37
MZ-R900
Pin No.
Pin Name
I/O
Description
156, 157
TEST1, TEST0
I
Input terminal for the main test (normally fixed at “L”)
158
EVA
I
EVA/FLASH chip discrimination terminal “L”: FLASH chip, “H”: EVA chip
159
NC
O
Not used (open)
160
SSB DATA
I/O
Input/output of SSB serial data with RF amp (IC501)
161
SSB CLK
O
SSB serial clock output to RF amp (IC501)
162
MCUVSS0
—
Ground terminal (for the microcomputer block)
163
VREC PWM
O
Over write head control spare terminal Not used (open)
164
VL PWM
I
PWM for the laser automatic power supply voltage control signal output to the power control
(IC901)
165
VC PWM
I
PWM signal output for the system power supply voltage control to the power control (IC901)
166
SPDL AUX
PWM
O
PWM signal output for the spindle support to the motor driver (IC551)
167, 168
NC
O
Not used (open)
169
CLK SEL
O
System clock select signal output to the power control (IC901)
170
OPEN CLOSE
SW
I
Open/close detection switch (S806) of the upper panel input terminal (A/D input)
“L”: when upper panel close
171
GND SW
O
Control signal output to the ground (GND) changeover switch
172
SET CODE0
O
Input terminal for the set (fixed at “L” except for US/Canadian)
173
SET CODE1
O
Input terminal for the set (open in this set)
174, 175
SET CODE2, 3
O
Input terminal for the set (fixed at “L” in this set)
176
MIFVDD1
—
Power supply terminal (for the microcomputer I/F block) (+2.3V)
177
MIFVSS1
—
Ground terminal (for the microcomputer I/F block)
178
AOUT SEL
O
HP/LINE changeover signal output to the headphone amp (IC302)
179
SI0
I
Serial data input from the nonvolatile memory (IC804) and liquid crystal display element
module
180
SO0
O
Serial data output to the nonvolatile memory (IC804), A/D, D/A converter (IC301) and
liquid crystal display element module
181
SCK0
O
Serial clock signal output to the nonvolatile memory (IC804), A/D, D/A converter (IC301)
and liquid crystal display element module
182
XGUM ON
I
Battery pack detection switch (S804) input terminal for the charge “L”: there is battery pack
for the charge
183
BEEP
O
Beep sound control signal output to the headphone amp (IC302)
184
NC
O
Not used (open)
185
VD SEL
O
VD power supply changeover signal output terminal Not used (open)
186
XMUTE
O
Analog muting control signal output terminal to the headphone amp (IC302)
“L”: muting ON
187
LCD RST AUX
O
Reset control signal output terminal to the liquid crystal display element “L”: reset
188, 189
NC
O
Not used (open)
190
XPATCH
I
Patch function detection input terminal “L”: patch function Not used (open)
191
OPT DET
I
DIN plug detection signal input terminal
192
XJACK DET
I
LINE IN plug detection signal input terminal
193
XMIC DET
I
Microphone plug detection signal input terminal
194, 195
PD S0, PD S1
O
PD IC mode changeover signal output to the optical pick up
196
MIFVDD2
—
Power supply terminal (for the microcomputer I/F block) (+2.3V)
197 to
199
MODE1 to 3
O
Power supply control signal output (for the over write head drive) to the over write head
drive (IC601)
200, 201
HD CON 1, 2
O
Over write head control signal output to the over write head drive (IC601)
202
REC WBL SW
O
LPF changeover switch input terminal when REC/PB control Not used (open)
203
XCS ADA
O
Chip select signal output to A/D, D/A converter (IC301)
Summary of Contents for Walkman MZ-R900
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