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Adcom Manuals
Amplifier
GTP-740
Service manual
Adcom GTP-740 Service Manual page 34
Dts/ac3 tuner pre-amplifier
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:
Owner's manual
(48 pages)
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Contents
Table of Contents
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IC BLOCK DIAGRAM
KEYBOARD ASSEMBLY
U508: NJM78L05A
TUNER ASSEMBLY
U205: NJM78L05A
TUNER ASSEMBLY
U202: LA1266
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
TUNER ASSEMBLY
U204: LA3401
Power
supply
22
Vol Reg
Symmetrical
-Reactance
Muting
FM AM Change
1
AM
input
OUT
GND
20
18
11
13
IF
Butter
21
RF
MIX
Reg
OSC
22
23
Loop
Loop
PLL
OSC
filter
filter
input
21
20
19
18
Phase
OSC
Comparator
VCO Stop
Circuit
FF
FF
FF
38kHz
Decoder
2
3
4
5
FM
Composite
Separartion
Post
input
amp
adjust
amp
output
output
IN
10
1
2
3
5
IF
FM - IF
Butter
AM - IF
Det
Narrow
OSC
AGC
S-Meter
Butter
GND
24
4
14
19
Pilot sync
detector
Pilot sync
filter,
detector
Changeover
VCO stop
filter
Muting
mute
17
16
15
14
Pilot Det
FF
FF
19kH<90˚
19kH<0˚
Muting Control
FM AM Changeover
Vcc On
Muting
6
7
8
9
Post
Post
Post
Vcc-ON
amp
amp
amp
muting
input
input
output
34
GTP-740
6
7
Vcc
Post
12
Q. D
Amp
9
15
LED
8
S-Meter
Driver
17
16
Stereo
indicator
GND
13
12
Lamp
Driver
Trigger
Stereo
Switch
Muting
Output
10
11
FM/AM
Muting
changeover
output
Table of
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