Motorola Pr400 Detailed 6881096c25 B Manual

6881096C25-BJune, 2005
UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 11-11
U401
Microprocessor
46PH1_PW23.00
47 PH0_PW1 3.23 Synth chip select
48XIRQ3.00
49 PI7 1.48 RX enable
50PI60.01TX enable
51 PI5 3.23
52PI40Green LED enable
53 PI3 0 Red LED enable
54PI20
55 PI1 0
56PI02.98Lock detect from U201-4
57 MODB_VSTBY 3.22 Boot mode enable
58MODA_LIR3.12
59 AVDD 3.23
60PE7_AN73.20
61 PE6_AN6 3.20
62PE5_AN52.91VOX threshold detect
63 PE4_AN4 0.73 RSSI input
64PE3_AN30.14
65...

June, 20056881096C25-B
11-12UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals
U401
Microprocessor
82PA3_IC4_OC5_OC13.00
83 PA4_OC4_OC1 0 Squelch detect input
84PA5_OC3_OC10Channel activity input
85 PA6_OC2_OC1 0
86PA 7 _ PA 1 _ O C 10
87 VSSR GND
88VDDR3.23
89 ECLK (NU) 1.60
90EXTAL1.70Clock from U451-28
91 XTAL 1.40 Not used
92VDDSYN0
93 XFC (NU) 0
94RESET3.20From U320
95 LVOUT 0
96IRQ3.20
97 PD0_RXD 3.23
98PD1_TXD1.9
99 PD2_MISO 0
100PD3_MOSI3.23
U402
EEPROM1 Chip select 3.23...

6881096C25-BJune, 2005
UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 11-13
U404
Flash ROM
10A163.17
11 A 1 5 0 . 3 0
12A120.22
13 A7 3.03
14A63.08
15 A5 3.06
16A40
17 A3 0.24
18A23.08
19 A1 3.05
20A03.05
21 D0 0.69
22D10.94
23 D2 1.08
24GNDGND
25 D3 0.78
26D40.59
27 D5 0.66
28D60.67
29 D7 0.75
30EN_CE3.01From U401-38
31 A10 0.16
32EN_OE0From U401-86
U451
ASFIC_CMP1 VDD for analog circuits 3.00
2DISC audio input1.34From U510
3 Ground for analog circuits GND
4DACU output0
5...

June, 20056881096C25-B
11-14UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals
U451
ASFIC_CMP
14GCB1 general purpose output0
15 GCB0 general purpose output 3.00 BW select (25 kHz mode)
16Squelch channel activity output0To U401-84
17 Squelch detect digital output 0 To U401-83
18PL/low speed data I/O1.50
19 High speed data I/O 3.00
20Chip select3.23From U401-2
21 Serial clock input 0
22Serial data input3.23
23 Ground for clock synthesizer GND
24Loop filter cap for clock syn0.74
25...

6881096C25-BJune, 2005
UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 11-15
U480
Dual Opamp1 Unit 1 output 2.48
2Unit 1 (-) input2.48
3 Unit 1 (+) input 2.46
4GroundGND
5 Unit 2 (+) input 0.28
6Unit 2 (-) input0.29
7 Unit 2 output 0
8Vcc4.96
U490
Audio Power Amp1 Enable/shutdown 0.12 (Unsquelched)
2Bias reference3.26(Unsquelched)
3 (+) input 3.26 (Unsquelched)
4(-) input3.27(Unsquelched)
5 (-) output 3.25 (Unsquelched)
6Vcc7.48(Unsquelched)
7 Ground GND
8(+)...

June, 20056881096C25-B
Notes:
11-16UHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals 

Chapter 12 UHF Schematic Diagrams, Overlays, and 
Parts Lists
12.1 Introduction
This section provides schematic diagrams, overlays, and parts lists for the radio circuit boards and 
interface connections.
12.1.1 Notes For All Schematics and Circuit Boards
* Component is frequency sensitive. Refer to the Electrical Parts List for value and usage.
1. Unless otherwise stated, resistance values are in ohms (K = 1000), capacitance values are in 
picofarads (pF) or microfarads (µF), and inductance values are...

June, 20056881096C25-B
12-2UHF Schematic Diagrams, Overlays, and Parts Lists: Introduction
7. Circuit Block Interconnection Legend:
301-400 DC Regulation
401-450Microprocessor
451-550 Audio
Name Description
USWB+Unswitched Battery Voltage (always on)
5V 5 volts (regulated)
5R5 volts in RX mode only
5T 5 volts in TX mode only
RESETLow-line reset signal from U320 to uP
D3_3V Digital 3.3 volts (regulated)
3VAnalog 3 volts (regulated)
TX_ENA Transmit enable signal from uP to transmitter
PWR_SETDC voltage...

6881096C25-BJune, 2005
UHF Schematic Diagrams, Overlays, and Parts Lists: Speaker and Microphone Schematic 12-3
12.1.2 Six Layer Circuit Board
Figure 12-1.  Six-Layer Circuit Board: Copper Steps in Layer Sequence 
12.2 Speaker and Microphone Schematic
Figure 12-2.  Speaker and Microphone Schematic
12.2.1 Speaker and Microphone Parts List
Reference
DesignatorMotorola Part 
No.Description
MK15085880L01Microphone, electret
SP1 5085738Z08
 Speaker assembly with 
connector
LAYER 1 (L1)
LAYER 2 (L2)
LAYER 3...

June, 20056881096C25-B
Notes:
12-4UHF Schematic Diagrams, Overlays, and Parts Lists: Speaker and Microphone Schematic