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751x (VHF)
754x (UHF)
CONVENTIONAL
TWO-WAY RADIO
VHF 136-150 and 146-174 MHz
UHF 400-430, 440-470, 470-500, and 490-512 MHz
©
Copyright
1999 by the E.F. Johnson Company
E.F. Johnson Company, which was founded in 1923, designs, manufactures, and markets
radio communication products, systems, and services worldwide. E.F. Johnson produces
equipment for land mobile radio and mobiletelephone services which include business,
industrial, government, public safety, and personal users.
Viking Head/EFJohnson® logo and Call Guard® are registered trademarks of the E.F.
Johnson Company. Smartrunk II™ is a trademark of Smartrunk Systems Inc. All other
company and/or product names used in this manual are trademarks and/or registered
trademarks of their respective manufacturer.
Information in this manual is subject to change without notice.
1 and 5 Watts, 9.6 VDC
1 and 4 Watts, 9.6 VDC
Revised July 1999
Part No. 001-7500-002
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Summary of Contents for E.F. Johnson Company 751 series
- Page 1 Copyright 1999 by the E.F. Johnson Company E.F. Johnson Company, which was founded in 1923, designs, manufactures, and markets radio communication products, systems, and services worldwide. E.F. Johnson produces equipment for land mobile radio and mobiletelephone services which include business, industrial, government, public safety, and personal users.
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Page 2: Table Of Contents
TABLE OF CONTENTS GENERAL INFORMATION Scan ........2-4 Key Beep . - Page 3 TABLE OF CONTENTS (CONT’D) First Mixer and First IF Circuit ... . . 4-1 UHF MODELS Second IF and Demodulator Circuits ..4-1 AF Circuit .
- Page 4 TABLE OF CONTENTS (CONT’D) LIST OF FIGURES LIST OF TABLES Option Unit Installation ....1-3 75xx Accessories......1-2 Two-Tone Decoder Adjustment Points .
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Page 5: General Information
1.6 PRODUCT WARRANTY The warranty statement for this transceiver is available from your product supplier or from the Warranty Department, E.F. Johnson Company, 299 1.3 PART NUMBER BREAKDOWN Johnson Avenue, P.O. Box 1249, Waseca, MN 56093- 0514. This information may also be requested from the... -
Page 6: Factory Customer Service
The 2-tone decoder kit 585-7500-025 mailing address is as follows: 5-tone kit 585-7500-026 Scrambler, Transcrypt® SC-20-4xx SC20-4xx E.F. Johnson Company Customer Service Department Programming Accessories 299 Johnson Avenue Programming software, 3-1/2 disk 585-7500-030 P.O. Box 1249 Programming cable, computer-xcvr... -
Page 7: Factory Returns
Clearly describe the difficulty experienced in The E.F. Johnson Company has a site on the the space provided and also note any prior physical World Wide Web that can be accessed for information damage to the equipment. -
Page 8: Two-Tone Decoder Setup
GENERAL INFORMATION TWO-TONE DECODER PART NO. 585-7500-025 SETUP INSTRUCTIONS 1.12 TWO-TONE DECODER SETUP 1.12.2 SETTING TONE FREQUENCIES 1.12.1 INSTALLATION AND PROGRAMMING 1. Connect an RF signal generator to the antenna jack. Set it to the frequency of a channel programmed for 1. -
Page 9: Five-Tone Encoder/Decoder Setup
GENERAL INFORMATION FIVE-TONE ENCODER/DECODER PART NO. 585-7500-026 SETUP INSTRUCTIONS • 1.13 FIVE-TONE ENCODER/DECODER SETUP “Key & Display Assign” and program Tx Code and Call switches for use in transmitting 5-tone 1.13.1 INSTALLATION AND PROGRAMMING codes. 1. Remove the battery pack from the transceiver and install the module in the cavity under the rubber 1.13.2 SETTING 5-TONE DEVIATION cover as described in Section 1.11. -
Page 10: Radio Disassembly Procedure
GENERAL INFORMATION TRANSCEIVER DISASSEMBLY INSTRUCTIONS 1.14 RADIO DISASSEMBLY PROCEDURE 1.14.1 REMOVING CHASSIS Refer to Figure 1-3 and proceed as follows: 1. Remove nut “A” (see following note) and knob “B”. Then remove two screws “C”. NOTE: A locking compound has been applied to the antenna jack spanner nut. -
Page 11: Revision Summary
GENERAL INFORMATION REVISION SUMMARY • 1.15 REVISION SUMMARY The operation of several features has been changed to improve performance. 1.15.1 GENERAL • Support has been added for an optional scrambler This service manual covers revisions made to the and output port. However, those particular options Falcon™... -
Page 12: Specifications
GENERAL INFORMATION 7510 (VHF) AND 7540 (UHF) SPECIFICATIONS The following are general specifications intended for use in testing and servicing this transceiver. For current advertised specifications, refer to the specification sheet available from your sales representative. Values are typical and are subject to change without notice. GENERAL Frequency Range VHF: 136-150 or 146-174 MHz... -
Page 13: Transceiver Operation
TRANSCEIVER OPERATION SECTION 2 TRANSCEIVER OPERATION Speaker/Mic Speaker/Mic On-Off/Volume On-Off/Volume Jack Jack Antenna Antenna PTT Switch PTT Switch Speaker Speaker Microphone Microphone Transmit Transmit Channel Indicator Channel Indicator Select Select Charging Charging Jack Jack Display Display Programmable Number Programmable Keys Keypad Keys STANDARD MODEL... -
Page 14: Getting Started
TRANSCEIVER OPERATION 2.3.3 BELT CLIP A-D keys are available on DTMF keypad models only). Refer to the descriptions in Section 2.5 for more information. The belt clip is attached as shown below. Display - Indicates the selected channel, operating modes, and error conditions. Charging Jack - The optional wall charger or cigarette lighter or DC cables can be plugged into this jack to charger the battery (see Sections 2.6.7 and 2.6.8). -
Page 15: Adjusting Volume
TRANSCEIVER OPERATION 2.3.6 ADJUSTING VOLUME 2.4.3 LOW BATTERY INDICATION To adjust the volume, rotate the on-off/volume When a low battery condition is detected, control while a message is being received. To adjust displayed continuously. The battery will require while no message is being received, press and hold the recharging soon. -
Page 16: Programmable Functions
TRANSCEIVER OPERATION function previously described then transmits the pre- from being accidentally pressed. Some channels may programmed 5-tone code. be programmed so that this feature is not available. To toggle this function, press for 1 second the switch pro- Manual 5-Tone Codes grammed for the Keypad Lock function. -
Page 17: Talk-Around
TRANSCEIVER OPERATION 2.5.10 HIGH/LOW POWER OUTPUT programmed so all messages are heard, press and hold the switch to hear all messages. If only messages intended for you are heard, press the switch momen- This function selects high or low power output on tarily to select the audible condition. -
Page 18: Miscellaneous Battery Information
TRANSCEIVER OPERATION BATTERY CASE CAUTIONS BATTERY CAUTIONS If using nickel-cadmium batteries, make sure all NEVER incinerate used battery packs because they cells are the same brand, type, and capacity. Never may explode. mix old and new cells. Failure to observe these pre- cautions may cause a fire hazard or transceiver NEVER immerse the battery pack in water. -
Page 19: Using Desktop Charger
TRANSCEIVER OPERATION 2.6.6 USING MULTI-UNIT CHARGER source instead of the AC adapter supplied with the desktop charger (see following). The multi-unit charger is shown in the following 2.6.5 USING DESKTOP CHARGER illustration. Each charger slot functions like the desk- top charger described in the preceding section. There- The optional desktop charger shown below is fore, the “Caution”, charge time, and indicator opera- available in the following versions. -
Page 20: Using Optional Cables
TRANSCEIVER OPERATION Do have transceiver power turned on when this tional battery case is being used with alkaline or charger is used. The charge current is insufficient to other dry cell batteries installed. Attempting to operate the transceiver and charge the battery pack. charge these batteries may damage the transceiver or batteries. -
Page 21: Programming
PROGRAMMING SECTION 3 PROGRAMMING Programming Cable Part No. 585-7500-031 Female DB9 Plug To Computer (Includes Level Conv. Circuit) Figure 3-1 Programming Setup 3.1 GENERAL This cable has a female DB9 connector which plugs into the serial port of the computer. In this connector is 3.1.1 PROGRAMMING SETUP a level converter circuit which converts the RS-232 levels of the computer to the logic levels required by... -
Page 22: Software Version Required
PROGRAMMING 3.3 SPECIAL KEYS AND FUNCTIONS These are DOS programs, so Windows® 3.x, 95, or NT are not required to run them. If the program • does not run properly in Windows, run it in the DOS Information on the various parameters is available mode. -
Page 23: Screen Menu
PROGRAMMING Delete - Deletes the current file. 2-Tone Code Channel - Displays the screen shown in Table 3-6 which programs transceiver operation with a Dos - Allows you to go to the DOS mode to perform a 2-tone option. The optional 2-Tone Decoder Kit, Part function in DOS such as copying a file. -
Page 24: Model Menu
PROGRAMMING 3.4.6 MODEL MENU unique parameters are displayed in the Screen menu and Memory Channel and DTMF Autodial screens. Refer to Section 3.5 for more information on PMR models. 3.4.7 SETUP MENU LMR - Selects LMR (U.S.A.) models. Selecting this model displays unique parameters in various screens for programming a 2-tone option. - Page 25 PROGRAMMING Table 3-1 Memory Channel Screen Description (LMR Models) (Continued) Parameter Description Ch Atr Press (Enter) to display the menu which selects one of the following choices: (Channel Attribute) Priority Channel - The channel is selected when the Priority key is pressed, and it is monitored during priority scan.
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Page 26: Key And Display Assign Screen Description
PROGRAMMING Table 3-1 Memory Channel Screen Description (LMR Models) (Continued) Parameter Description Scan Programs if the channel is scanned (scan list status). Press (Enter) to display the selection screen or select the desired condition by pressing the spacebar or backspace key. The scan list status of the currently selected chan- nel is changed by pressing the Scan function key for 2 seconds. - Page 27 PROGRAMMING Table 3-2 Key and Display Assign Screen Description (Continued) Parameter Description Bank Up Selects the other bank of sixteen channels if applicable. Moni Pressing and holding this key for 2 seconds latches the monitor mode on as indicated by .
- Page 28 PROGRAMMING Table 3-2 Key and Display Assign Screen Description (Continued) Parameter Description Emergency Pressing this key transmits an emergency call for as long as it is pressed. As with the preceding parameter, the Single emergency channel is specified in the channel screen (CH Atr column), and this function cannot be assigned to the A-D keys.
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Page 29: Dtmf Autodial Screen Description
PROGRAMMING Table 3-3 DTMF Autodial Screen Description Parameter Description This screen is used to program the DTMF autodial codes that can be transmitted by pressing the DTMF key (see Table 3- 2). Each location can contain up to 24 characters. Allowable characters are 0-9, A-D, *, and #. In addition, a text message can be programmed which is then displayed in place of the code. -
Page 30: Scan Function Screen Description
PROGRAMMING Table 3-5 Scan Function Screen Description Parameter Description Mode The following conditions are programmable: Scan Off - Scanning is disabled and cannot be enabled by a front panel switch. Mode 1 - Selects normal (non-priority) scanning from the lowest to highest channel. Mode 2 - Selects priority scanning from the lowest to highest channel while checking the priority channel. -
Page 31: Tone Code Channel Screen Description
PROGRAMMING Table 3-6 2-Tone Code Channel Screen Description Parameter Description Group Call Programs if the 1st or 2nd tone is used for the group code. Text Programs the text that is displayed when a matched 2-tone is received. The allowable characters are the same as in “Text”... -
Page 32: Common Screen Description
PROGRAMMING Table 3-7 Common Screen Description Parameter Description COMMON 1 PARAMETERS User Programs the password that must be entered at power on if the following “PWR ON Password” parameter is Password “On” or to cancel the “STUN” condition described in Table 3-6. Any four-digit number from 0000-9999 can be programmed. -
Page 33: Expert Screen Description
PROGRAMMING Table 3-7 Common Screen Description (Continued) Parameter Description CTCSS If CTCSS tone Call Guard signaling is programmed on the channel, this sets the length of the reverse burst that Reverse is transmitted when the PTT switch is released. The reverse burst prevents the “squelch tail” (noise burst) in the Burst transceiver receiving the signal. -
Page 34: Unique Pmr (European) Screens
PROGRAMMING Table 3-8 Expert Screen Description (Continued) Tx DTCS Selects the transmit digital Call Guard (DTCS) code polarity. For this type of signaling to work properly, the Inverse polarity of the code in the transmitting and receiving transceivers must be the same. The polarity can also be set for each channel (see Table 3-1). -
Page 35: Memory Channel Screen (Pmr Models)
PROGRAMMING Figure 3-2 Memory Channel Screen (PMR Models) Revised July 1999 3-15 Part No. 001-7500-002... -
Page 36: Cloning (Programming One Transceiver With Another)
PROGRAMMING 3.6 CLONING (PROGRAMMING ONE Rx Code Channel - This screen is shown below and it TRANSCEIVER WITH ANOTHER) programs the receive 5-tone code information. One transceiver can be used to program another with identical data. Replication Cable, Part No. 585- 7500-033, is required to connect the transceivers together (see Table 1-1). -
Page 37: Circuit Description
CIRCUIT DESCRIPTION SECTION 4 CIRCUIT DESCRIPTION NOTE: Block diagrams of the VHF and UHF trans- 4.1.3 FIRST MIXER AND FIRST IF CIRCUIT ceivers are located on pages 7-2 and 7-3. The first mixer converts the received signal to a 4.1 RECEIVER CIRCUIT fixed frequency that is the first IF signal. -
Page 38: Af Circuit
CIRCUIT DESCRIPTION Figure 4-1 Second IF and Demodulator Circuits 4.1.5 AF CIRCUIT detector section and converted to pulse-type signals (NOIS) by the noise comparator section. The NOIS AF signals from FM IF integrated circuit IC2, pin signal is applied to CPU IC8 on pin 19. 9, are applied to mute switch IC4, pin 1, via AF filter circuit IC3b, pins 6 and 7. -
Page 39: Drive/Power Amplifier Circuits
CIRCUIT DESCRIPTION Figure 4-2 APC Circuit 4.2.5 POWER DETECTOR (UHF ONLY) The audio signal changes the reactance of diode D6 (VHF) or D404 (UHF) to modulate the VCO sig- nal at Q7 and Q8. The VCO signal is amplified by Power detector D2 detects the transmit power buffer-amplifiers Q4 and Q6 and then applied to T/R output level and converts it to a DC voltage. -
Page 40: Pll Circuit
CIRCUIT DESCRIPTION Buffers Q5, Q26 Figure 4-3 PLL Circuit 4.3 PLL CIRCUIT Part of the VCO signal is amplified by buffer- amplifier Q4 and applied to the receive first mixer or A PLL circuit shown in Figure 4-3 provides a sta- transmit buffer-amplifier circuit via T/R switching ble transmit frequency and receive first LO fre- diodes D3 and D4. -
Page 41: Cpu Port Allocation
CIRCUIT DESCRIPTION 4.5 CPU PORT ALLOCATION Port Pin No Description Name Port Outputs T5 regulator control signal. Pin No Description Name Low = transmit mode CTCIN Input port for CTCSS/DTCS (Call LIGHT Outputs LCD backlight control signal. Guard) signals for decoding. High = Light on CSIFT Outputs reference oscillator for the CPU AFON Outputs the control signal for the AF... - Page 42 CIRCUIT DESCRIPTION This page intentionally left blank. December 1997 Part No. 001-7500-001...
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Page 43: Adjustment Procedure
ADJUSTMENT PROCEDURE SECTION 5 ADJUSTMENT PROCEDURE Audio Generator To Mic Jack AC Millivoltmeter Attenuator FM Deviation Meter 40 dB or 50 dB To Antenna RF Power Meter Jack 10W, 50 ohm Programming Cable Frequency Counter Standard Signal Generator -17 to -125 dBm (32 mV to 0.13 µV) Figure 5-1 Test Setup 5.1 GENERAL... -
Page 44: Test Channels And Power Select
ADJUSTMENT PROCEDURE Battery Voltage RxD (Prog Jk) Rx Sig Strength Tx Current Internal Temp PLL Lock Voltage Selected Channel Info IC10 D/A Outputs RF Power Output FM Deviation Receive Sensitivity Reference Frequency NOTE: The above values for settings are examples only. Each transceiver has its own specific values for each setting. -
Page 45: Reprogramming If Eeprom Is Replaced Or Error Occurs
ADJUSTMENT PROCEDURE 1. Copy the Adjust software to the hard disk or a pro- NOTE: If using serial port 2, type “2” instead of “1” gramming disk as described in Section 3.1.3 after .ICF. 2. Turn transceiver power on and connect the com- 5. -
Page 46: Pll Adjustment (Vhf Models)
ADJUSTMENT PROCEDURE VHF ADJUSTMENTS Mic Spkr Attach an RF Connector Here R92 (Squelch Adjust) R150 (DTCS Waveform Adjust) Figure 5-3 VHF Adjustment Points 5.3 PLL ADJUSTMENT (VHF MODELS) 3. Unkey the transmitter and the meter reading in the receive mode should be 2.2 – 3.2 volts (LB) or 1. -
Page 47: Output Power Adjust
ADJUSTMENT PROCEDURE VHF ADJUSTMENTS (CONT’D) 4. Press (Enter) again to select the second adjust chan- Wideband (25 kHz) Models - 4.2 kHz nel. Key the transmitter and adjust for the displayed Narrowband (12.5 kHz) Models - 2.1 kHz frequency (136.001360 or 146.001460 MHz). 5.4.4 DTCS WAVEFORM ADJUST Unkey the transmitter and press (Enter) again to exit this function. -
Page 48: Squelch Adjust
ADJUSTMENT PROCEDURE VHF ADJUSTMENTS (CONT’D) b. Press the F9 key and all filters are automatically adhesive-backed label covering the access hole in the adjusted for peak levels. chassis. Simply insert a sharp tool under the label and carefully peel it off. A spare label is included with Automatic Adjustment Method 2 each transceiver. -
Page 49: Pll Adjustment (Uhf Models)
ADJUSTMENT PROCEDURE UHF ADJUSTMENTS Mic Spkr Attach an RF Connector Here Squelch Adjust Figure 5-4 UHF PLL Adjustment Points 5.6 PLL ADJUSTMENT (UHF MODELS) 5. Verify that the voltage at CP1 is 3.0 – 4.5 volts in both the receive and transmit modes. 1. -
Page 50: Output Power Adjust
ADJUSTMENT PROCEDURE UHF ADJUSTMENTS (CONT’D) 5.7.3 FM DEVIATION ADJUST frequency (400.00400 or 440.004400 MHz). Release the PTT switch and press (Enter) again to exit this function. 1. Select the channel on the low end of the band (400.000 or 440.000 MHz). The “MOD” parameter NOTE: The transmit modulation adjustment in on the screen must be “80”... -
Page 51: Receiver Adjustments (Uhf Models)
ADJUSTMENT PROCEDURE UHF ADJUSTMENTS (CONT’D) Mic Spkr Attach an RF Connector Here Figure 5-5 UHF Adjustment Points 5.8 RECEiVER ADJUSTMENTS (UHF MODELS) Automatic Adjustment Method 1 (Adjusts all filters) 5.8.1 BANDPASS FILTER ADJUST a. Select “BPF T1” on the screen and adjust for “0”. 1. -
Page 52: Squelch Adjust
ADJUSTMENT PROCEDURE UHF ADJUSTMENTS (CONT’D) Manual Adjustment Adjustment Procedure →, a. Select “BPF T1” and press the adjust keys (←/ 1. Select the channel in the middle of the band PgUp/PgDn, or spacebar/backspace) for (415.000 or 455.000 MHz). minimum distortion. 2. -
Page 53: Parts List
PARTS LIST SECTION 6 PARTS LIST 7510 (VHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. C 33 Ceramic C1608 JB 1H 102K-T-A 022-3906-060 7510 (VHF) MAIN UNIT C 34 Ceramic C1608 CH 1H 0R5B-T-A 022-3906-084 C 35 Ceramic C1608 JB 1H 102K-T-A 022-3906-060 PARTS LIST... - Page 54 PARTS LIST 7510 (VHF) Main Unit 7510 (VHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. C 65 Ceramic C1608 CH 1H 040B-T-A 022-3906-609 C 105 Ceramic C1608 JB 1E 103K-T-A 022-3906-063 C 66 Ceramic C1608 CH 1H 180J-T-A 022-3906-068 C 106 Ceramic C1608 CH 1H 560J-T-A 022-3906-601 C 67...
- Page 55 PARTS LIST 7510 (VHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. C 143 Ceramic C1608 JB 1H 102K-T-A 022-3906-060 C 190 Ceramic C1608 JB 1H 102K-T-A 022-3906-060 C 144 Ceramic C1608 JB 1H 102K-T-A 022-3906-060 C 193 Ceramic C1608 CH 1H 080D-T-A 022-3906-597 C 145...
- Page 56 PARTS LIST 7510 (VHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. C 243 Ceramic C1608 JB 1H 102K-T-A 022-3906-060 Ceramic C1608 CH 1H 390J-T-A 022-3906-599 C 244 Ceramic C1608 JB 1E 103K-T-A 022-3906-063 (146-174 MHz) C 245 Ceramic C1608 JB 1E 103K-T-A 022-3906-063...
- Page 57 PARTS LIST 7510 (VHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. Ceramic CFWM450E (Wideband 022-3906-590 COIL ELJRE 82NG-F 022-3906-675 models) (146-174 MHz) Ceramic CFWM450G (Narrow- 022-3906-591 L 15 COIL LQN 1A 47NJ04 022-3906-650 band models) L 16 COIL LQN1H 54NK04 022-3906-676...
- Page 58 PARTS LIST 7510 (VHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. Q 17 Transistor UN911H(TX) 022-3906-576 R 19 Resistor 391 V (390ohm) 022-3906-149 Q 18 Transistor 2SB1132 T100 R 022-3906-318 R 20 Resistor 683 V (68kohm) 022-3906-173 Q 19 Transistor XP6501-(TX).AB...
- Page 59 PARTS LIST 7510 (VHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. R 72 Resistor 103 V (10kohm) 022-3906-163 R 117 Resistor 152 V (1.5kohm) 022-3906-155 R 75 Resistor 221 V (220ohm) 022-3906-288 R 120 Resistor 683 V (68kohm) 022-3906-173 R 77 Resistor 101 V (100ohm)
- Page 60 PARTS LIST 7510 (VHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. R 176 Resistor 392 V (3.9kohm) 022-3906-391 R 228 Resistor 104 V (100kohm) 022-3906-175 R 177 Resistor 102 V (1kohm) 022-3906-154 R 229 Resistor 683 V (68kohm) 022-3906-173 R 178 Resistor 392 V (3.9kohm)
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Page 61: 7540 (Uhf) Main Unit
PARTS LIST 7540 (UHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. 7540 (UHF) MAIN UNIT C 48 Tantalum ECST1EY105R 022-3906-632 C 51 Ceramic C1608 CH 1H 100D-T-A 022-3906-598 PARTS LIST C 52 Ceramic C1608 JB 1E 103K-T-A 022-3906-063 C 53 Ceramic C1608 CH 1H 050B-T-A 022-3906-610... - Page 62 PARTS LIST 7540 (UHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. Ceramic C1608 CH 1H 090D-T-A 022-3906-348 C 128 Ceramic C2012 JF 1C 105Z-T-A 022-3906-078 (400-430 MHz) C 129 Tantalum ECST0JY156R 022-3906-635 C 92 Ceramic C1608 CH 1H 070D-T-A 022-3906-596 C 131 Ceramic C1608 JB 1E 103K-T-A 022-3906-063...
- Page 63 PARTS LIST 7540 (UHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. C 170 Ceramic C1608 JB 1H 102K-T-A 022-3906-060 C 223 Ceramic C1608 JB 1E 103K-T-A 022-3906-063 C 171 Ceramic C1608 JB 1H 102K-T-A 022-3906-060 C 224 Ceramic C1608 JB 1E 103K-T-A 022-3906-063...
- Page 64 PARTS LIST 7540 (UHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. C 408 Ceramic C1608 JB 1H 471K-T-A 022-3906-059 C 446 Ceramic C1608 CH 1H 470J-T-A 022-3906-600 C 410 Ceramic C1608 CH 1H 070D-T-A 022-3906-596 C 447 Electrolytic ECEV0JV330SR 022-3906-616...
- Page 65 PARTS LIST 7540 (UHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. C 487 Ceramic C1608 CH 1H 470J-T-A 022-3906-600 Xtal UM-5 46.35MHz (FL-267) 022-3906-587 C 488 Ceramic C1608 JB 1H 222K-T-A 022-3906-061 (Narrowband models) C 489 Ceramic C1608 JB 1C 153K-T-A 022-3901-397 Xtal UM-5 46.35MHz (FL-271) 022-3906-589...
- Page 66 PARTS LIST 7540 (UHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. L 17 Coil LQN 1A 8N8J04 022-3906-109 Transistor 2SC5107-O (TE85R) 022-3906-566 L 18 Coil LQN 1A 8N8J04 022-3906-109 Transistor 2SC4226-T2 R25 022-3906-499 L 19 Coil LQN 1A 8N8J04 022-3906-109 Transistor 2SC4226-T2 R25...
- Page 67 PARTS LIST 7540 (UHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. R 13 Resistor 100 V (10ohm) 022-3906-138 R 85 Resistor 152 V (1.5Kohm) 022-3906-155 R 14 Resistor 101 V (100ohm) 022-3906-143 R 86 Resistor 104 V (100Kohm) 022-3906-175 R 15 Resistor 103 V (10Kohm)
- Page 68 PARTS LIST 7540 (UHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. R 117 Resistor 152 V (1.5Kohm) 022-3906-155 R 172 Resistor 105 V (1Mohm) 022-3906-184 R 118 Resistor 1R0 V (1ohm) 022-3906-688 R 174 Resistor 153 V (15Kohm) 022-3906-165 R 119 Trimmer EVM-1YSX50 B14 (103) 022-3906-697...
- Page 69 PARTS LIST 7540 (UHF) Main Unit Ref No. Description Part No. Ref No. Description Part No. R 234 Resistor 223 V (22Kohm) 022-3906-167 R 442 Resistor 103 V (10Kohm) 022-3906-163 R 235 Resistor 684 V (680Kohm) 022-3906-183 R 443 Resistor 103 V (10Kohm) 022-3906-163 R 236 Resistor 102 V (1Kohm)
- Page 70 PARTS LIST Ref No. Description Part No. Ref No. Description Part No. 7510 (VHF) CHASSIS PARTS 7540 (UHF) CHASSIS PARTS Chassis 1922 Chassis-1 022-3906-703 Chassis 1922 Chassis-1 022-3906-703 Panel 2079 T-front panel assy 022-3906-708 Panel 2079 S-Front Panel (A) Assy 022-3906-709 Panel 2079 S-front panel assy 022-3906-707 Panel 2079 T-Front Panel (A) Assy 022-3906-710...