Sony HCD-MD555, Service Manual

Page: 90 / 124

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Pin No.
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
I/O
O
—
O
O
O
O
O
O
O
I
I
—
O
Description
Tracking servo drive PWM signal (+) output to the BH6511FS (IC152)
Power supply terminal (+3.3 V) (digital system)
Focus servo drive PWM signal (+) output to the BH6511FS (IC152)
Focus servo drive PWM signal (–) output to the BH6511FS (IC152)
Clock signal (176.4 kHz) output terminal (X’tal system). Not used in this set (open)
Sled servo drive PWM signal (–) output to the BH6511FS (IC152)
Sled servo drive PWM signal (+) output to the BH6511FS (IC152)
Spindle servo drive PWM signal (–) output to the BH6511FS (IC152)
Spindle servo drive PWM signal (+) output to the BH6511FS (IC152)
FG signal output. Not used in this set (fixed at “L”)
TEST input terminals (fixed at “L”)
Ground terminal (digital system)
The record EFM signal output to the over-write head driver (IC181)
Pin Name
TFDR
DVDD
FFDR
FRDR
FS4
SRDR
SFDR
SPRD
SPFD
FGIN
TEST1
TEST2
TEST3
DVSS
EFMO