Sony MDX-C7900 Service Manual page 42

Pin No. Pin Name
47 UNIREQ
48 UNCKI
49 UNISI
50 UNISO
51 MD-CKO
52 MD-SI
53 NCO
54 SENS
55 CC-XINT
56 LIMIT-IN
57 EJT-KEY
58 ERROR-PWM
59 MD-RST
60 BU-IN
61 BUS-ON
62 SQSY
63 C-SW
64 MD-LAT
65 MD-ON
66 DEEMP
67 A-MUTE
68 NCO
69 TSTCKO
70 TSTSO
71 TSTMOD
72 VCC
73 NC
74 to 77
TOUT0 to TOUT3
78 to 80 TIN0 to TIN2
*1 Loading motor (M903) control
Operation
IN
Terminal
LOAD (pin 6) "H"
"L"
EJECT (pin 7)
I/O
O
Data request signal output terminal (for SONY bus) "H": request on Not used (open)
I Serial data transfer clock signal input from the master controller (IC700) (for SONY bus)
I
Serial data input from the SONY bus interface (IC600)
O
Serial data output to the SONY bus interface (IC600)
O
Serial data transfer clock signal output to the CXD2652AR (IC301) and CXA2523R (IC302)
I Reading serial data signal input from the CXD2652AR (IC301)
O
Not used (open)
I
Internal status (SENSE) input from the CXD2652AR (IC301)
I Interrupt status input from the CXD2652AR (IC301)
Detection input from the sled limit-in detect switch (S903)
I
The optical pick-up is inner position when "L"
I Eject request signal input terminal "L": eject on Not used (fixed at "H")
O
PWM error monitor output terminal (C1and ATER is output when test mode) Not used (open)
O
Reset signal output to the CXD2652AR (IC301) and BH6511FS (IC303) "L": reset
Battery detect signal input from the SONY bus interface (IC600) and battery check circuit
I
"H": battery on
I
SONY bus on/off control signal input from the master controller (IC700) "L": bus on
Subcode Q sync (SCOR) input from the CXD2652AR (IC301)
I
"L" is input every 13.3 msec Almost all, "H" is input
Inputs the disc loading start or disc eject completion detect switch (S901) detection signal
I
"L": When start or eject completed of the disc loading operation
O
Serial data latch pulse signal output to the CXD2652AR (IC301) and CXA2523R (IC302)
Power supply on/off control signal output of the MD mechanism deck section main power supply
O
"H": power on
O
Emphasis on/off control signal output terminal "H": emphasis on Not used
O Audio muting on/off control signal output terminal Not used
O
Not used (open)
O
Output of clock signal for the test mode display Not used (open)
O
Output of data for the test mode display Not used (open)
I
Setting terminal for the test mode "L": test mode, "H": normal mode
—
Power supply terminal (+5V)
—
Not used (fixed at "H")
O Output of the 4 8 matrix test keys
I/O Input of the 4 8 matrix test keys ("L" is always output, except in test mode)
OUT BRAKE
"L" "H"
"H" "H"
Function
Not used (open)
STOP
"L"
"L"
– 60 –
Not used (open)