Vertex Standard VX-900 Service Manual

Uhf band

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VX-900

UHF Band

Service Manual

Operating Manual Reprint ................................................................................................................................................ 2

Set (Menu) Mode Functions ............................................................................................................................................ 10

Cloning ................................................................................................................................................................................ 12

Specification ....................................................................................................................................................................... 13

Exploded Views & Miscellaneous Parts ....................................................................................................................... 14

Block Diagram ................................................................................................................................................................... 15

Circuit Description ........................................................................................................................................................... 17

Alignment ........................................................................................................................................................................... 20

Test Adapter Schematic ................................................................................................................................................... 25

Board Units (Schematics, Layouts & Parts)

MAIN Unit ...................................................................................................................................................................... 27

VR Unit ............................................................................................................................................................................ 55

SW Unit ........................................................................................................................................................................... 56

Dummy Unit .................................................................................................................................................................. 57

Optional Board Units (Schematics, Layouts & Parts)

F2D-8 2-Tone Decode Unit ........................................................................................................................................... 58

VTP-50 VX-Trunk Unit ................................................................................................................................................. 60

FVP-25 Encryption / DTMF Pager Unit ...................................................................................................................... 62

F5D-14 5-Tone Unit ....................................................................................................................................................... 64

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.

International Division

8350 N.W. 52nd Terrace, Suite 201, Miami, FL 33166, U.S.A.

YAESU EUROPE B.V.

P.O. Box 75525, 1118 ZN Schiphol, The Netherlands

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

Introduction

This manual describes the circuit theory, program-

ming procedures, and alignment procedures for the

VX-900 UHF Portable Transceiver.

Much of the operating flexibility of the VX-900 is

derived from its versatile "Soft Key" front panel keys.

These keys may be configured for a number of op-

erating functions, as described in this manual.

Following the discussion of transceiver operation,

details regarding programming software, align-

ment, and maintenance will follow.

Contents

Table of Contents

Summary of Contents for Vertex Standard VX-900

Page 1: Table Of Contents
This manual describes the circuit theory, program- ming procedures, and alignment procedures for the VX-900 UHF Portable Transceiver. Much of the operating flexibility of the VX-900 is derived from its versatile "Soft Key" front panel keys. These keys may be configured for a number of op- erating functions, as described in this manual.
Page 2: Operating Manual Reprint
Operating Manual Reprint CH ( Channel ) Selector Antenna Jack TOP SEL Key LCD ( Liquid Crystal Display ) SIDE SEL Key PTT Switch MONITOR Button LAMP Button 16-Button DTMF Keypad ( 16-key version only ) Low Transmit Power Mode On This Channel on “DUAL WATCH”...
Page 3 If you have a Speaker/Mi- crophone, we recommend that it not be connected until you are familiar with the basic operation of the VX-900. Operation Quick Start r Turn the top panel’s VOL/ PWR knob clockwise to turn on the radio on.
Page 4 Operating Manual Reprint TOR button twice) to quiet the noise and re- sume normal (quiet) monitoring. r To transmit, press and hold the PTT switch. Speak into the micro- phone area of the front panel grille (above the [ D ] key) in a normal voice level.
Page 5 Soft key and TOGGLE switch Functions The VX-900 includes the [ TOP SEL ] , [ SIDE SEL ] , [ MONITOR ] , and [ LAMP ] keys, and the TOGGLE switch, while the 16-key version additionally pro- vides [ A ] , [ B ] , [ C ] , [ D ] function keys. The Soft key...
Page 6 Operating Manual Reprint Description of Operating Functions Channel Scan The Scanning feature is used to monitor multiple sig- nals programmed into the transceiver. While scanning, the transceiver will check each channel for the pres- ence of a signal, and will stop on a channel if a signal is present.
Page 7 DVANCED PERATION Channel Group Selection The VX-900 is capable of separating its 512 memory channels into any of 20 Groups. There is no limit as to the number of channels which may be assigned to each Group. The Dealer will have made the Group assign- ment at the time of channel programming.
Page 8 Dealer. The DTMF tones sent during the dialing sequence will be heard in the speaker. Emergency The VX-900 includes an “Emergency” feature which may be useful if you have someone monitoring on the same frequency as your transceiver’s channel. For fur- ther details contact your nearest VERTEX STAN- DARD dealer.
Page 9 3 wire Mini Lapel Microphone Availability of accessories may vary; some accessories are supplied standard per local requirements, others may be unavailable in some regions. Check with your VERTEX STANDARD Dealer for changes to the this list. Operating Manual Reprint &...
Page 10: Set (Menu) Mode Functions
The VX-900 Soft Keys include the [TOP SEL], [SIDE SEL], [MON], and [LAMP] Keys, plus the [A], [B], [C], and [D] keys on the 16-key version. The Soft Key functions can be assigned either as a "Menu"...
Page 11 [SIDE SEL] key to select "P" (PTT Lock), "D" (Dial- Knob-Lock), "K" (Keypad Lock), or various combi- nations of these. Rotate the CH selector knob to save the new setting, then press the PTT switch to exit the Set (Menu) mode. No.7 GROUP (Group Select) This Menu item allows you to change Channel Groups, in the event that a Soft Key has not been...
Page 12: Cloning
Cloning The VX-900 includes a convenient “Clone” feature, which allows the programming data from one trans- ceiver to be transferred to another VX-900. Here is the procedure for Cloning one radio’s data to an- other. 1. Turn both transceivers off.
Page 13: Specification
ENERAL Number of Channels: Frequency Range: Channel Spacing: PLL Steps: Power Supply Voltage: Battery Life (5-5-90 duty): Temperature Range: Frequency Stability: Case Size: Weight (approx.): Battery: ECEIVER Circuit Type: Sensitivity: Adjacent Channel Selectivity: Intermodulation: Spurious and Image Rejection: Hum & Noise: AF Output: RANSMITTER Power Output:...
Page 14: Exploded Views & Miscellaneous Parts
Exploded View & Miscellaneous Parts RA0297600 EXT CAP Ç Ç RA030720A (Lot. 2~) RA0307200 (Lot. 1~) KNOB RA0317300 RA030770B (Lot. 4~) LIGHT SHEET B RA030770A (Lot. 1~) KNOB RA0296900 RA0317000 HOLDER PLATE SHEET (SP) RA0296600 RA0207800 BRACKET MIC HOLDER* RA0298200 INTER CONNECTOR Ã...
Page 15: Block Diagram
Block Diagram...
Page 16 Block Diagram Note:...
Page 17: Circuit Description
Overview The VX-900 is a UHF FM hand-held transceiver de- signed to operate in the frequency range of 400 to 512 MHz. Circuit Configuration by Frequency The receiver is a double-conversion superhetero- dyne with a first intermediate frequency (IF) of 44.25 MHz and a second IF of 450 kHz.
Page 18 Circuit Description The resulting DC squelch control voltage is passed to pin 19 of the microprocessor Q1050. If no carrier is received, this signal causes pin 6 of Q1052 (BU2090FS) to go low and pin 89 of Q1050 to go high.
Page 19 Transmit Inhibit When the Transmit PLL is unlocked, pin 18 of PLL chip Q1053 goes to logic "low." The resulting DC "unlock" control voltage is passed to pin 20 of mi- croprocessor Q1050. While the transmit PLL is un- locked, pin 85 of Q1050 remains low, which then turns off the Automatic Power Controller Q1024 (PDTC144EE) and Q1018 (NJM2902V) to disable the supply voltage to the Power Module Q1016, dis-...
Page 20: Alignment
Alignment Introduction The VX-900 is carefully aligned at the factory for the specified performance across the frequency range specified for each version. Realignment should therefore not be necessary except in the event of a component failure, or when altering the ver- sion type.
Page 21: Important Note
Important Note When connecting the CT-71 plug into the MIC/ SP jack of the VX-900, you must remove the plastic cap and its mounting screws prior to programming. Please remember to re-attach the cap and screws when the programming is complete.
Page 22 Alignment portant that you follow the basic alignment sequence precisely, so that the displayed data and the data loaded into the transceiver are identical. Basic Alignment Sequence 1. Enter the alignment mode 2. Upload data from transceiver 3. Align data 4.
Page 23 • Use the [t] or [u] key to select the "MID" fre- quency channel in the alignment range. • Disable any subaudible tone signaling on this channel, if present. • Press the [space] key on the computer keyboard to start alignment. This activates the transmitter, and injects a 1 kHz test tone.
Page 24 Alignment Channels The following parameters may be adjusted individu- ally for each channel. For example, minor variations in the power output across the operating band may be equalized by following this section’s instructions. (2) Channels TX : - [0] T OWER This parameter is used to trim Tx power on the displayed channel.
Page 25: Test Adapter Schematic
AF Test Adapter Schematic YAESU P/N: T9206933 Because of the bridge audio amplifier circuit used in the VX-900, it is necessry to construct and use a simple audio load test adapter as shown in the schematic diagram above, when con- ducting receiver alignment steps.
Page 26 Note:...
Page 27: Main Unit
Main Unit Circuit Diagram...
Page 28 Main Unit Note:...
Page 29 Parts Layout CPH6102 (AB) UMG2N (G2) TDA2822D (Q1008, 1037) (Q1007,1011) S-80735SN-DZ (DZ) XN1501 (5R) TK71635SCL (L35) (Q1034) (Q1035) (Q1036) UMC5N (C5) 2SA1774 (FR) PDTC144EE (26) (Q1014) (Q1017, 1020) (Q1015) (Q1019, 1024) S-93C56AMFN 2SC4617 (BR) UN911F (60) (Q1048, 1059) (Q1040) (Q1042, 1047) Side A NJM2902V (Q1018, 1022, 1058)
Page 30 Main Unit XP1501 (5R) CPH6102 (AB) UMZ2N (Z2) (Q1001) (Q1003) (Q1002) M68732HA-22 PDTC144EE (26) M62364FP (Q1023, 1030, 1033, (Q1016) (Q1021) 1045, 1056, 1057) AK2345 (Q1027) UMG2N (G2) 2SD1767 (DC) (Q1005) (Q1004) 2SC3356 (R24) (Q1026) 2SC4227 (R32) (Q1041) 2SC4617 (BR) TA31136FN 2SK508 (K52) (Q1043, 1051, 1054, 1055) (Q1049)
Page 31 Main Unit (Lot. 5~) Circuit Diagram...
Page 32 Main Unit (Lot. 5~) Note:...
Page 33 Parts Layout CPH6102 (AB) UMG2N (G2) TDA2822D (Q1008, 1037) (Q1014) (Q1007,1011) S-80735SN-DZ (DZ) XN1501 (5R) TK71635SCL (L35) (Q1034) (Q1035) (Q1036) NJM2902V UMC5N (C5) 2SA1774 (FR) PDTC144EE (26) (Q1017, 1020) (Q1018, 1022, 1058) (Q1015) (Q1019, 1024) S-93C56AMFN 2SC4617 (BR) UN911F (60) LC87F72C8A (Q1040) (Q1042, 1047)
Page 34 Main Unit (Lot. 5~) XP1501 (5R) UMZ2N (Z2) CPH6102 (AB) (Q1001) (Q1002) (Q1003) M68732HA-22 PDTC144EE (26) M62364FP (Q1023, 1030, 1033, (Q1016) (Q1021) 1045, 1056, 1057) AK2345 (Q1027) 2SD1767 (DC) UMG2N (G2) (Q1004) (Q1005) 2SC3356 (R24) (Q1026) 2SC4227 (R32) (Q1041) 2SC4617 (BR) TA31136FN 2SK508 (K52) (Q1043, 1051, 1054, 1055)
Page 35: Parts List
Parts List REF. DESCRIPTION VALUE PCB with Components (W/ VR-UNIT) PCB with Components (W/ VR-UNIT) PCB with Components (W/ VR-UNIT) PCB with Components (W/ VR-UNIT) PCB with Components (W/ VR-UNIT) PCB with Components (W/ VR-UNIT) Printed Circuit Board Printed Circuit Board C 1001 CHIP CAP.
Page 36 Main Unit REF. DESCRIPTION VALUE C 1025 CHIP CAP. C 1025 CHIP CAP. 0.5pF C 1026 CHIP CAP. C 1026 CHIP CAP. C 1026 CHIP CAP. C 1026 CHIP CAP. C 1026 CHIP CAP. 10pF C 1027 CHIP TA.CAP. 10uF C 1028 CHIP CAP.
Page 37 REF. DESCRIPTION VALUE C 1054 CHIP CAP. 0.01uF C 1055 CHIP CAP. 150pF C 1056 CHIP CAP. 0.001uF C 1057 CHIP CAP. 0.1uF C 1058 CHIP CAP. 0.1uF C 1060 CHIP CAP. 150pF C 1061 CHIP TA.CAP. 10uF C 1062 CHIP CAP. 0.1uF C 1063 CHIP CAP.
Page 38 Main Unit REF. DESCRIPTION VALUE C 1105 CHIP CAP. 22pF C 1105 CHIP CAP. 22pF C 1106 CHIP CAP. 10pF C 1106 CHIP CAP. 12pF C 1106 CHIP CAP. C 1106 CHIP CAP. 10pF C 1106 CHIP CAP. C 1107 CHIP CAP. 0.001uF C 1108 CHIP CAP.
Page 39 REF. DESCRIPTION VALUE C 1146 CHIP CAP. 0.001uF C 1147 CHIP CAP. 100pF C 1148 CHIP CAP. 0.001uF C 1149 CHIP TA.CAP. C 1150 CHIP CAP. 150pF C 1151 CHIP CAP. 0.001uF C 1152 CHIP CAP. 0.01uF C 1153 CHIP CAP. 150pF C 1154 CHIP TA.CAP.
Page 40 Main Unit REF. DESCRIPTION VALUE C 1206 CHIP CAP. 0.1uF C 1207 CHIP TA.CAP. 4.7uF C 1208 CHIP CAP. 0.1uF C 1209 CHIP TA.CAP. 10uF C 1210 CHIP CAP. 10pF C 1212 CHIP CAP. 10pF C 1212 CHIP CAP. 15pF C 1213 CHIP CAP.
Page 41 REF. DESCRIPTION VALUE C 1237 CHIP CAP. C 1238 CHIP TA.CAP. 10uF C 1238 CHIP TA.CAP. 10uF C 1239 CHIP CAP. C 1239 CHIP CAP. C 1239 CHIP CAP. C 1240 CHIP TA.CAP. 4.7uF C 1241 CHIP CAP. 15pF C 1242 CHIP CAP. 0.01uF C 1243 CHIP CAP.
Page 42 Main Unit REF. DESCRIPTION VALUE C 1296 CHIP CAP. 0.1uF C 1297 CHIP CAP. 0.1uF C 1298 CHIP CAP. 0.047uF C 1299 CHIP CAP. 56pF C 1300 CHIP CAP. 100pF C 1301 CHIP CAP. 100pF C 1302 CHIP CAP. 82pF C 1303 CHIP CAP.
Page 43 REF. DESCRIPTION VALUE D 1016 DIODE D 1017 LED D 1018 LED D 1019 LED D 1020 LED D 1021 DIODE D 1022 LED D 1023 LED D 1025 DIODE D 1026 DIODE D 1026 DIODE D 1027 DIODE D 1028 DIODE D 1029 DIODE D 1030 DIODE D 1031 DIODE...
Page 44 Main Unit REF. DESCRIPTION VALUE L 1009 COIL 0.012uH L 1010 M.RFC 0.1uH L 1011 COIL 0.012uH L 1012 COIL 0.014uH L 1013 M.RFC 0.082uH L 1014 COIL 0.014uH L 1014 COIL 0.014uH L 1014 COIL 0.017uH L 1014 COIL 0.014uH L 1014 COIL...
Page 45 REF. DESCRIPTION VALUE L 1044 M.RFC 0.047uH L 1044 M.RFC 0.047uH L 1044 M.RFC 0.056uH L 1044 M.RFC 0.047uH L 1044 M.RFC 0.039uH L 1045 M.RFC 0.056uH L 1045 M.RFC 0.056uH L 1045 M.RFC 0.068uH L 1045 M.RFC 0.056uH L 1045 M.RFC 0.056uH L 1047...
Page 46 Main Unit REF. DESCRIPTION VALUE Q 1043 TRANSISTOR Q 1044 TRANSISTOR Q 1045 TRANSISTOR Q 1046 TRANSISTOR Q 1047 TRANSISTOR Q 1048 TRANSISTOR Q 1049 IC Q 1050 IC Q 1051 TRANSISTOR Q 1052 IC Q 1053 IC Q 1054 TRANSISTOR Q 1055 TRANSISTOR Q 1056 TRANSISTOR Q 1057 TRANSISTOR...
Page 47 REF. DESCRIPTION VALUE R 1040 CHIP RES. R 1041 CHIP RES. R 1042 CHIP RES. R 1043 CHIP RES. R 1045 CHIP RES. R 1046 CHIP RES. R 1047 CHIP RES. R 1048 CHIP RES. R 1049 CHIP RES. R 1050 CHIP RES. R 1051 CHIP RES.
Page 48 Main Unit REF. DESCRIPTION VALUE R 1087 CHIP RES. R 1088 CHIP RES. R 1089 CHIP RES. 1.5k R 1090 CHIP RES. R 1091 CHIP RES. R 1093 CHIP RES. 4.7k R 1093 CHIP RES. 4.7k R 1093 CHIP RES. 4.7k R 1093 CHIP RES.
Page 49 REF. DESCRIPTION VALUE R 1142 CHIP RES. 150k R 1143 CHIP RES. R 1144 CHIP RES. R 1145 CHIP RES. 390k R 1146 CHIP RES. 220k R 1147 CHIP RES. R 1148 CHIP RES. R 1149 CHIP RES. R 1150 CHIP RES. R 1151 CHIP RES.
Page 50 Main Unit REF. DESCRIPTION VALUE R 1196 CHIP RES. 220k R 1197 CHIP RES. R 1198 CHIP RES. R 1199 CHIP RES. 4.7k R 1200 CHIP RES. R 1201 CHIP RES. 470k R 1202 CHIP RES. R 1203 CHIP RES. 470k R 1204 CHIP RES.
Page 51 REF. DESCRIPTION VALUE R 1256 CHIP RES. 470k R 1257 CHIP RES. 1.8k R 1258 CHIP RES. R 1259 CHIP RES. R 1260 CHIP RES. 2.7k R 1261 CHIP RES. R 1262 CHIP RES. R 1263 CHIP RES. R 1264 CHIP RES. R 1265 CHIP RES.
Page 52 Main Unit REF. DESCRIPTION VALUE R 1316 CHIP RES. R 1317 CHIP RES. 100k R 1318 CHIP RES. 4.7k R 1319 CHIP RES. R 1320 CHIP RES. R 1321 CHIP RES. R 1322 CHIP RES. R 1323 CHIP RES. R 1324 CHIP RES. R 1325 CHIP RES.
Page 53 REF. DESCRIPTION VALUE XF1001 XTAL FILTER XF1002 XTAL FILTER HOLDER PLATE MIC HOLDER RUBBER SHIELD CASE VCO MIC HOLDER RUBBER HOLDER PLATE LIGHT GUIDE BRACKET HOLDER PLATE RUBBER HOLDER HOLDER INTER CONNECTOR INTER CONNECTOR SHIELD CASE COVER SHIELD CASE COVER REFLECTOR SHEET REFLECTOR SHEET DIFFUSER SHEET...
Page 54 Main Unit Note:...
Page 55: Vr Unit
Circuit Diagram Parts Layout Parts List REF. DESCRIPTION VALUE PCB with Components Printed Circuit Board D 5001 D 5001 LED D 5002 LED D 5003 LED D 5003 LED S 5001 ROTARY SWITCH VR5001 POT. VR5001 POT. Side A BRPY1211F (D5002) TOL.
Page 56: Sw Unit
SW Unit Circuit Diagram Parts Layout Parts List REF. DESCRIPTION VALUE PCB with Components Printed Circuit Board S 3001 TACT SWITCH S 3002 TACT SWITCH S 3003 TACT SWITCH S 3004 TACT SWITCH MYLAR SHEET Side A TOL. MFR’S DESIG *** SW-UNIT *** SOP-114HST R66-5374 SOP-114HST R66-5374...
Page 57: Dummy Unit
Circuit Diagram Parts Layout Parts List REF. DESCRIPTION VALUE PCB with Components Printed Circuit Board C 4001 CHIP CAP. 0.0018uF C 4002 CHIP CAP. 0.1uF J 4001 CONNECTOR R 4001 CHIP RES. Component Side TOL. MFR’S DESIG *** DUMMY-UNIT *** GRM39B182M50PT GRM39B104K16PT AXK5S40035P...
Page 58: F2D-8 2-Tone Decode Unit
F2D-8 2-Tone Decode Unit Circuit Diagram Parts Layout TC7S04FU (E5) TA75S01F (SA) (Q1003) (Q1004) Side A HD64F3334YTF16 (Q1001) Side B DTC124TU (05) (Q1005)
Page 59 Parts List REF. DESCRIPTION VALUE Printed Circuit Board C 1001 CHIP TA.CAP. 4.7uF C 1002 CHIP CAP. 0.001uF C 1003 CHIP CAP. 0.01uF C 1007 CHIP CAP. 0.1uF C 1007 CHIP CAP. 0.0015uF C 1007 CHIP CAP. 0.01uF C 1008 CHIP CAP. 0.1uF C 1009 CHIP CAP.
Page 60: Vtp-50 Vx-Trunk Unit
VTP-50 VX-Trunk Unit Circuit Diagram Parts Layout NJM2904V (Q1001) Side A TA75S01F (SA) MC68HSC705C8A502 (Q1002) (Q1003) Side B BR93LC56FV (Q1004)
Page 61 Parts List REF. DESCRIPTION VALUE Printed Circuit Board C 1002 CHIP CAP. 0.001uF C 1003 CHIP CAP. 0.01uF C 1003 CHIP CAP. 0.01uF C 1004 CHIP CAP. 0.1uF C 1004 CHIP CAP. 0.01uF C 1005 CHIP CAP. 0.01uF C 1005 CHIP CAP. 0.01uF C 1006 CHIP CAP.
Page 62: Fvp-25 Encryption / Dtmf Pager Unit
FVP-25 Encryption / DTMF Pager Unit Circuit Diagram Parts Layout M64026FP (Q1001) Side A LC73881 (Q1002) Side B DTC144EU (26) (Q1003)
Page 63 Parts List REF. DESCRIPTION VALUE Printed Circuit Board C 1001 CHIP CAP. 0.1uF C 1002 CHIP CAP. 0.01uF C 1003 CHIP CAP. 10pF C 1004 CHIP CAP. 10pF C 1005 CHIP CAP. 0.1uF C 1007 CHIP CAP. 0.1uF C 1007 CHIP CAP. 0.01uF C 1008 CHIP CAP.
Page 64: F5D-14 5-Tone Unit
Circuit Diagram Parts Layout TK71650SC (L50) DTC114TE (04) (Q1001) (Q1002) Side A PIC17LC44-08/PQ 2SC4617 (BR) (Q1003) (Q1004) Side B MD09 BR93LC66FV (Q1005) (Q1006)
Page 65 Parts List REF. DESCRIPTION VALUE Printed Circuit Board Printed Circuit Board C 1001 CHIP CAP. 0.1uF C 1002 CHIP CAP. 0.0018uF C 1003 CHIP CAP. 0.001uF C 1005 CHIP CAP. 0.01uF C 1006 CHIP CAP. 0.01uF C 1007 CHIP CAP. 0.1uF C 1008 CHIP TA.CAP.

Vertex Standard VX-900 Service Manual

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