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Standard Horizon HX370S Service Manual

Vhf/fm marine handheld transceiver
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Download this manual See also: Service Manual, Owner's Manual
VHF/FM Marine Handheld Transceiver
HX370S
SERVICE MANUAL
EM008N90A
1

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Summary of Contents for Standard Horizon HX370S

  • Page 1 VHF/FM Marine Handheld Transceiver HX370S SERVICE MANUAL EM008N90A...

  • Page 2: Specifications

    Specifications General Frequency range: 156 MHz - 163.275 MHz (Marine Band + WX Band) Channel Steps: 25 kHz 137 MHz - 174 MHz (LMR) Channel Steps: 12.5 / 25 kHz Frequency stability: ± 2.5 ppm (–22 °F to +140 °F [–30 °C to +60 °C]) Emission type: 16K0G3E, 16K0F3E, 8K50F3E Antenna impedance:...

  • Page 3: Exploded View & Miscellaneous Parts

    Exploded View & Miscellaneous Parts RA0588600 WINDOW RA0401600 O RING RA058850A DOUBLE FACE TAPE RA0577200 LIGHT GUIDE RA0588300 FRONT CASE ASSY RA0588400 FRONT CASE RA0478500 RA0577100 SPECIAL NUT ASSY HOLDER RA0578400 RA057700A RING NUT RUBBER KNOB RA0467600 O RING RA0588800 VOLUME KNOB RA0588900 RA0577900...
  • Page 4 Exploded View & Miscellaneous Parts Note...
  • Page 5 Block Diagram...
  • Page 6 Connection Diagram...

  • Page 7: Circuit Description

    Circuit Description 1. Receive Signal Path 3. Squelch Control Incoming RF from the antenna jack is delivered to the RF The squelch circuitry consists of a noise amplifier and Unit and passes through a low-pass filter consisting of band-pass filter and noise detector within Q1039 coils L1023, L1026, and L1027, capacitors C1227, C1273, (NJM2591V) When no carrier received, noise at the out- C1276, C1270, C1257, and C1256, and antenna switching...
  • Page 8 Circuit Description If a CDCSS code is enabled for transmission, the code is The data latch section of Q1017 (MB15A01PFV1) also re- generated by microprocessor Q1066 (HD64F2266) and de- ceives serial dividing data from the microprocessor Q1066 livered to X1001 (21.25 MHz) for CDCSS modulating. (HD64F2266), which causes the pre-divided VCO signal to be further divided in the programmable divider sec- The modulated signal from the VCO Q1012 (2SC5231) is...
  • Page 9 Alignment The HX370S has been carefully aligned at the factory for Required Test Equipment the specified performance across the land mobile band. RF Signal Generator with calibrated output level at 200 MHz Realignment should therefore not be necessary except in Deviation Meter (linear detector) the event of a component failure.
  • Page 10 Alignment Before Alignment Squelch Threshold and Tight Squelch Adjustment Press and hold in the [ ] key and [ MEM ] key while Set up the test equipment as shown below for Receiver turning the transceiver on to enter the Alignment Section Alignment.
  • Page 11 Alignment Transmitter Power Output Transmitter Modulation Press the [ ] key to set the display to “ Set up the test equipment as shown below for PLL .“ The trans- and Ttransmitter Section Alignment. Maintain the sup- ceiver now is in the Transmitter Modulation Align- ply voltage at 8.4V DC for all steps.
  • Page 12 Alignment Note...
  • Page 13 MAIN Unit Circuit Diagram 4.5 V RX: 8.40 V RX: 0 V TX: 8.20 V TX: 2.80 V 3.50 V RX: 0 V TX: 4.60 V 0.67 V 4.30 V RX: 2.90 V RX: 0 V RX: 0 V TX: 2.86 V TX: 3.65 V TX: 1.10 V RX: 0.60 V...
  • Page 14 MAIN Unit Note...
  • Page 15 MAIN Unit Parts Layout (Side A) HD64F2266 (Q1024) AT24C128N (Q1067) LM2904PWR (Q1062, 1079) CD4094BPWR (Q1053) M62364FP (Q1033) 2SA1774 (FR) 2SC4617 (BR) RD07MVS1 BD4845FVE DTA114TE (94) DTC143ZE (E23) S-812C30AMC UMD2N (D2) DA221 (K) 1SS321 (F9) (Q1022) (Q1004, 1021, (Q1045) (Q1023) (Q1003) (Q1005) (Q1008) (Q1009)
  • Page 16 MAIN Unit Parts Layout (Side B) LM2904PWR LM2902PWR 2SA1774 (FR) 2SC4400 (RT4) 2SJ347 (KS) 2SK3074 (WA) DTA114TE (94) DTA143XE (33) DTA144EE (16) DTC144EE (26) UMW1 (W1) DA221 (K) DAN222 (N) (Q1075, 1078) (Q1074, 1076) (Q1007, 1025, (Q1046) (Q1011) (Q1036) (Q1002) (Q1029) (Q1006) (Q1041, 1050,...

  • Page 17: Main Unit

    MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR PCB with Components CB2717001 DST USA, IS OFF CB2717002 DST EXP, IS OFF CB2717003 DST EXP, IS ON CB2717005 DST USA, IS ON Printed Circuit Board AM008N000 FR0114100 C 1001...
  • Page 18 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR C 1072 CHIP CAP. 0.001uF GRM36B102K50PT K22178809 C 1074 CHIP CAP. 0.001uF GRM36B102K50PT K22178809 C 1075 CHIP CAP. 820pF GRM36B821K50PT K22178808 C 1076 CHIP CAP. 0.001uF GRM36B102K50PT K22178809...
  • Page 19 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR C 1153 CHIP CAP. 33pF GRM36CH330J50PT K22178224 C 1154 CHIP CAP. 0.001uF GRM36B102K50PT K22178809 C 1155 CHIP CAP. 0.047uF GRM36B473K10PT K22108801 C 1156 CHIP CAP. 47pF UMK105CH470JW-F K22178274...
  • Page 20 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR C 1241 CHIP CAP. 0.001uF GRM36B102K50PT K22178809 C 1242 CHIP CAP. 56pF UMK105CH560JW-F K22178276 C 1243 CHIP CAP. 0.001uF GRM36B102K50PT K22178809 C 1244 CHIP CAP. 15pF UMK105CH150JW-F K22178262...
  • Page 21 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR D 1018 19-215UYOC/S530-A2/TR8 G2070884 D 1019 19-215UYOC/S530-A2/TR8 G2070884 D 1020 DIODE 1SS400 TE61 G2070634 D 1021 CL-191WB-D(TAPE) G2070952 D 1022 19-215UYOC/S530-A2/TR8 G2070884 D 1023 19-215UYOC/S530-A2/TR8 G2070884 D 1026...
  • Page 22 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR Q 1004 TRANSISTOR 2SC4617 TL R G3346178R Q 1005 TRANSISTOR DTC143ZE TL G3070102 Q 1006 TRANSISTOR DTA144EE TL G3070074 Q 1007 TRANSISTOR 2SA1774 TL R G3117748R Q 1008 S-812C30AMC-C2K-T2...
  • Page 23 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR R 1011 CHIP RES. 390k 1/16W RMC1/16S 394JTH J24189056 R 1012 CHIP RES. 1/16W RMC1/16S 103JTH J24189037 R 1013 CHIP RES. 4.7k 1/16W RMC1/16S 472JTH J24189033 R 1014 CHIP RES.
  • Page 24 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR R 1086 CHIP RES. 470k 1/16W RMC1/16S 474JTH J24189057 R 1087 CHIP RES. 100k 1/16W 0.5% MCR01MZPD1003 J24189386 R 1088 CHIP RES. 100k 1/16W 0.5% MCR01MZPD1003 J24189386...
  • Page 25 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR R 1174 CHIP RES. 4.7k 1/16W RMC1/16S 472JTH J24189033 R 1175 CHIP RES. 1/16W RMC1/16S 470JTH J24189009 R 1176 CHIP RES. 1/16W RMC1/16S 102JTH J24189025 R 1177 CHIP RES.
  • Page 26 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR R 1259 CHIP RES. 1/16W RMC1/16S 473JTH J24189045 R 1260 CHIP RES. 1/16W RMC1/16S 102JTH J24189025 R 1261 CHIP RES. 1/16W RMC1/16S 102JTH J24189025 R 1262 CHIP RES.
  • Page 27 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR R 1342 CHIP RES. 4.7k 1/16W RMC1/16S 472JTH J24189033 R 1343 CHIP RES. 1/16W RMC1/16S 103JTH J24189037 R 1344 CHIP RES. 2.2k 1/16W RMC1/16S 222JTH J24189029 R 1345 CHIP RES.
  • Page 28 MAIN Unit Note...
  • Page 30 © 2004 VERTEX STANDARD CO., LTD. All rights reserved. Marine Division of VERTEX STANDARD No portion of this manual US Headquarters may be reproduced 10900 Walker Street, Cypress, CA 90630, U.S.A. without the permission of VERTEX STANDARD CO., LTD.