Sony Walkman MZ-R900 Service Manual page 39

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