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Mag One
VZ Series
Service Manual
In tro,l u ction
This manual provides technical in formation necessary for servicing the VZ series FM Transceiver.
Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non-qualified
per-sons to ser可ice this equipment may result in permanent damage not covered by the wa
mso
e countnes.
口1
One PCB layout diagrams are provided for each double-sided circuit board in the transceiver. Each side of is referred
to by the type of the majority of components installed on that side (
has only chip components, and the other has either a mixture of both chip and leaded components (varister, coils,
electrolytic capacitors, ICs, etc.), or leaded components only.
While we believe the
technical
for damage that may occur as a result of typographical or other errors that may be present. Your cooperation in pointing
out any inconsistencies in the technical information would be appreciated.
/
This transceiver was assembled using Pb (lead) free solder, based on the Ro HS specification.
Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on this apparatus.
The solderstated above utilizes the alloy composition required for compliance with the lead
any solder with the above alloy composition may be used.
information in this manual to be correct, Mag One assumes no liability
Important Note
Motoro l a So l utions, Inc.
©2017 Motorola Solutions,lnc.
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  • Page 1 Mag One Motoro l a So l utions, Inc. ©2017 Motorola Solutions,lnc. VZ Series HHHHHu HHHHHH mmmmmm 回回回回回 川MMM川 MMMMM 跚跚跚跚跚跚 e-M | | | | 刷刷刷刷刷刷 川川川 户U Service Manual In tro,l u ction This manual provides technical in formation necessary for servicing the VZ series FM Transceiver.
  • Page 2: Table Of Contents

    Contents SPECIFICATIONS........................... 1 INSTRUCTIONS BEFORE USE....................4 VZ‐28 CIRCUIT DESCRIPTION....................7 VZ‐28 BASIC OPERATION....................... 10 1. BUSY CHANNEL LOCK....................10 2. VOX SENSITIVITY......................10 3. TX POWER......................... 10 4. SQUELCH LEVEL......................10 5. BEEP SETTING........................10 6. TIME OUT TIMER(TOT)....................10 7. CTCSS/DCS.........................10 8.
  • Page 3: Specifications

    Specifications VHF version VZ-28-D0-5 General 136-174MHz Frequency Range: Number of Channels: Power Supply Voltage: 7.4 V DC Channel Spacing: 12.5/25 kHz Battery Life (5-5-90 duty cycle with 1800mAh battery): About 11 hours(with Battery save) –25 °C to +60 °C Operating Temperature Range: Frequency Stability: <...
  • Page 4 Specifications UHF version VZ-28-G6-4 General 400-470MHz Frequency Range: Number of Channels: Power Supply Voltage: 7.4 V DC Channel Spacing: 12.5/25 kHz Battery Life (5-5-90 duty cycle with 1800mAh battery): About 11 hours(with Battery save) –25 °C to +60 °C Operating Temperature Range: Frequency Stability: <...
  • Page 5 Specifications 350M version VZ-28-F6-4 General 350-390MHz Frequency Range: Number of Channels: Power Supply Voltage: 7.4 V DC Channel Spacing: 12.5/25 kHz Battery Life (5-5-90 duty cycle with 1800mAh battery): About 11 hours(with Battery save) –25 °C to +60 °C Operating Temperature Range: Frequency Stability: <...
  • Page 6: Instructions Before Use

    VZ-28 Instructions before use Manual Scope: This manual is provided to professionals who are familiar with radio communications or radio communications service with experienced technical staff to use. It contains a wireless radio repair VZ-28 major technical information and data. Precautions: In the case of before don’t carefully verify all RF plugs or any open plugs don’t connect to the appropriate terminals, please don't transmit radio.
  • Page 7 Power On/Off/Volume Adjustment It is for use to turn the radio on/off and to adjust the volume level. LED State Indicator The indicator glows red when transmitting and green when receiving. Channel Knob It is used to select channels. Top Key (Emergency Key) For emergency alarm function.
  • Page 8 read/write the frequency of the radio via PC software. 13.) Battery Latch Fixed / disassemble the battery pack. 14.) Battery Power supply for radio.
  • Page 9: Circuit Description

    VZ-28 Circuit Description 一.RECEIVER The signal from the antenna is passed through a transmission/reception selector circuit and is amplified by T217. The signal after amplified enter to 1846 for processing then output the audio, the audio signal is amplified by UTC2822 and output by the speaker at last.
  • Page 10 三.TRANSMISSION/RECEPTION SELECTOR CIRCUIT The transmission output is passed through the transmission/reception selector circuit and low-pass filter to the antenna. The transmission/reception selector circuit, which consists of diodes D161, D160, D261 and D262, is turned on during transmission and off during reception to switch the signal. 四.DIGITAL CONTROL CIRCUIT SIDE KEY AND ENCODER CIRCUIT The signal from side key and encoder is directly input to the processor.
  • Page 11 五.1846 DESCRIPTION MAINLY SECTION DESCRIPTION 1.DSP consists of IF amplifier, FM modulation, RSSI calculator, AFC control circuit, audio/audio mixer filter, CTCSS/DCS filter and so on. 2.Synthesizer mainly functions: ①The synthesizer produces a local oscillator signal, used to switch the RF input to a continuous low medium frequency.
  • Page 12: Basic Operation

    operation VZ-28 Basic BUSY CHANNEL LOCK This function can prevent other two way radio from disturbing. There are two choices for customer to select in the programming software. FREQUENCY: It is not allowed to transmit or make other operation while the radio is receiving. ...
  • Page 13: End Roger

    END ROGER It is very usefully for hand free users to eliminate the End Roger Beep, You can use programming software to open or close this function. LOW BATTERY WARNING Low battery warning alerts you the battery should be recharged or replaced. While transmitting or receiving, the LED will blink red if the battery is low.
  • Page 15: Series Spare Parts

    VZ-28 Series Spare parts Part No. Part name F001A28M601 VZ-28 Housing F001A28M015 Crab Eye Nut F001A28M075 Channel Selector Knob F001A28M044 ON/OFF/Volume Knob F001A28M068 Rear Cover F001A28M023 Seal Contact F001A28M046 Seal Chassis F001A28M052 Aluminum Chassis F001A28E001 PCBA(400-470MHz) Channel Potentiometer F001A28M009 Volume Potentiometer F001A28M014 F001A28E005 PCBA(136-174MHz)
  • Page 16: Parts List

    VZ-28 PARTS LIST 136-174MHz Footprint Comment Cesignators Capacitance C0402 1 C275 C0402 1 C263 C0402 7 C313 C265 C232 C226 C234 C238 C112 C0402 1 C115 C0402 1 C261 C0402 1 C262 C0402 2 C639 C638 C0402 1 C122 C0402 1 C132 C0402 5 C527...
  • Page 17 C0603 1 C901 100P C0603 1 C159 105P C0603 C231 120P C0603 1 C162 104P C0805 1 C230 10uF/16V C0805 2 C323 C903 1uF/16V C0805 2 E353 C143 4.7uF C0805 2 E180 C878 10uF/16V C0805(A) 2 E911 E913 C0805(A) 1 E356 220uF E-0602 1 E351...
  • Page 18 470R R0402 3 R852 R273 R879 680R R0402 1 R843 R0402 3 R183 R895 C819 R0603 2 R134 L274 L0603 1 L125 R1206 3 R104 R105 R106 RV1208 1 RV221 Inductance 27NH L0603 1 L135 33NH L0603 1 L262 39NH L0603 1 L263 47nH...
  • Page 19 NJM2904 U-SSOP8 1 U170 Other 32.768KHz FX-7*1.5 1 CR815 3.58MHZ FX-CS20 1 CR638 26MHz FX-DS0305 1 CR225 BATTERY JK-C BC-47S-13-D 1 BA901 JP18 JP-18-2 1 JP865 CALL JT-02 1 SW882 MONI JT-02 1 SW881 JT-02 1 SW883 ALARM S-SKHLLBA010 1 SW889 MIRCO USB MIRCO USB2 1 JP751...
  • Page 20 VZ-28 PARTS LIST 400-470MHz Footprint Comment Cesignators Capacitance C0402 3 C277 C261 C274 C0402 C0402 C0402 1 C115 C0402 2 C122 C275 C0402 1 C112 C0402 7 C313 C265 C232 C226 C234 C238 C262 C0402 2 C639 C638 C0402 1 C134 C0402 5 C527 C528...
  • Page 21 100P C0603 1 R134 105P C0603 1 C231 120P C0603 1 C162 104P C0805 1 C230 10uF/16V C0805 2 C323 C903 1uF/16V C0805 2 E353 C143 4.7uF C0805 2 E180 C878 10uF/16V C0805(A) 2 E911 E913 C0805(A) 1 E356 220uF E-0602 1 E351 Resistance...
  • Page 22 680R R0402 1 R843 R0402 2 R183 R895 R0603 1 L125 0.33 R1206 3 R104 R105 R106 RV1208 1 RV221 Inductance 2.2NH L0603 1 L135 10NH L0603 L274 15NH L0603 2 L118 L113 33nH L0603 1 L275 47nH L0603 1 L316 100nH L0603 2 L313...
  • Page 23 NJM2904 U-SSOP8 1 U170 R3111Q271A T-US4 1 U821 Other 32.768KHz FX-7*1.5 1 CR815 3.58MHZ FX-CS20 1 CR638 26MHz FX-DS0305 1 CR225 BATTERY JK-C BC-47S-13-D 1 BA901 JP18 JP-18-2 1 JP865 CALL JT-02 1 SW882 MONI JT-02 1 SW881 JT-02 1 SW883 ALARM S-SKHLLBA010 1 SW889...
  • Page 24 VZ-28 PARTS LIST 350-390MHz Footprint Comment Cesignators Capacitance C0402 1 C261 C0402 2 C115 C274 C0402 1 C275 C0402 1 C112 C0402 1 C122 C0402 6 C313 C238 C234 C226 C232 C265 C0402 1 C132 C0402 4 C638 C639 C134 C262 C0402 5 C529...
  • Page 25 10uF/16V C0805(A) 2 E913 E911 C0805(A) 1 E356 220uF E-0602 1 E351 Resistance R0402 8 R368 R822 R276 R114 R123 R562 C116 C135 R0402 8 R851 R327 R352 R582 R891 R581 C355 R556 R0402 1 R116 R0402 1 R878 R0402 1 R102 R0402 3 R325...
  • Page 26 100nH L0603 2 L313 L317 220NH L0603 1 L160 390NH L0603 1 L117 101T L0603 3 L814 L811 L231 101T L0805 3 L901 L143 L131 2520 1 L169 0.31*1.5*3T 1 L164 0.31*1.5*4T 2 L166 L168 0.4*1.0*4T 1 L261 0.4*1.5*8T 1 L146 0.31*1.2*2T 1 R157 0.4*1.5*4T...
  • Page 27 ST-3013-06 JK-ST-301-5 1 JK871 ANT-1 PX-333-ANT 1 ANT160 BATT J-TEST POINT 1 J1 S-ED08903O 1 SW861 RD810S S-R087FENS 1 SW354...
  • Page 28: Block Diagram

    VZ-28 BLOCK DIAGRAM BATT_i JP751 T111 T121 T131 T141 D160 D161 SW861A 2SC4226 2SC3356 2SK3078 2SK4037 D851 HVC131 D852 LED(R) LED(G) RV221 T851 T852 U821 DTC114EE DTC114EE R3111Q271A U751 R104 U898 T101 U170 T181 R105 D261 D262 HT1621 2SB624 LM2904V DTA114YE 24C32 R106...
  • Page 29: Schematic Diagram

    VZ-28 SCHEMATIC DIAGRAM VZ-28-D0-5 136-174MHz ANT160 ANT-1 T101 R834 2SB624 100K D851 D852 R833 C833 C834 C103 R101 C101 LED(R) LED(G) 150K 220P 104P 104P 103P R159 MICo D180 R160 C143 C144 C145 C183 C128 R128 L131 C141 R141 HZU5.1B 270R C831 C131...
  • Page 30 VZ-28 SCHEMATIC DIAGRAM VZ-28-G6-4 400-470MHz ANT160 ANT-1 T101 R834 2SB624 100K D851 D852 R833 C833 C834 C103 R101 C101 LED(R) LED(G) 150K 220P 104P 104P 104P R159 MICo D180 R160 C143 C144 C145 C183 C128 R128 L131 C141 R141 HZU5.1B 270R C831 C131...
  • Page 31 VZ-28 SCHEMATIC DIAGRAM VZ-28-F6-4 350-390MHz ANT160 ANT-1 T101 R834 2SB624 100K D851 D852 R833 C833 C834 C103 R101 C101 LED(R) LED(G) 150K 220P 104P 104P 104P R159 MICo D180 R160 C143 C144 C145 C183 C128 R128 L131 C141 R141 HZU5.1B 270R C831 C131...
  • Page 32: Vz-28-D0-5 136-174Mhz Components Value

    VZ-28-D0-5 136-174MHz COMPONENTS VALUE...
  • Page 34: Vz-28-D0-5 136-174Mhz Bitmap

    VZ-28-D0-5 136-174MHz BITMAP...
  • Page 36: Vz-28-G6-4 400-470Mhz Components Value

    VZ-28-G6-4 400-470MHz COMPONENTS VALUE...
  • Page 38: Vz-28-G6-4 400-470Mhz Bitmap

    VZ-28-G6-4 400-470MHz BITMAP...
  • Page 40: Vz-28-F6-4 350-390Mhz Components Value

    VZ-28-F6-4 350-390MHz COMPONENTS VALUE...
  • Page 42: Vz-28-F6-4 350-390Mhz Bitmap

    VZ-28-F6-4 350-390MHz BITMAP...
  • Page 44: Pcb Board

    VZ-28 PCB BOARD...
  • Page 48: Guideline Of Troubleshooting

    VZ‐28 GUIDELINE OF TROUBLESHOOTING...

This manual is also suitable for:

Mag one vz-28-d0-5Mag one vz-28-g6-4Mag one vz-28-f6-4

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