Sony MZ-R900 Service Manual - Page 39

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, 168 169 NC CLK SEL O Not used (open) 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) 37