Yaesu FT-817ND 技术手册：全模式HF/VHF/UHF对讲机

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"yaesu_vertex_ft-817nd_sm.pdf" 是一份关于八重洲（Yaesu）FT-817ND对讲机的维修手册，由VERTEX STANDARD CO., LTD.发布，旨在为专业技术人员提供必要的服务信息。八重洲FT-817ND是一款多功能全模式的HF、VHF、UHF车载对讲机。其主要特点和规格包括： 1. 频率范围广泛：涵盖100kHz-30MHz、50MHz-54MHz、76MHz-108MHz、87.5MHz-108MHz以及108MHz-154MHz等多个频段，同时支持144 MHz-148(146)MHz和430(420)MHz-450(440)MHz的VHF和UHF频段。 2. 可调节功率：最高可达5W，也可降至1.5W，适应不同环境和距离的通信需求。 3. 配备通话结束确认音和背景照明，方便用户在不同光照条件下操作。 4. 支持电池供电，标准电压为13.8VDC±15%，并且可在8V-16V范围内工作，电池续航时间超过3小时。 5. 设计紧凑，尺寸为165×138×38mm，重量为1170g，便于携带和安装。 6. 显示屏采用LED设计，黑色外观，增强视觉效果。 7. 具备一定的环境适应性，能在-10℃到60℃的温度范围内正常工作，以及在5%-90%湿度的工作环境中稳定运行。 8. 存储条件相对宽松，可在-40℃到70℃的温度和0%-90%湿度的环境中存放。该维修手册特别强调，由于设备内部包含表面贴装芯片组件，非专业人员尝试自行维修可能会导致永久性损坏，并可能使保修失效。主要电路板的每一面都根据主要组件类型进行了标识，以帮助专业技术人员进行故障排查和维修。手册内容涵盖了对讲机的主要内部设置和调整方法，但不涉及安装和基本操作，这些内容可以在配套的FT-817/FT-817ND操作手册中找到。对于配件的使用和维护，应参照各自的手册进行。综上，这份维修手册是针对 Yaesu FT-817ND 对讲机的专业技术指南，适合拥有电子设备维修技能的人员参考，以确保设备的正确维护和修复。

Alignment

The alignment procedure for the FT-817/FT-817ND involves

several steps requiring that the case be opened to gain

access to the components to be adjusted. These procedures

are described first in the pages to follow. A number of

alignment categories, however, may be accomplished

without opening the transceiver case, utilizing the Align-

ment Menu feature which allows adjustments to be ac-

complished using the front panel controls.

Please survey the pages to follow. Depending on the

problem(s) needing correction, you may be able to skip to

the software-based alignment section.

Use external DC input of +13.8 Volts via the rear panel

DC input jack, for all alignment steps.

Local Oscillator Adjustment

Reference Frequency Adjustment

1. Connect the frequency counter to Q1038 (pin 5).

2. Adjust trimmer capacitor TC5001 (on the REF-Unit) for

a reading of 67.875 MHz (±10 Hz) on the frequency

counter.

3. Connect the RF millivoltmeter or an oscilloscope to

J5002 (pin 2) and confirm that the output level is at

least 60 mVrms or 169 mVp-p.

J5002

(

Pin 2

)

TC5001

T2003

T2002

T2001

L2010

J2002

(

Pin 6

)

L2011

J2002

(

Pin 11

)

J2002

(

Pin 1

)

Q1038 (pin 5)

PLL Adjustment

VCO VCV Adjustment

Connect the DC voltmeter to J2002 (pin 6) and referring

to the table below, tune the transceiver to each frequency

listed. Then confirm that the correct voltage is present, or

adjust the listed components for the required voltage.

Tune to : Adjust/Confirm For

13.895 MHz, CW mode Adjust T2001 4.5 V ±0.2 V

76.000 MHz, CW mode Confirm At least 0.5 V

29.995 MHz, CW mode Adjust T2002 4.5 V ±0.2 V

13.900 MHz, CW mode Confirm At least 0.8 V

53.995 MHz, CW mode Adjust T2003 4.5 V ±0.2 V

88.000 MHz, CW mode Confirm At least 0.8 V

146.000 MHz, CW mode Adjust L2010 4.6 V ±0.2 V

144.000 MHz, CW mode Confirm At least 0.5 V

440.000 MHz, CW mode Adjust L2011 4.6 V ±0.2 V

430.000 MHz, CW mode Confirm At least 0.4 V

Alignment

Local Oscillator Adjustment

Local Adjustment

1. Connect the RF millivoltmeter or an oscilloscope to

Q1038 (pin 5).

2. Adjust T1024 and T1026 alternately for maximum in-

dication on the millivoltmeter or for maximum ampli-

tude on the oscilloscope.

3. Confirm the indicated voltage is at least 120 mVrms or

330 mVp-p.

Local Adjustment

1. Connect the RF millivoltmeter or an oscilloscope to pin

5 of Q1055.

2. Key the transceiver in the CW mode, and adjust T1021

for maximum indication on the RF millivoltmeter.

3. Confirm that the indicated voltage is at least 70 mVrms

or 200 mVp-p.

TX IF Adjustment

CW TX IF Adjustment

1. Tune the frequency to 1.8 MHz in the CW mode. Con-

nect the RF millivoltmeter to J1002, terminated by a 50

Ohm dummy load.

2. Key the transceiver, and adjust T1020, T1012, and T1005

alternately for maximum indication on the RF

millivoltmeter.

FM TX IF Adjustment

1. Tune the frequency to the 29 MHz band in the FM

mode. Leave the RF millivoltmeter connected to J1002,

still terminated by the 50 Ohm dummy load.

2. Key the transceiver, and adjust T1012 and T1013 alter-

nately for the maximum indication on the RF

millivoltmeter.

3. Tune the frequency to the 144 MHz band in the FM mode.

4. Again key the transceiver in the FM mode (without

microphone audio input). Adjust T1018 for a reading

of ±100 Hz on the frequency counter.

Carrier Balance Adjustment

1. Terminate J1002 with a 50 Ohm dummy load, and con-

nect a spectrum analyzer or a RF millivoltmeter to

J1002.

2. Key the transceiver in the USB mode on the 28 MHz

band (without microphone input). Adjust VR1001 for

the maximum carrier suppression on the spectrum ana-

lyzer, or for the minimum indication on the RF

millivoltmeter.

VHF TX BPF Adjustment

1. Set the frequency at 145.995 MHz. Connect the RF

millivoltmeter to J1002 terminated by a 50ohm dummy load.

2. Key the transceiver on FM mode and adjust T1011,

T1010, and T1009 alternately for the maximum indica-

tion on RF millivoltmeter.

UHF TX BPF Adjustment

1. Set the frequency to 439.995 MHz. Connect the RF

millivoltmeter to J1002, which still should be termi-

nated by the 50 Ohm dummy load.

2. Key the transceiver in the FM mode, and adjust TC1005,

TC1004 and TC1002 alternately for maximum indica-

tion on the RF millivoltmeter.

RX Adjustment

The PA Unit must be connected during RX adjustment.

Note that the signal generator should not be connected to

J1008 (pin 15) because DC voltage is present there.

RX IF Adjustments

Connect the signal generator to the antenna connector,

and a SINAD meter to the speaker jack.

SSB IF Adjustment

1. Connect the DC voltmeter to J1008 (pin 15).

2. Tune the transceiver to 51.995 MHz. Inject an RF signal

from the signal generator at a level of 40 dBµ.

3. Adjust T1033, and T1029 alternately for the minimum

indication on the DC voltmeter.

4. Now select the FM mode. Turn off the RF injection from

the signal generator output.

5. Adjust T1034 for maximum indication on the DC volt-

meter.

FM IF Adjustment

1. Tune the transceiver to 51.995 MHz. Inject an RF signal

from the signal generator at a level of 10 dBµ, with 1

kHz of FM modulation at ±3.5 kHz deviation.

2. Adjust T1023, T1025, T1028, T1030 and T1034 alter-

nately for the best SINAD sensitivity.

VHF Band Alignment

1. Connect the DC voltmeter to J1008 (pin 15).

2. Tune the transceiver to 145.995 MHz. Inject an RF sig-

nal from the signal generator at a level of 40dBµ.

3. Adjust T1002, T1004, and T1008 alternately for the

minimum indication on the DC voltmeter.

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