Motorola GP328 Plus Service Manual
  1. Manuals
  2. Brands
  3. Motorola Manuals
  4. Two-Way Radio
  5. GP328 Plus
  6. Service manual

Motorola GP328 Plus Service Manual

Portable radios
Hide thumbs
Table of Contents

Advertisement

Quick Links

GP328 Plus/GP338 Plus/GP338 XLS
Portable Radios
Detailed Service Manual
6804112J28-G
December, 2004

Advertisement

Table of Contents
loading

Related Manuals for Motorola GP328 Plus

Summary of Contents for Motorola GP328 Plus

  • Page 1 GP328 Plus/GP338 Plus/GP338 XLS Portable Radios Detailed Service Manual 6804112J28-G December, 2004...

  • Page 2: Computer Software Copyrights

    Motorola. Furthermore, the purchase of Motorola products shall not be deemed to grant, either directly or by implica- tion, estoppel or otherwise, any license under the copyrights, patents or patent applications of Motorola, except for the...
  • Page 3 2000, 2001, 2002, 2003, 2004 by Motorola, Inc. Motorola Technology Sdn. Bhd. (Co. No. 455657-H) Plot 2, Bayan Lepas Technoplex Industrial Park, Mukim 12, S.W.D., 11900 Penang, Malaysia Printed in Malaysia December, 2004...
  • Page 5 Band 1 and UHF Band 2 sections. 6804112J28-E Added GP338 XLS model. May, 2004 Changed to latest Safety Information (Feb. 2002) Corrected flex diagrams of GP328 Plus and GP338 Plus. 6804112J28-F Updated Safety Information (Feb. 2002) Sept, 2004 Updated controller board (PCB no.8404051G07/ G08) to 8404051G09 rev H.
  • Page 6 THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 7: Safety Information

    These recommended RF exposure levels include substantial margins of protection. All Motorola two-way radios are designed, manufactured, and tested to ensure they meet government-established RF exposure levels. In addition, manufacturers also recommend specific operating instructions to users of two-way radios.

  • Page 8: Compliance With Rf Exposure Standards

    Compliance with RF Exposure Standards Your Motorola two-way radio is designed and tested to comply with a number of national and International standards and guidelines (listed below) for human exposure to radio frequency electromagnetic energy. This radio complies with the IEEE (FCC) and ICNIRP exposure limits for occupational/controlled RF exposure environments at operating duty factors of up to 50% talk-50% listen and is authorized by the FCC for occupational use only.

  • Page 9: Approved Accessories

    • When worn on the body, always place the radio in a Motorola-approved clip, holder, holster, case, or body harness for this product. Using approved body-worn accessories is important because the use of non-Motorola-approved accessories may result in exposure levels, which exceed the FCC occupational/controlled environment RF exposure limits.

  • Page 10: Use Of Communication Devices While Driving

    • Not carry the radio in the breast pocket. • Use the ear opposite the pacemaker to minimize the potential for interference. • Turn the radio OFF immediately if there is any reason to suspect that interference is taking place. Hearing Aids Some digital wireless radios may interfere with some hearing aids.

  • Page 11: Operational Cautions

    Warnings for Radios Approved as Intrinsically Safe Radios must ship from the Motorola manufacturing facility with the hazardous atmosphere capability and the intrinsic safety approval labelling (FM, UL, CSA, CENELEC). Radios will not be upgraded to...

  • Page 12: Do Not Substitute Options Or Accessories

    REPAIRS FOR MOTOROLA PRODUCTS WITH INTRINSICALLY SAFE APPROVAL ARE THE RESPONSIBILITY OF THE USER. • Repairs to a Motorola FM approved radio product should only be done at a location that has been FM audited under the FM 3605 repairs and service standard.

  • Page 13: Table Of Contents

    2.0 Warranty and Service Support................1-1 2.1 Warranty Period ..................... 1-1 2.2 After Warranty Period..................1-1 2.3 Piece Parts ..................... 1-2 2.4 Technical Support ..................1-2 2.5 Further Assistance From Motorola ..............1-2 Section 2 Service Aids 1.0 Recommended Test Tools................... 2-1 Section 3 Power Up Self-Test 1.0 Error Codes ......................
  • Page 14 Controller Parts List for UHF 1, UHF 2 and 330MHz (for 8404056G01/G02)..4-31 Section 5A Model Chart and Test Specifications (136-174 Mhz) 1.0 Model Chart....................... 5A-1 2.0 Specifications (for GP328 Plus) ................ 5A-2 3.0 Specifications (for GP338 Plus/GP338 XLS) ............ 5A-3 4.0 Transmitter ......................5A-4 4.1 General ......................5A-4 5.0 Receiver ......................
  • Page 15 Troubleshooting Flow Chart for Synthesizer ............5A-35 Troubleshooting Flow Chart for VCO ..............5A-36 Section 5B Model Chart and Test Specifications (403-470 Mhz) 1.0 Model Chart .......................5B-1 2.0 Specifications (for GP328 Plus).................5B-2 3.0 Specifications (for GP338 Plus/GP338 XLS).............5B-3 4.0 Transmitter......................5B-4 4.1 General......................5B-4 5.0 Receiver......................5B-6 5.1 Receiver Front-End ..................5B-6...
  • Page 16 Troubleshooting Flow Chart for VCO..............5B-34 Section 5C Model Chart and Test Specifications (450-527 Mhz) 1.0 Model Chart....................... 5C-1 2.0 Specifications (for GP328 Plus) ................ 5C-2 3.0 Specifications (for GP338 Plus/GP338 XLS) ............ 5C-3 4.0 Transmitter ......................5C-4 4.1 General ......................5C-4 5.0 Receiver ......................
  • Page 17 Troubleshooting Flow Chart for VCO ............... 5C-36 Section 5D Model Chart and Test Specifications (330-400 Mhz) 1.0 Model Chart ...................... 5D-1 2.0 Specifications (for GP328 Plus)................ 5D-2 3.0 Specifications (for GP338 Plus)................ 5D-3 4.0 Transmitter......................5D-4 4.1 General......................5D-4 5.0 Receiver......................5D-6 5.1 Receiver Front-End ..................
  • Page 18 2.0 Schematic for RF-Controller Interconnect Flex ............6-2 3.0 Universal Connector Flex..................6-3 3.1 GP328 Plus.....................6-3 3.2 GP338 Plus/GP338 XLS.................6-4 4.0 Schematic for Universal Connector Flex..............6-5 4.1 GP328 Plus.....................6-5 4.2 GP338 Plus/GP338 XLS.................6-5 5.0 Parts List for Universal Connector Flex..............6-6 5.1 GP328 Plus.....................6-6...

  • Page 19: Introduction

    In instances where the product is covered under a "return for replacement" or "return for repair" warranty, a check of the product should be performed prior to shipping the unit back to Motorola. This is to ensure that the product has been correctly programmed or has not been subjected to damage outside the terms of the warranty.

  • Page 20: Piece Parts

    Aftermarket Division (AAD). If no part number is assigned, the part is not normally available from Motorola. If the part number is appended with an asterisk, the part is serviceable by Motorola Depot only. If a parts list is not included, this generally means that no user-serviceable parts are available for that kit or assembly.

  • Page 21: Service Aids

    Section 2 SERVICE AIDS Recommended Test Tools Table 2-1 lists the tools recommended for working on this family of radios. These tools are also available from Motorola. Table 2-1: Recommended Test Tools Motorola Part No. Description Application 6680387A59 Extractor, 2-contact...
  • Page 22 Recommended Test Tools THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 23: Power Up Self-Test

    Section 3 POWER UP SELF-TEST Error Codes Turning on the radio using the ON/OFF volume control starts a self-test routine which checks the RAM, ROM checksum, EEPROM hardware and EEPROM checksum. If these checks are successfully completed, the radio will generate the Self-Test Pass Tone. Radio emits only “bonk” (300 Hz) tone if it fails the self-test.
  • Page 24 Error Codes THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 25: Controller Information

    PCIC(ALC) Ext. RX. Buffer (NU) Vdda *Not applicable to GP328 Plus SW. Reg. Figure 4-1: DC Power Distribution Block Diagram Figure 4-1 illustrates the DC distribution throughout the radio board. A 7.5V battery (BATT 7.5V) supplies power directly to the electronic ON/OFFcontrol as UNSWB+. When the radio is turned on, MECH_SWB+ (ON/OFF volume control) will trigger the electronic ON/OFFcontrol(momentary-on path), then SWB+ is distributed as shown in Figure 4-1.

  • Page 26: Controller Board

    The controller board is the central interface between the various subsytems of the radio. It is separated into digital and audio architectures. The digital portion consists of a special Motorola microcontroller (HC11FL0). The audio power amplifier (Audio PA) and audio/signalling/filter/ companding IC (ASFIC_CMP) form the backbone of the audio/signalling architecture.

  • Page 27: Digital Architecture

    Controller Board Digital Architecture MCU configuration There is one common MCU architecture for low-tier as well as for the high-tier products. It covers the Conventional and Trunking portables. An open architecture system with the new HC11FL0 as the processor is used. Combinations of different size RAM, ROM and EEPROM are available for various application software.
  • Page 28 Controller Board ModB/Vstby Supply Under various conditions, the supply to the ModB/Vstby would vary. Table 4-1 shows these conditions and circuits in operation. Table 4-1: ModB/Vstby Supply Modes Condition Circuit Operation Radio On Vdd supply voltage via CR411 Radio Off •...

  • Page 29: Keypad

    Controller Board Keypad The LED_EN setting is set by the codeplug. When the value is set to high, the LED will not light up during power up and vice versa. U602 is a comparator that will compare the voltage when any one of the keypad row or keypad column keys is being pressed.

  • Page 30: Troubleshooting Chart

    Controller Board Troubleshooting Chart Disconnect and reconnect 18-pin Display flex IF STILL OFF Disconnect and reconnect 40-pin Keypad flex Figure 4-5: Keypad Board Troubleshooting Chart...

  • Page 31: Controller Board Diagrams

    Controller Board Diagrams R410 C453 C456 R411 R492 R408 R702 R437 U405 R701 R418 R478 C429 C433 R415 R414 C421 C426 C425 C419 C444 R435 C420 R413 R434 C481 C730 R481 C416 R445 C422 C423 R425 R449 R475 C479 R424 R436 R421 C408...

  • Page 32: Controller Board Top View (Pcb No. 8404051G07/G08)

    C731 C733 C732 C734 SH400 U406 U409 C440 U404 U420 RT400 C480 C475 Q410 C452 U407 U400 CR412 ZMY0130795-O J400 J403 Controller Board Top View (PCB No. 8404051G07/G08)

  • Page 33: Controller Board Top View (Pcb No. 8404051G09)

    R410 R411 C453 C456 R492 R408 R437 R702 R701 R418 R478 C429 C433 R415 R414 C425 C426 C419 C444 R435 C421 C420 C481 C730 R413 R434 C416 R481 R445 C423 C422 R425 R449 R475 R424 R421 C479 R436 C408 R432 C410 R428 C409...

  • Page 34: Controller Board Bottom View (Pcb No.8404051G09)

    4-10 C733 C731 C734 C732 SH400 U406 C440 U404 RT400 C480 C475 C452 U407 U400 CR412 J403 Controller Board Bottom View (PCB No.8404051G09)

  • Page 35: Controller Schematics

    4-11 Controller Schematics C712 C710 C706 C704 C702 C714 C708 470pF 470pF 470pF 470pF 470pF 470pF 470pF C715 C709 C707 C703 C701 C713 C711 C705 470pF 470pF 470pF 470pF 470pF 470pF 470pF 470pF J400 TO/FROM RF 0902042P03 J400-33 RED_LED RED_LED J400-32 GREEN_LED GREEN_LED...

  • Page 36: Controller Asfic/On_Off Schematic Diagram

    4-12 4809579E18 SWB+ (3.3V) BCX71KL Vddd Q400 TP406 BATT_CODE Vddd UNSWB+ C401 C400 0.1uF .01uF R406 R427 2.7K U400 RB731U LP2951ACMM-3.3 C402 C403 4802245J62 0.1uF 10uF CR412 INPUT OUTPUT BATT_DATA_IN FEEDBACK ERROR SHUTDOWN SENSE 4802245J54 VTAP 4 Q405 UMG5 R476 RESET TP410 R416...

  • Page 37: Controller Micro Processor Schematic Diagram

    4-13 Vddd F1200 R457 R409 SCI_TX SCI_RX TP402 TP401 TEST_POINT TEST_POINT R418 Vddd Vddd Vddd R437 C730 C431 C449 C453 C423 470pF 470pF 470pF 470pF 470pF L411 390nH L410 390nH C456 R411 470pF EE_CS R460 C435 0.1uF 4.7K ECLK XIRQ OPT_SEL2 PG0_XA13 RESET...

  • Page 38: Controller Memory Schematic Diagram

    4-14 Vddd C426 C425 0.1uF 470pF Used for Trunking only. U405 Not_placed_SRAM CY62256VLL RAM_CS R428 FLASH_OE Vddd C424 10uF R410 2311049A59 100K C429 0.1uF R478 XA18 R702 U406 AT49HLV010 R408 FLASH_EN EN_CE R492 EN_OE EN_WE FLASH ROM ZMY0130784-O R701 XA18 RESET Controller Memory Schematic Diagram...

  • Page 39: Controller Audio Power Amplifier Schematic Diagram

    4-15 MMBZ5240B 4880140L15 x 5pcs. UNSWB+ OPT_SEL2 SWB+ OPT_SEL1 C475 VR449 VR446 VR447 VR448 10uF VR445 R473 R450 J403 20 PIN CONN 0909059E04 C471 C442 C472 470pF R499 U420 0.1uF R423 470pF TDA8547 C473 J403-20 470K 20 11 470pF J403-19 C447 R472 INT_SPK+...

  • Page 40: Controller Parts List For Vhf (For 8404051G07/G08 And 8404051G09)

    VR450 4880140L15 10V Zener C440 2113743G26 4.7 uF, +80% / -20% C722 2113743L09 470 pF, 10% R437 NOT PLACED * Motorola Depot Servicing only C441 2113743L09 470 pF, 10% C723 2113743L09 470 pF, 10% R445 0662057N08 24 k, 5% C442 2113743E20 0.10 uF, 10%...

  • Page 41: 8404051G09)

    10V Zener C428 2113743M24 100000 pF, +80% / -20% C716 2113743N50 100 pF, 5% R429 0662057N20 75 k, 5% * Motorola Depot Servicing only C429 2113743M24 100000 pF, +80% / -20% C717 2113743N50 100 pF, 5% R431 0662057N39 470 k, 5%...

  • Page 42: Controller Board Diagrams

    4-18 Controller Board Diagrams M605 M604 M606 D602 D601 R620 R621 M607 M608 M609 M610 M611 M612 D605 D604 R618 R619 M614 M615 M613 M618 M616 M617 D606 ZMY0130800-O D603 R623 R622 M619 M620 M621 TP406 TP402 TP415 TP410 TP401 TP405 Controller Board Top View (PCB No.

  • Page 43: Controller Board Bottom View (Pcb No.8404056G01)

    4-19 E638 E639 E640 C750 E641 E642 E643 E644 J702 C751 R492 E645 E634 C424 R408 C613 E703 E702 E637 R428 C610 C429 R410 R632 C611 R463 C612 C616 R602 R601 R646 R603 Q602 Q603 R607 E704 R604 R608 R633 U602 R605 R609...

  • Page 44: Controller Board Top View (Pcb No. 8404056G02)

    4-20 TP406 TP410 TP402 TP401 TP405 TP415 Controller Board Top View (PCB No. 8404056G02)

  • Page 45: Controller Board Bottom View (Pcb No. 8404056G02)

    4-21 E638 E639 E403 E640 E402 C750 E404 E641 E405 E642 E406 E643 E407 E644 C751 R492 E408 E645 E409 E634 E701 R408 C613 E703 E702 E637 R428 C610 C429 R410 R632 C611 R463 C616 C612 R602 R646 R601 R603 R607 E704 R604...

  • Page 46: Controller Schematics

    4-22 Controller Schematics 100pF 100pF 100pF 100pF 100pF 100pF 100pF C714 C712 C710 C708 C706 C704 C702 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF C715 C713 C711 C709 C707 C705 C703 C701 J400 TO/FROM RF 0902042P03 RED_LED J400-33 RED_LED GREEN_LED J400-32 GREEN_LED...

  • Page 47: Controller Asfic/On_Off Schematic Diagram

    4-23 BCX71KL SWB+ 4809579E18 (3.3V) Vddd Q400 TP406 UNSWB+ C401 C400 0.1uF .01uF R406 U400 LP2951ACMM-3.3 C402 C403 0.1uF 10uF INPUT OUTPUT 1 BATT_CODE Vddd FEEDBACK ERROR 5 SHUTDOWN SENSE 2 VTAP 6 R427 TP410 RB731U 2.7K 4802245J62 CR412 R476 C410 0.1uF C405...

  • Page 48: Controller Micro Processor Schematic Diagram

    4-24 Vddd F1200 R457 R409 SCI_TX SCI_RX TP401 TP402 TEST_POINT TEST_POINT R418 UNSWB+ Vddd Vddd Vddd R437 100K C730 C431 C449 C453 C423 100pF 100pF 100pF 100pF 100pF U410 L411 ILC7062CM-33 3.3V 390nH VOUT L410 390nH C456 R411 C434 100pF 0.1uF EE_CS R461...

  • Page 49: Controller Memory Schematic Diagram

    4-25 Vddd C426 C425 100pF 0.1uF Used for Trunking only. U405 5102463J36 CY62256VLL RAM_CS R428 FLASH_OE Vddd C424 10uF R410 2311049A59 100K C429 0.1uF R478 XA18 U406 R408 AT49HLV010 100K 5102463J59 FLASH_EN EN_CE R492 EN_OE EN_WE ZMY0130819-O XA18 Controller Memory Schematic Diagram...

  • Page 50: Controller Audio Power Amplifier Schematic Diagram

    4-26 MMBZ5240B 4880140L15 x 5pcs. UNSWB+ OPT_SEL2 SWB+ C475 OPT_SEL1 VR447 VR448 VR449 10uF VR446 VR445 R473 R450 J403 0909059E04 C471 20 PIN CONN 5102463J44 C442 100pF C472 R499 U420 0.1uF R423 100pF C473 J403-1 TDA8547 470K 20 11 100pF C447 J403-2 INT_SPK+...

  • Page 51: Controller Interface Schematic Diagram (For 8404056G01)

    4-27 J702 16 PINS CONNECTOR P/N.0905505Y03 R721 R632 J702-1 MOSI 4813824A10 DATA R722 100K J702-2 ROW3 ROW4 ROW5 MMBT3904L 100K J702-3 100K M604 M605 M606 R633 J702-4 Q603 SWITCH SWITCH SWITCH 100K J702-5 Q602 4813824A10 J702-6 R648 1 OUT1 OUT1 1 OUT1 MMBT3904L J702-7...

  • Page 52: Controller Interface Schematic Diagram (For 8404056G02)

    4-28 ROW3 ROW4 ROW5 M604 M605 M606 SWITCH SWITCH SWITCH OUT1 1 OUT1 OUT1 OUT2 2 OUT2 OUT2 3 GND COL5 KEYPAD_ROW M607 M608 M609 SWITCH SWITCH SWITCH OUT1 OUT1 OUT1 J702 OUT2 OUT2 OUT2 16 PINS CONNECTOR P/N.0905505Y03 R721 R632 4813824A10 DATA...

  • Page 53: Controller Parts List For Vhf (For 8404056G01/G02)

    4-29 Controller Parts List for VHF (for Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description 8404056G01/G02) Part No. Part No. Part No. C473 2113743L09 470 pF, 10% CR413 4802245J62 Diode Schottky M614 NOT PLACED Circuit Motorola C475 2113743H14 10.0 uF, +80% / -20%...
  • Page 54 51 k, 1% Note: E401 through E409 are NOT PLACED in R603 0662057V05 13 k, 1% 84D04056G01. R604 0662057V11 22 k, 1% * Motorola Depot Servicing only R605 0662057V18 43 k, 1% R606 0662057V30 130 k, 1% R607 0662057V05 13 k, 1%...

  • Page 55: Controller Parts List For Uhf 1, Uhf 2 And 330Mhz (For 8404056G01/G02)

    4-31 Controller Parts List for UHF 1, UHF 2 Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description and 330MHz (for 8404056G01/G02) Part No. Part No. Part No. C473 2113743N50 100 pF, 5% CR413 4802245J62 Diode Schottky M614 NOT PLACED...
  • Page 56 51 k, 1% Note: E401 through E409 are NOT PLACED in R603 0662057V05 13 k, 1% 8404056G01 R604 0662057V11 22 k, 1% * Motorola Depot Servicing only R605 0662057V18 43 k, 1% R606 0662057V30 130 k, 1% R607 0662057V05 13 k, 1%...

  • Page 57: Section 5A

    GP338 Plus 136-174 MHz 5W 128 CH AZH38KDH9DU6 GP338 XLS 136-174 MHz 5W 160 CH Item Description PMUD1892_ GP328 Plus Super Tanapa 136-174 MHz 5W 4CH PMUD1673_ GP328 Plus Super Tanapa 136-174 MHz 5W 16CH PMUD1674_ GP338 Plus Super Tanapa 136-174 MHz 5W 128CH PMUD1770_...

  • Page 58: Specifications (For Gp328 Plus)

    High Li Ion @ 7.5V: Frequency 136-174 MHz Frequency: 136-174 MHz Channel Spacing 12.5/20/25 kHz Channel Capacity: GP328 Plus : 4/16 Chan- nels Freq. Stability 0.00025% (-30°C to +60°C) Power Supply: 7.5 Volts ±20% Spurs/Harmonics: -36 dBm < 1 GHz Dimensions -30 dBm >...
  • Page 59 Specifications (for GP338 Plus/GP338 XLS) 5A-3 Specifications (for GP338 Transmitter Plus/GP338 XLS) General RF Output High Li Ion @ 7.5V: Frequency 136-174 MHz Frequency: 136-174 MHz Channel Spacing 12.5/20/25 kHz Channel Capacity: GP338 Plus 128 Chan- nels/GP338 XLS 160 Freq. Stability 0.00025% Channels (-30°C to +60°C)

  • Page 60: Transmitter

    5A-4 Transmitter Transmitter P C I C Antenna Vcontrol Vcontrol Jack Antenna Switch/ From VCO PA-Final Harmonic Filter/ Driver Stage Matching Network Figure 5-1: Transmitter Block Diagram General (Refer to Figure 5-1) The VHF transmitter contains five basic circuits: 1. Power Amplifier 2.
  • Page 61 Transmitter 5A-5 4.1.2 Antenna Switch The antenna switch circuit consists of two PIN diodes (D3521 and D3551), a pi network (C3531, L3551 and C3550), and two current limiting resistors (R3571, R3572, R3573 ). In the transmit mode, B+ at PCIC (U3502) pin 23 will go low and turn on Q3561 where a B+ bias is applied to the antenna switch circuit to bias the diodes "on".

  • Page 62: Receiver

    5A-6 Receiver Receiver Antenna Pin Diode Varactor Varactor Antenna Crystal RF Amp Mixer IF Amp Tuned Filter Tuned Filter Switch RF Jack Filter First LO from FGU Control Voltage from ASFIC Recovered Audio Demodulator Squelch U3220 RSSI Synthesizer 16.8 MHz Reference Clock SPI Bus Second...

  • Page 63: Receiver Back-End

    Receiver 5A-7 The output of the post-RF amplifier filter is connected to the passive double balanced mixer which consists of T3301, T3302 and CR3301. Matching of the filter to the mixer is provided by C3317, C3318 and L3308. After mixing with the first LO signal from the voltage controlled oscillator (VCO) using high side injection, the RF signal is down-converted to the 45.1 MHz IF signal.

  • Page 64: Automatic Gain Control Circuit

    5A-8 Receiver Automatic Gain Control Circuit (Refer to VHF Receiver Front End Schematic Diagram on page 5A-22 and VHF Receiver Back End Schematic Diagram on page 5A-23) The front end automatic gain control circuit provides automatic reduction of gain, of the front end RF amplifier via feedback.

  • Page 65: Frequency Generation Circuitry

    Frequency Generation Circuitry 5A-9 Frequency Generation Circuitry Voltage Multiplier Rx Out Mixer VCOBIC Aux3 Rx VCO Circuit Vmult1 U3801 Synthesizer Vmult2 U3701 Loop Filter Tx Out PA Driver 16.8 MHz Ref. Osc. Tx VCO Circuit MOD Out Modulating Signal Figure 5-3: Frequency Generation Unit Block Diagram The Frequency Generation Circuitry is composed of two main ICs, the Fractional-N synthesizer (U3701), and the VCO/Buffer IC (U3801).

  • Page 66: Synthesizer

    5A-10 Frequency Generation Circuitry Synthesizer (Refer toVHF Synthesizer Schematic Diagram on page 5A-24) The Fractional-N Synthesizer uses a 16.8MHz crystal (Y3761) to provide a reference for the system. The LVFractN IC (U3701) further divides this to 2.1MHz, 2.225MHz, and 2.4MHz as reference frequencies.

  • Page 67: Vco - Voltage Controlled Oscillator

    Frequency Generation Circuitry 5A-11 VCO - Voltage Controlled Oscillator (Refer toVHF Voltage Controlled Oscillator Schematic Diagram on page 5A-25) AUX3 (U3701 Pin2) U3701 Pin 32 Prescaler Out TRB_IN Pin 20 Pin 19 Pin 12 Pin7 Rx-SW TX/RX/BS Pin13 Tx-SW Switching Network LO RF INJECTION Presc Vcc-Superfilter...
  • Page 68 5A-12 Frequency Generation Circuitry The RF section of the VCOBIC(U3801) is operated at 4.54 V (VSF), while the control section of the VCOBIC and Fractional-N synthesizer (U3701) is operated at 3.3V. The operation logic is shown in Table 5-1. Table 5-1: VCO Control Logic Desired AUX 4 AUX 3...

  • Page 69: Notes For All Schematics And Circuit Boards

    1. Unless otherwise stated, resistances are in Ohms (k = 1000), and capacitances are in picofarads (pF) or microfarads (µF). 2. DC voltages are measured from point indicated to chassis ground using a Motorola DC multime- ter or equivalent. Transmitter measurements should be made with a 1.2 µH choke in series with the voltage probe to prevent circuit loading.
  • Page 70 5A-14 Notes For All Schematics and Circuit Boards THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 71: Circuit Board/Schematic Diagrams And Parts List

    Circuit Board/Schematic Diagrams and Parts List 5A-15 Circuit Board/Schematic Diagrams and Parts List VR444 C3205 PB502 PB501 PB504 C522 C3212 C3213 C502 U3201 R3209 Q3201 C3270 R3202 Y3761 B503 B504 Y3200 C3279 C3210 R3226 R3275 R3225 C3277 VR501 R3212 C3278 C3214 C3203 Q3270...

  • Page 72: Vhf (136-174Mhz) Main Board Bottom Side Pcb No. 8404055G05/G06/G07

    5A-16 Circuit Board/Schematic Diagrams and Parts List VR441 C525 C526 C3223 C3219 C527 C528 R3219 C3227 C529 C3240 C530 R3224 R3222 C531 S502 C3236 C532 C533 B501 C534 C3237 R3223 C3243 Y3762 C535 C536 C3244 C537 CR501 U3220 C538 C3235 C3751 C539 C3221...

  • Page 73: Vhf (136-174Mhz) Main Board Top Side Pcb No. 8404055G09

    Circuit Board/Schematic Diagrams and Parts List 5A-17 C3205 PB501 PB502 VR444 PB504 C522 C3212 C3213 SH3201 R3209 R3202 Y3761 Y3200 C3270 C3279 C3210 R3226 R3275 C3277 R3225 R3212 R3203 C3278 C3203 C3214 TP3702 C3207 R3274 Q3270 R3201 R506 J200 L3200 R3213 TP3701 R3204...

  • Page 74: Vhf (136-174Mhz) Main Board Bottom Side Pcb No. 8404055G09

    5A-18 Circuit Board/Schematic Diagrams and Parts List VR440 VR441 C525 C526 C3223 C3219 C527 C528 R3219 C3227 C529 C3240 C530 R3222 R3224 C531 VR506 S502 C532 C3236 C533 B501 C534 C3237 C3224 R3223 C3243 C535 Y3762 C536 C3244 U3220 C537 CR501 C538 C3235...
  • Page 75 Circuit Board/Schematic Diagrams and Parts List 5A-19 C525 C526 C527 C528 C529 C530 C531 C532 C533 C534 C535 C536 C537 C538 470pF 470pF 470pF 470pF 470pF 470pF 470pF 470pF 470pF 470pF 470pF 470pF 470pF 470pF 16_8MHz_1_SW 16_8MHz_2_SW 16.8MHz J200-1 J200-2 5V_1_SW 5V_2_SW 5V_3_SW...
  • Page 76 5A-20 Circuit Board/Schematic Diagrams and Parts List UNSWB+ F501 PB505 SWITCH mgc_comps T CH S502 MECH_SWB+ 1 A1 I T CH B501 3 A2 TAB2 BATT_CODE DATA EMER C502 C503 C523 L505 0.47uF 1000pF 390nH 390nH 0. 47uF 1000pF VR506 TAB1 100pF 100pF...

  • Page 77: Vhf Controls And Switches Schematic Diagram (Sheet 2 Of 2 For 8404055G09 Pcb)

    Circuit Board/Schematic Diagrams and Parts List 5A-21 UNSWB+ F501 PB505 SWITCH mgc_comps S502 MECH_SWB+ B501 TAB2 DATA BATT_CODE EMER L505 C523 C502 C503 390nH 0.47uF 100pF 1000pF VR506 TAB1 6.8V VR439 C520 CR501 .01uF PB501 SWITCH Vdda LI_ION B503 VR440 C521 .01uF 6.8V...

  • Page 78: Vhf Receiver Front End Schematic Diagram

    5A-22 Circuit Board/Schematic Diagrams and Parts List R5_2_FE R5_3_FE C3320 82pF C3309 R3316 C3337 .022uF 0.1uF L3309 150nH R3321 R3322 UNSWB_PLUS_1_RX UNSWB_PLUS_2_RX R3323 IF_1_FE UNSWB+ L3304 C3308 470nH 330pF C3336 10uF C3307 R3315 100pF C3315 T3301 10pF R3310 C3317 39pF C3311 C3312 C3313...

  • Page 79: Vhf Receiver Back End Schematic Diagram

    Circuit Board/Schematic Diagrams and Parts List 5A-23 Vdd_FILTERED Vdd_FILTERED C3208 R5_3_ZIF R3209 R3200 R3220 R3206 4.7K 100K RSSI C3205 Q3201 C3204 R3201 0.1uF .01uF 2.2K C3220 10pF R3212 R3207 R3208 4.7K L3221 C3239 R3221 C3228 C3210 .01uF .022uF C3229 1000pF C3225 100pF Y3200...

  • Page 80: Vhf Synthesizer Schematic Diagram

    5A-24 Circuit Board/Schematic Diagrams and Parts List U3711 ADP3 mgc_comps SWB_PLUS_1_FN 5V_1_FN 5V_2_FN (SOURCE) SWB+ C3715 C3711 470pF L3701 C3712 C3713 10uF 390nH 0.1uF 2.2uF C3701 .01uF R3701 C3702 .01uF D3701 C3710 C3703 2.2uF .01uF C3704 .01uF BIAS_ADJ_1_FN R3702 R3705 D3702 C3708 R3726...

  • Page 81: Vhf Voltage Controlled Oscillator Schematic Diagram

    Circuit Board/Schematic Diagrams and Parts List 5A-25 Vdda VSF_1_VCO Vdda_3_VCO R5_1_VCO L3813 R3817 R3802 R3811 C3822 C3813 1000pF D3821 C3810 .01uF L3811 C3811 L3824 L3812 C3812 R3818 VCTRL_1_VCO C3825 C3830 R3822 C3804 100nH 0.1uF 0.1uF 100nH 15pF 68pF VCTRL 0.1uF C3818 R3828 022uF...

  • Page 82: Vhf Transmitter Schematic Diagram

    5A-26 Circuit Board/Schematic Diagrams and Parts List RESET_1_PA 5V_2_PA C3571 470pF BIAS_TUNING C3570 CLK_2_PA 330pF R3570 DATA_2_PA R3569 CSX_2_PA 5.6K Q3561 UNSWB_LPLUS_2_PA C3560 MMBT3906 GND2 UNSW_LPLUS_3_PA BPOS NC_U3502_13 DATA R3561 U3502 NC_U3502_12 NC_U3502_11 TEMP H99S-4 NC_U3502_10 RSET LM50C C3566 NC_U3502_9 5185963A15 F168 100pF...

  • Page 83: Vhf Radio Parts List (Rf Board)

    B503 3980502Z01 Contact, Backup B+ C3275 2113743N44 56.0 pF, 5% C3513 2113740F38 30 pF C3709 2113928N01 0.1 uF, 10% (not used in GP328 Plus) C3276 2113743N42 47.0 pF, 5% C3514 2113740F47 68 pF C3710 2104993J02 2.2 uF B504 3980501Z01 Contact, Backup B-...
  • Page 84 5A-28 Circuit Board/Schematic Diagrams and Parts List Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C3818 2113743E07 0.022 uF C548 NOT PLACED L3519 2484657R01 Inductor Bead Chip R3207...
  • Page 85 0662057N15 47 k, 5% ** Not Serviceable R3572 0662057A27 120, 5% R509 0662057M01 0, 5% R3573 0662057A27 120, 5% (not used in GP328 Plus) R3701 0662057M50 100, 5% RT3301 NOT PLACED R3702 NOT PLACED S501 4080710Z01 Channel Switch R3703 0662057M54...
  • Page 86 5A-30 Circuit Board/Schematic Diagrams and Parts List THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 87: Troubleshooting Charts

    Troubleshooting Charts 5A-31 Troubleshooting Charts MCU Check Press PTT. Red LED does not Before replacing light up Power Up Not able to pro- MCU, check SPI Alert Tone Audio at gram RF Board AUDIO clock, SPI data, and AudioPA J403 Audio RF IC select (U420) input at Pin 2 &...

  • Page 88: Troubleshooting Flow Chart For Receiver (Sheet 1

    5A-32 Troubleshooting Charts START Bad SINAD Bad 20dB Quieting No Recovered Audio Audio at pin 27 Check Controller of U3220? Spray of inject 1st IF into XTAL Filter IF Freq: 45.1MHz Check Q3270 bias cir- cuitry for faults. Audio heard? Rotate Freq.

  • Page 89: Troubleshooting Flow Chart For Receiver (Sheet 2

    Troubleshooting Charts 5A-33 Inject RF into J3501 Trace IF signal Q3200 collec- from C3200 to IF Signal at tor OK? Q3200. Check for C3200? IF signal bad XTAL filter. present? Before replacing U3220, check U3220 voltages; 1st LO O/P trace IF signal RF Signal at Check FGU path.

  • Page 90: Troubleshooting Flow Chart For Transmitter

    5A-34 Troubleshooting Charts START No Power Is There B+ Check Q3561 Bias for Ant switch Is Control Voltage Is Current Check PCIC High or Low High Check Drive to Module 1. Check Pin Diodes 2. Check Harmonic Filter Is Drive Troubleshoot Inspect/Repair Tx.

  • Page 91: Troubleshooting Flow Chart For Synthesizer

    Troubleshooting Charts 5A-35 Check U3201, 3.3V at U3701 Start L3731 pins 5, 20, 34 & Visual Check D3701, D3702, Correct check of the U3701, C3701 - Problem Board OK? C3707 Is 16.8MHz 16.8MHz Is U3701 Pin 47 Replace at pin 6 of Signal at signal at AT = 13 VDC...

  • Page 92: Troubleshooting Flow Chart For Vco

    5A-36 Troubleshooting Charts START Change U3801 L3831, Change L3831, L3832, No LO? L3832 L3833 O/C? Pin 10 TRB = 3.2V? Tx Carrier? >1V? VCO OK Check R3811, L3811 for dry joint or faulty AUX 3 Check High? R3829 Change Check U3701 L3821, Pin 2 for 3.2V L3822,...

  • Page 93: Section 5B

    GP338 Plus 403-470 MHz 4W 128 CH AZH38RDH9DU6 GP338 XLS 403-470 MHz 4W 160 CH Item Description PMUE2048_ GP328 Plus Super Tanapa 403-470 MHz 4W 4CH PMUE1699_ GP328 Plus Super Tanapa 403-470 MHz 4W 16CH PMUE1700_ GP338 Plus Super Tanapa 403-470 MHz 4W 128CH PMUE1876_...

  • Page 94: Specifications (For Gp328 Plus)

    High Li Ion @ 7.5V: Frequency 403-470 MHz Frequency: 403-470 MHz Channel Spacing 12.5/20/25 kHz Channel Capacity: GP328 Plus : 4/16 Chan- nels Freq. Stability 0.00025% (-30°C to +60°C) Power Supply: 7.5 Volts ±20% Spurs/Harmonics: -36 dBm < 1 GHz Dimensions -30 dBm >...
  • Page 95 Specifications (for GP338 Plus/GP338 XLS) 5B-3 Specifications (for GP338 Transmitter Plus/GP338 XLS) General RF Output High Li Ion @ 7.5V: Frequency 403-470 MHz Frequency: 403-470 MHz Channel Spacing 12.5/20/25 kHz Channel Capacity: GP338 Plus 128 Chan- nels/GP338 XLS 160 Freq. Stability 0.00025% Channels (-30°C to +60°C)

  • Page 96: Transmitter

    5B-4 Transmitter Transmitter P C I C Antenna Vcontrol Vcontrol Jack Antenna Switch/ From VCO PA-Final Harmonic Filter/ Driver Stage Matching Network Figure 5-1: Transmitter Block Diagram General (Refer to Figure 5-1) The UHF transmitter contains five basic circuits: 1. Power Amplifier 2.
  • Page 97 Transmitter 5B-5 4.1.2 Antenna Switch The antenna switch circuit consists of two PIN diodes (CR101 and CR102), a pi network (C107, L104 and C106), and two current limiting resistors (R101, R170). In the transmit mode, B+ at PCIC (U102) pin 23 will go low and turn on Q111 where a B+ bias is applied to the antenna switch circuit to bias the diodes "on".

  • Page 98: Receiver

    5B-6 Receiver Receiver Antenna Pin Diode Varactor Varactor Antenna Crystal RF Amp Mixer IF Amp Tuned Filter Tuned Filter Switch RF Jack Filter First LO from FGU Control Voltage from ASFIC Recovered Audio Demodulator Squelch U301 RSSI Synthesizer 16.8 MHz Reference Clock SPI Bus Second...

  • Page 99: Receiver Back-End

    Receiver 5B-7 The output of the post-RF amplifier filter which is connected to the passive double balanced mixer consists of T301, T302 and CR306. Matching of the filter to the mixer is provided by C381. After mixing with the first LO signal from the voltage controlled oscillator (VCO) using low side injection, the RF signal is down-converted to the 45.1 MHz IF signal.

  • Page 100: Automatic Gain Control Circuit

    5B-8 Receiver Automatic Gain Control Circuit (Refer to UHF Receiver Front End Schematic Diagram on page 5B-21) The front end automatic gain control circuit is to provide automatic gain reduction of the front end RF amplifier via feedback. This action is necessary to prevent overloading of back end circuits. This is achieved by drawing some of the output power from the RF amplifier’s output.

  • Page 101: Frequency Generation Circuitry

    Frequency Generation Circuitry 5B-9 Frequency Generation Circuitry Dual Tran- sistor Voltage Multiplier Rx Out Matching Pass Mixer Network Filter VCOBIC Aux3 Rx VCO Circuit Vmult1 U241 Aux4 Synthesizer Vmult2 U201 Loop Filter Tx Out Attenuator PA Driver 16.8 MHz Ref. Osc. MOD Out Tx VCO Circuit Modulating...

  • Page 102: Synthesizer

    5B-10 Frequency Generation Circuitry Synthesizer (Refer to UHF Synthesizer Schematic Diagram on page 5B-23) The Fractional-N Synthesizer uses a 16.8MHz crystal (FL201) to provide a reference for the system. The LVFractN IC (U201) further divides this to 2.1MHz, 2.225MHz, and 2.4MHz as reference frequencies.

  • Page 103: Vco - Voltage Controlled Oscillator

    Frequency Generation Circuitry 5B-11 VCO - Voltage Controlled Oscillator (Refer to UHF Voltage Controlled Oscillator Schematic Diagram on page 5B-24) AUX3 (U201 Pin2) Level Shifter AUX4 (U201 Pin3) Network U201 Pin 32 Prescaler Out TRB_IN Pin 20 Pin 19 Pin 12 Pin7 Rx-SW TX/RX/BS...
  • Page 104 5B-12 Frequency Generation Circuitry The VCOBIC(U241) is operated at 4.54 V (VSF) and Fractional-N synthesizer (U201) at 3.3V. This difference in operating voltage requires a level shifter consisting of Q260 and Q261 on the TRB line. The operation logic is shown in Table 5-1. Table 5-1: Level Shifter Logic Desired AUX 4...

  • Page 105: Notes For All Schematics And Circuit Boards

    1. Unless otherwise stated, resistances are in Ohms (k = 1000), and capacitances are in picofarads (pF) or microfarads (µF). 2. DC voltages are measured from point indicated to chassis ground using a Motorola DC multime- ter or equivalent. Transmitter measurements should be made with a 1.2 µH choke in series with the voltage probe to prevent circuit loading.
  • Page 106 5C-14 Notes For All Schematics and Circuit Boards THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 107: Circuit Board/Schematic Diagrams And Parts List

    Circuit Board/Schematic Diagrams and Parts List 5B-15 Circuit Board/Schematic Diagrams and Parts List C522 VR441 PB502 PB501 PB504 VR440 C521 R300 R352 C397 FL201 RT301 R314 R321 C362 C363 C328 R335 VR501 C325 R338 J200 R506 R325 L325 TP201 C385 C351 C353 C384...

  • Page 108: Uhf (403-470Mhz) Main Board Bottom Side Pcb No. 8404077G05/G06/G07

    Circuit Board/Schematic Diagrams and Parts List C523 VR442 C525 L505 C526 C527 C528 L330 C359 C529 C530 C531 S502 C338 C532 C533 C358 C534 C357 C535 C390 R350 C344 C536 C537 R344 C383 C538 C539 C360 R311 C540 C346 C541 C542 C361 R312...

  • Page 109: Uhf (403-470Mhz) Main Board Top Side Pcb No. 8404077G09

    Circuit Board/Schematic Diagrams and Parts List 5B-17 C522 C521 VR441 PB504 PB501 PB502 VR440 C505 C554 R300 VR444 R352 C397 FL201 R334 R507 RT301 R314 R321 FL301 CR310 C363 C328 C325 C362 VR501 R335 L332 R338 R326 C391 TP201 J200 R506 L325 R325...

  • Page 110: Uhf (403-470Mhz) Main Board Bottom Side Pcb No. 8404077G09

    Circuit Board/Schematic Diagrams and Parts List VR506 C523 C525 L505 C526 C527 C528 L330 C359 C529 C530 C531 S502 C338 C532 C358 C533 C534 C357 C279 C535 B501 C536 R350 C390 C278 C344 U248 C537 R344 C538 C383 C539 C360 C540 C346 R311...
  • Page 111 Circuit Board/Schematic Diagrams and Parts List 5B-19 BATTERY_CONTACT L505 B501 LI_ION B503 390nH UNSWB+ BATT_CODE RADIO_CODE DATA B504 F501 BATT+ S502 Vdda SWITCH BATT- MECH_SWB+ CONN_J CR501 VR439 TAB2 C525 C528 C529 C530 C531 C532 C533 C534 C535 C536 C537 C538 C526 C527...

  • Page 112: Uhf Controls And Switches Schematic Diagram (Sheet 1

    Circuit Board/Schematic Diagrams and Parts List BATTERY_CONTACT L505 B501 390nH LI_ION B503 RADIO_CODE 2 DATA UNSWB+ BATT_CODE 1 NEG B504 BATT+ 3 POS F501 CONN_J Vdda S502 BATT- MECH_SWB+ SWITCH VR439 CR501 TAB2 7 C525 C526 C527 C528 C529 C530 C531 C532 C533...

  • Page 113: Uhf Receiver Front End Schematic Diagram

    Circuit Board/Schematic Diagrams and Parts List 5B-21 DACRx C322 82pF R342 100K L310 150nH R308 R305 C314 C315 R310 0.1uF 100pF R304 C380 R309 .01uF L304 CR306 C321 180nH C306 100pF T301 XFMR C309 C308 100pF R306 R307 100pF 100K C312 100K C310...

  • Page 114: Uhf Receiver Back End Schematic Diagram

    Circuit Board/Schematic Diagrams and Parts List L331 R343 2.2uH Vdd_FILTERED Vdda C382 (SOURCE) 10uF DEMOD R350 C348 C347 C344 C346 C345 100K 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF C390 C329 100pF 0.1uF C343 0.22uF R344 R355 SH323 SH321 SH322 SHIELD SHIELD SHIELD Q320 C383...

  • Page 115: Uhf Synthesizer Schematic Diagram

    Circuit Board/Schematic Diagrams and Parts List 5B-23 U210 U211 TC7SET04FU TC7SET04FU C265 C257 C296 100pF 0.1uF C258 .01uF U247 ADP3300 C259 SWB+ .01uF (SOURCE) CR201 C291 C294 C293 0.47uF L202 4V_3.3V 100pF 0.47uF U248 2.2uH LP2980 L203 C277 C278 2.2uH C230 C229 C228...

  • Page 116: Uhf Voltage Controlled Oscillator Schematic Diagram

    Circuit Board/Schematic Diagrams and Parts List C281 R245 100pF R242 L243 C250 C276 C285 RESONATOR 7.5pF C286 2.2uF 100pF 0.1uF C246 L281 L273 100pF R241 390nH 33nH C242 7.5pF C272 C273 0.1uF C243 L271 L242 R244 7.5pF 68nH 220nH C245 RX_INJ 2.4pF TX_INJ...

  • Page 117: Uhf Transmitter Schematic Diagram

    Circuit Board/Schematic Diagrams and Parts List 5B-25 E101 BEAD R102 UNSWB+ L107 C114 C123 33.47nH 100pF 10uF C172 UNSWB+ C108 0.1uF L105 100pF 390nH R106 C109 L106 100pF 7.66nH Microstrip Microstrip R172 L108 L109 C121 C160 L112 11.03nH 100pF 100pF 390nH Q110 4.22nH...

  • Page 118: Uhf Band 1 Radio Parts List (Rf Board)

    100.0 pF, 5% B503 3980502Z01 Contact, Backup B+ C172 2113740F51 C265 NOT PLACED C333 NOT PLACED (not used in GP328 Plus) C173 2113743M08 22000 pF, +80% / -20% C271 NOT PLACED C334 2113743M08 22000 pF, +80% / -20% B504 3980501Z01...
  • Page 119 Circuit Board/Schematic Diagrams and Parts List 5B-27 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C391 NOT PLACED CR201 4802233J09 Triple Diode L281 2462587V41 390 nH, 10% R130...
  • Page 120 RF PCB R507 0662057M01 0, 5% 8404077G06 RF PCB R509 0662057M01 0, 5% 8404077G07 RF PCB (not used in GP328 Plus) 8404077G09 RF PCB R510 0662057M01 0, 5% * Motorola Depot Servicing only R511 NOT PLACED ** Not Serviceable RT300...

  • Page 121: Troubleshooting Charts

    Troubleshooting charts 5B-29 Troubleshooting charts MCU Check Press PTT. Red LED does not Before replacing light up Power Up Not able to pro- MCU, check SPI Alert Tone Audio at gram RF Board AUDIO clock, SPI data, and AudioPA J403 Audio RF IC select (U420) at Pin 2 &...

  • Page 122: Troubleshooting Flow Chart For Receiver (Sheet 1

    5B-30 Troubleshooting charts START Bad SINAD Bad 20dB Quieting No Recovered Audio Audio at pin 27 Check Controller of U301? Spray of inject 1st IF into XTAL Filter IF Freq: 45.1MHz Check Q320 bias cir- cuitry for faults. Audio heard? Rotate Freq.

  • Page 123: Troubleshooting Flow Chart For Receiver (Sheet 2

    Troubleshooting charts 5B-31 Inject RF into J101 Trace IF signal Q302 collector from L311 to IF Signal at Q302. Check for L311? IF signal bad XTAL filter. present? Before replacing U301, check U301 voltages; 1st LO O/P trace IF signal RF Signal at Check FGU path.

  • Page 124: Troubleshooting Flow Chart For Transmitter

    5B-32 Troubleshooting charts START No Power Is There B+ Check Q111 Bias for Ant switch Is Control Voltage Check PCIC Is Current High or Low High Check Drive to Module 1. Check Pin Diodes 2. Check Harmonic Filter Is Drive Troubleshoot Inspect/Repair Tx.

  • Page 125: Troubleshooting Flow Chart For Synthesizer

    Troubleshooting charts 5B-33 Check U248, 3.3V at U201 Start L201 & L202 pins 5, 20, 34 & Visual Check CR201, U210, Correct check of the U211, C258, C259 & Problem Board OK? C228 Is U201 Pin 47 Is 16.8MHz 16.8MHz at pin 6 of Replace AT = 13 VDC...

  • Page 126: Troubleshooting Flow Chart For Vco

    5B-34 Troubleshooting charts START Change U241 No LO? Change L253 O/C? L253 Pin 10 TRB = 5V? Tx Carrier? >1V? VCO OK Check R245 for dry joint or faulty AUX 3 Check High? R260 Check U201 Pin 2 for 3.2V Change L243 V ctrl 0V...

  • Page 127: Section 5C

    GP338 Plus 450-527 MHz 4W 128 CH AZH38SDH9DU6 GP338 XLS 450-527 MHz 4W 160 CH Item Description PMUE2049_ GP328 Plus Super Tanapa 450-527 MHz 4W 4CH PMUE1701_ GP328 Plus Super Tanapa 450-527 MHz 4W 16CH PMUE1702_ GP338 Plus Super Tanapa 450-527 MHz 4W 128CH PMUE1877_...

  • Page 128: Specifications (For Gp328 Plus)

    High Li Ion @ 7.5V: Frequency 450-527 MHz Frequency: 450-527 MHz Channel Spacing 12.5/20/25 kHz Channel Capacity: GP328 Plus : 4/16 Chan- nels Freq. Stability 0.00025% (-30°C to +60°C) Power Supply: 7.5 Volts ±20% Spurs/Harmonics: -36 dBm < 1 GHz Dimensions -30 dBm >...
  • Page 129 Specifications (for GP338 Plus/GP338 XLS) 5C-3 Specifications (for GP338 Transmitter Plus/GP338 XLS) General RF Output High Li Ion @ 7.5V: Frequency 450-527 MHz Frequency: 450-527 MHz Channel Spacing 12.5/20/25 kHz Channel Capacity: GP338 Plus 128 Chan- nels/GP338 XLS 160 Freq. Stability 0.00025% Channels (-30°C to +60°C)

  • Page 130: Transmitter

    5C-4 Transmitter Transmitter P C I C Antenna Vcontrol Vcontrol Jack Antenna Switch/ From VCO PA-Final Harmonic Filter/ Driver Stage Matching Network Figure 5-1: Transmitter Block Diagram General (Refer to Figure 5-1) The UHF transmitter contains five basic circuits: 1. Power Amplifier 2.
  • Page 131 Transmitter 5C-5 4.1.2 Antenna Switch The antenna switch circuit consists of two PIN diodes (CR101 and CR102), a pi network (C107, L104 and C106), and two current limiting resistors (R101, R170). In the transmit mode, B+ at PCIC (U102) pin 23 will go low and turn on Q111 where a B+ bias is applied to the antenna switch circuit to bias the diodes "on".

  • Page 132: Receiver

    5C-6 Receiver Receiver Antenna Pin Diode Varactor Varactor Antenna Crystal RF Amp Mixer IF Amp Tuned Filter Tuned Filter Switch RF Jack Filter First LO from FGU Control Voltage from ASFIC Recovered Audio Demodulator Squelch U301 RSSI Synthesizer 16.8 MHz Reference Clock SPI Bus Second...

  • Page 133: Receiver Back-End

    Receiver 5C-7 The output of the post-RF amplifier filter which is connected to the passive double balanced mixer consists of T301, T302 and CR306. Matching of the filter to the mixer is provided by C381. After mixing with the first LO signal from the voltage controlled oscillator (VCO) using low side injection, the RF signal is down-converted to the 45.1 MHz IF signal.

  • Page 134: Automatic Gain Control Circuit

    5C-8 Receiver Automatic Gain Control Circuit (Refer to UHF Band 2 Receiver Front End Schematic Diagram on page 5C-22) The front end automatic gain control circuit is to provide automatic gain reduction of the front end RF amplifier via feedback. This action is necessary to prevent overloading of back end circuits. This is achieved by drawing some of the output power from the RF amplifier’s output.

  • Page 135: Frequency Generation Circuitry

    Frequency Generation Circuitry 5C-9 Frequency Generation Circuitry Dual Tran- sistor Voltage Multiplier Rx Out Matching Pass Mixer Network Filter VCOBIC Aux3 Rx VCO Circuit Vmult1 U241 Aux4 Synthesizer Vmult2 U201 Loop Filter Tx Out Attenuator PA Driver 16.8 MHz Ref. Osc. MOD Out Tx VCO Circuit Modulating...

  • Page 136: Synthesizer

    5C-10 Frequency Generation Circuitry Synthesizer (Refer to UHF Band 2 Synthesizer Schematic Diagram on page 5C-24) The Fractional-N Synthesizer uses a 16.8MHz crystal (FL201) to provide a reference for the system. The LVFractN IC (U201) further divides this to 2.1MHz, 2.225MHz, and 2.4MHz as reference frequencies.

  • Page 137: Vco - Voltage Controlled Oscillator

    Frequency Generation Circuitry 5C-11 VCO - Voltage Controlled Oscillator (Refer to UHF Band 2 Voltage Controlled Oscillator Schematic Diagram on page 5C-25) AUX3 (U201 Pin2) Level Shifter AUX4 (U201 Pin3) Network U201 Pin 32 Prescaler Out TRB_IN Pin 20 Pin 19 Pin 12 Pin7 Rx-SW...
  • Page 138 5C-12 Frequency Generation Circuitry The VCOBIC(U241) is operated at 4.54 V (VSF) and Fractional-N synthesizer (U201) at 3.3V. This difference in operating voltage requires a level shifter consisting of Q260 and Q261 on the TRB line. The operation logic is shown in Table 5-1. Table 5-1: Level Shifter Logic Desired AUX 4...

  • Page 139: Notes For All Schematics And Circuit Boards

    1. Unless otherwise stated, resistances are in Ohms (k = 1000), and capacitances are in picofarads (pF) or microfarads (µF). 2. DC voltages are measured from point indicated to chassis ground using a Motorola DC multime- ter or equivalent. Transmitter measurements should be made with a 1.2 µH choke in series with the voltage probe to prevent circuit loading.
  • Page 140 5C-14 Notes For All Schematics and Circuit Boards THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 141: Circuit Board/Schematic Diagrams And Parts List

    Circuit Board/Schematic Diagrams and Parts List 5C-15 Circuit Board/Schematic Diagrams and Parts List PB502 PB501 PB504 VR444 R300 R352 C397 RT301 R314 R321 VR501 C328 C362 C363 C325 R335 R338 TP201 L325 J200 R506 R325 C385 C351 C353 C352 C384 SH201 R206 Q316...

  • Page 142: Uhf Band 2 (450-527Mhz) Main Board Bottom Side Pcb No. 8404102G03/G04/G05

    5C-16 Circuit Board/Schematic Diagrams and Parts List M301 M101 C523 C522 L505 C525 C526 C527 C528 VR506 L330 C529 C359 C530 C277 C531 S502 C338 C357 C532 C533 C358 C534 C535 R350 C344 C536 C537 C390 C278 R344 C538 C360 U248 C539 C383...

  • Page 143: Uhf Band 2 (450-527Mhz) Main Board Top Side Pcb No. 8404102G07

    Circuit Board/Schematic Diagrams and Parts List 5C-17 PB504 PB501 PB502 C505 VR444 R300 R352 C397 FL201 R507 R321 FL301 R314 RT301 C363 C325 C362 VR501 C328 R335 L332 TP201 C216 R338 L325 J200 R506 R325 C385 C353 SH201 C351 C384 C323 C294 C352...

  • Page 144: Uhf Band 2 (450-527Mhz) Main Board Bottom Side Pcb No. 8404102G07

    5C-18 Circuit Board/Schematic Diagrams and Parts List C522 C525 L505 C526 C527 VR441 C528 L330 VR506 C359 C529 C530 C277 C531 S502 C338 C532 C533 C358 C534 C357 Y201 C535 R350 C536 C390 C344 C537 C278 U248 R344 C538 C383 R205 C327 C539...

  • Page 145: Uhf Band 2 Controls And Switches Schematic Diagram (Sheet 1 Of 2)

    Circuit Board/Schematic Diagrams and Parts List 5C-19 C538 C537 C536 C535 C534 C533 C532 C531 C530 C529 C528 C527 C526 C525 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF J200 J200-1 J200-2 J200-3 J200-4 J200-5 EMER J200-6...
  • Page 146 5C-20 Circuit Board/Schematic Diagrams and Parts List RADIO_CODE B501 L505 UNSWB+ BATTERY_CONTACT 390nH BATT_CODE DATA BATT+ F501 CONN_J S502 BATT- MECH_SWB+ SWITCH LI_ION B503 TAB2 VR506 B504 C502 CR501 VR439 C503 TAB1 6.8V 0.47uF 100pF R507 C505 6.8V VR501 100pF Vdda PB501 SWITCH...

  • Page 147: Uhf Band 2 Controls And Switches Schematic Diagram (Sheet 2 Of 2 For 8404102G07 Pcb)

    Circuit Board/Schematic Diagrams and Parts List 5C-21 RADIO_CODE B501 L505 UNSWB+ BATTERY_CONTACT 390nH BATT_CODE DATA BATT+ F501 CONN_J S502 BATT- SWITCH MECH_SWB+ LI_ION B503 VR439 CR501 TAB2 VR506 B504 C502 C503 TAB1 0.47uF 6.8V 100pF R507 C505 6.8V VR501 100pF Vdda PB501 SWITCH...

  • Page 148: Uhf Band 2 Receiver Front End Schematic Diagram

    5C-22 Circuit Board/Schematic Diagrams and Parts List DACRx C322 82pF R342 -63.8dBm@45.1MHz 100K L310 150nH R310 C315 R308 R305 C314 100pF 0.1uF R304 R309 C380 .01uF -51.7dBm@450.125MHz C321 CR306 L304 -52.6dBm@526.925MHz 100pF 180nH C306 T301 XFMR C309 C308 100pF R306 R307 100pF C312...

  • Page 149: Uhf Band 2 Receiver Back End Schematic Diagram

    Circuit Board/Schematic Diagrams and Parts List 5C-23 L331 R343 2.20uH Vdd_FILTERED Vdda C382 (SOURCE) 10uF DEMOD R350 C348 C347 C345 C344 C346 100K 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF C390 C329 100pF 0.1uF C343 0.22uF R344 R345 R355 2.628V 3.185V Q320 C342 C357 C384...

  • Page 150: Uhf Band 2 Synthesizer Schematic Diagram

    5C-24 Circuit Board/Schematic Diagrams and Parts List U210 C257 U211 TC7ST04FU 100pF C296 C265 TC7ST04FU 0.1uF C258 7.5V .01uF 1.65V U247 ADP3300 C259 SWB+ .01uF CR201 (SOURCE) C294 C293 C291 100pF 0.47uF 3 K3 A3 4 0.47uF L202 4V_3.3V A2 5 U248 2 K2 2.2uH...

  • Page 151: Uhf Band 2 Voltage Controlled Oscillator Schematic Diagram

    Circuit Board/Schematic Diagrams and Parts List 5C-25 C281 R245 100pF R242 C250 L243 4.3pF C276 C285 C286 4.6V 2.2uF 100pF RESONATOR 0.1uF C246 L281 L273 100pF R241 390nH 18nH C242 4.3pF C272 C273 1.1pF 0.1uF C243 L271 L242 R244 4.3pF 27nH 22nH C245...

  • Page 152: Uhf Band 2 Transmitter Schematic Diagram

    5C-26 Circuit Board/Schematic Diagrams and Parts List E101 BEAD R102 UNSWB+ L107 C114 C123 C108 33.47nH 100pF 10uF 100pF L105 390nH C172 UNSWB+ 0.1uF R106 C109 L106 100pF 7.66nH Microstrip Microstrip R172 L109 L108 C121 C160 L112 4.22nH 11.03nH 100pF 56pF 390nH Q110...

  • Page 153: Uhf Band 2 Radio Parts List (Rf Board)

    Contact, Backup B+ C172 2113743E20 0.10 uF, 10% C259 2113743L41 10000 pF, 10% C326 2113743L41 10000 pF, 10% (not used in GP328 Plus) C173 2113743M08 22000 pF, +80% / -20% C260 2113743N50 100 pF, 5% C327 2113743N50 100 pF, 5%...
  • Page 154 5C-28 Circuit Board/Schematic Diagrams and Parts List Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C382 2311049A59 10.0 uF, 10% CR102 4802245J41 PIN Diode L253 2460593C03 Teflon Resonator...
  • Page 155 RF PCB R507 0662057M01 0, 5% 8404102G05 RF PCB R509 0662057M01 0, 5% 8404102G07 RF PCB (not used in GP328 Plus) * Motorola Depot Servicing only R510 0662057M01 0, 5% ** Not Serviceable R511 NOT PLACED RT300 0680590Z01 Thermistor 33k...
  • Page 156 5C-30 Circuit Board/Schematic Diagrams and Parts List THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 157: Troubleshooting Charts

    Troubleshooting charts 5C-31 Troubleshooting charts MCU Check Press PTT. Red LED does not Before replacing light up Not able to pro- Power Up MCU, check SPI gram RF Board Audio at AUDIO Alert Tone clock, SPI data, and AudioPA (U420) J403 Audio RF IC select input...

  • Page 158: Troubleshooting Flow Chart For Receiver (Sheet 1

    5C-32 Troubleshooting charts START Bad SINAD Bad 20dB Quieting No Recovered Audio Audio at pin 27 Check Controller of U301? Spray of inject 1st IF into XTAL Filter IF Freq: 45.1MHz Check Q320 bias cir- cuitry for faults. Audio heard? Rotate Freq.
  • Page 159 Troubleshooting charts 5C-33 Inject RF into J101 Trace IF signal Q302 collector from L311 to IF Signal at Q302. Check for L311? IF signal bad XTAL filter. present? Before replacing U301, check U301 voltages; 1st LO O/P trace IF signal RF Signal at Check FGU path.

  • Page 160: Troubleshooting Flow Chart For Transmitter

    5C-34 Troubleshooting charts START No Power Is There B+ Check Q111 Bias for Ant switch Is Control Voltage Check PCIC Is Current High or Low High Check Drive to Module 1. Check Pin Diodes 2. Check Harmonic Filter Is Drive Troubleshoot Inspect/Repair Tx.

  • Page 161: Troubleshooting Flow Chart For Synthesizer

    Troubleshooting charts 5C-35 Check U248, 3.3V at U201 Start L201 & L202 pins 5, 20, 34 & Visual Correct Check CR201, U210, check of the Problem U211, C258, C259 & Board OK? C228 16.8MHz Is 16.8MHz Is U201 Pin 47 at pin 6 of Replace signal at...

  • Page 162: Troubleshooting Flow Chart For Vco

    5C-36 Troubleshooting charts START Change U241 No LO? Change L253 O/C? L253 Pin 10 TRB = 5V? Tx Carrier? >1V? VCO OK Check R245 for dry joint or faulty AUX 3 Check High? R260 Check U201 Pin 2 for 3.2V Change L243 V ctrl 0V...

  • Page 163: Section 5D

    MODEL CHART AND TEST SPECIFICATIONS (330-400 MHZ) Model Chart GP Series, 330-400 MHz Model Description AZH38PDC9AA3 GP328 Plus 330-400 MHz 4W 16 CH AZH38PDH9AA6 GP338 Plus 330-400 MHz 4W 128 CH Item Description PMUD1675 GP328 Plus Super Tanapa 330-400 MHz 4W...

  • Page 164: Specifications (For Gp328 Plus)

    330-400MHz Li Ion @ 7.5V: Frequency 330-400 MHz Frequency: 330-400 MHz Channel Spacing 12.5/20/25 kHz Channel Capacity: GP328 Plus : 16 Chan- nels Freq. Stability 0.00025% (-30°C to +60°C) Power Supply: 7.5 Volts ±20% Spurs/Harmonics: -36 dBm < 1 GHz Dimensions -30 dBm >...

  • Page 165: Specifications (For Gp338 Plus)

    Specifications (for GP338 Plus) 5D-3 Specifications (for GP338 Transmitter Plus) 330-400MHz General RF Output High 330-400MHz Li Ion @ 7.5V: Frequency 330-400 MHz Frequency: 330-400 MHz Channel Spacing 12.5/20/25 kHz Channel Capacity: GP338 Plus : 128 Chan- nels Freq. Stability 0.00025% (-30°C to +60°C) Power Supply:...

  • Page 166: Transmitter

    5D-4 Transmitter Transmitter P C I C Antenna Vcontrol Vcontrol Jack Antenna Switch/ From VCO PA-Final Harmonic Filter/ Driver Stage Matching Network Figure 5-1: Transmitter Block Diagram General (Refer to Figure 5-1) The transmitter contains five basic circuits: 1. Power Amplifier 2.
  • Page 167 Transmitter 5D-5 4.1.2 Antenna Switch The antenna switch circuit consists of two PIN diodes (CR101 and CR102), a pi network (C107, L104 and C106), and two current limiting resistors (R101, R170). In the transmit mode, B+ at PCIC (U102) pin 23 will go low and turn on Q111 where a B+ bias is applied to the antenna switch circuit to bias the diodes "on".

  • Page 168: Receiver

    5D-6 Receiver Receiver Antenna Pin Diode Varactor Varactor Antenna Crystal RF Amp Mixer IF Amp Tuned Filter Tuned Filter Switch RF Jack Filter First LO from FGU Control Voltage from ASFIC Recovered Audio Demodulator Squelch U301 RSSI Synthesizer 16.8 MHz Reference Clock SPI Bus Second...

  • Page 169: Receiver Back-End

    Receiver 5D-7 The output of the post-RF amplifier filter which is connected to the passive double balanced mixer consists of T301, T302 and CR306. Matching of the filter to the mixer is provided by C381. After mixing with the first LO signal from the voltage controlled oscillator (VCO) using low side injection, the RF signal is down-converted to the 45.1 MHz IF signal.

  • Page 170: Automatic Gain Control Circuit

    5D-8 Receiver Automatic Gain Control Circuit (Refer to 330-400MHz Receiver Front End Schematic Diagram on page 5D-22) The front end automatic gain control circuit is to provide automatic gain reduction of the front end RF amplifier via feedback. This action is necessary to prevent overloading of back end circuits. This is achieved by drawing some of the output power from the RF amplifier’s output.

  • Page 171: Frequency Generation Circuitry

    Frequency Generation Circuitry 5D-9 Frequency Generation Circuitry Dual Tran- sistor Voltage Multiplier Rx Out Matching Pass Mixer Network Filter VCOBIC Aux3 Rx VCO Circuit Vmult1 U241 Aux4 Synthesizer Vmult2 U201 Loop Filter Tx Out Attenuator PA Driver 16.8 MHz Ref. Osc. MOD Out Tx VCO Circuit Modulating...

  • Page 172: Synthesizer

    5D-10 Frequency Generation Circuitry Synthesizer (Refer to 330-400MHz Synthesizer Schematic Diagram on page 5D-24) The Fractional-N Synthesizer uses a 16.8MHz crystal (FL201) to provide a reference for the system. The LVFractN IC (U201) further divides this to 2.1MHz, 2.225MHz, and 2.4MHz as reference frequencies.

  • Page 173: Vco - Voltage Controlled Oscillator

    Frequency Generation Circuitry 5D-11 VCO - Voltage Controlled Oscillator (Refer to 330-400MHz Voltage Controlled Oscillator Schematic Diagram on page 5D-25) AUX3 (U201 Pin2) Level Shifter AUX4 (U201 Pin3) Network U201 Pin 32 Prescaler Out TRB_IN Pin 20 Pin 19 Pin 12 Pin7 Rx-SW TX/RX/BS...
  • Page 174 5D-12 Frequency Generation Circuitry The VCOBIC(U241) is operated at 4.54 V (VSF) and Fractional-N synthesizer (U201) at 3.3V. This difference in operating voltage requires a level shifter consisting of Q260 and Q261 on the TRB line. The operation logic is shown in Table 5-1. Table 5-1: Level Shifter Logic Desired AUX 4...

  • Page 175: Notes For All Schematics And Circuit Boards

    1. Unless otherwise stated, resistances are in Ohms (k = 1000), and capacitances are in picofarads (pF) or microfarads (µF). 2. DC voltages are measured from point indicated to chassis ground using a Motorola DC multime- ter or equivalent. Transmitter measurements should be made with a 1.2 µH choke in series with the voltage probe to prevent circuit loading.
  • Page 176 5D-14 Notes For All Schematics and Circuit Boards THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 177: Circuit Board/Schematic Diagrams And Parts List

    Circuit Board/Schematic Diagrams and Parts List 5D-15 Circuit Board/Schematic Diagrams and Parts List PB502 PB501 PB504 VR444 R300 R352 C397 SH321 RT301 R314 R321 VR501 C362 C328 C363 C325 R335 R338 TP201 L325 J200 R506 R325 C385 C351 C353 SH201 C384 C352 R206...

  • Page 178: 330-400Mhz Main Board Bottom Side Pcb No. 8404101G02/G03/G04

    5D-16 Circuit Board/Schematic Diagrams and Parts List M301 M101 C523 C522 L505 C525 SH322 C526 C527 C528 VR506 L330 C529 C359 C530 C277 C531 C338 S502 C532 C533 C358 C534 C357 C535 R350 C536 C344 C537 C390 C278 R344 C538 U248 C539 C383...

  • Page 179: 330-400Mhz Main Board Top Side Pcb No. 8404101G06

    Circuit Board/Schematic Diagrams and Parts List 5D-17 PB502 PB501 PB504 C505 VR440 VR444 C521 R300 R352 C397 FL201 R507 R314 R321 CR310 RT301 C363 C328 C325 C362 VR501 R335 L332 C216 R338 SH323 J200 TP201 R506 L325 R325 C385 C351 C353 SH201 C352...

  • Page 180: 330-400Mhz Main Board Bottom Side Pcb No. 8404101G06

    5D-18 Circuit Board/Schematic Diagrams and Parts List C522 C525 L505 C526 VR441 C527 C528 L330 VR506 C359 C529 C530 S502 C277 C531 C338 C532 C358 C533 B501 Y201 C357 C534 C535 C344 C536 R350 C390 C278 C537 R344 U248 C538 C383 C539 C360...
  • Page 181 Circuit Board/Schematic Diagrams and Parts List 5D-19 C538 C537 C536 C535 C534 C533 C532 C531 C527 C526 C525 C530 C529 C528 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF 100pF J200 J200-1 J200-2 J200-3 J200-4 J200-5 J200-6 EMER...
  • Page 182 5D-20 Circuit Board/Schematic Diagrams and Parts List RADIO_CODE B501 L505 UNSWB+ BATTERY_CONTACT 390nH BATT_CODE DATA BATT+ F501 CONN_J S502 BATT- MECH_SWB+ SWITCH LI_ION B503 TAB2 VR506 B504 C502 CR501 VR439 C503 0.47uF TAB1 6.8V 100pF R507 C505 6.8V VR501 100pF Vdda PB501 SWITCH...

  • Page 183: 330-400Mhz Controls And Switches Schematic Diagram (Sheet 2 Of 2 For 8404101G06 Pcb)

    Circuit Board/Schematic Diagrams and Parts List 5D-21 RADIO_CODE B501 L505 UNSWB+ BATTERY_CONTACT 390nH BATT_CODE DATA BATT+ F501 CONN_J S502 BATT- MECH_SWB+ SWITCH LI_ION B503 VR439 CR501 TAB2 B504 C502 VR506 C503 0.47uF TAB1 6.8V 100pF R507 C505 6.8V VR501 100pF Vdda PB501 SWITCH...

  • Page 184: 330-400Mhz Receiver Front End Schematic Diagram

    5D-22 Circuit Board/Schematic Diagrams and Parts List DACRx C322 82pF R342 -59.5dBm@45.1MHz 100K L310 150nH C315 R310 R308 R305 C314 100pF 0.1uF R304 R309 C380 .01uF -52.5dBm@330.225MHz C321 CR306 L304 100pF C306 -53.5dBm@399.725MHz T301 180nH XFMR C309 C308 100pF R306 R307 100pF 2.285V...

  • Page 185: 330-400Mhz Receiver Back End Schematic Diagram

    Circuit Board/Schematic Diagrams and Parts List 5D-23 L331 R343 2.20uH Vdd_FILTERED Vdda C382 (SOURCE) 10uF DEMOD R350 C348 C347 C345 C344 C346 100K 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF C390 C329 100pF 0.1uF C343 0.22uF R344 R345 R355 2.628V 3.185V Q320 C342 C357 C384...

  • Page 186: 330-400Mhz Synthesizer Schematic Diagram

    5D-24 Circuit Board/Schematic Diagrams and Parts List U210 C257 U211 TC7ST04FU 100pF C296 C265 TC7ST04FU 0.1uF C258 7.5V .01uF 1.65V U247 ADP3300 C259 SWB+ .01uF CR201 (SOURCE) C294 C293 C291 100pF 10uF 0.47uF 3 K3 A3 4 L202 4V_3.3V A2 5 U248 2 K2 2.2uH...

  • Page 187: 330-400Mhz Voltage Controlled Oscillator Schematic Diagram

    Circuit Board/Schematic Diagrams and Parts List 5D-25 C281 R245 100pF R242 C250 L243 C276 C285 C286 7.5pF 4.6V 2.2uF 0.1uF 100pF RESONATOR C246 R241 L281 L273 100pF 390nH 39nH C242 7.5pF C272 C273 0.1uF C243 L242 L271 R244 6.8pF 390nH 56nH RX_INJ C245...

  • Page 188: 330-400Mhz Transmitter Schematic Diagram

    5D-26 Circuit Board/Schematic Diagrams and Parts List E101 BEAD R102 UNSWB+ L107 C114 C123 C108 33.47nH 100pF 10uF 100pF L105 390nH C172 UNSWB+ 0.1uF R106 C109 L106 100pF 7.66nH Microstrip Microstrip R172 L108 L109 C121 C160 L112 4.22nH 11.03nH 100pF 390nH 56pF Q110...

  • Page 189: 330-400Mhz Radio Parts List (Rf Board)

    C338 2113743N30 15pF B503 3980502Z01 Backup Battery Contact, B+ C174 2113743L05 100pF C273 2113743M24 0.1uF C339 2180478Z20 1.0uF (not used in GP328 Plus) C180 2113743N26 10pF C276 2104993J02 2.2uF C340 2180478Z20 1.0uF B504 3980501Z01 Backup Battery Contact, B- C188 2113743N50...
  • Page 190 5D-28 Circuit Board/Schematic Diagrams and Parts List Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C521 2113743L41 0.01uF FL201 **4805875Z04 16.8MHZ Xtal L340 2462587V41 390nH R176 0662057B59 3 ohm...
  • Page 191 RF PCB R344 0662057N01 8404101G03 RF PCB R345 0662057M98 8404101G04 RF PCB R346 0662057N17 8404101G06 RF PCB R347 0662057M74 * Motorola Depot Servicing only R348 0662057M87 3.6K ** Not Serviceable R349 0662057C01 R350 0662057N23 100K R351 0662057C01 R352 0662057M86 3.3K...
  • Page 192 5D-30 Circuit Board/Schematic Diagrams and Parts List THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 193: Troubleshooting Charts

    Troubleshooting charts 5D-31 Troubleshooting charts MCU Check Press PTT. Red LED does not Before replacing light up Not able to pro- MCU, check SPI Power Up Audio at AUDIO gram RF Board Alert Tone clock, SPI data, and AudioPA J403 Audio RF IC select (U420) at Pin 2 &...

  • Page 194: Troubleshooting Flow Chart For Receiver (Sheet 1

    5D-32 Troubleshooting charts START Bad SINAD Bad 20dB Quieting No Recovered Audio Audio at pin 27 Check Controller of U301? Spray of inject 1st IF into XTAL Filter IF Freq: 45.1MHz Check Q320 bias cir- cuitry for faults. Audio heard? Rotate Freq.
  • Page 195 Troubleshooting charts 5D-33 Inject RF into J101 Trace IF signal Q302 collector from L311 to IF Signal at Q302. Check for L311? IF signal bad XTAL filter. present? Before replacing U301, check U301 voltages; 1st LO O/P trace IF signal RF Signal at Check FGU path.

  • Page 196: Troubleshooting Flow Chart For Transmitter

    5D-34 Troubleshooting charts START No Power Is There B+ Check Q111 Bias for Ant switch Is Control Voltage Check PCIC Is Current High or Low High Check Drive to Module 1. Check Pin Diodes 2. Check Harmonic Filter Is Drive Troubleshoot Inspect/Repair Tx.

  • Page 197: Troubleshooting Flow Chart For Synthesizer

    Troubleshooting charts 5D-35 Check U248, 3.3V at U201 Start L201 & L202 pins 5, 20, 34 & Visual Check CR201, U210, Correct check of the U211, C258, C259 & Problem Board OK? C228 Is U201 Pin 47 Is 16.8MHz 16.8MHz at pin 6 of Replace AT = 13 VDC...

  • Page 198: Troubleshooting Flow Chart For Vco

    5D-36 Troubleshooting charts START Change U241 No LO? Change L253 O/C? L253 Pin 10 TRB = 5V? Tx Carrier? >1V? VCO OK Check R245 for dry joint or faulty AUX 3 Check High? R260 Check U201 Pin 2 for 3.2V Change L243 V ctrl 0V...

  • Page 199: Flex Layout/Schematic Diagrams And Parts Lists

    Section 6 FLEX LAYOUT/SCHEMATIC DIAGRAMS AND PARTS LISTS RF-Controller Interconnect Flex Rev A <- TO CTRL Front Metal View From Top Side TO RF -> 8480475Z02 REV A J400 J200 Rev B <- TO CTRL Front Metal View From Top Side TO RF ->...

  • Page 200: Schematic For Rf-Controller Interconnect Flex

    Schematic for RF-Controller Interconnect Flex Schematic for RF-Controller Interconnect Flex CONTROLLER RF BOARD J400 J200 EXT_MIC EXT_MIC VS_CS VS_CS SW_B+ SW_B+ Vddd Vddd VS_AUDSEL VS_AUDSEL Det_Aud_Snd Det_Aud_Snd Rx_Aud_Rtn Rx_Aud_Rtn Tx_Aud_Snd Tx_Aud_Snd Tx_Aud_Rtn Tx_Aud_Rtn Flat_Tx_Rtn Flat_Tx_Rtn Opt_Bd_En Opt_Bd_En Rdy/Req Rdy/Req Rx_Aud_Snd Rx_Aud_Snd INT_EXT_Vdd INT_EXT_Vdd...

  • Page 201: Universal Connector Flex

    Universal Connector Flex Universal Connector Flex GP328 Plus M400 M401 C402 P403 Front Metal Back Metal View From Front Side View From Back Side...

  • Page 202: Gp338 Plus/Gp338 Xls

    Universal Connector Flex GP338 Plus/GP338 XLS J416 J415 J414 J413 J412 M401 J411 J410 J409 J408 J407 J406 J405 J404 P403 Front Metal Back Metal View From Front Side View From Back Side...

  • Page 203: Schematic For Universal Connector Flex

    Schematic for Universal Connector Flex Schematic for Universal Connector Flex GP328 Plus M400 SPKR_20 J403 20 PIN CONN SPKR_20 INT_SPK+ 13 PIN UNIVERSAL CONN INT_SPK- SPKR_20 EXT_SPKR+ J404 EXT_SPKR+ SPKR_20 EXT_SPK- J405 EXT_SPK- OPT_B+30 DPT_B+ J406 OPT_B+ EXT_MIC EXT_MIC J407...

  • Page 204: Parts List For Universal Connector Flex

    Parts List for Universal Connector Flex Parts List for Universal Connector Flex GP328 Plus Reference Motorola Description Symbol Part No. C402 2113740A55 Cap, 100pF M400 5005679X01 Speaker, 24 ohm M401 5013920A04 Mic, Mini electrec GP338 Plus/GP338 XLS Reference Motorola Description Symbol Part No.
  • Page 205 Service Manuals need to be updated accordingly. If you wish to be informed of these updates, kindly fill in and fax us your details. Fax to: 6-04-6124944 The Technical Publications Coordinator, Media and Communications, R&D Department, Motorola Penang. Your Details Name/Contact Person: Company Name: Address: Telephone No.: Fax No.:...
  • Page 206 Kindly take a few moments to provide feedback on this manual. Thank you for your cooperation. Fax to: 6-04-6124944 The Technical Publications Coordinator, Media and Communications, R&D Department, Motorola Penang. 1. Please check all the appropriate boxes: Disassembly Pro- cedures Alignment...

This manual is also suitable for:

Gp338 plusGp338 xls

Table of Contents