Yaesu FT-8900R Service Manual

Quad Band FM Transceiver

VOL

V/MHMSCN

PWR

FT-8900R

Technical Supplement

2002 VERTEX STANDARD CO., LTD. (EH008M90A)

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

SQL SQL

VOL

LOW

KEY2

LOW

Introduction

This manual provides technical information necessary for servicing the FT-8900R 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 thr board 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.

Contents

Specifications .................................................... 2

Exploded View & Miscellaneous Parts ........ 3

Connection Diagram ........................................ 4

Circuit Description........................................... 5

Alignment ........................................................ 11

Board Unit (Schematics, Layouts & Parts)

Main Unit .....................................................................17

Panel Unit..................................................................... 47

Panel-Sub Unit .............................................................53

VR-L Unit .....................................................................55

VR-R Unit .....................................................................56

Specifications

GENERAL

Frequency Range: RX: 28.000 - 29.700 MHz, 50.000 - 54.000 MHz,

108.000 - 180.000 MHz, 320.000 - 480.000 MHz, 700 - 985 MHz (Cellular Blocked)

TX: 28.000 - 29.700 MHz, 50.000 - 54.000 MHz,

144.000 - 146.000 MHz (or 144.000 - 148.000 MHz),

430.000 - 440.000 MHz (or 430.00 - 450.000 MHz)

Channel Steps: 5/10/12.5/15/20/25/50 kHz Modes of Emission: F3, F2, F1 Antenna Impedance: 50-Ohms, unbalanced (Antenna Duplexer built-in) Frequency Stability: ±5 ppm @ 14° F ~ +140° F (–10 °C ~ +60 °C) Operating Temperature Range: –4° F ~ +140° F (–20 °C ~ +60 °C) Supply Voltage: 13.8 VDC (±15%), negative ground Current Consumption (Approx.): RX: 0.5 A (Squelched)

TX: 8.0 A (50/430 MHz), 8.5 A (29/144 MHz)

Case Size (W x H x D): 5.5” x 1.6” x 6.6” (140 x 41.5 x 168 mm) (w/o knobs & connectors) Weight (Approx.): 2.2 lb (1 kg)

TRANSMITTER

Output Power: 50/20/10/5 W (29/50/144 MHz),

35/20/10/5 W (430 MHz)

Modulation Type: Variable Reactance Maximum Deviation: ±5 kHz (50/144/430 MHz),

±2.5 kHz (29 MHz)

Spurious Radiation: Better than –60 dB (29 MHz: Better than –50 dB) Modulation Distortion: Less than 3% Microphone Impedance: 2 kW DATA Jack Impedance: 10 kW

RECEIVER

Circuit Type: Double-conversion superheterodyne Intermediate Frequencies: 45.05 MHz/450 kHz (Left band),

47.25 MHz/450 kHz (Right band) Sensitivity (for 12dB SINAD): Better than 0.2 µV Squelch Sensitivity: Better than 0.16 µV Selectivity (–6dB/–60dB): 8 kHz/30 kHz (50/144/430 MHz),

6 kHz/30 kHz (29 MHz) Maximum AF Output: 2 W @ 8 W for 5% THD AF Output Impedance: 4-16 W

Specifications are subject to change without notice, and are guaranteed within the 29, 50, 144, and 430 MHz amateur bands only. Frequency ranges will vary according to transceiver version; check with your dealer.

Exploded View & Miscellaneous Parts

‚

RA02132A0

HIMERON TAPE

M4090149 SPEAKER

T9206438A

WIRE ASSY

R0150630

HOLDER

MAIN UNIT

‚

„

‚

RA0415200 (x2 pcs) GROUND PLATE

„

ƒ ƒ

‚

ƒ ƒ

‚

RA0446200 (x2 pcs) LEAF SPRING

RA0441300 PAD

CS1770001 CASE (W/O NYLON NET)

T9206228 WIRE ASSY

S5000206 FAN GUARD

†

FRONT PANEL ASSY

RA0404200 (x2 pcs)

ENCODER KNOB

RA0404300 (x2 pcs)

KNOB

RA040470A

REFLECTOR SHEET

G6090147A

RA0396800

LCD HOLDER

R6054387B (x2 pcs) SPECIAL NUT

RA0404400 (x2 pcs) KNOB

VR-L Unit

RA0397100

LCD

PANEL Unit

RA0396900 (x2 pcs) INTER CONNECTOR

RA040710A

LIGHT SHEET

RELEASE KNOB

RA0407200 SPACER

RA0396700 LIGHT GUIDE

RA0397000 DIFFUSER SHEET

R0137550

COIL SPRING

RA026900A

•

T9207010A WIRE ASSY

VR-R UNIT

RA0438700

RA02668AA

CHASSIS

‚

•

PANEL-SUB UNIT

RUBBER

‚

T9101509 CT CABLE

RA0396100 REAR PANEL

M2090034A FAN

…

P1090984 CONNECTOR

RA040480A SUB PANEL ASSY (W/ COIL SPRING, RELEASE KNOB)

No. VXSTD P/N DESCRIPTION QTY.

• U23116007 TAPTITE SCREW M2X16B 4 ‚ U31206007 OVAL HEAD SCREW M2.6X6B 14 ƒ U44308002 TAPTITE SCREW M3X8NI 17 „ U03310002 SEMS SCREW ASM3X10NI 4 … U20308002 BINDING HEAD SCREW M3X8NI 2 † U20318007 BINDING HEAD SCREW M3X18B 4

Non-designated parts are available only as part of a designated assembly.

Connection Diagram

Circuit Description

Receiver Signal Path

“Left” Band 430 MHz Signal

The 430 MHz signal is passed through a high-pass filter network and a low-pass filter network to the antenna switch diodes D1001/D1002 (both RLS135), then passed through another low-pass filter network to the “Left” band RF amplifier Q1001 (3SK296ZQ).

The amplified 430 MHz signal is passed through the band switch D1008 (HSC277) to the varactor-tuned band-pass filter network consisting of D1009, D1010, D1011 (all HVC358B) and associated circuitry, then applied to the first mixer Q1004 (3SK296ZQ). Meanwhile, the UHF local signal from the UHF-VCO/A Q1112 (2SC5006) is delivered to first mixer Q1004, yielding the 45.05 MHz “Left” band first IF.

“Left” Band 144 MHz Signal

The 144 MHz signal is passed through a low-pass filter network and a high-pass filter network to the antenna switching relay RL1001 (G5A-237P), then passed through another high-pass filter network and low-pass filter network to the “Left” band RF amplifier Q1006 (3SK296ZQ).

The amplified 144 MHz signal is passed through a varactor-tuned band-pass filter network consisting of D1019, D1020, D1021 (all HVC365) and associated circuitry to the first mixer Q1010 (3SK296ZQ). Meanwhile, the VHF local signal from the VHF-VCO/A Q1115 (2SC5374) is delivered to first mixer Q1010, yielding the 45.05 MHz “Left” band first IF.

“Left” Band 50 MHz Signal

The 50 MHz signal is passed through a low-pass filter network and antenna switching relay RL1003 (G5A-237P), then passed through another low-pass filter network, antenna switch relay RL1002 (G5A-237P), and band switch diode D1144 (HSC277) to yet another low-pass filter network, then applied to the “Left” band RF amplifier Q1006 (3SK296ZQ).

The amplified 50 MHz signal is passed through a bandpass filter network and band switch diode D1027 (HSC277) to the first mixer Q1015 (3SK296ZQ). Meanwhile, the 50 MHz local signal from the RX50-29-VCO Q1121 (2SC5374) is delivered to first mixer Q1015, yielding the 45.05 MHz “Left” band first IF.

“Left” Band 28 MHz Signal

The 28 MHz signal is passed through a low-pass filter network and antenna switching relay RL1003 (G5A-237P), then passed through another low-pass filter network, antenna switching relay RL1002 (G5A-237P) and band switch diode D1144 (HSC277) to yet another low-pass filter network, then delivered to the “Left” band RF amplifier Q1012 (2SC5374).

The amplified 28 MHz signal is passed through a bandpass filter network and band switch diode D1028 (HSC277) to the first mixer Q1015 (3SK296ZQ). Meanwhile, the 28 MHz local signal from the RX50-29-VCO Q1121 is delivered to first mixer Q1012, yielding the 45.05 MHz “Left” band first IF.

“Left” Band IF and AF Signals

The 45.05 MHz “Left” band first local signal is delivered to the monolithic crystal filter XF1002 which strips away unwanted mixer products, then is passed through IF amplifier Q1019 (2SC4400) to the IF IC Q1024 (TA31136FN).

Meanwhile, a portion of the output of 11.15 MHz crystal X1003 is multiplied fourfold by Q1027 (2SC4400) to pro- vide the 44.6 MHz second local signal, then delivered to the IF IC Q1024. Within the IF IC Q1024, the 44.6 MHz second local signal is mixed with the 45.05 MHz “Left” band first local signal to produce the 450 kHz “Left” band second IF.

The 450 kHz “Left” band second IF is passed through the filter switch D1033/D1034 (both DAN235E) to the ceramic filter CF1002 (CFWM450E) which strips away all but the desired signal, then it passes through the IF amplifier within Q1024 to the ceramic discriminator CD1002 (CDBM450C24), which removes any amplitude variations in the 450 kHz IF signal before detection of speech.

The demodulated “Left” band audio is passed through the de-emphasis network, audio switch D1035 (DAN222), low-pass filter network (consisting of Q1034 (NJM2902V) and associated circuitry), and a high-pass filter network (consisting of Q1025 (NJM2092V) and associated circuitry). The filtered audio signal is passed through the audio volume control IC Q1042 (M511312FP), which adjusts the audio sensitivity to compensate for audio level variations, then is delivered to the audio switch Q1046 and Q1047 (both TC4W66FU).

When the internal speaker is selected, the audio signal is amplified by Q1050 (TDA7233D) then applied to the internal loudspeaker. When the external speaker is selected, the audio signal is amplified by Q1045 (LA4425A), then it passes through the EXT SP jack to the external loudspeaker.

“Right” Band 430 MHz Signal

The 430 MHz signal is passed through a high-pass filter network and a low-pass filter network to the antenna switch diodes D1001/D1002, then passed through another low-pass filter network to the “Right” band RF amplifier Q1002 (3SK296ZQ).

The amplified 430 MHz signal is delivered through the band switch D1008 (HSC277) to the varactor-tuned bandpass filter network consisting of D1004, D1005, D1006 (all

HVC358B) and associated circuitry, then applied to the

Circuit Description

first mixer Q1003 (3SK296ZQ). Meanwhile, the UHF local signal from the UHF-VCO/B Q1106 (2SC5006) is delivered to first mixer Q1004, yielding the 47.25 MHz “Right” band first IF.

“Right” Band 144 MHz Signal

The amplified 144 MHz signal is passed through the varactor-tuned band-pass filter network consisting of D1016, D1017, D1018 (all HVC365) and associated circuitry to the first mixer Q1008 (3SK296ZQ). Meanwhile, the VHF local signal from the VHF-VCO/B Q1109 (2SC5374) is delivered to first mixer Q1008, yielding the 47.25 MHz “Right” band first IF.

“Right” Band IF and AF Signal

The 47.25 MHz “Right” band first IF is delivered to the monolithic crystal filter XF1001 which strips away unwanted mixer products, then passed through the IF amplifier Q1017 (2SC4400) to the IF IC Q1018 (TA31136FN).

Meanwhile, a portion of the output of 11.7 MHz crystal X1002 is multiplied fourfold by Q1026 (2SC4400) to pro- vide the 46.8 MHz second local signal, then applied to the IF IC Q1018. Within the IF IC Q1018, the 46.8 MHz second local signal is mixed with the 47.25 MHz “Right” band first local signal to produce the 450 kHz “Right” band second IF.

The 450 kHz “Right” band second IF is delivered to the ceramic filter CF1001 (CFWM450E) which strips away all but the desired signal, then passed through the IF amplifier within Q1018 to the ceramic discriminator CD1001 (CDBM450C24) which removes any amplitude variations in the 450 kHz IF signal before detection of speech.

Squelch Control

“Left” Band

When no carrier is being received on the “Left” band, noise at the output of the detector stage in Q1024 is amplified and band-pass filtered by the noise amp section of Q1024. The resulting DC voltage is delivered to pin 2 of main CPU Q1084 (M38268MCL), which compares the squelch threshold level to that which set by the front panel SQL knob.

While no carrier is being received on the “Left” band, pins 43 and 45 of Q1084 remain “low,” to disable the audio switch Q1046/Q1047, thus disabling the audio output from the speaker.

“Right” Band

When no carrier is being received on the “Right” band, noise at the output of the detector stage in Q1018 is amplified and band-pass filtered by the noise amp section of Q1018. The resulting DC voltage is delivered to pin 5 of main CPU Q1084, which compares the squelch threshold level to that which set by the front panel SQL knob.

While no carrier is being received on the “Left” band, pins 42 and 44 of Q1084 remain “low,” to disable the audio switch Q1046 and Q1047, thus disabl ing the audio output from the speaker.

Transmitter Signal Path

AF Signal

The speech signal from the microphone is passed through the MIC jack J3003 to the AF amplifier Q3001 (NJM2904V) on the PANEL-SUB UNT. The amplified speech signal is passed through the panel separation jacks J3001 and J1005 to the MAIN Unit. On the MAIN UNIT, the speech signal is delivered to the limiting amplifier Q1054 (NJM2902V) to prevent over-modulation, then is delivered to a lowpass filter network consisting of Q1054 and associated circuitry.

The demodulated “Right” band audio is passed through the de-emphasis network, low-pass filter network (consisting of Q1033 (NJM2902V) and associated circuitry) and the high-pass filter network (consisting of Q1025 (NJM2092V) and associated circuitry). The filtered audio signal is passed through the audio volume control IC Q1042 (M511312FP), which adjusts the audio sensitivity to compensate for audio level variations, then is delivered to the audio switch Q1046 and Q1047 (both TC4W66FU).

430 MHz Signal

The adjusted speech signal from Q1054 is passed through transistor switch Q1051 (BU4066BCFV) to varactor diodes D1069 (HVC375) and D1070 (HVC350B), which fre- quency modulate the transmitting VCO, made up of UHFVCO/B Q1106 (2SC5006) and D1071 (HSC277).

The modulated transmit signal is passed through buffer amplifiers Q1107, Q1108, and Q1146 (all 2SC5006) and diode switches D1073 (HSC277) and D1128 (DAN235E) to the pre-drive amplifier Q1139 (2SK2596).

The amplified transmit signal from Q1139 is passed through diode switch D1134 (HSC277) and the driver amplifier Q1137 (2SK2975) to the diode switch D1134 (HSC277), then finally amplified by power amplifier

Circuit Description

Q1134 (RD70HVF1), providing up to 35 Watts of power

output. These three stages of the power amplifier’s gain are controlled by the APC circuit.

The 35-Watt RF signal is passed through a high-pass filter network to the antenna switch D1102, D1104, and D1146 (all UM9957F), then passed through a low-pass filter network and another high-pass filter network to the ANT jack.

144 MHz Signal

The adjusted speech signal from Q1054 is passed through the transistor switch Q1051 (BU4066BCFV) to varactor diodes D1076 and D1077 (both HVC365), which frequency modulate the transmitting VCO, made up of VHF-VCO/ B Q1109 (2SC5374) and D1078 (HSC277).

The modulated transmit signal is passed through buffer amplifiers Q1100 and Q1111 (both 2SC5374) and diode switches D1075 (HSC277) and D1128 (DAN235E) to the pre-drive amplifier Q1139 (2SK2596).

The amplified transmit signal from Q1139 is passed through the diode switch D1139/D1140 (both HSC277) and the driver amplifier Q1137 (2SK2975) to diode switch D1133 (RLS135), then finally amplified by power ampli- fier Q1134 (RD70HVF1) up to 50 Watts of power output. These three stages of the power amplifier’s gain are controlled by the APC circuit.

The 50-Watt RF signal is passed through a low-pass filter network to the antenna switching relay RL1001 (G5A- 237P), then passed through a high-pass filter network and another low-pass filter network to the ANT jack.

50 MHz Signal

The adjusted speech signal from Q1054 is passed through transistor switch Q1086 (BU4066BCFV) to varactor diode D1093 (HVC300A), which frequency modulates the transmitting VCO, made up of TX50-29-VCO Q1118 (2SC5374) and D1094 (HSC277).

The modulated transmit signal is passed through buffer amplifier Q1119 (2SC5374) to the pre-Drive amplifier Q1123 (2SC5374).

The amplified transmit signal from Q1123 is passed through diode switches D1127 (DAN235E) and D1141 (HSC277) and driver amplifier Q1137 (2SK2975) to diode switch D1132 (D1F20), then finally amplified by power amplifier Q1134 (RD70HVF1) up to 50 Watts of power output. These three stages of the power amplifier’s gain are controlled by the APC circuit.

The 50-Watt RF signal is passed through antenna switching relay RL1002 (G5A-237P) to a low-pass filter network, then passed through antenna switching relay RL1003 (G5A-237P) and another low-pass filter network to the ANT jack.

28 MHz Signal

The modulated transmit signal is passed through buffer amplifier Q1119 (2SC5374) to the pre-Drive amplifier Q1123 (2SC5374).

The amplified transmit signal from Q1123 is passed through diode switches D1127 (DAN235E) and D1142 (HSC277) and driver amplifier Q1137 (2SK2975) to diode switch D1132 (D1F20), then finally amplified by power amplifier Q1134 (RD70HVF1) up to 50 Watts of output power. There three stages of the power amplifier’s gain are controlled by the APC circuit.

APC (Automatic Power Control) Circuit

430 MHz

A portion of the power amplifier output is rectified by

D1103 and D1105 (both MA2S728) then delivered to APC Q1130 (NJM2904V), as a DC voltage which is proportional

to the output level of the power amplifier. At Q1130, the rectified DC voltage from the power am-

plifier is compared to the reference voltage from the main CPU Q1084 to produce a control voltage, which regulates the supply voltage to the pre-drive amplifier Q1139 (2SK5396), driver amplifier Q1137 (2SK2975), and power amplifier Q1134 (RD70HVF1), so as to maintain stable output power under varying antenna loading conditions.

144 MHz

A portion of the power amplifier output is rectified by

D1114 and D1115 (both MA2S728) then delivered to APC Q1130 (NJM2904V), as a DC voltage which is proportional

to the output level of the power amplifier. At Q1130, the rectified DC voltage from the power am-

50 MHz

A portion of the power amplifier output is rectified by

D1119 and D1121 (both MA2S728) then delivered to APC

Circuit Description

Q1130 (NJM2904V), as a DC voltage which is proportional

to the output level of the power amplifier. At Q1130, the rectified DC voltage from the power am-

plifier is compared to the reference voltage from the main CPU Q1084 to produce a control voltage, which regulates supply voltage to the pre-drive amplifier Q1123 (2SK5374), driver amplifier Q1137 (2SK2975), and power amplifier Q1134 (RD70HVF1), so as to maintain stable output power under varying antenna loading conditions.

29 MHz

A portion of the Power amplifier output is rectified by

D1120 and D1122 (both MA2S728) then delivered to APC Q1130 (NJM2904V), as a DC voltage which is proportional

to the output level of the power amplifier. At Q1130, the rectified DC voltage from the power am-

PTT (Push to Talk) Circuit

430 MHz

When the PTT switch is pressed, pin 8 of sub CPU Q2001 (M38223E4HP) goes “high,” which sends the “PTT” command to main CPU Q1084.

When the “PTT” command is received, the main CPU controls the I/O IC Q1075 (BU2090FS), causing pin 12 of Q1075 to go “low” which activates the UHF TX switch section of Q1076 (IMT17).

When the UHF TX switch section of Q1076 is activated, it controls the antenna switch diodes D1102, D1104, and D1146 (all UM9957F), modulator switching diode D1100 (DAN222), modulator switching IC Q1051 (BU4066BCFV), diode switches D1073 (HSC277), D1128 (DAN235E), D1140 (HSC277), and D1134 (HSC277), and APC switch- es Q1128 (RT1N441U) and Q1129 (RT1P441U), which activate the 430 MHz transmitter circuit.

144 MHz

When the PTT switch is pressed, pin 8 of sub CPU Q2001 (M38223E4HP) goes “high,” which sends the “PTT” command to main CPU Q1084.

When the “PTT” command is received, the main CPU controls the I/O IC Q1075 (BU2090FS), causing pin 13 of Q1075 to go “low” which activates the VHF TX switch section of Q1076 (IMT17).

When the VHF TX switch section of Q1076 is activated, it controls the antenna switching relay RL1001 (G5A-237P), modulator switching diode D1100 (DAN222), modulator

switching IC Q1051 (BU4066BCFV), diode switches D1075 (HSC277), D1128 (DAN235E), D1139 (HSC277),

and D1133 (RSL135), and APC switches Q1128 (RT1N441U) and Q1129 (RT1P441U), which activate the 144 MHz transmitter circuit.

50 MHz

When the PTT switch is pressed, pin 8 of sub CPU Q2001 (M38223E4HP) goes “high,” which sends the “PTT” command to the main CPU Q1084.

When the “PTT” command is received, the main CPU controls the I/O IC Q1075 (BU2090FS), causing pin 14 of Q1075 to go “low” which activates the TX50 switch section of Q1077 (IMT17).

When the TX50 switch section of Q1076 is activated, it controls the antenna switching relay RL1002 (G5A-237P), modulator switching diode D1092 (DAN222), modulator switching IC Q1086 (BU4066BCFV), diode switches D1127 (DAN235E), D1141 (HSC277), and D1132 (D1F20), and APC switches Q1128 (RT1N441U) and Q1129 (RT1P441U), which activate the 50 MHz transmitter circuit.

28 MHz

When the PTT switch is pressed, pin 8 of sub CPU Q2001 (M38223E4HP) goes “high,” which sends the “PTT” command to the main CPU Q1084.

When the “PTT” command is received, the main CPU controls the I/O IC Q1075 (BU2090FS), causing pin 15 of Q1075 to go “low” which activates the TX29 switch section of Q1077 (IMT17).

When the TX29 switch section of Q1076 is activated, it controls the antenna switching relay RL1003 (G5A-237P), modulator switching diode D1092 (DAN222), modulator switching IC Q1086 (BU4066BCFV), diode switches D1127 (DAN235E), D1142 (HSC277), and D1132 (D1F20), and APC switches Q1128 (RT1N441U) and Q1129 (RT1P441U), which activate the 28 MHz transmitter circuit.

PLL Circuit

“Left” band

A portion of the output from UHF-VCO/A Q1112 (2SC5006) is passed through buffer amplifier Q1113 (2SC5374) and diode switch D1084 (HSC277) to the programmable divider section of the PLL IC Q1095 (MB15A02PFV1), where it is divided according to the frequency dividing data associated with the operating frequency input from the main CPU Q1084. It is then sent to the phase comparator.

A portion of the output from the VHF-VCO/A Q1115 (2SC5374) is passed through buffer amplifier Q1116 (2SC5374) and diode switch D1089 (HSC277) to the programmable divider section of the PLL IC Q1095, where it

Circuit Description

is divided according to the frequency dividing data associated with the operating frequency input from the main CPU Q1084. It is then sent to the phase comparator.

A portion of the output from the TX50-29-VCO Q1118 (2SC5374) is passed through buffer amplifier Q1119 (2SC5374) and diode switch D1096 (HSC277) to the programmable divider section of the PLL IC Q1095, where it is divided according to the frequency dividing data associated with the operating frequency input from the main CPU Q1084. It is then sent to the phase comparator.

A portion of the output from the RX50-29-VCO Q1121 (2SC5374) is passed through buffer amplifier Q1122 (2SC5374) and diode switch D1096 to the programmable divider section of the PLL IC Q1095, where it is divided according to the frequency dividing data associated with the operating frequency input from the main CPU Q1084. It is then sent to the phase comparator.

The 11.15 MHz reference oscillator X1003 frequency is divided by the reference frequency divider section of Q1095 into 2230 or 1784 parts, to become 5 kHz or 6.25 kHz comparative reference frequencies, which are utilized by the phase comparator.

The phase comparator section of Q1095 compares the phase between the frequency-divided oscillation frequency of the VCO circuit and the comparative frequency, and its output is a pulse corresponding to the phase difference. This pulse is integrated by the charge pump consisting of D1067 (UDZS5.1B), Q1098 (2SA1774), Q1099 (2SC4617), and loop filter into a control voltage (VCV) to control the oscillation frequency of the VCOs.

“Right” band

A portion of the output from the UHF-VCO/B Q1106 (2SC5006) is passed through buffer amplifier Q1107 (2SC5006) and diode switch D1079 (HSC277) to the programmable divider section of the PLL IC Q1090 (MB15A02PFV1), where it is divided according to the frequency dividing data associated with the operating frequency input from the main CPU Q1084. It is then sent to the phase comparator.

A portion of the output from the VHF-VCO/B Q1109 (2SC5374) is passed through buffer amplifier Q1110 (2SC5374) and diode switch D1080 (HSC277) to the programmable divider section of the PLL IC Q1090, where it is divided according to the frequency dividing data associated with the operating frequency input from the main CPU Q1084. It is then sent to the phase comparator.

The 11.70 MHz reference oscillator X1002 frequency is divided by the reference frequency divider section of Q1090 into 2340 or 1872 parts to become 5 kHz or 6.25 kHz comparative reference frequencies, which are utilized by the phase comparator.

The phase comparator section of Q1090 compares the phase between the frequency-divided oscillation frequency of the VCO circuit and the comparative frequency, and its output is a pulse corresponding to the phase difference. This pulse is integrated by the charge pump consisting of D1061 (UDZS5.1B), Q1091 (2SA1774), Q1092 (2SC4617), and loop filter into a control voltage (VCV) to control the oscillation frequency of the VCOs.

Power Supply Line

When the user presses and holds in the “Left” VOL knob for 2 seconds, pin 23 of the main CPU Q1084 goes “low” and pin 39 of main CPU Q1084 goes “high,” which activates the power switch Q1057 (2SB1301), Q1061 (2SC4617), and Q1062 (2SA1774), to supply 13.8 VDC to each circuit in the transceiver.

Note

Alignment

QUAD BAND FM TRANSCEIVER

Power Supply

Pin 5

Frequency

Deviation

Inline

Wattmeter

50-ohm

Dummy Load

RF Sampling

RF Signal

Generator

Introduction and Precautions

The FT-8900R has been carefully aligned at the factory for the specified performance across the 29 MHz, 50 MHz, 144 MHz and 430 MHz amateur bands. Realignment should therefore not be necessary except in the event of a component failure. All component replacement and service should be performed only by an authorized Vertex Standard representative, or the warranty policy may be voided.

The following procedures cover the sometimes critical and tedious adjustments that are not normally required once the transceiver has left the factory. However, if damage occurs and some parts are replaced, realignment may be required. If a sudden problem occurs during normal operation, it is likely due to component failure; realignment should not be done until after the faulty component has been replaced.

We recommend that servicing be performed only by authorized Vertex Standard service technicians who are experienced with the circuitry and fully equipped for repair and alignment. Therefore, if a fault is suspected, contact the dealer from whom the transceiver was purchased for instructions regarding repair. Authorized Vertex Standard service technicians realign all circuits and make complete performance checks to ensure compliance with factory specifications after replacing any faulty components.

Those who do undertake any of the following alignments are cautioned to proceed at their own risk. Problems caused by unauthorized attempts at realignment are not covered by the warranty policy. Also, Vertex Standard must reserve the right to change circuits and alignment procedures in the interest of improved performance, without notifying owners.

Under no circumstances should any alignment be attempted unless the normal function and operation of the transceiver are clearly understood, the cause of the malfunction has been clearly pinpointed and any faulty components replaced, and the need for realignment determined to be absolutely necessary.

SINAD Meter

8-ohm

Dummy Load

EXT SP

13.8 VDC

FT-8900R

Coupler

Counter

Meter

AF Signal Generator

Required Test Equipment

The following test equipment (and thorough familiarity with its correct use) is necessary for complete realignment. Correction of problems caused by misalignment resulting from use of improper test equipment is not covered under the warranty policy. While most steps do not require all of the equipment listed, the interactions of some adjustments may require that more complex adjustments be performed afterwards. Do not attempt to perform only a single step unless it is clearly isolated electrically from all other steps. Have all test equipment ready before beginning, and follow all of the steps in a section in the order presented.

r Regulated DC Power Supply: adjustable from 10 to

17 VDC, 15 A

r RF Signal Generator with calibrated output level at

500 MHz

r Frequency Counter: ±0.1 ppm accuracy at 500 MHz r AF Signal Generator r SINAD Meter r Oscilloscope r Spectrum Analyzer r Deviation Meter (linear detector) r AF Milivoltmeter r AF Dummy Load: 8-Ohm, 5 W r DC Voltmeter: high impedance r Inline Wattmeter with 5% accuracy at 500 MHz r 50-Ohm non-reactive Dummy Load:

100 watts at 500 MHz

r VHF/UHF Sampling Coupler Set up the test equipment as shown for the transceiver

alignment, and apply 13.8 VDC power to the transceiver.

Alignment Preparation & Precautions

A dummy load and inline wattmeter must be connected to the main antenna jack in all procedures that call for transmission, except where specified otherwise. Correct alignment is not possible with an antenna. After completing one step, read the following step to determine whether the same test equipment will be required. If not, remove the test equipment (except dummy load and wattmeter, if connected) before proceeding.

Correct alignment requires that the ambient temperature in the repair shop be the same as that of the transceiver and test equipment, and that this temperature be held constant between 68 °C and 86 °F (20 °C ~ 30 °C). When the transceiver is brought into the shop from hot or cold air it should be allowed some time for thermal equalization with the environment before alignment. If possible, alignments should be made with oscillator shields and circuit boards firmly affixed in place. Also, the test equipment must be thoroughly warmed up before beginning.

Notes: Signal levels in dB referred to in alignment are based on 0 dBµ = 0.5 µV.

Alignment

Entering the Alignment mode

Alignment of the FT-8900R is performed using a front-panel software-based procedure. To perform alignment of the transceiver, it must first be placed in the “Alignment Mode,” in which the adjustments will be made and then stored into memory.

To enter the Alignment mode:

1. Press and hold in the “Left” band [V/M] key and the

Hyper Memory [6] key while turning the radio on. Once the radio is on, release these two keys.

2. Press the front panel keys in the following sequence.

“Left” band [LOW] à “Left” band [V/M] à “Left” band [HM] à “Left” band [SCN] à “Right” band [LOW] à “Right” band [V/M] à “Right” band [HM] à “Right” band [SCN].

3. You will now note the appearance of “A-0 REF.xxH”

on the display, this signifies that the transceiver is now in the “Alignment” mode.

PLL Reference Frequency (A-0 REF)

1. Press the “Sub” band DIAL knob momentarily, if

needed, to switch the “Main” band to be the “Left” band.

2. Tune the “Left” band frequency to 52.050 MHz.

3. Press and hold in the in the “Right” DIAL knob, if

needed, to set the Alignment parameter to “A-0 REF.xxH.”

4. Press the PTT switch to activate the transmitter, and

adjust the “Right” DIAL knob, as needed, so that the counter frequency reading is 52.050 MHz (±10 Hz).

5. Press the “Right” DIAL knob momentarily to switch

the “Main” band to be the “Right” band.

6. Tune the “Right” band frequency to 435.050 MHz.

7. Press the PTT switch to activate the transmitter, and

adjust the “Left” DIAL knob, as needed, so that the counter frequency reading is 435.050 MHz (±100 Hz).

RF Front-end Tuning (A-1 TUN)

1. Connect the DC voltmeter to R1168 on the MAIN Unit,

then inject a 439.050 MHz signal at a level of +10 dBµ (with 1 kHz modulation @ ±3.5 kHz deviation) from the RF Signal Generator.

2. Press the “Sub” band DIAL knob momentarily, if

needed, to switch the “Main” band to be the “Right” band.

3. Tune the “Right” band frequency to 439.050 MHz.

4. Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “A-1 TUN.xxH.”

5. Adjust the “Left” DIAL knob, as needed, so that the DC voltmeter reading is 1.1 V.

6. Tune the “Right” band frequency to 145.050 MHz.

7. Inject a 145.050 MHz signal at a level of +10 dBµ (with 1 kHz modulation @ ±3.5 kHz deviation) from the RF Signal Generator.

8. Adjust the “Left” DIAL knob, as needed, so that the DC voltmeter reading is 1.2 V.

8. Press the “Left” DIAL knob momentarily to switch the “Main” band to be the “Left” band.

9. Connect the DC voltmeter to R1180 on the MAIN Unit.

10. Tune the “Left” band frequency to 439.050 MHz.

11. Inject a 439.050 MHz signal at a level of +10 dBµ (with 1 kHz modulation @ ±3.5 kHz deviation) from the RF Signal Generator.

12. Adjust the “Right” DIAL knob, as needed, so that the DC voltmeter reading is 1.1 V.

13. Tune the “Left” band frequency to 145.050 MHz.

14. Inject a 145.050 MHz signal at a level of +10 dBµ (with 1 kHz modulation @ ±3.5 kHz deviation) from the RF Signal Generator.

15. Adjust the “Right” DIAL knob, as needed, so that the DC voltmeter reading is 1.2 V.

R1168

R1180

MAIN UNIT TEST POINTS

Alignment

TX Power Output (A-2 PWR)

1. Press the “Sub” band DIAL knob momentarily, if

needed, to switch the “Main” band to be the “Right” band.

2. Tune the “Right” band frequency to 440.050 MHz, then set the Transmit Power Level to “LOW.”

3. Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “A-2 PWR.xxH.”

4. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 5 Watts (±0.5 Watt).

5. Increase the Transmit Power Level to “MID2.”

6. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 10 Watts (±0.5 Watt).

7. Increase the Transmit Power Level to “MID1.”

8. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 20 Watts (±0.5 Watt).

9. Increase the Transmit Power Level to “HIGH.”

10. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 35 Watts (±0.5 Watt).

11. Tune the “Right” band frequency to 146.050 MHz, then set the Transmit Power Level to “LOW.”

12. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 5 Watts (±0.5 Watt).

13. Press the “Left” DIAL knob momentarily to switch the “Main” band to be the “Left” band.

14. Tune the “Left” band frequency to 52.050 MHz, then set the Transmit Power Level to “MID2.”

15. Press the PTT switch to activate the transmitter, and adjust the “Right” DIAL knob, as needed, so that the wattmeter reading is 10 Watts (±0.5 Watt).

16. Tune the “Left” band frequency to 29.050 MHz, then set the Transmit Power Level to “MID2.”

17. Press the PTT switch to activate the transmitter, and adjust the “Right” DIAL knob, as needed, so that the wattmeter reading is 20 Watts (±0.5 Watt).

18. Increase the Transmit Power Level to “HIGH.”

19. Press the PTT switch to activate the transmitter, and adjust the “Right” DIAL knob, as needed, so that the wattmeter reading is 50 Watts (±0.5 Watt).

TX Deviation (A-4 DEV)

1. Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band.

2. Tune the “Right” band frequency to 440.050 MHz, then set the Transmit Power Level to “LOW.”

3. Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “A-4 DEV.xxH.”

4. Inject a 1 kHz audio tone at a level of 80 mV from the Audio Generator.

5. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is 4.5 kHz (±0.2 kHz).

6. Tune the “Right” band frequency to 146.050 MHz, then set the Transmit Power Level to “LOW.”

7. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is 4.5 kHz (±0.2 kHz).

9. Press the “Left” DIAL knob momentarily to switch the “Main” band to be the “Left” band.

10. Tune the “Left” band frequency to 52.050 MHz, then set the Transmit Power Level to “LOW.”

11. Press the PTT switch to activate the transmitter, and adjust the “Right” DIAL knob, as needed, so that the deviation meter reading is 4.5 kHz (±0.2 kHz).

12. Tune the “Left” band frequency to 29.050 MHz, then set the Transmit Power Level to “LOW.”

13. Press the PTT switch to activate the transmitter, and adjust the “Right” DIAL knob, as needed, so that the deviation meter reading is 2.3 kHz (±0.2 kHz).

DCS Tx Deviation (A-5 DCS)

1. Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band.

2. Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “A-5 DCS.xxH.”

3. Tune the “Right” band frequency to 440.050 MHz, then activate DCS with the 023 DCS code, and set the Transmit Power Level to “LOW.”

4. Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is between 0.50 kHz and 0.60 kHz.

5. Tune the “Right” band frequency to 146.050 MHz, then activate DCS with the 023 DCS code, and set the Transmit Power Level to “LOW.”

6. Press the PTT switch to activate the transmitter (with no microphone input), adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is between 0.50 kHz and 0.60 kHz.

7. Press the “Left” DIAL knob momentarily to switch the “Main” band to be the “Left” band.

8. Tune the “Left” band frequency to 52.050 MHz, then activate DCS with the 023 DCS code, and set the Transmit Power Level to “LOW.”

9. Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Right” DIAL knob, as needed, so that the deviation meter reading is between 0.65 kHz and 0.75 kHz.

10. Tune the “Left” band frequency to 29.050 MHz, then activate DCS with the 023 DCS code, and set the Transmit Power Level to “LOW.”

11. Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Right” DIAL

Alignment

knob, as needed, so that the deviation meter reading is between 0.35 kHz and 0.45 kHz.

CTCSS Tx Deviation (A-6 CTC)

1. Press the “Sub” band DIAL knob momentarily, if

needed, to switch the “Main” band to be the “Right” band.

2. Press and hold in the in the “Left” DIAL knob to set

the Alignment parameter to “A-6 CTC.xxH.”

3. Tune the “Right” band frequency to 440.050 MHz, then activate the CTCSS Encoder with a 100 Hz tone, and set the Transmit Power Level to “LOW.”

4. Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is between 0.65 kHz and 0.75 kHz.

5. Tune the “Right” band frequency to 146.050 MHz, then activate the CTCSS Encoder with a 100 Hz tone, and set the Transmit Power Level to “LOW.”

6. Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is between 0.65 kHz and 0.75 kHz.

7. Press the “Left” DIAL knob momentarily to switch the “Main” band to be the “Left” band.

8. Tune the “Left” band frequency to 52.050 MHz, then activate the CTCSS Encoder with a 100 Hz tone, and set the Transmit Power Level to “LOW.”

9. Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Right” DIAL knob, as needed, so that the deviation meter reading is between 0.65 kHz and 0.75 kHz.

10. Tune the “Left” band frequency to 29.050 MHz, then activate the CTCSS Encoder with a 100 Hz tone, and set the Transmit Power Level to “LOW.”

11. Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Right” DIAL knob, as needed, so that the deviation meter reading is between 0.35 kHz and 0.45 kHz.

S-Meter Sensitivity (A-7 SM L/V)

1. Inject a 440.050 MHz signal at a level of –5 dBµ from the RF Signal Generator.

2. Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band.

3. Tune the “Right” band frequency to 440.050 MHz.

4. Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “A-7 SM L/V.”

5. Press the “Left” band [LOW] key , then adjust the “Left” DIAL knob, as needed, so that the S-meter deflects 1 dot.

6. Increase the RF Signal Generator output level to +23 dBµ.

7. Press the “Left” band [V/M] key, then adjust the “Left”

DIAL knob, as needed, so that the S-meter deflects full

scale.

8. Tune the “Right” band frequency to 146.050 MHz.

9. Inject a 146.050 MHz signal at a level of –5 dBµ from the RF Signal Generator.

10. Press the “Left” band [LOW] key , then adjust the “Left” DIAL knob, as needed, so that the S-meter deflects 1 dot.

11. Increase the RF Signal Generator output level to +23 dBµ.

12. Press the “Left” band [V/M] key, then adjust the “Left” DIAL knob, as needed, so that the S-meter deflects full scale.

13. Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Left” band.

14. Tune the “Left” band frequency to 440.050 MHz.

15. Inject a 440.050 MHz signal at a level of –5 dBµ from the RF Signal Generator.

16. Press the “Left” band [LOW] key, then adjust the “Right” DIAL knob, as needed, so that the S-meter deflects 1 dot.

17. Increase the RF Signal Generator output level to +23 dBµ.

18. Press the “Left” band [V/M] key, then adjust the “Right” DIAL knob, as needed, so that the S-meter deflects full scale.

19. Tune the “Left” band frequency to 146.050 MHz.

20. Inject a 146.050 MHz signal at a level of –5 dBµ from the RF Signal Generator.

21. Press the “Left” band [LOW] key, then adjust the “Right” DIAL knob, as needed, so that the S-meter deflects 1 dot.

22. Increase the RF Signal Generator output level to +23 dBµ.

23. Press the “Left” band [V/M] key, then adjust the “Right” DIAL knob, as needed, so that the S-meter deflects full scale.

24. Tune the “Left” band frequency to 52.050 MHz.

25. Inject a 52.050 MHz signal at a level of –5 dBµ from the RF Signal Generator.

26. Press the “Left” band [LOW] key, then adjust the “Right” DIAL knob, as needed, so that the S-meter deflects 1 dot.

27. Increase the RF Signal Generator output level to +23 dBµ.

28. Press the “Left” band [V/M] key then adjust the “Right” DIAL knob, as needed, so that the S-meter deflects full scale.

29. Tune the “Left” band frequency to 29.050 MHz.

30. Inject a 146.050 MHz signal at a level of –5 dBµ from the RF Signal Generator.

31. Press the “Left” band [LOW] key, then adjust the “Right” DIAL knob, as needed, so that the S-meter deflects 1 dot.

32. Increase the RF Signal Generator output level to +23 dBµ.

Alignment

33. Press the “Left” band [V/M] key, then adjust the

“Right” DIAL knob, as needed, so that the S-meter deflects full scale.

34. Tune the “Left” band frequency to 868.95 MHz.

35. Inject an 868.95 MHz signal at a level of –3 dBµ from the RF Signal Generator.

36. Press the “Left” band [LOW] key, then adjust the “Right” DIAL knob, as needed, so that the S-meter deflects 1 dot.

37. Increase the RF Signal Generator output level to +31 dBµ.

38. Press the “Left” band [V/M] key, then adjust the “Right” DIAL knob, as needed, so that the S-meter deflects full scale.

39. Tune the “Left” band frequency to 350.050 MHz.

40. Inject a 350.050 MHz signal at a level of –5 dBµ from the RF Signal Generator.

41. Press the “Left” band [LOW] key, then adjust the “Right” DIAL knob, as needed, so that the S-meter deflects 1 dot.

42. Increase the RF Signal Generator output level to +23 dBµ.

43. Press the “Left” band [V/M] key, then adjust the “Right” DIAL knob, as needed, so that the S-meter deflects full scale.

DC Voltmeter (A-8 BAT SC)

1. Set the power supply voltage to 13.8 VDC.

2. Press and hold in the in the “Sub” band DIAL knob to set the Alignment parameter to “A-8 BAT SC.”

3. Press the “Left” band [SCN] key.

To close the Alignment mode, just press and hold in the “Right” VOL knob for 2 seconds (to turn the power off). The next time the transceiver is turned on, normal operation may resume.

Important Note!

The “A-3 PRO” (TX Protector) parameter is only used at the factory.

Do not adjust this parameter’s values.

Note

+1.8 dBµ

4.90 V

+0.3 dBµ

0 dBµ

0.88 V

+23.2 dBµ

-7 dBµ

4.90 V

4.15 V

+10.6 dBµ

0.98 V

8.70 V

+8.6 dBµ

+12.2 dBµ

0.41 V

+10.5 dBµ

+7.5 dBµ

0.77 V

+22.5 dBµ

+24.0 dBµ

2.27 V

0.17 V

8.45 V

8.47 V

+26.7 dBµ

3.57 V

8.70 V

1.55 V

8.94 V

+24.2 dBµ

1.14 V, +20.0 dBµ

8.94 V

0.71 V

+27.5 dBµ

8.97 V

8.70 V

1.00 V

1.48 V

1.55 V

8.94 V

1.08 V, +21.5 dBµ

1.54 V

1.00 V

8.22 V

<+29.7 dBµ> {+27.1 dBµ}

0.66 V

1.15 V

(+24.0 dBµ) [+25.3 dBµ]

(+30.6 dBµ) [+31.8 dBµ] <+32.4 dBµ> {+30.0 dBµ}

<4.70 V>

1.64 V

2.42 V

(4.87 V) [4.87 V]

0.36 V

0.79 V

0.46 V

0.20 V

1.20 V

2.26 V

2.44 V

0.69 V

0.78 V

0.20 V

0.68 V

2.09 V

0.61 V

<+30.8 dBµ>

0.70 V

0.85 V

2.44 V

0.78 V

4.55 V

4.70 V

(+33.2 dBµ) [+35.1 dBµ]

3.97 V

4.94 V

4.78 V

0.15 V

1.95 V

4.78 V

0.64 V

4.81 V

2.54 V

0.64 V

4.81 V

WIDE:2.25 V WIDE:2.25 V

WIDE:1.79 V

NARROW:2.54

WIDE:1.79 V

4.81 V

WIDE:4.04 V

PK-A:4.70 V

NARROW:4.66 V

1.80 V

PK-A:2.35 V

PK-B:2.28 V

PK-A:0 V, PK-B:4.54 V

0.80 V

0.78 V

9.00 V

PK-A:2.02 V

PK-A:1.48 V

0.86 V

0.83 V

1.80 V

1.81 V

9.00 V

0.82 V

0.79 V

1.85 V

1.86 V

1.85 V

1.86 V

PK-A:1.49 V

1.85 V

1.86 V

PK-A:2.36 V

0.88 V

0.85 V

9.00 V

0.88 V

0.85 V

0.88 V

0.85 V

PK-B

1.76 V

1.80 V

1.86 V

9.02 V

1.85 V

1.80 V

1.76 V

1.85 V

1.86 V

1.81 V

AFVR-B:0~4.66 V

3.67 V

8.54 V

3.67 V

1.81 V

4.64 V

AFVR-A:0~4.66 V

13.70 V

1.31 V

1.28 V

FAN ON:12.0 V

FAN ON:0.77 V

MAIN Unit

Circuit Diagram

13.77 V

13.00 V

6.21 V

9.07 V

0.52 V

(1.75 V) [1.92 V] <13.4 V>

<12.7 V>

<13.4 V>{13.2 V}

(3.17 V) <3.49 V>

4.64 V

4.67 V

8.94 V

9.01 V

5.06 V

8.95 V

8.81 V

5.09 V

5.11 V

8.99 V

5.11 V

9.01 V

9.02 V

POWER ON:13.77 V

9.08 V

5.84 V

5.19 V

5.14 V

5.12 V5.14 V

5.85 V

4.99 V

POWER ON:4.76 V

POWER ON:4.75 V

13.12 V

POWER ON:4.22 V

4.89 V

8.80 V

FAN ON:0.18 V

13.80 V

POWER ON:13.05 V

13.09 V

8.88 V

<0.92 V>

(2.50 V)

4.88 V

(xx) = 29.1 V [xx] = 52.1 V <xx> = 146.1 V

MAIN Unit

+ 40 hidden pages

Yaesu FT-8900R Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

Specifications

Connection Diagram

Circuit Description

Receiver Signal Path

Squelch Control

AF Signal

430 MHz Signal

144 MHz Signal

50 MHz Signal

430 MHz

144 MHz

50 MHz

29 MHz

430 MHz

144 MHz

50 MHz

28 MHz

PLL Circuit

Power Supply Line

Alignment

Introduction and Precautions

Required Test Equipment

Alignment Preparation & Precautions

Entering the Alignment mode

PLL Reference Frequency (A-0 REF)

RF Front-end Tuning (A-1 TUN)

MAIN UNIT TEST POINTS

TX Power Output (A-2 PWR)

TX Deviation (A-4 DEV)

DCS Tx Deviation (A-5 DCS)

CTCSS Tx Deviation (A-6 CTC)

S-Meter Sensitivity (A-7 SM L/V)

DC Voltmeter (A-8 BAT SC)

MAIN Unit

Circuit Diagram