Sony XR-C7500RX Service Manual page 38

Pin No. Pin Name
73 X1A
74 X0A
75 DAVN
76 CDON-ON
77 BU-IN
78 DSPREADY
79 KEYACK
80 AD ON
81 ACCIN
82 FLASH ON
83 PW-ON
84 TESTIN
85 RAMBU
86 HSTX
87 MD2
88 MD1
89 MD0
90 RESET
91 VSS
92 X0
93 X1
94 VCC
95 ILLIN
96
TELATT
97
EMPH
98 F CH
99 to 102 NC
103 4V SEL
104 COL SEL
105 AMPATT
106 BOOT
107 DSP GAIN
108 NC
109 XR CDMD
110 DSP ON
38
I/O
O
Sub system clock output terminal (32.768 kHz)
I
Sub system clock input terminal (32.768 kHz)
I
Data transmit completed detection signal input from the RDS decoder (IC50) "H" active
I
CD/MD on/off control signal input terminal (fixed at "L" in this set)
Battery detection signal input from the SONY bus interface (IC500) and battery detect circuit
I
"L" is input at low voltage
Transfer enable signal input from the CXD2726Q (IC100)
I
"L": transfer prohibition , "H": transfer permission
Input of acknowledge signal for the key entry Acknowledge signal is input to accept function
I
and eject keys in the power off status On at input of "H"
A/D converter power control signal output terminal
O
When the KEYACK (pin ul) that controls reference voltage power for key A/D conversion input
is active, "L" is output from this terminal to enable the input
I Accessory detection signal input terminal "L": accessory on
Power on/off control signal output of the illumination LED and liquid crystal display driver
O
(IC800) "H": power on
O Main system power supply on/off control signal output terminal "H": power on
I Setting terminal for the test mode "L": test mode, Normally: fixed at "H"
Internal RAM reset detection signal input from the RAM reset (IC570)
I
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset
I
Hardware standby input terminal "L": hardware standby mode Reset signal input in this set
I
Setting terminal for the CPU operational mode (fixed at "L" in this set)
I
Setting terminal for the CPU operational mode (fixed at "H" in this set)
I
Setting terminal for the CPU operational mode (fixed at "H" in this set)
System reset signal input from the reset signal generator (IC560) and reset switch (S500)
I
"L": reset "L" is input for several 100 msec after power on, then it changes to "H"
—
Ground terminal
I Main system clock input terminal (3.68 MHz)
O Main system clock output terminal (3.68 MHz)
—
Power supply terminal (+5V)
Auto dimmer control illumination line detection signal input terminal
I
"L" is input at dimmer detection
I Telephone detection signal input terminal At input of "H", the signal is attenuated by –20 dB
I Emphasis control signal input terminal Not used (open)
O Frequency changing terminal
O
Not used (open)
Input terminal of whether line driver is mounted or not is detected
I
"L": line driver is not mounted, "H": line driver is mounted
Setting terminal for the illumination color
I
"L": 2 color (XR-C7500R), "H": 1 color (XR-C7500RX)
O Power amplifier muting on/off control signal output terminal "H": muting on
O Serial data output to the liquid crystal display drive controller (IC800)
O Not used (open)
O Not used (open)
Setting terminal for the internal mechanism tape or CD/MD
I
"L": tape, "H": CD/MD (fixed at "L" in this set)
O Power supply on/off control signal output terminal "H": DSP on Not used (open)
Description
"H": frequency change Not used (open)