Adcom GTP-740 - Channel Delay and Speaker Size Settings

34
GTP-740
OUT
GND
IN
KEYBOARD ASSEMBLY
U508: NJM78L05A
TUNER
ASSEMBLY
U205: NJM78L05A
22 23 24 14 19 17 164
8
15
9
12
7653211013111820
21
IF
Butter
IF
Butter
FM - IF Q. D
Post
Amp
LED
Driver
S-Meter
Det
AGC
Narrow
S-Meter
AM - IFMIXRF
Reg OSC
OSC
Butter
GND
Vcc
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
TUNER ASSEMBLY
U202: LA1266
1
AM
input
FM
input
Composite
amp
output
Separartion
adjust
Post
amp
output
Post
amp
input
Post
amp
input
Post
amp
output
Vcc-ON
muting
FM/AM
changeover
Muting
output
GND
Stereo
indicator
Changeover
muteMuting
Pilot sync
detector
filter
Pilot sync
detector
filter,
VCO stop
PLL
input
Loop
filter
Loop
filterOSC
Power
supply
Muting
FM AM Change
2 3 4 5 6 7 8 9 10 11
22 21 20 19 18 17 16 15 14 13 12
Decoder
Muting Control
FM AM Changeover
Muting
Output
Vol Reg
Symmetrical
-Reactance
Circuit
OSC
VCO Stop
FF
Phase
Comparator
Pilot Det
Vcc On
Muting
FF
FF
38kHz
FF
19kH<90˚
FF
19kH<0˚
Stereo
Switch
Lamp
Driver
Tr igger
TUNER ASSEMBLY
U204: LA3401
IC BLOCK DIAGRAM