Service manual

76
Pin No. Pin Name I/O Description
66 XLATCH
O Serial data latch pulse signal output to the CXD2654R (IC121)
67 WRPWR
O
Laser power select signal output to the CXD2654R (IC121) and HF module switch circuit
“L”: playback mode, “H”: recording mode
68
LOADING
SEL: L
I
Setting terminal for the loading control method
“H”: not used IN switch (fixed at “L”)
69 L3MODE O
L3 bus mode control signal output to the A/D, D/A converter (IC201)
70, 71
—
I
Not used (fixed at “H”)
72 SCTX O
Recording data output enable signal output to the CXD2654R (IC121) and over write head driver
(IC181) Writing data transmission timing output (Also serves as the magnetic head on/off
output)
73 XINT
I Interrupt status input from the CXD2654R (IC121)
74 REC-P O
Detection input from the recording position detect switch (S601) “L”: recording position
75 DQSY
I
Digital In U-bit CD format subcode Q sync (SCOR) input from the CXD2654R (IC121)
“L” is input every 13.3 msec Almost all, “H” is input
76
—
I
Not used (open)
77 DIGRST O
Reset signal output to the CXD2654R (IC121) and BH6511FS (IC152) “L”: reset
78 SENS
I Internal status (SENSE) input from the CXD2654R (IC121)
79 MNT3 I
Spindle servo lock status monitor signal input from the CXD2654R (IC121)
80 MNT2 I
Busy signal input from the CXD2654R (IC121)
81 MNT1 I
Track jump detection signal input from the CXD2654R (IC121)
82
MNT0
I
Focus OK signal input from the CXD2654R (IC121)
“H” is input when focus is on (“L”: NG)
83 SENSOR SW O
Control signal output for the sensor gain selection Not used (fixed at “L”)
84 DISK5 I
Detection input from the disc detect switch “L”: disc is set Not used (fixed at “L”)
85 DISK1 I
Detection input from the disc detect switch “L”: disc is set Not used (fixed at “L”)
86 DISK2 I
Detection input from the disc detect switch “L”: disc is set Not used (fixed at “L”)
87 SCL O
Serial clock signal output to the EEPROM (IC171)
88 SDA I/O
Two-way data bus with the EEPROM (IC171)
89 DISK4 I
Detection input from the disc detect switch “L”: disc is set Not used (fixed at “L”)
90 DISK3 I
Detection input from the disc detect switch “L”: disc is set Not used (fixed at “L”)
91
HEADSW-
DOWN
I
Detection input from the over write head down position detect switch
“L”: down position Not used (fixed at “L”)
92 HEADSW-UP I
Detection input from the over write head up position detect switch
“L”: up position Not used (fixed at “L”)
93 to 95 KEY3 to KEY1
I Key input terminal (A/D input) Not used (fixed at “H”)
96 AVSS
— Ground terminal (for A/D converter)
97 KEY0
I Key input terminal (A/D input) Not used (fixed at “H”)
98 VREF I
Reference voltage (+3.3V) input terminal (for A/D converter)
99 +3.3V
— Power supply terminal (+3.3V)
100 WMIN I
Serial data input from the equipment connected to other unit Not used (fixed at “L”)