Motorola Pr400 Detailed 6881096c25 B Manual

							Table of Contentsix
6881096C25-BJune, 2005
Figure 12-35. UHF (465-495 MHz) Voltage Controlled Oscillator Schematic 
Diagram (8486634Z02-O) ............................................................................................ 12-45
Figure 12-36. UHF (465-495 MHz) Transmitter and Power Control Schematic 
Diagram (8486634Z02-O)............................................................................................ 12-46
Figure 12-37. UHF (465-495 MHz) Controller Interconnect Schematic Diagram (8486634Z02-O).... 12-47
Figure 12-38. UHF (465-495 MHz) Microprocessor  Circuitry Schematic Diagram (8486634Z02-O) 12-48
Figure 12-39. UHF (465-495 MHz) Audio Circuitry Schematic Diagram (8486634Z02-O)................. 12-49
Figure 12-40. UHF (465-495 MHz) DC Regulation Schematic Diagram (8486634Z02-O)................. 12-50
Figure 12-41. UHF (465-495 MHz) Keypad Board Schematic Diagram (8466565A03-B) ................. 12-51
Figure 12-42. UHF (465-495 MHz) Board Top Side View (8486634Z02-O)....................................... 12-52
Figure 12-43. UHF (465-495 MHz) Board Bottom Side View (8486634Z02-O) ................................. 12-53
Figure 12-44. UHF (465-495 MHz) Keypad Board (8466565A03-B) .................................................. 12-54
UHF (465-495 MHz) Radio Parts List (8486634Z02-O) ...................................................................... 12-55
UHF (465-495 MHz) Keypad  Board Parts List (8466565A03-B) ........................................................ 12-58
INDEX ................................................................................... 1-1 
						

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June, 20056881096C25-B
List of Figures
Figure 1-1. Programming/Test Cable.................................................................................................. 1-4
Figure 1-2. Wiring of the Connectors .................................................................................................. 1-4
Figure 2-1. DC Power Distribution Block Diagram .............................................................................. 2-1
Figure 4-1. VHF Receiver Block Diagram ...........................................................................................4-1
Figure 4-2. VHF Transmitter Block Diagram .......................................................................................4-3
Figure 4-3. VHF Frequency Generation Unit Block Diagram .............................................................. 4-5
Figure 4-4. VHF Synthesizer Block Diagram ...................................................................................... 4-6
Figure 4-5. VHF VCO Block Diagram ................................................................................................. 4-7
Figure 4-6. Keypad Block Diagram..................................................................................................... 4-7
Figure 5-1. VHF Receiver Block Diagram ...........................................................................................5-1
Figure 5-2. VHF Transmitter Block Diagram .......................................................................................5-3
Figure 5-3. VHF Frequency Generation Unit Block Diagram .............................................................. 5-5
Figure 5-4. VHF Synthesizer Block Diagram ...................................................................................... 5-6
Figure 5-5. VHF VCO Block Diagram ................................................................................................. 5-7
Figure 5-6. Keypad Block Diagram..................................................................................................... 5-7
Figure 7-1. Six-Layer Circuit Board: Copper Steps in Layer Sequence.............................................. 7-3
Figure 7-2. Speaker and Microphone Schematic................................................................................ 7-3
Figure 7-3. VHF (136-162 MHz) Radio Circuit Block Interconnect Diagram (8486769Z02-A) ........... 7-5
Figure 7-4. VHF (136-162 MHz) Receiver Front End Schematic Diagram (8486769Z02-A) .............. 7-6
Figure 7-5. VHF (136-162 MHz) Receiver Back End Schematic Diagram (8486769Z02-A) .............. 7-7
Figure 7-6. VHF (136-162 MHz) Synthesizer Schematic Diagram (8486769Z02-A) .......................... 7-8
Figure 7-7. VHF (136-162 MHz) Voltage Controlled Oscillator Schematic 
Diagram (8486769Z02-A)................................................................................................. 7-9
Figure 7-8. VHF (136-162 MHz) Transmitter and Power Control Schematic 
Diagram (8486769Z02-A) ............................................................................................... 7-10
Figure 7-9. VHF (136-162 MHz) Controller Interconnect Schematic Diagram (8486769Z02-A) ...... 7-11
Figure 7-10. VHF (136-162 MHz) Microprocessor  Circuitry Schematic Diagram (8486769Z02-A) ... 7-12
Figure 7-11. VHF (136-162 MHz) Audio Circuitry Schematic Diagram (8486769Z02-A) ................... 7-13
Figure 7-12. VHF (136-162 MHz) DC Regulation Schematic Diagram (8486769Z02-A) ................... 7-14
Figure 7-13. VHF (136-162 MHz) Keypad Board Schematic Diagram (8466565A03-A) .................... 7-15
Figure 7-14. VHF (136-162 MHz) Board Top Side View (8486769Z02-A) ......................................... 7-16
Figure 7-15. VHF (136-162 MHz) Board Bottom Side View (8486769Z02-A) .................................... 7-17
Figure 7-16. VHF (136-162 MHz) Keypad Board (8466565A03-B) .................................................... 7-18
Figure 7-17. VHF (136-162 MHz) Radio Circuit Block Interconnect Diagram (8486769Z04-C) ......... 7-23
Figure 7-18. VHF (136-162 MHz) Receiver Front End Schematic Diagram (8486769Z04-C)............ 7-24
Figure 7-19. VHF (136-162 MHz) Receiver Back End Schematic Diagram (8486769Z04-C) ............ 7-25
Figure 7-20. VHF (136-162 MHz) Synthesizer Schematic Diagram (8486769Z04-C) ........................ 7-26
Figure 7-21. VHF (136-162 MHz) Voltage Controlled Oscillator Schematic 
Diagram (8486769Z04-C)............................................................................................... 7-27
Figure 7-22. VHF (136-162 MHz) Transmitter and Power Control Schematic 
Diagram (8486769Z04-C)............................................................................................... 7-28
Figure 7-23. VHF (136-162 MHz) Controller Interconnect Schematic Diagram (8486769Z04-C) ...... 7-29
Figure 7-24. VHF (136-162 MHz) Microprocessor  Circuitry Schematic Diagram (8486769Z04-C) ... 7-30
Figure 7-25. VHF (136-162 MHz) Audio Circuitry Schematic Diagram (8486769Z04-C) ................... 7-31
Figure 7-26. VHF (136-162 MHz) DC Regulation Schematic Diagram (8486769Z04-C) ................... 7-32
Figure 7-27. VHF (136-162 MHz) Keypad Board Schematic Diagram (8466565A03-B) .................... 7-33
Figure 7-28. VHF (136-162 MHz) Board Component Side View (8486769Z04-C) ............................. 7-34
Figure 7-29. VHF (136-162 MHz) Board Solder Side View (8486769Z04-C) ..................................... 7-35
Figure 7-30. VHF (136-162 MHz) Keypad Board (8466565A03-B) .................................................... 7-36
Figure 7-31. VHF (146-174 MHz) Radio Circuit Block Interconnect Diagram (8486342Z13-C) ......... 7-41 
						

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Figure 7-32. VHF (146-174 MHz) Receiver Front End Schematic Diagram (8486342Z13-C) ........... 7-42
Figure 7-33. VHF (146-174 MHz) Receiver Back End Schematic Diagram (8486342Z13-C) ............ 7-43
Figure 7-34. VHF (146-174 MHz) Synthesizer Schematic Diagram (8486342Z13-C)........................ 7-44
Figure 7-35. VHF (146-174 MHz) Voltage Controlled Oscillator Schematic 
Diagram (8486342Z13-C) .............................................................................................. 7-45
Figure 7-36. VHF (146-174 MHz) Transmitter and Power Control Schematic 
Diagram (8486342Z13-C).............................................................................................. 7-46
Figure 7-37. VHF (146-174 MHz) Controller Interconnect Schematic Diagram (8486342Z13-C) ...... 7-47
Figure 7-38. VHF (146-174 MHz) Microprocessor  Circuitry Schematic Diagram (8486342Z13-C)... 7-48
Figure 7-39. VHF (146-174 MHz) Audio Circuitry Schematic Diagram (8486342Z13-C) ................... 7-49
Figure 7-40. VHF (146-174 MHz) DC Regulation Schematic Diagram (8486342Z13-C) ................... 7-50
Figure 7-41. VHF (146-174 MHz) Keypad Board Schematic Diagram (8466565A03-B).................... 7-51
Figure 7-42. VHF (146-174 MHz) Board, Top Side (8486342Z13-C)................................................. 7-52
Figure 7-43. VHF (146-174 MHz) Board, Bottom Side (8486342Z13-C)............................................ 7-53
Figure 7-44. VHF (146-174 MHz) Keypad Board (8466565A03-B) .................................................... 7-54
Figure 7-45. VHF (146-174 MHz) Radio Circuit Block Interconnect Diagram (8486769Z04-C) ......... 7-59
Figure 7-46. VHF (146-174 MHz) Receiver Front End Schematic Diagram (8486769Z04-C) ........... 7-60
Figure 7-47. VHF (146-174 MHz) Receiver Back End Schematic Diagram (8486769Z04-C) ............ 7-61
Figure 7-48. VHF (146-174 MHz) Synthesizer Schematic Diagram (8486769Z04-C)........................ 7-62
Figure 7-49. VHF (146-174 MHz) Voltage Controlled Oscillator Schematic 
Diagram (8486769Z04-C) .............................................................................................. 7-63
Figure 7-50. VHF (146-174 MHz) Transmitter and Power Control Schematic 
Diagram (8486769Z04-C).............................................................................................. 7-64
Figure 7-51. VHF (146-174 MHz) Controller Interconnect Schematic Diagram (8486769Z04-C) ...... 7-65
Figure 7-52. VHF (146-174 MHz) Microprocessor  Circuitry Schematic Diagram (8486769Z04-C)... 7-66
Figure 7-53. VHF (146-174 MHz) Audio Circuitry Schematic Diagram (8486769Z04-C) ................... 7-67
Figure 7-54. VHF (146-174 MHz) DC Regulation Schematic Diagram (8486769Z04-C) ................... 7-68
Figure 7-55. VHF (146-174 MHz) Keypad Board Schematic Diagram (8466565A03-B).................... 7-69
Figure 7-56. VHF (146-174 MHz) Board Component Side View (8486769Z04-C)............................. 7-70
Figure 7-57. VHF (146-174 MHz) Board Solder Side View (8486769Z04-C) ..................................... 7-71
Figure 7-58. VHF (146-174 MHz) Keypad Board (8466565A03-B) .................................................... 7-72
Figure 8-1. UHF Receiver Block Diagram ..........................................................................................8-1
Figure 8-2. UHF Transmitter Block Diagram ...................................................................................... 8-3
Figure 8-3. UHF Frequency Generation Unit Block Diagram ............................................................. 8-5
Figure 8-4. UHF Synthesizer Block Diagram ...................................................................................... 8-6
Figure 8-5. UHF VCO Block Diagram ................................................................................................. 8-7
Figure 8-6. Keypad Block Diagram ..................................................................................................... 8-7
Figure 9-1. UHF Receiver Block Diagram ..........................................................................................9-1
Figure 9-2. UHF Transmitter Block Diagram ...................................................................................... 9-3
Figure 9-3. UHF Frequency Generation Unit Block Diagram ............................................................. 9-5
Figure 9-4. UHF Synthesizer Block Diagram ...................................................................................... 9-6
Figure 9-5. UHF VCO Block Diagram ................................................................................................. 9-7
Figure 9-6. Keypad Block Diagram ..................................................................................................... 9-7
Figure 10-1. UHF Receiver Block Diagram ........................................................................................ 10-1
Figure 10-2. UHF Transmitter Block Diagram .................................................................................... 10-3
Figure 10-3. UHF Frequency Generation Unit Block Diagram ........................................................... 10-5
Figure 10-4. UHF Synthesizer Block Diagram .................................................................................... 10-6
Figure 10-5. UHF VCO Block Diagram ...............................................................................................10-7
Figure 10-6. Keypad Block Diagram ................................................................................................... 10-7
Figure 12-1. Six-Layer Circuit Board: Copper Steps in Layer Sequence ........................................... 12-3
Figure 12-2. Speaker and Microphone Schematic ............................................................................. 12-3
Figure 12-3. UHF (403-440 MHz) Radio Circuit Block Diagram (8486635Z03-O) ............................. 12-5
Figure 12-4. UHF (403-440 MHz) Receiver Front End Schematic Diagram (8486635Z03-O) ........... 12-6
Figure 12-5. UHF (403-440 MHz) Receiver Back End Schematic Diagram (8486635Z03-O) ........... 12-7 
						

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June, 20056881096C25-B
Figure 12-6. UHF (403-440 MHz) Synthesizer Schematic Diagram (8486635Z03-O) ....................... 12-8
Figure 12-7. UHF (403-440 MHz) Voltage Controlled Oscillator Schematic 
Diagram (8486635Z03-O).............................................................................................. 12-9
Figure 12-8. UHF (403-440 MHz) Transmitter and Power Control Schematic 
Diagram (8486635Z03-O) ............................................................................................ 12-10
Figure 12-9. UHF (403-440 MHz) Controller Interconnect Schematic Diagram (8486635Z03-O) .... 12-11
Figure 12-10. UHF (403-440 MHz) Microprocessor  Circuitry Schematic Diagram (8486635Z03-O) 12-12
Figure 12-11. UHF (403-440MHz) Audio Circuitry Schematic Diagram (8486635Z03-O) .................. 12-13
Figure 12-12. UHF (403-440 MHz) DC Regulation Schematic Diagram (8486635Z03-O) ................. 12-14
Figure 12-13. UHF (403-440 MHz) Keypad Board Schematic Diagram (8466565A03-B).................. 12-15
Figure 12-14. UHF (403-440 MHz) Board Top Side View (8486635Z03-O) ....................................... 12-16
Figure 12-15. UHF (403-440 MHz) Board Bottom Side View (8486635Z03-O).................................. 12-17
Figure 12-16. UHF (403-440 MHz) Keypad Board (8466565A03-B) .................................................. 12-18
Figure 12-17. UHF (438-470 MHz) Radio Circuit Block Diagram (8486348Z13-C) ............................ 12-23
Figure 12-18. UHF (438-470 MHz) Receiver Front End Schematic Diagram (8486348Z13-C) ......... 12-24
Figure 12-19. UHF (438-470 MHz) Receiver Back End Schematic Diagram (8486348Z13-C) .......... 12-25
Figure 12-20. UHF (438-470 MHz) Synthesizer Schematic Diagram (8486348Z13-C)...................... 12-26
Figure 12-21. UHF (438-470 MHz) Voltage Controlled Oscillator Schematic 
Diagram (8486348Z13-C)............................................................................................. 12-27
Figure 12-22. UHF (438-470 MHz) Transmitter and Power Control Schematic 
Diagram (8486348Z13-C)............................................................................................. 12-28
Figure 12-23. UHF (438-470 MHz) Controller Interconnect Schematic Diagram (8486348Z13-C) .... 12-29
Figure 12-24. UHF (438-470 MHz) Microprocessor  Circuitry Schematic Diagram (8486348Z13-C). 12-30
Figure 12-25. UHF (438-470 MHz) Audio Circuitry Schematic Diagram (8486348Z13-C) ................. 12-31
Figure 12-26. UHF (438-470 MHz) DC Regulation Schematic Diagram (8486348Z13-C) ................. 12-32
Figure 12-27. UHF (438-470 MHz) Keypad Option Schematic Diagram (8466565A03-B)................. 12-33
Figure 12-28. UHF (438-470 MHz) Board Top Side View (8486348Z13-C) ....................................... 12-34
Figure 12-29. UHF (438-470 MHz) Board Bottom Side View (8486348Z13-C) .................................. 12-35
Figure 12-30. UHF (438-470 MHz) Keypad Board (8466565A03-B) .................................................. 12-36
Figure 12-31. UHF (465-495 MHz) Radio Circuit Block Diagram (8486634Z02-O)............................ 12-41
Figure 12-32. UHF (465-495 MHz) Receiver Front End Schematic Diagram (8486634Z02-O) ......... 12-42
Figure 12-33. UHF (465-495 MHz) Receiver Back End Schematic Diagram (8486634Z02-O).......... 12-43
Figure 12-34. UHF (465-495 MHz) Synthesizer Schematic Diagram (8486634Z02-O) ..................... 12-44
Figure 12-35. UHF (465-495 MHz) Voltage Controlled Oscillator Schematic 
Diagram (8486634Z02-O)............................................................................................ 12-45
Figure 12-36. UHF (465-495 MHz) Transmitter and Power Control Schematic 
Diagram (8486634Z02-O) ............................................................................................ 12-46
Figure 12-37. UHF (465-495 MHz) Controller Interconnect Schematic Diagram (8486634Z02-O) .... 12-47
Figure 12-38. UHF (465-495 MHz) Microprocessor  Circuitry Schematic Diagram (8486634Z02-O) 12-48
Figure 12-39. UHF (465-495 MHz) Audio Circuitry Schematic Diagram (8486634Z02-O) ................. 12-49
Figure 12-40. UHF (465-495 MHz) DC Regulation Schematic Diagram (8486634Z02-O) ................. 12-50
Figure 12-41. UHF (465-495 MHz) Keypad Board Schematic Diagram (8466565A03-B).................. 12-51
Figure 12-42. UHF (465-495 MHz) Board Top Side View (8486634Z02-O) ....................................... 12-52
Figure 12-43. UHF (465-495 MHz) Board Bottom Side View (8486634Z02-O).................................. 12-53
Figure 12-44. UHF (465-495 MHz) Keypad Board (8466565A03-B) .................................................. 12-54 
						

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6881096C25-BJune 6, 2005
List of Tables
Table 1-1. Recommended Test Equipment ....................................................................................... 1-1
Table 1-2. Service Aids ..................................................................................................................... 1-2
Table 1-3. Recommended Service Tools .......................................................................................... 1-2
Table 2-1. Voltage Regulators ........................................................................................................... 2-2
Table 3-1. Radio Memory Requirements........................................................................................... 3-1
Table 3-2. SPI Bus Signal Definitions................................................................................................ 3-2
Table 6-1. Troubleshooting Table for Receiver ................................................................................. 6-1
Table 6-2. Troubleshooting Table for Synthesizer............................................................................. 6-3
Table 6-3. Troubleshooting Table for Transmitter ............................................................................. 6-4
Table 6-4. Troubleshooting Table for Board and IC Signals ............................................................. 6-7
Table 11-1. Troubleshooting Table for Receiver ............................................................................... 11-1
Table 11-2. Troubleshooting Table for Synthesizer........................................................................... 11-3
Table 11-3. Troubleshooting Table for Transmitter ........................................................................... 11-4
Table 11-4. Troubleshooting Table for Board and IC Signals ........................................................... 11-6
Related Publications
PR400 Basic Service Manual ......................................................................................................... 6881096C24
PR400 Non-Display User Guide ..................................................................................................... 6881096C27
PR400 Half-Keypad User Guide ..................................................................................................... 6881096C26
PR400 Full-Keypad User Guide...................................................................................................... 6881096C23
Product Safety and RF Exposure Compliance ............................................................................... 6881095C98
PR400 User Guide CDROM .............................................................................................................. HKLN4219 
						

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June, 20056881096C25-B 
						

							Chapter 1 Test Equipment, Service Aids, and 
Service Tools
1.1 Test Equipment
Table 1-1 lists test equipment required to service the PR400 Radios.
Table 1-1.  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, 32-segment bar 
graph with backlit displayDigital voltmeter is recom-
mended for AC/DC voltage and 
current measurements
Fluke 85 RF probe500 MHz, 30 VAC maxUse with Fluke 87 digital multi-
meter for RF voltage measure-
ments.
*R1377A AC voltmeter 1 mV to 300 mV, 10 mega-
ohm input impedanceAudio voltage measurements
R1611ADual channel 
100 MHz oscillo-
scope (Agillent)Two-channel, 100 MHz 
bandwidth, 200 M sample 
rate/sec, 2 MB memory/
channelWaveform measurements
S1339A RF millivolt meter 100 µV to 3V RF, 10 kHz to 
1 GHz frequency rangeRF level measurements
*R1013B or
*R1370ASINAD meter or
SINAD meter with 
RMSWithout RMS audio voltme-
ter or
With RMS audio voltmeterReceiver sensitivity measure-
ments 
						

							June, 20056881096C24-B
1-2Test Equipment, Service Aids, and Service Tools: Service Aids
1.2 Service Aids
Ta b l e  1 - 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 1-2.  Service Aids 
Motorola Part 
No.Description Application
RLN4460Po r ta ble  Tes t Se tEnables connection to the audio/accessory jack. 
Allows switching for radio testing.
RLN4510 Battery Interface Regulates DC current and voltage between radio and 
power supply.
RVN4191Customer Programming Soft-
ware and Global Tuner Software 
on CD RomProgram customer option and channel data.
AAPMKN4004 Programming Test Cable Connects radio to RIB (PLN4008).
AAPMKN4003Radio-to-Radio Cloning CableAllows a radio to be duplicated from a master radio by 
transferring programmed data from the master radio to 
the other.
RLN4008 Radio Interface Box Enables communications between the radio and the 
computer’s serial communications adapter.
5886564Z01RF AdaptorAdapts radio’s antenna port to BNC cabling of test 
equipment.
0180305K08 Shop Battery Eliminator Interconnects radio to power supply. 
HSN9412Wall-Mounted Power SupplyUsed to supply power to the RIB (120 VAC).
3080369B71 or 
3080369B72Computer Interface Cable Use B72 for the IBM PC AT or newer (9-pin serial 
port). Use B71 for older models (25-pin serial port). 
Connects the computer’s serial communications 
adapter to the RIB (PLN4008).
6686533Z01Knob Remover/Chassis OpenerUsed to remove the front cover assembly.
HKN9216 IBM Computer Interface Cable Connection from computer to RIB.
8180384N65Housing EliminatorAllows testing of the radio outside of the housing.
Table 1-3.  Recommended Service Tools 
Motorola Part 
No.Description Application
RSX4043ATORX screwdriverTighten and remove chassis screws
6680387A70 T6 TORX bit Removable TORX screwdriver bit
R1453ADigital readout solder stationDigitally controlled soldering iron
RLN4062A Hot air workstation, 120 V Tool for hot air soldering/desoldering of surface 
mounted integrated circuits 
						

							6881096C24-BJune 6, 2005
Test Equipment, Service Aids, and Service Tools: Service Aids 1-3
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 mount removal and assembly of surface 
mounted integrated circuits and/or rework station 
shields. Includes 5 nozzles.
R1321AChipMaster (220 V)
ChipMaster Nozzles:
6680332E83PLCC-28* nozzle
Soldering and Un-soldering IC’s 6680332E82 PLCC-44* nozzle
6680332E94PLCC-52 nozzle
6680332E96 PLCC-84 nozzle
6680334E67QFP-160 nozzle
6680333E46 SOL-18 nozzle
6680332E84SOIC-20 nozzle
6680332E87 SOL-20J nozzle
6680333E45SOL-24 nozzle
6680333E55 TSOP-64 nozzle
* Included with ChipMaster packages
Table 1-3.  Recommended Service Tools  (Continued)
Motorola Part 
No.Description Application 
						

							June, 20056881096C24-B
1-4Test Equipment, Service Aids, and Service Tools: Service Aids
Programming/Test Cable
Figure 1-1.  Programming/Test Cable
Figure 1-2.  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
2.5mm
Center
P3
25 pin Female
D Connector
1
15
4
11
1
2
3
4 5 3.5mm mono
2.5mm stereo
To Test Box
To Test  Box