Sony PMC-MD55 - Md Boombox, Service Manual

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Pin No. Pin Name I/O Description
87 REC/PB O
Not used (open)
88 NC
— Not used (open)
89 SCTX O
Recording data output enable signal output to the CXD2654R (IC121) and overwrite head
driver (IC181) Writing data transmission timing output (Also serves as the magnetic head on/off
output)
90 XLATCH O Serial data latch pulse signal output to the CXD2654R (IC121)
91, 92 NC — Not used (open)
93 AMUTE O Muting control signal output terminal Not used (open)
94 LDOUT O Motor control signal output to the loading motor driver (IC602) “L” active *1
95 LDIN O Motor control signal output to the loading motor driver (IC602) “L” active *1
96 LIMIT-IN I
Detection input from the sled limit-in detect switch (S101)
The optical pick-up is inner position when “L”
97 PROTECT I Rec-proof claw detect input from the protect detect switch (S102-2) “H”: write protect
98 REFLECT I
Detection input from the disc reflection rate detect switch (S102-1)
“L”: high reflection rate disc, “H”: low reflection rate disc
99 GND — Ground terminal
100 +3.3V — Power supply terminal (+3.3V)
*1 Loading motor (M103) control
LOADING EJECT BRAKE RUN IDLE
LDIN (pin
(∞
)
“L” “H” “L” “H”
LDOUT (pin
(¢
)
“H” “L” “L” “H”
Terminal
Mode