Sony XR-3100R, Service Manual

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6-12. IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC501 MB90574PMT-G-222-BND (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Description
1 SEEKOUT O
Seek control signal output to the FM/AM tuner unit (TU1)
AM mode: Used for IF count output/SD output request/AGC cut at SEEK or BTM
FM mode: Used for SD speed up at SEEK, BTM, or AF
“L” is output at tuner off
2 AF-SEEK O
PLL low-pass filter time constant selection signal output at AF SEEK
“H” is output when AF SEEK Not used (open)
3
NCO
O
Not used (open)
4 ST-MONO I/O
FM stereo broadcasting detection signal input from the FM/AM tuner unit (TU1), or forced
monaural control signal output to the FM/AM tuner unit (TU1)
“L” is input in the FM stereo mode, or “L” is output in the forced monaural mode
5 TUNMUTE O
Muting on/off control signal output of the FM and AM tuner signal “H”: muting on
6 FM-ON O
FM system power supply on/off control signal output to the BA3918 (IC671)
“L”: AM power on, “H”: FM power on
7
TU-ON O
Tuner system power supply on/off control signal output to the BA3918 (IC671)
“H”: tuner power on
8 VCC — Power supply terminal (+5V)
9 NCO O Not used (open)
10 BUS-ON
O
Bus on/off control signal output to the SONY bus interface (IC701) “L”: bus on
Used for the XR-C33R only
11 SYSRST O Reset signal output to the SONY bus interface (IC701) “L”: reset Used for the XR-C33R only
12 DOORSW I Front panel open/close detection signal input “L” is input when the front panel is closed
13 LCD SO
O Serial data output to the liquid crystal display driver (IC901)
14 LCD CKO
O Serial data transfer clock signal output to the liquid crystal display driver (IC901)
15 BEEP O Beep sound drive signal output terminal
16 LCD CE O Chip enable signal output to the liquid crystal display driver (IC901) “H” active
17 UNISI I Serial data input from the SONY bus interface (IC701) Used for the XR-C33R only
18 UNISO
O Serial data output to the SONY bus interface (IC701) Used for the XR-C33R only
19 UNICKO
O
Serial data transfer clock signal output to the SONY bus interface (IC701)
Used for the XR-C33R only
20 SD-IN
I
Station detector detect input from the FM/AM tuner unit (TU1)
Stop level for SEEK, BTM, etc. is determined SD is present at input of “H”
21 to 23 NCO O Not used (open)
24 SIRCS I Sircs remote control signal input terminal Not used (fixed at “H”)
25 PLLSI I PLL serial data input from the FM/AM PLL (IC1)
26 PLLSO O
PLL serial data output to the FM/AM PLL (IC1)
27 PLLCKO O
PLL serial data transfer clock signal output to the FM/AM PLL (IC1)
28 PLLCE O PLL chip enable signal output to the FM/AM PLL (IC1) “H” active
29 ILL-ON O
30, 31 NCO O Not used (open)
32 NOISE ON O Discharge control signal output for the noise detection circuit “H”: discharge
33
VSS
—
Ground terminal
34 C —
Connected to coupling capacitor for the power supply
35 AD-ON O
A/D converter power control signal output terminal
When the KEYACK (pin
uh
) that controls reference voltage power for key A/D conversion input
is active, “L” is output from this terminal to enable the input
Power on/off control signal output of the illumination LED and liquid crystal display driver
(IC901) “H”: power on Depends on initial setting of power select switch (S501)
Power select switch (S501) on: “H” output at the accessory on
Power select switch (S501) off: “H” output at the power on
Pin No. Pin Name I/O Description
36 RE-IN0
I
37 RE-IN1
I
38 DVCC — Power supply terminal (+5V) (for D/A converter)
39 DVSS — Ground terminal (for D/A converter)
40, 41 NCO O Not used (open)
42 AVCC —
Power supply terminal (+5V) (for A/D converter)
43 AVRH
I Reference voltage (+5V) input terminal (for A/D converter)
44 AVRL I Reference voltage (0V) input terminal (for A/D converter)
45 AVSS — Ground terminal (for A/D converter)
46 KEYIN0
I
Key input terminal (A/D input) (LSW901 to LSW903, S901, LSW905, LSW906)
OFF, SOURCE, MODE
o , SEEK/AMS . m – > M +, SOUND, SHIFT keys
input
47 KEYIN1 I
Key input terminal (A/D input) (LSW921 to LSW923, LSW925 to LSW933)
Z
, PRST –/+ (XR-3100R), PRESET DISC –/+ (XR-C33R), AF/TA, PTY, DSPL, 6, 5, 4
t
,
3 PLAY MODE, 2 SET UP, 1
T
keys input
48 RC-IN0 I Rotary remote commander key input terminal (A/D input)
49 DSTSEL I Destination setting terminal (fixed at “H”)
50 NOISE DET I Noise level detection signal input at SEEK mode (A/D input)
51 D-BASS
I D-BASS switch (S981) input terminal (A/D input)
52 MTP
I Multi-path detection signal input from the RDS decoder (IC51)
53 VSM I
FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU1)
(A/D input)
54 VCC —
Power supply terminal (+5V)
55 RAMBU I
Internal RAM reset detection signal input terminal
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset Fixed at “H” in this set
56 POWSEL I Power select switch (S501) input terminal “L”: off (halt mode), “H”: on (operation mode)
57 NCO O Not used (open)
58 TESTIN
I Setting terminal for the test mode “L”: test mode, Normally: fixed at “H”
59 DOOR-IND O
LED drive signal output of the door indicator “H”: LED on
“H” is output to turn on LED when front panel is opened Not used (open)
60 EVOL MUTE O
Muting control signal output to the electrical volume (IC401)
Volume minimum: “
∞
” output (“H” active)
61 K SEL0 I
Setting terminal for the illumination color
“L”: 2 colors, “H”: 1 color (fixed at “H” in this set)
62 K SEL1 I
Setting terminal for the illumination color “L”: amber (fixed at “L” in XR-3100R and
XR-C33R: amber), “H”: green (fixed at “H” in XR-C33R: green)
63 VSS — Ground terminal
64 NCO
O Not used (open)
65 MUTE
O Audio line muting on/off control signal output terminal “H”: muting on
66, 67 NCO O Not used (open)
68 AMP MUTE O Muting on/off control signal output to the power amplifier (IC611) “L”: muting on
69
FLASH-W
I
Internal flash memory data write mode detection signal input terminal “L”: data write mode
Not used (fixed at “H” in this set)
70 I2C SIO I/O Two-way data bus with the RDS decoder (IC51) and electrical volume (IC401)
71 I2C CKO O Bus clock signal output to the RDS decoder (IC51) and electrical volume (IC401)
72 RC-IN1
I Rotary remote commander shift key input terminal “L”: shift
73 X1A O
Sub system clock output terminal (32.768 kHz)
74 X0A I Sub system clock input terminal (32.768 kHz)
Dial pulse input of the rotary encoder (RE901)
(for VOLUME/BASS/TREBLE/BALANCE/FADER control)