Motorola CP150TM User Manual
Page 55
6880309N62-C
June, 2005
VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals
6-13
U401
Microprocessor
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
4
Vss
GND
5
Serial data in
3.23
6
Serial clock
0
7
Hold
3.23
8
Vcc
3.23
U404
Flash ROM
1
A11
3.06
2
A9
3.08
3
A8
3.05
4
A13
0.13
5
A14
0.31
6
NC
3.17
7
EN_WE
3.21
From U401-4
8
Vcc
3.23
9
RESET
3.20
Table 6-4. Troubleshooting Table for Board and IC Signals (Continued)
IC Designator
Pin
Pin Function
DC Voltage
Comments (Condition)