Diagrams; Ic Pin Function Description - Sony XR-1800 Service Manual

5-1. IC PIN FUNCTION DESCRIPTION

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MAIN BOARD IC1 (SYSTEM CONTROLLER)
LC72322N-9400 (XR-1800), LC72322N-9399 (XR-1803), LC72322N-9412 (XR-1804)
Pin No. Pin Name
1 XIN
2 TEST2
3 NC
4 AM-SD
5 FM-SD
6 STEREO
7 MOTOR
8 AMP-MUTE2
9 MW/SW
10 —
11 BEEP
12 POWER-ON
13 ILL-ON
14 N/R
15 TAPE-IN
16 FF-REW
17 K1
18 K0
19 AMP-ON
20 SEEK
21 SEEK
22 LOCAL/DX
23, 24 —
25 T2
26 T1
27 T0
28 VOL-CE
29 VOL-DI
30 VOL-CL
31 VDD
32 MUTE-REQ
33 BAND-KEY
34 PANEL-IN
35 NC
36 to 40 —
41 MUTE
42 —
43 AMP-MUTE
44 ANT-REM
45 to 48 —
SECTION 5

DIAGRAMS

I/O
I System clock input terminal (4.5 MHz)
I Connected to ground
I Not used (fixed at "H")
I AM signal meter voltage detection input from the FM/AM tuner unit (TU100) "H" active
I FM signal meter voltage detection input from the FM/AM tuner unit (TU100) "H" active
Stereo detection signal input from the FM/AM tuner unit (TU100) (Commonly used for stereo
I
display input) FM stereo detection at input of "L"
O Capstan/reel motor (M901) drive signal output "H": motor on
O Muting control signal output to the power amplifier (IC500) "L": muting on
MW/SW selection signal output to the FM/AM tuner unit (TU100) "H": MW, "L": SW
O
Used for the XR-1804 only
O Not used (open)
O Beep sound signal output terminal "H" active
O Power on/off control signal output "H": power on
Power on/off control signal output for the liquid crystal display driver (IC900), illumination lamp
O
and back light lamp "H": power on
I Tape direction switch (S901) input terminal "H": forward side, "L": reverse side
I Tape in detection switch (S903) input terminal "L": tape in
I FF/REW detection switch (S902) input terminal "L": FF/REW mode
I Key matrix return signal input terminal Not used (fixed at "L")
I Key matrix return signal input terminal
O Standby on/off signal output to the power amplifier (IC500) "L": standby, "H": amp on
Seek control signal output to the FM/AM tuner unit (TU100) "H" active
O
Used for the XR-1800: E model only
Seek control signal output to the FM/AM tuner unit (TU100) "L" active
O
Used for the except XR-1800: E model
O Local/DX selection signal output to the FM/AM tuner unit (TU100) "L": DX, "H": local
O Not used (open)
O Key matrix scan signal output terminal Used for the XR-1800: E model and XR-1804
O Key matrix scan signal output terminal Not used (open)
O Key matrix scan signal output terminal Used for the XR-1800: AEP, UK models
O Chip enable signal output to the electrical volume (IC450) "H" active
O Serial data output to the electrical volume (IC450) "H" active
O Serial data transfer clock signal output to the electrical volume (IC450)
— Power supply terminal (+5V)
I Muting request signal input terminal ("H" active) "L": accessory on, "H": accessory off
I TUNER switch (S900) input terminal "L" is input when pressing the switch
I Detects the removal of the attaching and removing type front panel block "L": attaching
I Not used (fixed at "L")
O Not used (open)
O Audio muting on/off control signal output terminal "H": muting on Not used (open)
O Not used (open)
O Amp muting on/off control signal output terminal "L": muting on Not used (open)
O Control signal output for the external power antenna and external amplifier "H" active
O Not used (open)
Function
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