Motorola Pr400 Basic 6881096c24 A Manual

6881096C24-AAugust, 2004
Model Charts and Test Specifications: MIL Standards 1-9
1.9 MIL Standards
Table 1-2.  MIL STDS 810 C, D, E, and F: Applicable to UHF and VHF Specifications (8.2 and 8.4)    
Military Standards 810 C, D, E, & F: Parameters/Methods/Procedures
810C810D810E810F
Applicable 
MIL-STDMethods Procedures Methods Procedures Methods Procedures Methods Procedures
Low 
Pressure500.11500.22500.32500.41
High Temper-
ature501.1 1,2 501.2 1,2 501.3 1,2 501.4 1,2
Low...

August, 20046881096C24-A
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1-10Model Charts and Test Specifications: MIL Standards 

Chapter 2 Theory Of Operation
2.1 Introduction
This chapter provides a basic theory of operation for the radio components.
2.2 Major Assemblies
• Transceiver Board – contains all transmit, receive, and audio circuitry.
• Display (Limited and Full Keypad models only) – 8 characters (14 segments star burst) and 10 
icons with backlighting, liquid-crystal display (LCD).
Keypad Board (Limited and Full Keypad models only) –
Limited Keypad: a 2-button menu keypad with 2-way navigation button,
Full Keypad: a...

July, 20046881096C24-A
2-2Theory Of Operation: Major Assemblies
The IFIC is a low-voltage monolithic FM IF system incorporating a mixer/oscillator, two limiting IF 
amplifiers, quadrature detector, logarithmic received signal strength indicator (RSSI), voltage 
regulator and audio, and RSSI Op Amps. The second LO frequency, 44.395 MHz, is determined by a 
crystal oscillator. The second mixer converts the 44.85 MHz high IF frequency to 455 kHz.
Additional IF selectivity is provided by two ceramic filters....

Chapter 3 Test Equipment, Service Aids, and 
Service Tools
3.1 Test Equipment
Table 3-1 lists test equipment required to service the PR400 Radios.
Table 3-1.  Recommended Test Equipment 
Motorola Part No. Description Characteristics Application
R2600 seriesSystem analyzerThis item will substitute for 
items with an asterisk (*)Frequency/deviation meter and 
signal generator for wide-range 
troubleshooting and alignment
*R1074A Fluke 87 digital multi-
meterTrue RMS metering, 
200 kHz frequency 
counter,...

July 21, 20046881096C24-A
3-2Test Equipment, Service Aids, and Service Tools: Service Aids
3.2 Service Aids
Ta b l e  3 - 2 lists service aids recommended for working on the PR400 Radios. While all of these items 
are available from Motorola, most are standard shop equipment items, and any equivalent item 
capable of the same performance may be substituted for the item listed.
Table 3-2.  Service Aids 
Motorola Part 
No.Description Application
RLN4460Po r ta ble  Tes t Se tEnables connection to the...

6881096C24-AJuly, 2004
Test Equipment, Service Aids, and Service Tools: Service Aids 3-3
0180386A78Illuminated magnifying glass with 
lens attachment
Illumination and magnification of components
0180302E51 Master lens system
0180386A82Anti-static grounding kitUsed during all radio assembly and disassembly pro-
cedures
6684253C72 Straight prober
6680384A98Brush
1010041A86 Solder (RMA type), 63/67, 
0.5mm diameter, 1 lb. spool
0180303E45SMD tool kit (included with 
R1319A)
R1319A ChipMaster (110 V) Surface...

July 21, 20046881096C24-A
3-4Test Equipment, Service Aids, and Service Tools: Service Aids
Programming/Test Cable
Figure 3-1.  Programming/Test Cable
Figure 3-2.  Wiring of the Connectors
25 POSITION
FEMALE CONNECTOR 25 POSITION
MALE CONNECTOR
36.0”
CABLE
36.0”
CABLE
P1 P2 P3
P2
25 pin Male D Connector
Components molded inside
1
5
24
7
20
8
15
16
9
47
ohm
33K
+
1UF,16V 5% Orange
Blue
White
Spiral
Yellow
P1
2.5mm stereo and
3.5mm
1
2
5
3
4
3.5mm Tip
(Speaker +)
3.5mm
Sleeve
2.5mm Tip
(Microphone)
2.5mm...

Chapter 4 Performance Checks
4.1 General
These radios meet published specifications through their manufacturing process by utilizing high- 
accuracy laboratory-quality test equipment. The recommended field service equipment is as accurate 
as the manufacturing equipment with few exceptions. This accuracy must be maintained in 
compliance with the manufacturer’s recommended calibration schedule.
4.2 Power-Up Self Test
Applying power to the radio by using the on/off volume control, starts a self-test...

July, 20046881096C24-A
4-2Performance Checks: RF Test Mode
Supply voltage can be connected from the battery eliminator. The equipment required for alignment 
procedures is connected as shown in the Radio Performance Checks Setup diagram (Figure 4-1).
Initial equipment control settings should be as indicated in Table 4-1 and should be the same for all 
performance checks and tuner alignment procedures.
4.3 RF Test Mode
When the PR400 radio is operating in its normal environment, the radios microcomputer...