Sony HCD-MD333 - Hi Fi Cd/minidisc Component, Service Manual

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51 LDIN O MD loading-in signal output to LB1830M (IC153)
52 LDOUT O MD loading-out signal output to LAB1830M (IC153)
53 LD-LOW O Loading motor voltage control signal output to the loading motor driver
54 PROTECT I MD PROTECT switch (S683) detect signal input terminal
55 REFLECT I MD REFLECT switch (S682) detect signal input terminal
56 PACK-IN I Not used
57 PACK-OUT I MD PACK OUT switch (S686) detect signal input terminal
58 CHUCK-IN I MD CHUCKING IN switch (S685) detect signal input terminal
59 LIMIT-IN I MD LIMIT IN switch (S681) detect signal input terminal
60 REC. P I MD REC POSITION switch (S688) detect signal input terminal
61 PB. P I MD PB POSITION switch (S687) detect signal input terminal
62 +5V — Power supply (+5V)
63 — — Not used (fixed at “L”)
64 GND — Ground terminal
65 to 72 — — Connect terminal 65 to 72 Not used (fixed at “L”)
73 to 78 — — Not used (fixed at “L”)
79 SDA I/O Tow-way data bus for the EEPROM (IC171)
80 SCL O Clock signal output to the EEPROM (IC171)
81, 82 — — Not used (fixed at “L”)
83 POWER —
84, 85 — —
86, 87 — — Not used (fixed at “L”)
88 to 90 — — Connect terminal 88 to 90 Not used (fixed at “L”)
91 to 93 KEY0, KEY1, KEY2 — Connect terminal 91 to 93 Not used (fixed at “H”)
94 — — Not used (fixed at “L”)
95 SOURCE — Not used (fixed at “L”)
96 AVSS — Ground terminal
97 — — Not used (fixed at “L”)
98 VREF5V — Power supply (+5V)
99 3.3V — Power supply (+3.3V)
100 — — Not used (fixed at “L”)
Pin No. Pin Name I/O Function
Conenct terminal 83 to 85 Not used (fixed at “L”)