Motorola CP160 - Page 44

2-4 TROUBLESHOOTING TABLES
U401
Microprocessor
75 PJ4 3.23
76 PJ5 0
77 PJ6 3.23 Bottom option button
78 PJ7 3.23 Top option button
79 PA0_IC3 0
80 PA1_IC2 1.57
81 PA2_IC1 3.00
82 PA3_IC4_OC5_OC1 3.00
83 PA4_OC4_OC1 0 Squelch detect input
84 PA5_OC3_OC1 0 Channel activity input
85 PA6_OC2_OC1 0
86 PA7_PA1_OC1 0
87 VSSR GND
88 VDDR 3.23
89 ECLK (NU) 1.60
90 EXTAL 1.70 Clock from U451-28
91 XTAL 1.40 Not used
92 VDDSYN 0
93 XFC (NU) 0
94 RESET 3.20 From U320
95 LVOUT 0
96 IRQ 3.20
97 PD0_RXD 3.23
98 PD1_TXD 1.9
99 PD2_MISO 0
100 PD3_MOSI 3.23
U402
EEPROM
1 Chip select 3.23 From U401-3
2 Serial data out 0
3 Write protect 3.23
4Vss GND
5 Serial data in 3.23
6 Serial clock 0
7 Hold 3.23
8Vcc 3.23
IC Designator Pin Pin Function DC Voltage Comments (Condition)