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UHF FM TRANSCEIVER
FT-1907R
Technical Supplement
©2010 VERTEX STANDARD CO., LTD.
Introduction
This manual provides technical information necessary for servicing the FT-1907R UHF FM Transceiver.
Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non-
qualified persons to service this equipment may result in permanent damage not covered by the warranty,
and may be illegal in some countries.
Two 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 ("leaded" or "chip-only"). In
most cases one side has only chip components, and the other has either a mixture of both chip and leaded
components (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only.
While we believe the technical information in this manual to be correct, VERTEX STANDARD assumes no
liability 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.
The transceiver was assembled using Pb (lead) free solder, based on the RoHS specification.
Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on this appara-
tus. The solder stated above utilizes the alloy composition required for compliance with the lead-free specification,
and any solder with the above alloy composition may be used.
Specifications ...................................................... 2
Exploded View & Miscellaneous Parts ............ 3
Block Diagram .................................................... 5
Connection Diagram .......................................... 6
Circuit Description ............................................. 7
Alignment ............................................................ 9
VERTEX STANDARD CO., LTD.
4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan
VERTEX STANDARD
US Headquarters
10900 Walker Street, Cypress, CA 90630, U.S.A.
YAESU UK LTD.
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
VERTEX STANDARD HK LTD.
Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road,
Kwun Tong, Kowloon, Hong Kong
VERTEX STANDARD AUSTRALIA PTY., LTD.
Normanby Business Park, Unit 14/45 Normanby Road
EH023U91A
Notting Hill 3168, Victoria, Australia
Important Note
Board Unit
MAIN Unit Circuit Diagram ................................. 13
MAIN Unit Parts Layout ...................................... 15
MAIN Unit Parts List ............................................ 17
CNTL Unit Circuit Diagram .................................. 29
CNTL Parts Layout ............................................... 30
CNTL Parts List .................................................... 31
(Schematics, Layouts & Parts)
1
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Summary of Contents for Yaesu FT-1907R
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Page 1: Table Of Contents
Notting Hill 3168, Victoria, Australia Introduction This manual provides technical information necessary for servicing the FT-1907R UHF FM Transceiver. Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non- qualified persons to service this equipment may result in permanent damage not covered by the warranty, and may be illegal in some countries. -
Page 2: Specifications
Specifications General Frequency Range: 400 - 470 MHz Channel Step: 5/10/12.5/15/20/25/50/100 kHz Standard Repeater Shift: ±7.6 MHz Frequency Stability: Better than ±5 ppm (–10 °C to +60 °C) Modes of Emission: F2/F2D/F3E Antenna Impedance: 50 Ohms, unbalanced Supply voltage: 13.8 V DC ±15%, negative ground Current Consumption (typical): Rx: less than 0.7 A, less than 0.3 A (squelched) Tx: 11 A (55 W) /7 A (25 W) /5 A (10 W) /4 A (5 W) Operating Temperature Range: –20°... -
Page 3: Exploded View & Miscellaneous Parts
Exploded View & Miscellaneous Parts CP8579001 CASE ASSY w/SP NET: S8002087 M4090178 SPEAKER S8002118 (2 pcs) T9206438A CUSHION WIRE ASSY S8002063 CAP-SP ACCESSORIES VXSTD P/N DESCRIPTION MICROPHONE ( MH-48 AAA43X001 G1094556 T9021715 DC Power Cord w/Fuse T9207482 RA60H4047M1-101 SPARE FUSE ( 15 A ) WIRE ASSY Q0000081 BRACKET ( MMB-36 ) - Page 4 Note...
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Page 5: Block Diagram
Block Diagram... -
Page 6: Connection Diagram
Connection Diagram... -
Page 7: Circuit Description
Circuit Description Receive Signal Path & C1122, to the audio mute gate Q1034 (2SJ364). Incoming RF signal is from the antenna jack is de- The audio signal passes through a band-pass filter livered to the Main Unit and passed through the consisting of Q1046 and Q1047 (both 2SC4154), low-pass filter network consisting capacitors C1213, and the audio mute gate Q1039 (2SJ347), to the... -
Page 8: Tx Apc Circuit
Circuit Description TX APC Circuit A portion of the power amplifier module output is A portion of the output from the VCO Q1009 rectified by D1022 (1SS321), then delivered to APC (2SC5374) passes through the buffer amplifier Q1038 (LM2904PWR), as a DC voltage which is pro- Q1010 and Q1017 (both 2SC5374), then delivered portional to the output level of the power amplifier to the programmable divider section of the PLL IC... -
Page 9: Required Test Equipment
Alignment Introduction Required Test Equipment The FT-1907R is carefully aligned at the factory for The following test equipment (and familiarity with the specified performance across the amateur band. its use) is necessary for complete realignment. Cor- Realignment should therefore not be necessary ex- rection of problems caused by misalignment result- cept in the event of a component failure. -
Page 10: Alignment Preparation & Precautions
Rotate the DIAL knob to set the alignment pa- Entering the Alignment Mode rameter to “B4511 tL.” Alignment of the FT-1907R is performed using a Press the [ D/MR ( MW )] key to enable adjustment front panel software-based procedure. To perform of the “Squelch Threshold Level.”... -
Page 11: Tx Power (High)
Alignment S-meter Level (S-1) TX Power (Low 2) Inject a 435.100 MHz signal at a level of –5 dBµ Rotate the DIAL knob to set the alignment pa- (with 1 kHz modulation @±3.5 kHz deviation) rameter to “B4501 L2.” Press the [ D/MR ( MW )] key to enable adjustment from the RF signal generator. -
Page 12: Dcs Tx Deviation
Alignment Closing the Alignment mode DCS TX Deviation Rotate the DIAL knob to set the alignment pa- 1. Press the [DW(REV)] key to save the new setting and rameter to “B4501 dC.” exit to normal operation. 2. Press and hold in the [ PWR ( )] switch for 1/2 sec- Press the [ D/MR ( MW )] key to enable adjustment ond to turn the radio off. -
Page 13: Main Unit Circuit Diagram
MAIN Unit Circuit Diagram (4.0 V) 3.4 V (3.4 V) (1.6 V) 3.5 V (3.5 V) (0 V) 0.6 V (0.7 V) 5.5 V (6.4 V) (0.6 V) (5.5 V) (0 V) (0.9 V) 1.7 V (6.4 V) 1.5 V 6.3 V (1.7 V) (1.5 V) - Page 14 MAIN Unit Note...
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Page 15: Main Unit Parts Layout
MAIN Unit Parts Layout (Side A) RA55H4047M KIA7808API LA4425A (Q1030) (Q1015) (Q1035) 2SA1774 (FR) 2SJ562 2SC4154 (E) (Q1007) (Q1008) (Q1033) 2SC4400 (RT4) (Q1032) 2SC4617 (BR) (Q1051, 1053) 2SC5226 (R22) (Q1026) 2SC4915O (Q0) CD4094BPWR 3SK296ZQ (ZQ) (Q1054) (Q1048) (Q1037, 1045) 2SC5374 (NA) MB15A01PFV1 (Q1009, 1010, 1017, (Q1011) - Page 16 MAIN Unit Parts Layout (Side B) LM2902PWR M62364FP LM2904PWR (Q1005, 1049) (Q1043) (Q1038, 1044, 1050) 2SA1774 (FR) 2SJ347 (KS) 2SJ364 (4M) (Q1024, 2027, 1029) (Q1039) (Q1034, 1036, 1041, 1042) 2SC4154 (E) DTC144EE (26) S-812C50AUA (Q1001, 1021, 1046, (Q1013, 1020, 1022, (Q1016) 1047) 1031, 1040)
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Page 17: Main Unit Parts List
MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR PCB with Components CB3539005 CE:OFF, DST:EXP2 Printed Circuit Board AH023N000 FR014760E C 1001 CHIP TA.CAP. 10uF TAJA106M010Y K78100072 C 1001 CHIP TA.CAP. 10uF F931A106MAA K78100078 40- B C 1002... - Page 18 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR C 1052 CHIP CAP. 0.022uF GRM39B223K25PT K22144807 C 1052 CHIP CAP. 0.022uF GRM188B11H223KA01D K22174839 13- B C 1053 CHIP CAP. 0.015uF GRM39B153K25PT K22144805 C 1053 CHIP CAP.
- Page 19 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR C 1106 CHIP CAP. 0.001uF GRM188B11H102KA01D K22174821 15- A C 1107 CHIP CAP. 0.001uF GRM188B11H102KA01D K22174809 C 1107 CHIP CAP. 0.001uF GRM188B11H102KA01D K22174821 15- A C 1109 CHIP CAP.
- Page 20 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR C 1154 CHIP CAP. 0.001uF GRM188B11H102KA01D K22174809 C 1154 CHIP CAP. 0.001uF GRM188B11H102KA01D K22174821 15- A C 1155 CHIP CAP. 0.001uF GRM155B11H102KA01D K22178809 C 1156 CHIP CAP.
- Page 21 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR C 1209 CHIP CAP. 6.3V GRM188B10J105KA01D K22084801 C 1210 CHIP CAP. 3.9pF 500V 1206N3R9C501LT K22278204 C 1211 CHIP CAP. 2.2pF 500V 1206N2R2C501LT K22278201 C 1212 CHIP CAP.
- Page 22 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR C 1276 CHIP CAP. 6.3V GRM188B10J105KA01D K22084801 C 1277 CHIP CAP. 0.0022uF GRM188B11H222KA01D K22174813 C 1278 CHIP CAP. 0.0056uF GRM188B11H562KA01D K22174818 C 1279 CHIP CAP. 0.1uF GRM188B11C104KA01D K22124805...
- Page 23 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR L 1012 CHIP COIL 0.012uH LQW18AN12NG00D L1690881 L 1013 COIL 0.0068uH AS100240-6R8N L0022656 L 1014 COIL 0.015uH AS0803-15NK L0022536 L 1015 CHIP COIL 0.012uH LQW18AN12NG00D L1690881 L 1016...
- Page 24 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR R 1004 CHIP RES. 1/16W RMC1/16S 101JTH J24189013 R 1005 CHIP RES. 1/16W RMC1/16S 223JTH J24189041 R 1006 CHIP RES. 1/16W RMC1/16S JPTH J24189070 R 1007 CHIP RES.
- Page 25 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR R 1082 CHIP RES. 4.7k 1/16W RMC1/16S 472JTH J24189033 R 1083 CHIP RES. 2.2k 1/16W RMC1/16S 222JTH J24189029 R 1084 CHIP RES. 1/16W RMC1/16S 473JTH J24189045 R 1085 CHIP RES.
- Page 26 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR R 1160 CHIP RES. 1/16W RMC1/16S 153JTH J24189039 R 1161 CHIP RES. 100k 1/16W RMC1/16S 104JTH J24189049 R 1162 CHIP RES. 2.2M 1/16W RMC1/16S 225JTH J24189065 R 1163 CHIP RES.
- Page 27 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR R 1243 CHIP RES. 1/16W RMC1/16S 223JTH J24189041 R 1244 CHIP RES. 150k 1/16W RMC1/16S 154JTH J24189051 R 1245 CHIP RES. 100k 1/16W RMC1/16S 104JTH J24189049 R 1246 CHIP RES.
- Page 28 MAIN Unit Note...
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Page 29: Cntl Unit Circuit Diagram
CNTL Unit Circuit Diagram 2.3 V (2.3 V) 2.3 V (2.3 V) (0 V) (0 V) 2.6 V (0 V) (2.6 V) (0 V) 5.0 V (5.0 V) (0 V) (0 V) 5.0 V (5.0 V) 4.8 V (0.6 V) 2.6 V 5.0 V (2.6 V) -
Page 30: Cntl Parts Layout
CNTL Unit Parts Layout CPH6202 (CB) DTC143ZE (E23) (Q2005) (Q2004) (Side A) HD64F2266TF13 BR24L64 (Q2002) (Q2006) 2SC4617 (BR) BD4830FVE (Q2007, 2008, 2013) (Q2011) 2SC5374 (NA) (Q2003) (Side B) S-812C50AUA (Q2010) DA221 (26) DAN222 (N) (D2001, 2025) (D2023) -
Page 31: Cntl Parts List
CNTL Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR PCB with Components CB3540006 CE:OFF, TYP:B3 Printed Circuit Board FR014770C C 2001 CHIP CAP. 0.001uF GRM155B11H102KA01D K22178809 C 2002 CHIP CAP. 0.001uF GRM155B11H102KA01D K22178809 C 2003 CHIP CAP. - Page 32 CNTL Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR C 2056 AL.ELECTRO.CAP. 100uF UWX1C101MCL1GB K48120032 C 2057 CHIP CAP. 0.1uF GRM155B11A104KA01D K22108802 C 2058 CHIP CAP. 0.1uF GRM155B11A104KA01D K22108802 C 2059 CHIP CAP. 0.1uF GRM188B11C104KA01D K22124805...
- Page 33 CNTL Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT … LAY ADR R 2021 CHIP RES. 1/16W RMC1/16S 223JTH J24189041 R 2022 CHIP RES. 100k 1/16W RMC1/16S 104JTH J24189049 R 2023 CHIP RES. 1/16W RMC1/16S 102JTH J24189025 R 2024 CHIP RES.
- Page 34 CNTL Unit Note...
- Page 36 Copyright 2010 VERTEX STANDARD CO., LTD. All rights reserved No portion of this manual may be reproduced without the permission of VERTEX STANDARD CO., LTD. Printed in Japan.
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