 4. IC401: Vertical output (STV9302A() Symbol PIN Function INPUT 1 SUPPLY VOLTAGE 2 Flyback generator 3 GND 4 Output 5 Inverting input Supply voltage Flyback generator Ground or negative supply Output Symbol Poutput supply Input 5. U101：Tuner PIN Function 1 Nc 2 Tu 3 Rf agc 4 SCL 5 SDA 6 Btl PIN Function 7 +5V 8 IFA1 9 IF AGC 10 IFD 1OUT 11 IFD 2 OUT PIN Function 7 Supply voltage 8 Mute/standby input switch 9 Non-inverting input 2 PIN stage 6 7 Function Output stage supply Non-inverting input 6. Test point Waveforms 2.6Vpp 1.2Vpp 3.8Vpp 2.5Vpp 2.5Vpp H R2J10165GC 95Vpp H R2J10165GC 95Vpp H R2J10165GC 95Vpp H R2J10165GC 0.9Vpp H R2J10165GC 5Vpp H CRT KR 1Vpp V R2J10165GC H CRT KG 0.8Vpp V R2J10165GC H CRT KB 1.3Vpp R2J10165GC H R2J10165GC H R2J10165GC 9 PDF pdf Fact or y Pr o www. f i nepr i nt . com. cn

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9
3.
IC701: Sound power amplify (TFA9800J)
Symbol
PIN
Function
Symbol
PIN
Function
-INV1
1
Non-inverting input 1
Vp
7
Supply voltage
SGND
2
Signal ground
M/SS
8
Mute/standby
switch
input
SVRR
3
Supply voltage ripple
rejection output
-INV2
9
Non-inverting input 2
Out 1
4
Output 1
PGND
5
Power ground
OUT2
6
Output 2
4. IC401: Vertical output (STV9302A()
Symbol
PIN
Function
Symbol
PIN
Function
INPUT
1
Inverting input
Poutput
stage
supply
6
Output stage supply
SUPPLY VOLTAGE
2
Supply voltage
Input
7
Non-inverting input
Flyback generator
3
Flyback generator
GND
4
Ground
or
negative
supply
Output
5
Output
5. U101
：
Tuner
PIN
Function
PIN
Function
1
Nc
7
+5V
2
Tu
8
IFA1
3
Rf agc
9
IF AGC
4
SCL
10
IFD 1OUT
5
SDA
11
IFD 2 OUT
6
Btl
6. Test point Waveforms
5Vpp
0.9Vpp
1.3Vpp
H
H
1Vpp
V
CRT KB
CRT KG
CRT KR
95Vpp
95Vpp
95Vpp
H
H
H
R2J10165GC
2.5Vpp
2.5Vpp
3.8Vpp
H
H
H
R2J10165GC
R2J10165GC
R2J10165GC
R2J10165GC
0.8Vpp
V
R2J10165GC
R2J10165GC
R2J10165GC
1.2Vpp
2.6Vpp
H
H
R2J10165GC
R2J10165GC
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