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 PE2_AN2 1.62
66PE1_AN10 - 3.3 VVolume control wiper
67 PE0_AN0 2.48 33% of battery voltage
68VRL0
69 VRH 3.20
70AVSSGND
71 PJ0_CSGP3 3.23 Side PTT button
72PJ1_CSGP40External MIC PTT
73 PJ2 3.23
74PJ33.23
75 PJ4 3.23
76PJ50
77 PJ6 3.23 Bottom option button
78PJ73.23Top option button
79 PA0_IC3 0
80PA 1 _ I C 21.57
81 PA2_IC1 3.00
Table 11-4.  Troubleshooting Table for Board and IC Signals  (Continued)
IC Designator Pin Pin Function DC Voltage Comments (Condition) 
						

							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 From U401-3
2Serial data out0
3 Write protect 3.23
4VssGND
5 Serial data in 3.23
6Serial clock0
7Hold 3.23
8Vcc3.23
U404
Flash ROM1 A11 3.06
2A93.08
3A8 3.05
4A130.13
5 A14 0.31
6NC3.17
7 EN_WE 3.21 From U401-4
8Vcc3.23
9 RESET 3.20
Table 11-4.  Troubleshooting Table for Board and IC Signals  (Continued)
IC Designator Pin Pin Function DC Voltage Comments (Condition) 
						

							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 DACR output 0
6DACG output2.38 (typ)Power set (TX mode)
7 VOX peak detector output 2.91
8PLCAP for DC integrator0.40
9 SQIN 0.01
10Universal audio input/output0
11 VDD for DACs 4.95
12SQCAP0
13 GCB2 general purpose output 0 Audio PA_EN (unsquelched)
Table 11-4.  Troubleshooting Table for Board and IC Signals  (Continued)
IC Designator Pin Pin Function DC Voltage Comments (Condition) 
						

							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 PLCAP2 for LS integrator 1.17
26Not used0
27 Vdd for clock synthesizer 3.00
28Clock synthesizer output1.70
29 1200 Hz ref for MDC decode 3.00
30GNDDOGND
31 Ground for digital circuits GND
32Vdd for analog switches4.96
33 Vdd for digital circuits 3.00
3416.8 MHz master clock input1.54
35 GCB3 general purpose output 3.00 Internal MIC enable
36TX audio return from option0
37 GCB4 general purpose output 0
38GCB5 general purpose output0
39 RX audio send to option 1.48
40Modulation output1.50To U201-10
41 RX audio out to power amp 1.51
42Flat TX audio return from option0.20
43 RX audio return to option 1.50
44Flat TX audio send to option1.50
45 Vdd for audio path I/O filters 3.00
46Mic audio input1.50
47 Ground for audio path I/O filters GND
48Ext mic audio input (not used)0
Table 11-4.  Troubleshooting Table for Board and IC Signals  (Continued)
IC Designator Pin Pin Function DC Voltage Comments (Condition) 
						

							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(+) output3.29(Unsquelched)
U510
Dual Opamp1 Unit 1 output 1.75
2Unit 1 (-) input1.56
3 Unit 1 (+) input 1.55
4GroundGND
5 Unit 2 (+) input 1.55
6Unit 2 (-) input1.56
7 Unit 2 output 1.38
8Vcc4.96
1. All voltages are measured with a high-impedance digital voltmeter and expressed in volts DC relative to ground (0V).
2. Voltages are measured with a DC input voltage of 7.50 + .02 volts DC applied to the battery connector (J301).
3. All voltages are measured in the squelched receive mode, unless otherwise indicated.
4. Voltages are identical for VHF and UHF models unless otherwise indicated.
Table 11-4.  Troubleshooting Table for Board and IC Signals  (Continued)
IC Designator Pin Pin Function DC Voltage Comments (Condition) 
						

							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 in nanohenries (nH) or micro-
henries (µH).
2. DC voltages are measured from point indicated to chassis ground using a Motorola DC multi-
meter or equivalent. If the board has been removed from the chassis, the transmitter module 
mounting screws may be used for ground connection. (Note: The antenna nut bracket is not 
connected to ground.) Operating mode dependent voltages are followed by (RX) for receive 
mode, (TX) for transmit mode, (UNSQ) for unsquelched mode, etc.
3. RF voltages on VHF models are measured with a Fluke model 85 RF probe. The indicated 
voltages expressed in mV (RF) are DC level readings which correspond approximately 1:1 to 
the RF voltage level in mV rms. RF voltages in the Receiver Front End and Receiver Back 
End circuits are measured with an on-channel 100 mV (-7 dBm) RF signal applied to the 
antenna jack J140.
4. RF voltages on UHF models are measured both with a high-impedance RF voltmeter having 
a bandwidth in excess of 500 MHz (levels are expressed in dBm) and with a Fluke model 85 
RF probe [levels are expressed in mV (RF)]. These indicated voltages are DC level readings 
which correspond approximately 1:1 to the RF voltage level in mV rms, and are only approxi-
mate for UHF frequency measurements. RF voltages in the Receiver Front End and Receiver 
Back End circuits are measured with an on-channel 100 mV (-7 dBm) RF signal applied to the 
antenna jack J140.
5. Audio voltages are measured with a high-impedance AC rms voltmeter. The indicated volt-
ages are expressed in mV rms. Receive mode voltages are followed by (RX) and are mea-
sured with an on-channel signal with 1 kHz modulation at 60% deviation (3 kHz for 25 kHz 
channels, or 1.5 kHz for 12.5 kHz channels). Transmit mode voltages are followed by (TX) 
and are measured with a 1 kHz, 10 mV rms signal present at the external microphone input 
(accessory connector J471 pin 4 hot and pin 7 ground).
6. Reference Designators are assigned in the following manner:
Ref. No. Series Circuit Block
1-99RF Front End
100-149 Transmitter RF Stages
150-200Transmitter Power Control
201-250 Frequency Synthesizer
251-300VCO 
						

							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 from ASFIC to TX power control
DEMOD RX audio from backend to ASFIC
BW_SELBackend filter BW select from ASFIC
RSSI RX signal strength indication from IFIC to uP
IF_IN/OUT44.85 MHz from 1st mixer to high IF filter
RF_IN/OUT RX signal from antenna switch to front end
MOD OUT/INTX modulation from ASFIC to synthesizer
16_8_MHZ Ref osc signal from synthesizer to ASFIC
SYNTH_CSSynthesizer chip select from uP
SPI_CLK Serial clock from uP
SPI_DATA_OUTSerial data from uP
LOCK Lock detect indication from synth to uP
PRESCVCO freq feedback from VCOBIC to synth
V_STEER Steering line voltage from synth to VCOs
V_SFSuper-filtered 4.5 volts from synth to VCOBIC
VCO_MOD TX modulation from ASFIC to synthesizer
TRBTX/RX control from synth to VCOBIC
RX_INJ Buffered RX VCO output to RX 1st mixer
TX_INJTX VCO output to transmitter input
Ref. No. Series Circuit Block 
						

							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 (L3)
LAYER 4 (L4)
LAYER 5 (L5)
LAYER 6 (L6)
INNER LAYERS SIDE 1
SIDE 2
MK1
SP11
2
1
2MATES WITH J470 ON
RADIO BOARD
MATES WITH J491 ON
RADIO BOARD 
						

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