E.F. Johnson Company 761X Service Manual

E.F. Johnson Company 761X Service Manual

Vhf-uhf conventional mobile fm two-way radio
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Service Manual
761x (VHF)
764x (UHF)
Conventional Mobile
VHF 146-174 MHz
45 Watts
Part No. 242-7610-0xx
UHF 400-430, 450-470, 470-490,
490-512 MHz
35 Watts
Part No. 242-7640-0xx
First Printing
November 1998

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Summary of Contents for E.F. Johnson Company 761X

  • Page 1 Service Manual 761x (VHF) 764x (UHF) Conventional Mobile VHF 146-174 MHz 45 Watts Part No. 242-7610-0xx UHF 400-430, 450-470, 470-490, 490-512 MHz 35 Watts Part No. 242-7640-0xx First Printing November 1998...
  • Page 2 Copyright© 1998 by Transcrypt International Incorporated Transcrypt offers communication solutions in two core areas: land mobile radio products and systems, and information security. EFJohnson land mobile radios and systems pro- vides wireless communication for a variety of markets including government, public safety, and commercial users.
  • Page 3: Table Of Contents

    Power Cable Fuses ..... . . 2-3 USING AN EXTERNAL SPEAKER ..2-3 ACCESSORY CABLE INSTALLATION ..2-3 TRANSCEIVER DISASSEMBLY .
  • Page 4 Beep Tone Level ......6-10 PARTS LIST VHF (761x) Models Main Unit .......7-1 Front Unit .
  • Page 5 SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS VHF (761x) Models Block Diagram ......8-1 Transistor and Diode Basing....8-2 Main Unit Board Bottom View.
  • Page 6: General Information

    SECTION 1 GENERAL INFORMATION 1.1 SCOPE OF MANUAL This service manual contains operation, installa- tion, programming, alignment, and service information for the EFJohnson® 7610 and 7640 mobile transceiv- ers. 1.2 TRANSCEIVER DESCRIPTION 1.2.1 GENERAL The 7600-series mobile transceivers operate on conventional (non-trunked) channels.
  • Page 7: Factory Returns

    NOTE: Emergency 24-hour technical support is also available at the 800 and preceding numbers during off hours, holidays, and weekends. When your call is answered at EFJohnson, you will hear a brief message informing you of numbers that can be entered to reach various departments. This number may be entered during or after the message using a tone-type telephone.
  • Page 8: Replacement Parts

    P.O. Box 1249 Waseca, MN 56093-0514 1.10 INTERNET HOME PAGE EFJohnson has a site on the World Wide Web that can be accessed for information on the company and such things as products, systems, and regulations. The address is http://www.efjohnson.com.
  • Page 9 GENERAL INFORMATION This page intentionally left blank. November 1998 Part No. 001-7600-001...
  • Page 10 7610 (VHF) AND 7640 (UHF) MOBILE 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. Frequency Range Operating Modes Channels...
  • Page 11 GENERAL INFORMATION NOTES November 1998 Part No. 001-7600-001...
  • Page 12: Installation And Disassembly

    Section 4. Transceivers normally contain UHF-Type Ant Jack 10-Ft. Power Cable Black (–) Optional External Speaker P .N. 250-0151-010 20A Fuses Figure 2-1 Installation Components factory test channels and other test parameters when they are shipped. The included labels should be attached to the option keys to indicate the function.
  • Page 13: Installing Mounting Bracket

    INSTALLATION AND DISASSEMBLY Figure 2-2 Mounting Bracket Installation WARNING • Do not mount the transceiver where it may inter- fere with the operation of vehicle controls. • Do not mount the transceiver where the user can- not easily reach the controls and view the display.
  • Page 14: Power Cable Fuses

    2.4 USING AN EXTERNAL SPEAKER An external speaker can be plugged into the external speaker jack on the back of the transceiver. This speaker should have an impedance of 4-8 ohms and a power handling capability of at least 3.5 watts.
  • Page 15: Transceiver Disassembly

    INSTALLATION AND DISASSEMBLY 2.6 TRANSCEIVER DISASSEMBLY Removing Bottom Cover and Front Panel 1. Remove the bottom cover by removing four screws (A) as shown in Figure 2-4. 2. Remove the front panel by removing two screws (B). Figure 2-4 Cover and Front Panel Removal Removing PC Board 3.
  • Page 16: Installation Procedure

    2.7 2-TONE/5-TONE MODULE INSTALLATION 2.7.1 INSTALLATION PROCEDURE 1. Turn power off and disconnect the power cable. 2. Remove the bottom cover by removing the four screws (A) shown in Figure 2-5. 3. Install the module as shown in Figure 2-7. The included foam pad is not used with this transceiver.
  • Page 17 INSTALLATION AND DISASSEMBLY 1. Monitor the transmit signal with a communications monitor. Set it for HPF = Off, LPF = 20 kHz, De- emphasis = Off, and Level = (P-P)/2. 2. Select a channel near the center of the band and turn a long tone on (see preceding “NOTE”) by pressing the appropriate front panel key.
  • Page 18: Front Panel

    Volume Volume Transmit Down Indicator Scan List Microphone Indicator Connector * The Channel Up/Down switches can also be programmed for other functions. 3.1 FEATURES • Up to 32 channels programmable • Multi-tone (CTCSS) and/or Multi-code (CDCSS) Call Guard® squelch programmable •...
  • Page 19: Controls And Display

    8 VDC. ) - Adjust the vol- 3.2.3 BACK PANEL External Speaker Jack - Miniature phone jack for connecting an optional 4-8 ohm external speaker. The internal speaker is automatically disabled when a speaker is plugged into this jack.
  • Page 20: Entering A Password

    2. Press the F4 option key to select the squelch adjust mode indicated by “SQ xx”. 3. Press the down the speaker (adjust the volume if necessary). Then press the up “SQ xx” number indicates the relative squelch level).
  • Page 21: Bank Select

    OPERATION 3.3.7 BANK SELECT Two banks of up to 16 channels each can be pro- grammed. Only the channels in the current bank are then selectable. This would allow, for example, groups of channels to be programmed for operation in differ- ent cities.
  • Page 22: Programmable Functions

    • Note if the busy indicator ( is being displayed. If it is not, the channel is not busy and a message can be transmitted. • Taking the microphone off-hook disables coded squelch control if it is programmed for the monitor function.
  • Page 23: Call Guard Tone Select

    OPERATION 3.5.5 CALL GUARD TONE SELECT If the transceiver has a TONE Guard (CTCSS) tone can be selected. This allows calls to be placed to different mobiles or groups of mobiles and received on different groups than is normal for the channel.
  • Page 24: Scan List Programming

    3.5.15 SCAN LIST PROGRAMMING Pressing the key changes the scan list sta- tus of the current channel. Refer to the scan list description in Section 3.6.2 for more information. 3.5.16 TALK-AROUND SELECT The talk-around mode causes transmissions to occur on the receive frequency to permit direct mobile-to-mobile communication when a repeater is being used.
  • Page 25: Priority Channel Sampling

    OPERATION The scan lists are user programmable if the key is available. Pressing this key changes the status of the displayed channel in the current scan list only. The display indicates “SC ON” if the channel was just added to the scan list and “SC OF” if it was just deleted.
  • Page 26: Programming

    Programming Cable (Includes Level Convert. Circuit) P .N. 585-7500-031 4.1 GENERAL 4.1.1 PROGRAMMING SETUP The following items are required to program this transceiver. The part numbers of the programming cable and software are shown in Table 1-1. A printer is also recommended for making a hard copy record of the information programmed into the transceiver.
  • Page 27: Starting The Program

    PROGRAMMING on the disk called ADJ. The use of this program is described in Section 5. 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 mode.
  • Page 28: Screen Menu

    4.4.3 SCREEN MENU LMR (U.S.) Format NOTE: The Screen menu for PMR (European) models is slightly different than the LMR version shown above. Refer to Section 4.5 for more information on PMR models. Memory Channel - Displays the screen shown in Table 4-1 which is used to program channel parame- ters such as frequency, Call Guard (CTCSS/DCTS) coding, and power output.
  • Page 29: Setup Menu

    PROGRAMMING in the Screen menu (see Section 4.4.3), Memory Channel screen (see Table 4-1), and DTMF Autodial screen (see Table 4-3). PMR - Selects PMR (European) models. Selecting this model displays unique parameters for program- ming a 5-tone option. As with the LMR selection, unique parameters are displayed in the Screen menu and Memory Channel and DTMF Autodial screens.
  • Page 30 Table 4-1 Memory Channel Screen Description (LMR Models) (Continued) Parameter Ch Atr Press (Enter) to display the menu which selects one of the following choices: (Channel Attribute) A: Priority A - The channel is selected when the Prio A key is pressed, and it is monitored during priority scan. In addition, the microphone hanger can be programmed so that this channel is automatically selected when- ever an off-hook condition occurs (see Table 4-2).
  • Page 31 PROGRAMMING Table 4-1 Memory Channel Screen Description (LMR Models) (Continued) Parameter RF PWR Programs the RF power output for the channel (High, Low1, Low2). This setting can be temporarily or perma- nently overridden by the HIGH, LOW1, or LOW2 power option switch if it is programmed (see Table 4-2). Lockout Transmit Disable On Busy.
  • Page 32: Key And Display Assign Screen Description

    Table 4-2 Key and Display Assign Screen Description and F1-F4 option keys can be programmed for the following functions. Press the (Enter) key and then PgUp/PgDn to display and then select the desired function. Parameter Label Null No function (key disabled). CH Up CH UP Scroll up or down through the programmed channels.
  • Page 33 PROGRAMMING Table 4-2 Key and Display Assign Screen Description (Continued) Parameter Label RF ATT Toggles the receive attenuate function on and off (see Section 3.5.13). Lock LOCK Locks/unlocks all programmable keys except CALL, MONI, and EMER to prevent them from being accidentally pressed (see Section 3.5.9).
  • Page 34: Dtmf Autodial Screen Description

    Table 4-2 Key and Display Assign Screen Description (Continued) Parameter Light Enables or disables the display and key backlight. This programming can be overridden by the power-on menu (see Section 3.3.4) or LITE key (see Section 3.3.9). The “Auto” configuration allows it to be controlled by pin 1 of the DB9 connector on the optional accessory cable.
  • Page 35: Continuous Tone Screen Description

    PROGRAMMING Table 4-4 Continuous Tone Screen Description The continuous tones programmed in this screen are selected by pressing the C.Tone CH Ent function key (see Table 4-2) and then pressing the up/down and received on the current channel. To transmit or receive using the codes programmed for the channel in the channel screen (see Table 4-1), select “TON--M”...
  • Page 36: Tone Code Channel Screen Description

    Table 4-5 Scan Function Screen Description (Continued) Parameter Stop Timer When Mode 2 or 3 above is programmed (priority scanning), this sets how often in seconds the priority channel is checked while receiving a message on some other channel. Resume This sets the scan resume delay in seconds.
  • Page 37 PROGRAMMING Table 4-6 2-Tone Code Channel Screen Description (Continued) Parameter Beep Emits (or turns off) the following beeps when receiving a matched 2-tone: Null - Beep emission (or non-emission) is retained even when receiving a matched 2-tone. Off - Repeater beep emission is turned off. Pi (Single) - One high beep once.
  • Page 38: Common Screen Description

    Table 4-7 Common Screen Description Parameter 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 4-6. Any four-digit number from 0000-9999 can be programmed.
  • Page 39: Expert Screen Description

    PROGRAMMING Table 4-7 Common Screen Description (Continued) Parameter Power On This turns the password function on and off. When it is turned on, “PWoRd” is displayed when power is turned Password on and a four-digit password must be entered to enable the transceiver (see Section 3.3.2). The password is pro- grammed in “User Password”...
  • Page 40: Unique Pmr (European) Screens

    Table 4-8 Expert Screen Description (Continued) Parameter Emer Sw Sets the period in seconds that the Emergency function key must be pressed to activate the emergency function. On Timer An emergency call is initiated by pressing the Emergency key for longer than this time. Emer Sw Sets the period in seconds that the Emergency function switch must be pressed to cancel an emergency call.
  • Page 41: Cloning

    PROGRAMMING The following screens selected in the preceding Screen menu are unique to PMR models. Refer to on- line help for information on parameters in these screens. Rx Code Channel - This screen is shown below and it programs the receive 5-tone code information. Tx Code Channel - This screen is shown below and it programs the transmit 5-tone code information.
  • Page 42: Memory Channel Screen (Pmr Models)

    4. Connect the master transceiver to the slave (target) transceiver by plugging the cloning cable into the microphone jack of each. 5. Turn the slave transceiver on. Then momentarily press the POWER switch of the master transceiver to begin the data transfer. Figure 4-2 Memory Channel Screen (PMR Models) 6.
  • Page 43 PROGRAMMING This page intentionally left blank. November 1998 Part No. 001-7600-001 4-18...
  • Page 44: Vhf (7610) Circuit Description

    SECTION 5A VHF (7610) CIRCUIT DESCRIPTION NOTE: A VHF transceiver block diagram is located on page 8-1. 5.1 VHF RECEIVER CIRCUIT 5.1.1 ANTENNA SWITCHING CIRCUIT The antenna switching circuit functions as a low- pass filter while receiving and a resonator circuit while transmitting.
  • Page 45: Audio Amplifier Circuit

    5.1.5 AUDIO AMPLIFIER CIRCUIT The AF (audio frequency) amplifier circuit pro- vides drive to the speaker (a block diagram is shown in Figure 5-2). The audio signal from IC3, pin 9 is applied to AF amplifier IC7A and then fed to pin 1 of AF switching circuit IC4.
  • Page 46: Vhf Transmitter Circuit

    Part of the AF signal from pin 9 of FM IF circuit IC3 is applied to pin 24 of level controller IC5. This device allows the CPU to control the squelch threshold level. The level-controlled output signal on pin 23 is applied to IC3, pin 8 which is the input of an internal filter (see Figure 5-1).
  • Page 47: Apc Circuit

    VHF (7610) CIRCUIT DESCRIPTION 5.2.5 APC CIRCUIT The APC (Automatic Power Control) circuit pro- tects the power amplifier from damage caused by a mismatched antenna load, and provides a stable power output. Detector D2 detects forward signals, and D1 detects reverse signals. The combined voltage is at minimum level when a matched antenna load of 50 ohms is present and then increases as it becomes mis- matched.
  • Page 48: Vhf Ic Pin Descriptions

    The phase detector determines the phase differ- ence between these signals and then produces output pulses on pin 8 which are filtered by the loop filter. This filter consists of R43-R45, C60, and C61. The output of this filter is the DC control voltage applied to the VCO.
  • Page 49: Vhf I/O Expander Ic5 (Main Unit)

    VHF (7610) CIRCUIT DESCRIPTION Port Description Name Outputs control signal for beep mute cir- cuit Q10. High = Beep muted. CTDA0- Output port for CTCSS/DTCS signals. CTDA2 HANG Input port for the microphone hanger detection signal. Low = Microphone on hook.
  • Page 50: Uhf (7640) Circuit Description

    SECTION 5B UHF (7640) CIRCUIT DESCRIPTION NOTE: The UHF transceiver block diagram is located on page 8-6. 5.5 UHF RECEIVER CIRCUIT 5.5.1 ANTENNA SWITCHING CIRCUIT The antenna switching circuit functions as a low- pass filter while receiving and a resonator circuit while transmitting.
  • Page 51: Audio Amplifier Circuit

    5.5.5 AUDIO AMPLIFIER CIRCUIT The AF (audio frequency) amplifier circuit pro- vides drive to the speaker (see block diagram in Figure 5-5). The audio signal from IC1, pin 9 is applied to AF amplifier IC7b and then fed to high-pass filter IC6c/ IC6d.
  • Page 52: Uhf Transmitter Circuit

    Part of the AF signal from pin 9 of FM IF circuit IC1 is applied to pin 24 of level controller IC12. This device allows the CPU to control the squelch threshold level. The level-controlled output signal on pin 23 is applied to IC1, pin 8 which is the input of an internal filter (see Figure 5-4).
  • Page 53: Apc Circuit

    UHF (7640) CIRCUIT DESCRIPTION 5.6.5 APC CIRCUIT The APC (Automatic Power Control) circuit pro- tects the power amplifier from damage caused by a mismatched antenna load, and provides a stable power output. One diode in D1 detects forward signals and the other detects reverse signals.
  • Page 54: Uhf Power Supply

    The phase detector determines the phase differ- ence between these signals and then produces output pulses on pin 8 which are filtered by the loop filter. This filter consists of Q34, R180, R181, and C202- C204. The output of this filter is the DC control volt- age applied to the VCO.
  • Page 55: Uhf I/O Expander Ic12 (Main Unit)

    UHF (7640) CIRCUIT DESCRIPTION Port Description Name Outputs control signal for beep mute cir- cuit Q10. High = Beep muted. CTDA0- Output port for CTCSS/DTCS signals. CTDA2 HANG Input port for the microphone hanger detection signal. Low = Microphone on hook.
  • Page 56: Adjustment Procedure

    External Speaker ±1 ppm or better 100 mV or better ADJUSTMENT PROCEDURE Frequency Monitor 13.6 Volt, 17A Power Supply 4.0 Ohm Speaker Load Grade and Range Freq range DC-520 MHz Measuring range 0 to ±10 kHz Freq range 67-3000 Hz...
  • Page 57: Test Channels

    ADJUSTMENT PROCEDURE Supply Voltage Internal Temp PLL Lock Voltage RSSI DTCS Bal Level Squelch Level Selected Channel Info RF Power Output FM Deviation DTCS Balance Reference Frequency NOTE: The above values for the various settings are examples only. Because of component tolerances, the optimum setting for each transceiver will probably be different.
  • Page 58: Computer-Aided Tuning

    Test Channel 7 [1] 8 [1] [1] If the transceiver operates on only narrow or wide band channels, program only chan- nels 1-6, and program them for the type of channels used (narrow or wide band). If the transceiver operates on both wide and narrow band channels, program additional channels 7 and 8 for the other type of operation.
  • Page 59: Reprogramming If Eeprom Is Replaced Or Error Occurs

    ADJUSTMENT PROCEDURE in the upper part of the screen is for the currently selected channel. 5. To move the cursor between the parameters on the left side of the bar graph, press the To change a parameter, press the backspace, or spacebar keys. Refer to the individual adjustment descriptions for more information on the functions performed using this screen.
  • Page 60: Output Power Adjust

    4. Press (Enter) again to select the second adjust chan- nel. Key the transmitter and adjust for the displayed frequency. Unkey the transmitter and press (Enter) again to exit this function. 6.4.2 OUTPUT POWER ADJUST 1. Select the high power channel in the middle of the band (Test Ch.
  • Page 61: Dtcs Waveform Adjust

    Repeat for the other three filters. a. Connect a SINAD meter with a 4-ohm load to the external speaker jack (see Figure 6-4). b. Select “BPF T1” and press the adjust keys ( / PgUp/PgDn, or spacebar/backspace) to obtain minimum distortion.
  • Page 62: Beep Tone Level

    3. Connect an RF signal generator to the antenna jack. Set it to the channel frequency with an output mod- ulated with 1 kHz at the following deviation: Wideband (30 kHz) Models - 3.5 kHz Narrowband (12.5 kHz) Models - 1.75 kHz 4.
  • Page 63: Pll Adjustment (Uhf Models)

    ADJUSTMENT PROCEDURE NOTE: Perform the preliminary setup described in Section 6.2 before proceeding with these adjustments. 6.6 PLL ADJUSTMENT (UHF MODELS) 1. Remove the bottom cover by removing four screws. Connect a DC voltmeter to check point CP1 shown in Figure 6-6. 2.
  • Page 64: Dtcs Waveform Adjust

    6.7.4 DTCS WAVEFORM ADJUST 1. Select the channel on the low end of the pro- grammed for DTCS code 007N (Test Ch. 5). 2. On the computer screen, scroll to “DTCS N” if set- ting a narrow band channel or “DTCS W” if setting a wideband channel.
  • Page 65: Receiver Adjustments

    Repeat for the other three filters. Manual Adjustment a. Connect a SINAD meter with a 4-ohm load to the external speaker jack (see Figure 6-6). b. Select “BPF T1” and press the adjust keys ( / PgUp/PgDn, or spacebar/backspace) to obtain minimum distortion.
  • Page 66: Main Unit

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  • Page 72 5HIý1Rï 'HVFULSWLRQ 5ìèé 5HVý(5-ê*(<-ýìíéý9ýõìííýNýRKPô íëëðêäíçðìæè 5ìèè 5HVý(5-ê*(<-ýìíêý9ýõìíýNýRKPô íëëðêäíçðìçê 5ìèç 5HVý(5-ê*(<-ýçåéý9ýõçåíýNýRKPô íëëðêäíçðìåê 5ìèæ 5HVý(5-ê*(<-ýìëêý9ýõìëýNýRKPô íëëðêäíçðìçé 5ìèå 5HVý(5-ê*(<-ýçåéý9ýõçåíýNýRKPô íëëðêäíçðìåê 5ìèä 5HVý(5-ê*(<-ýìíêý9ýõìíýNýRKPô íëëðêäíçðìçê 5ìçí 5HVý(5-ê*(<-ýìèêý9ýõìèýNýRKPô íëëðêäíçðìçè 5ìçì 5HVý(5-ê*(<-ýéæéý9ýõéæíýNýRKPô íëëðêäíçðìåì 5ìçë 5HVý(5-ê*(<-ýçåêý9ýõçåýNýRKPô íëëðêäíçðìæê 5ìçê 5HVý(5-ê*(<-ýìíèý9ýõìý0ýRKPô íëëðêäíçðìåé 5ìçé 5HVý(5-ê*(<-ýéæëý9ýõéïæýNýRKPô íëëðêäíçðìçí 5ìçè 5HVý(5-ê*(<-ýéæêý9ýõéæýNýRKPô íëëðêäíçðìæì 5ìçç 5HVý(5-ê*(<-ýìëéý9ýõìëíýNýRKPô íëëðêäíçðìæç 5ìçæ...
  • Page 73: Main Unit

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  • Page 74 5HIý1Rï 'HVFULSWLRQ &íêì &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &íêë &HUDPLFý&ìçíåý&+ýì+ýë5è%ð7ð$ý õéííðéêíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýì5è%ð7ð$ý õéèíðéæíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýíëí%ð7ð$ý õéæíðéäíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýíìí%ð7ð$ý õéäíðèìëý0+]ô &íêê &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &íêé &HUDPLFý&ìçíåý&+ýì+ýíæí'ð7ð$ý õéííðéêíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýíçí%ð7ð$ý õéèíðéæíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýíéí%ð7ð$ý õéæíðèìëý0+]ô &íêè &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &íêç &HUDPLFý&ìçíåý&+ýì+ýí5è%ð7ð$ íëëðêäíçðíåé &íêæ &HUDPLFý&ìçíåý&+ýì+ýíìí%ð7ð$ý õéííðéêíý0+]ýRQO\ô &HUDPLFý&ìçíåý&+ýì+ýí5ê%ð7ð$ý õRWKHUýEDQGVô &íêå &HUDPLFý&ìçíåý&+ýì+ýë5è%ð7ð$ý õéííðéêíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýì5è%ð7ð$ý õéèíðéäíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýí5è%ð7ð$ý...
  • Page 75 PARTS LIST 5HIý1Rï 'HVFULSWLRQ &íäé &HUDPLFý+0çí6-ý&+ýíêí'ýèíí9ý õéííðéêíý0+]ô &HUDPLFý+0çí6-ý&+ýíçí'ýèíí9ý õéèíðéæíý0+]ô &HUDPLFý+0çí6-ý&+ýíéí&ýèíí9ý õéæíðéäíý0+]ô &HUDPLFý+0çí6-ý&.ýíëí&ýèíí9ý õéäíðèìëý0+]ô &íäè (OHFWURO\WLFý(&(9ì($ëëí63 &íäç &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &íäæ &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &íäå &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &íää &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &ìíí (OHFWURO\WLFý(&(9ì($ëëí63 &ìíì &HUDPLFý&ìçíåý&+ýì+ýíèí%ð7ð$ íëëðêäíçðçìí &ìíë &HUDPLFý&ìçíåý&+ýì+ýíåí'ð7ð$ý õéäíðèìëý0+]ô &HUDPLFý&ìçíåý&+ýì+ýíåí'ð7ð$ý õRWKHUýEDQGVô &ìíê &HUDPLFý&ìçíåý&+ýì+ýíçí%ð7ð$ íëëðêäíçðçìè &ìíé...
  • Page 76 5HIý1Rï 'HVFULSWLRQ &ìèí &HUDPLFý&ìçíåý8-ýì+ýìíí'ð7ð$ý õéííðéêíý0+]ô &HUDPLFý&ìçíåý8-ýì+ýíåí'ð7ð$ý õéèíðéæíý0+]ô &HUDPLFý&ìçíåý8-ýì+ýìèí-ð7ð$ý õéæíðéäíý0+]ô &HUDPLFý&ìçíåý8-ýì+ýíéí&ð7ð$ý õéäíðèìëý0+]ô &ìèì &HUDPLFý&ìçíåý&+ýì+ýíèí%ð7ð$ý õéííðéêíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýíëí%ð7ð$ý õéèíðéæíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýíåí'ð7ð$ý õéæíðéäíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýíêí%ð7ð$ý õéäíðèìëý0+]ô &ìèë &HUDPLFý&ìçíåý&+ýì+ýíåí'ð7ð$ý õéííðéêíñýéæíðéäíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýíéí%ð7ð$ý õéèíðéæíý0+]ô &HUDPLFý&ìçíåý&+ýì+ýíêí%ð7ð$ý õéäíðèìëý0+]ô &ìèê &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &ìèé &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &ìèè &HUDPLFý&ìçíåý&+ýì+ýí5è%ð7ð$ íëëðêäíçðíåé &ìèç &HUDPLFý&ìçíåý-%ýì+ýéæì.ð7ð$ íëëðêäíçðíèä &ìèæ &HUDPLFý&ìçíåý-%ýì+ýéæì.ð7ð$ íëëðêäíçðíèä...
  • Page 77 PARTS LIST 5HIý1Rï 'HVFULSWLRQ &ëëä &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &ëêí &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &ëêì &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &ëêë &HUDPLFý&ìçíåý-%ýì(ýìíê.ð7ð$ íëëðêäíçðíçê &ëêê &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &ëêé &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &ëêè &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &ëêç &HUDPLFý&ìçíåý-%ýì&ýìíé.7ð1 &ëêæ &HUDPLFý&êëìçý-%ýì&ýìíè0ð7ð$ íëëðêäíçðäìæ &ëêå (OHFWURO\WLFý(&(9ì&$ìíí65 &ëêä &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &ëéí &HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ íëëðêäíçðíçí &ëéì &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &ëéë...
  • Page 78 5HIý1Rï 'HVFULSWLRQ &êëç &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &êëæ &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &êëå &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &êëä &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &êêí &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &êêì &HUDPLFý&ìçíåý-%ýì+ýéæì.ð7ð$ íëëðêäíçðíèä &êêë &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &êêê &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &êêé &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &êêè &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &êêç &HUDPLFý&ìçíåý&+ýì+ýéæí-ð7ð$ íëëðêäíçðçíí &êêæ 7DQWDOXPý7(069%ëýì9ýëëè0ðå/ íëëðêäíçðåìë &êêå &HUDPLFý&ìçíåý&+ýì+ýíæí'ð7ð$ý õH[FHSWýéäíðèìëý0+]ô...
  • Page 79 PARTS LIST 5HIý1Rï 'HVFULSWLRQ /íë &RLOý/$ðêåëýõéäíðèìëý0+]ýRQO\ô íëëðêäíçðäèë &RLOý/$ðëêëýõRWKHUýEDQGVô /íê &RLOý/$ðêåë /íé &RLOýêê&6ð<çèè/<ðíë0 3êýõéäíð èìëý0+]ýRQO\ô &RLOýêê&6ð<çèè/<ðíê. 3êý õRWKHUýEDQGVô /íè &RLOýêê&6ð<çèè/<ðíê. 3ê /íç &RLOý/:ðëè /íæ &RLOý/41ýì$ýìè1-íé /íå &RLOý/41ýì$ýìè1-íé /íä &RLOý(/-)&ýé5æ0ð) /ìí &RLOý/41ýì$ýìè1-íé /ìì &RLOý/41ýì$ýìè1-íé /ìë &RLOý(/-5(ýêä1*ð) /ìê &RLOý(/-1&ý5ìë.ð) /ìé &RLOý(/-1&ýèç1.ð) /ìè &RLOý(/-1&ý5ìå.ð) /ìç...
  • Page 80 5HIý1Rï 'HVFULSWLRQ 4êæ 7UDQVLVWRUý'7&ìéé(8ý7ìíæ 4êå 7UDQVLVWRUý'7&ìéé(8ý7ìíæ 4êä 7UDQVLVWRUý'7&ìéé(8ý7ìíæ 4éí )(7ýë6-ìééð*5ýõ7(åè5ô 4éì 7UDQVLVWRUý'7&êçê(.ý7ìéæ 4éë 7UDQVLVWRUý'7&ìéé(8ý7ìíæ 4éé 7UDQVLVWRUý'7&ìéé(8ý7ìíæ 4éè 7UDQVLVWRUý'7$ìéé(8ý7ìíæ 4éç 7UDQVLVWRUý'7$ìéé(8ý7ìíæ 5ííì 5HVý0&5ìí(=+-ýìííýNýRKPýõìíéô íëëðêäíçðäåê 5ííë 5HVý(5-ê*(<-ýì5íý9ýõìýýRKPô 5ííê 5HVý(5-ê*(<-ýìíìý9ýõìííýýRKPô íëëðêäíçðìéê 5ííé 5HVý0&5ìí(=+-ýéæýýRKPýõéæíô 5ííè 5HVý(5-ê*(<-ýìíìý9ýõìííýýRKPô íëëðêäíçðìéê 5ííç 5HVý(5-ê*(<-ýìíìý9ýõìííýýRKPô íëëðêäíçðìéê 5ííæ 5HVý0&5ìí(=+-ýéæýýRKPýõéæíô 5ííå 5HVý0&5èí-=+-ýëëíýýRKPýõëëìô íëëðêäíçðääè 5ííä...
  • Page 81 PARTS LIST 5HIý1Rï 'HVFULSWLRQ 5íæé 5HVý(5-ê*(<-ýëëìý9ýõëëíýýRKPô íëëðêäíçðëåå 5íæè 5HVý(5-ê*(<-ýìíìý9ýõìííýýRKPô íëëðêäíçðìéê 5íæç 5HVý(5-ê*(<-ýëëíý9ýõëëýýRKPô 5íææ 5HVý(5-ê*(<-ýêêëý9ýõêïêýNýRKPô íëëðêäíçðìèä 5íæå 5HVý(5-ê*(<-ýìèëý9ýõìïèýNýRKPô íëëðêäíçðìèè 5íæä 5HVý(5-ê*(<-ýëëíý9ýõëëýýRKPô 5íåí 5HVý(5-ê*(<-ýëëìý9ýõëëíýýRKPô íëëðêäíçðëåå 5íåì 5HVý(5-ê*(<-ýéæëý9ýõéïæýNýRKPô íëëðêäíçðìçí 5íåë 5HVý(5-ê*(<-ýëæëý9ýõëïæýNýRKPô íëëðêäíçðìèå 5íåê 5HVý(5-ê*(<-ýéæëý9ýõéïæýNýRKPô íëëðêäíçðìçí 5íåé 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô 5íåè 5HVý(5-ê*(<-ýìíêý9ýõìíýNýRKPô íëëðêäíçðìçê 5íåç 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô 5íåæ 5HVý(5-ê*(<-ýìíêý9ýõìíýNýRKPô...
  • Page 82 5HIý1Rï 'HVFULSWLRQ 5ìçå 5HVý(5-ê*(<-ýìíéý9ýõìííýNýRKPô íëëðêäíçðìæè 5ìçä 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô 5ìæí 5HVý(5-ê*(<-ýçåëý9ýõçïåýNýRKPô íëëðêäíçðìçë 5ìæë 5HVý(5-ê*(<-ýìíêý9ýõìíýNýRKPô íëëðêäíçðìçê 5ìæê 5HVý(5-ê*(<-ýìíêý9ýõìíýNýRKPô íëëðêäíçðìçê 5ìæé 5HVý(5-ê*(<-ýéæìý9ýõéæíýýRKPô íëëðêäíçðìèí 5ìæè 5HVý(5-ê*(<-ýìíêý9ýõìíýNýRKPô íëëðêäíçðìçê 5ìæç 5HVý(5-ê*(<-ýìíèý9ýõìý0ýRKPô íëëðêäíçðìåé 5ìææ 5HVý(5-ê*(<-ýçåêý9ýõçåýNýRKPô íëëðêäíçðìæê 5ìæå 5HVý(5-ê*(<-ýìíéý9ýõìííýNýRKPô íëëðêäíçðìæè 5ìæä 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô 5ìåí 5HVý(5-ê*(<-ýìíêý9ýõìíýNýRKPô íëëðêäíçðìçê 5ìåì 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô 5ìåë 5HVý(5-ê*(<-ýìííý9ýõìíýýRKPô 5ìåé...
  • Page 83: Front Unit

    PARTS LIST 7640 (UHF) Main Unit 5HIý1Rï 'HVFULSWLRQ 5ëæì 5HVý(5-ê*(<-ýìíêý9ýõìíýNýRKPô íëëðêäíçðìçê 5ëæë 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô 5ëæê 5HVý(5-ê*(<-ýåëéý9ýõåëíýNýRKPô íëëðêäíçðäåç 5ëæé 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô 5ëæè 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô 5ëæç 5HVý(5-ê*(<-ýìííý9ýõìíýýRKPô 5ëææ 5HVý(5-ê*(<-ýéæìý9ýõéæíýýRKPô íëëðêäíçðìèí 5ëæå 5HVý(5-ê*(<-ýìíêý9ýõìíýNýRKPô íëëðêäíçðìçê 5ëæä 5HVý(5-ê*(<-ýåëêý9ýõåëýNýRKPô íëëðêäíçðìæé :íë -XPSHUý(5'6ë7í :íç &DEOHý23&ðéèê :íæ -XPSHUý(5-ê*(ý-3:ý9 :íå -XPSHUý(5-ê*(ý-3:ý9 :íä -XPSHUý(5-ê*(ý-3:ý9 :ìí...
  • Page 84 5HIý1Rï 'HVFULSWLRQ &çè &HUDPý&ìçíåý&+ýì+ýéæí-ð7ð$ &çç &HUDPý&ìçíåý&+ýì+ýéæí-ð7ð$ &çæ &HUDPý&ìçíåý-%ýì+ýìíë.ð7ð$ &çä &HUDPý&ìçíåý-%ýì+ýìíë.ð7ð$ &æí &HUDPý&ìçíåý&+ýì+ýéæí-ð7ð$ &æì &HUDPý&ìçíåý&+ýì+ýéæí-ð7ð$ &æê &HUDPý&ìçíåý&+ýì+ýéæí-ð7ð$ &æé &HUDPý&ìçíåý&+ýì+ýéæí-ð7ð$ &ææ &HUDPý&ìçíåý&+ýì+ýéæí-ð7ð$ &æå &HUDPý&ìçíåý&+ýì+ýéæí-ð7ð$ &æä &HUDPý&ìçíåý&+ýì+ýéæí-ð7ð$ &åí &HUDPý&ìçíåý&+ýì+ýéæí-ð7ð$ &åë &HUDPý&ìçíåý-%ýì&ýìíé.7ð1 'ì 'LRGHý0$ìììýõ7;ô 'ë 'LRGHý'$ëíé8ý7ìíæ 'ê 'LRGHý'$ëíé8ý7ìíæ 'é 'LRGHý'$ëíé8ý7ìíæ 'è 'LRGHý0$ææýõ7:ô 'ç =HQHUý0$åíèìð0ýõ7;ô '6íì...
  • Page 85: Chassis Parts

    PARTS LIST Front Unit (All Models) 5HIý1Rï 'HVFULSWLRQ 5éì 5HVý(5-ê*(<-ýëæéý9ýõëæíýNýRKPô íëëðêäíçðìæä 5éë 5HVý(5-ê*(<-ýêêéý9ýõêêíýNýRKPô íëëðêäíçðìåí 5éê 5HVý(5-ê*(<-ýìëêý9ýõìëýNýRKPô íëëðêäíçðìçé 5éé $UUD\ý(;%ð9å9ýìíë-9 5éè $UUD\ý(;%ð9å9ýìíë-9 5éç $UUD\ý(;%ð9å9ýìíë-9 5éæ $UUD\ý(;%ð9å9ýìíë-9 5éå $UUD\ý(;%ð9å9ýìíë-9 5éä 5HVý(5-ê*(<-ýìíìý9ýõìííýýRKPô íëëðêäíçðìéê 5èí 5HVý(5-ê*(<-ýìíéý9ýõìííýNýRKPô íëëðêäíçðìæè 5èì 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô 5èë 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô 5èê 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô 5èé 5HVý(5-ê*(<-ýìíëý9ýõìýNýRKPô...
  • Page 86 MP7 (C) J1 (C) MP1 (C) MAIN UNIT (Bottom side) MP5 (C) MP6 (C) MP3 (M) MP7 (C) J5 (M) W3 (F) MP7 (C) J1 (F) W7 (M) MP7 (C) MP12 (M) MP1 (F) FRONT UNIT MP4 (M) MP11 (C) EP2 (F) MP6 (C) MP9 (C)
  • Page 87: Exploded View

    UHF (7640) EXPLODED VIEW November 1998 FOLDOUT 7-22 (VHF Exploded View) Part No. 001-7600-001...
  • Page 88 SECTION 8 - SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS DTCS IC7a IC7d CPU5 RESET CPU5 IC2.Q1 COM1-COM3 SEG1-SEG32 BACK LIGHT CTRL DS2-DS11 Q3.D6 AF CH U/D.Etc KEY X8 KR0-KR3 SW2-SW9 KS0.KS1 POSW POSW CLONE CLONE HANGER COMMON LINE LINE RX LINE TX LINE DATA BUS LINE RIPPLE...
  • Page 89 VHF (7610) Transistor Basing Diagrams VHF (7610) Diode Basing Diagrams November 1998 Part No. 001-7600-001...
  • Page 90 November 1998 VHF (7610) MAIN BOARD BOTTOM VIEW FOLDOUT Part No. 001-7600-001...
  • Page 91 November 1998 VHF (7610) MAIN BOARD TOP VIEW Part No. 001-7600-001...
  • Page 92: Main Unit

    3.9k C156 15k(LMR,L-band only) 4.7k(Others) IC6c R118 NJM2902V R116 2SC4081 R120 4.7k 22(LMR,L-band only) DTC144EU 10(Others) C293 IC6a NJM2902V R123 DTC363EK 6.8k DAN202U SP GND AF OUT TO SP EXTERNAL SP GND SPEAKER DTC114EU to FAN HORN OPTIONAL CABLE R220...
  • Page 93 AFOUT IC11 IC11 IC6C,D IC4A IC12 RMUT SHIFT AFHPF BEEP MUTE AFATT AFON MICOUT MICIN IC7A IC11 IC11 LIMIT SUPRA- TTER IC8B IC8A MMUT SIGOUT BUFF TONE IC6B DTCS TMUT HORNO AFATT MAIN UNIT AFHPF IC13 FRONT UNIT DIMIN EXPTT PWON DS2-DS11 RFATT...
  • Page 94 November 1998 UHF (7640) MAIN BOARD BOTTOM VIEW FOLDOUT Part No. 001-7600-001...
  • Page 95 M P 10 D 28 2 - G nd 1 - H V B LK D 16 R E D C 19 6 R 17 3 C 19 5 C 84 R 69 Q 18 Q 17 C 92 R 66 R 11 3 R 65 C 91...
  • Page 96 TX:7.9V 13.6V 2SJ377 2SD1664 RX:0V IC2 TA7808F TX:8.5V RX:0V 7.9V 1SS302 1.8V CABLE 5.1V Q12 2SB1132 DTC114EU DAN202U DTC114EU DAN202U TX:0V Q10 2SD1664 RX:7.9V XP6501 TX:0V R53 15k RX:8.5V 4.7k 5.0V 1SS302 IC3 AN78L05M 4.5V CPU5V DTA144EU C72 1 WIDE:0V R112 NAR:4.9V 330k VIN...
  • Page 97 V-UP DS10 V-DN J1 (To Microphone) J2 (To Main Unit) November 1998 Part No. 001-7600-001 VHF/UHF FRONT UNIT BOARD TOP VIEW VHF/UHF FRONT UNIT BOARD BOTTOM VIEW 8-10...
  • Page 98: Front Unit

    LD-HU10140J SEG1 SEG1 SEG2 SEG2 SEG3 SEG3 SEG4 SEG4 SEG5 SEG5 SEG6 SEG6 SEG7 SEG7 SEG8 SEG8 SEG9 SEG9 SEG10 SEG10 SEG11 SEG11 SEG12 SEG12 SEG13 SEG13 SEG14 SEG14 SEG15 SEG15 SEG16 SEG16 SEG17 SEG17 SEG18 SEG18 SEG19 SEG19 SEG20 SEG20 SEG21 SEG21...
  • Page 99 UHF (7640) Transistor Basing Diagrams • TRANSISTORS AND FET'S 2SB1132 R 2SB1143 S 2SC4081 R 2SC4215 O (Symbol: BARB) (Symbol: BR) (Symbol: QO) 2SC5107 O 2SC5110 O 2SD1664 Q 2SJ144 GR (Symbol: MF) (Symbol: MGO) (Symbol: DA) (Symbol: VG) 2SK241 R (TX) 2SK272 2SK536 2SK880 GR...

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