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Maintenance 3-13 NOTE: The CPS may display a warning dialog box when you attempt to write the codeplug back to the radio. It is safe to ignore this warning. Press the OK button. 3.7.8 Option Board Installation 1. With the keypad retainer removed the keypad backer board can be removed without the use of tools. 2. Remove the jumper flex from the connector on the keypad board. Notice the orientation of the flex to the connector. Arrows on the jumper flex point to the correct way of inserting the flex into the connector. 3. Discard the keypad backer board. 4. The "breakaway" tab at the top of all option boards contains an extra row of keys and is used to accommodate other radio models. 5. Break-off and discard the option board tab, taking care not to damage the option board. Trim any tab fragments that may remain on the option board. Retainer Keypad/ Option Board Jumper Flex TO KP Display Flex Figure 3-11: Changing Keypad/PassPort Board /Option Boards 6. Reassemble the option board to the front cover assembly. 7. Insert the display flex circuit into the connector on the option board. 8. Insert the jumper flex circuit into the connector on the option board. Notice the orientation of the flex circuit. Arrows on the jumper flex point to the correct way of inserting the flex into the connector. 9. Replace the retainer by placing the two top hooks into the slots below the speaker in the front cover; then, pivot the retainer into the front cover. Ensure that all four tab arms snap correctly into the front cover. 10. With the keypad option board, display, and retainer correctly in place, the front cover assembly can now be reassembled per paragraph 3.7.6.

Section	Page
Foreword	2
Product Safety and RF Exposure Compliance	2
Computer Software Copyrights	2
Document Copyrights	2
Disclaimer	2
Trademarks	2
Table of Contents	3
Foreword ii	3
List of Figures ix	3
List of Tables xi	3
Introduction 1-1	3
Intrinsically Safe Radio Information 2-1	3
Maintenance 3-1	3
Transceiver Performance Testing 4-1	5
Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and...	5
Power Up Self-Test 6-1	5
Accessories 7-1	6
Model Chart and Test Specifications 8-1	6
Glossary Glossary-1	7
List of Figures	9
List of Tables	11
Chapter 1	13
Introduction	13
1.1 Scope of Manual	13
1.2 Warranty and Service Support	13
1.2.1 Warranty Period and Return Instructions	13
1.2.2 After Warranty Period	13
1.3 Radio Model Information	16
Chapter 2	17
Intrinsically Safe Radio Information	17
2.1 FMRC Approved Equipment	17
2.2 Repair of FMRC Approved Products	18
2.2.1 Repair	18
2.2.2 Relabeling	18
2.2.3 Do Not Substitute Options or Accessories	19
Chapter 3	21
Maintenance	21
3.1 Introduction	21
3.2 Preventive Maintenance	21
3.2.1 Inspection	21
3.2.2 Cleaning Procedures	21
3.3 Safe Handling of CMOS and LDMOS Devices	22
3.4 Repair Procedures and Techniques — General	22
3.5 Disassembling and Reassembling the Radio — General	23
3.6 Detailed Radio Disassembly	24
3.6.1 Front Cover from Chassis Disassembly	24
3.6.2 Chassis Assembly/Disassembly	26
3.6.3 Keypad, Display, and Keypad/PassPort/Option Board Disassembly	26
3.6.4 Speaker, Microphone, and Universal Connector Flex Disassembly	28
3.6.5 PTT Disassembly	29
3.6.6 Control Top Disassembly	29
3.7 Detailed Radio Reassembly	30
3.7.1 Control Top Reassembly	30
3.7.2 PTT Reassembly	30
3.7.3 Speaker, Microphone, and Universal Connector Flex Reassembly	30
3.7.4 Keypad, Display, and Keypad/PassPort/Option Board Reassembly	30
3.7.5 Chassis Assembly Reassembly	31
3.7.6 Chassis and Front Cover Reassembly	31
3.7.7 DTMF Retrofit Kit Procedure (Optional Upgrade Procedure)	32
3.7.8 Option Board Installation	33
3.8 HT750 Radio Exploded Mechanical View and Parts List	37
3.10 Test Equipment	38
3.11 Configuring and Wiring the Programming/Test Cable	39
Chapter 4	41
Transceiver Performance Testing	41
4.1 General	41
4.2 RF Test Mode	41
4.3 Test Frequencies for Display and Non-Display Radios	46
4.4 Receiver Performance Tests	47
Chapter 5	49
Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and...	49
5.1 Introduction	49
5.2 Global Radio Tuning Setup	50
5.2.1 Initial Test Equipment Setup	50
5.3 CPS Programming Setup	51
5.4 Cloning (Conventional and LTR)	51
5.4.1 Error Codes (Display Radios Only)	52
5.5 Cloning (Privacy Plus)	52
5.6 Cloning (PassPort)	53
5.7 Lowband Molded Antenna Cut Chart	54
5.8 HT1250•LS+ PassPort Tone Options	55
5.9 HT1250•LS+ Special Diagnostic Functions	55
Chapter 6	57
Power Up Self-Test	57
6.1 Error Codes - Conventional and LTR Radios	57
6.2 Error Codes - Privacy Plus	58
6.3 Error Codes - PassPort	59
6.4 Operation Display Codes	59
Chapter 7	61
Accessories	61
7.1 HT750/HT1250/HT1250•LS/HT1250•LS+/HT1550•XLS/MTX850/ MTX950/MTX850•LS/MTX8250/MTX9250/MTX8250...	61
7.1.1 Antennas	61
7.1.2 Carrying Accessories	62
7.1.3 Carry Cases	62
7.1.4 Chargers	63
7.1.5 Vehicular Accessories	63
7.1.6 Batteries	63
7.1.7 Adapters	63
7.1.8 Miscellaneous	63
7.1.9 Service Aids	64
7.1.10 Audio Accessories	64
7.1.11 Option Boards* (All option boards below are not compatible with HT1550•XLS)	65
7.1.12 Remote Speaker Microphones	65
7.1.13 Manuals	65
7.1.14 Retrofit Front Cover Kits	65
Chapter 8	67
Model Chart and Test Specifications	67
8.1 UHF 403–470 MHz (Conventional)	67
8.2 UHF 450–512 MHz (Conventional)	68
8.3 UHF 403–470 MHz (LTR and PassPort)	69
8.4 UHF 450–512 MHz (LTR and PassPort)	70
8.5 UHF 403–470 MHz (Conventional/LTR)	71
8.6 UHF 450–512 MHz (Conventional/LTR)	72
8.7 VHF 136–174 MHz	73
8.8 VHF 136–174 MHz (Conventional/LTR)	74
8.9 VHF, 136–174 MHz (LTR & PassPort)	75
8.10 LowBand 29.7–42/35–50 MHz	76
8.11 800 MHz (LTR)	77
8.12 800 MHz (Privacy Plus)	77
8.13 900 MHz (Privacy Plus)	78
8.14 Specifications, HT750 Radio	79
8.15 Specifications, HT1250 Radio	81
8.16 Specifications, HT1250•LS+ Radio	83
8.17 Specifications, HT1550•XLS Radio	85
8.18 Specifications, MTX850/MTX8250 (800 MHz), MTX950/MTX9250 (900 MHz) Radios	87
8.19 Specifications, MTX850•LS and MTX8250•LS (800 MHz) Radios	89

Match case Limit results 1 per page

Maintenance

3-13

3.7.8

Option Board Installation

With the keypad retainer removed the keypad backer board can be removed without the use of

tools.

Remove the jumper flex from the connector on the keypad board. Notice the orientation of the flex

to the connector. Arrows on the jumper flex point to the correct way of inserting the flex into the

connector.

Discard the keypad backer board.

The “breakaway” tab at the top of all option boards contains an extra row of keys and is used to

accommodate other radio models.

Break-off and discard the option board tab, taking care not to damage the option board. Trim any

tab fragments that may remain on the option board.

Figure 3-11: Changing Keypad/PassPort Board /Option Boards

Reassemble the option board to the front cover assembly.

Insert the display flex circuit into the connector on the option board.

Insert the jumper flex circuit into the connector on the option board. Notice the orientation of the

flex circuit. Arrows on the jumper flex point to the correct way of inserting the flex into the

connector.

Replace the retainer by placing the two top hooks into the slots below the speaker in the front

cover; then, pivot the retainer into the front cover. Ensure that all four tab arms snap correctly into

the front cover.

10.

With the keypad option board, display, and retainer correctly in place, the front cover assembly

can now be reassembled per paragraph 3.7.6.

NOTE:

The CPS may display a warning dialog box when you attempt to write the codeplug

back to the radio. It is safe to ignore this warning. Press the OK button.

TO KP

Retainer

Jumper

Flex

Keypad/

Option

Board

Display

Flex