Transcript
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.
VX-820 Series
YAESU EUROPE B.V. P.O. Box 75525, 1118 ZN Schiphol, The Netherlands
VHF Band Service Manual ©2005 VERTEX STANDARD CO., LTD.
YAESU UK LTD. Unit 12, Sun Valley Business Park, Winnall Close Winchester, Hampshire, SO23 0LB, U.K.
VERTEX STANDARD HK LTD. EC058N90A
Unit 5, 20/F., Seaview Centre, 139 141 Hoi Bun Road, Kwun Tong, Kowloon, Hong Kong
Introduction This manual provides the technical information necessary for servicing the VX-820 Series Transceiver. Servicing this equipment requires expertise in handing 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 board in this transceiver. Each side of the board is referred to by the type of the majority of components installed on that side (“Side A” or “Side B”). In most cases one side has only chip components (surface-mount devices), and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only. As described in the pages to follow, the advanced microprocessor design of the VX-820 Series Transceiver allows a complete alignment of this transceiver to be performed without opening the case of the radio; all adjustments can be performed from the front panel, using the “Alignment Mode” menu. While we believe the 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 Block Diagram .................................................................................................................................................... 5 Circuit Description ............................................................................................................................................. 7 Alignment .......................................................................................................................................................... 11 Board Units (Schematics, Layouts & Parts) Main Unit .................................................................................................................................................... 15 Display Unit ................................................................................................................................................ 33 Cable Unit.................................................................................................................................................... 41
Specifications General Frequency range: Channel / Group: Channel Spacing: PLL Stepping: Power Supply Voltage: Current Consumption: (Approx. @7.4 V)
Battery Life (Approx.): Operating Temperature Range: Frequency Stability: Case Size (W x H x D): Weight (Approx.):
134-174 MHz 16 CH / 1 Group (w/o LCD version) 512 CH / 32 Groups (w/ LCD version) 12.5/15/20/25/30 kHz 1.25/2.5/5/6.25/7.5 kHz 7.4 V 30 mA (Standby w/saver) 75 mA (Standby) 200 mA (Receive) 1.7 A (Transmit) 7 hours (w/ FNB-V86LI) 12 hours (w/ FNB-V87LI) –22 °F to +140 °F (–30 °C to +60 °C) ±2.5ppm 2.2” x 3.8” x 1.48” (56 x 96.5 x 37.5 mm) 10.9 oz (310g) (w/FNB-V86LI, ATV-8B, CLIP-920)
Receiver (Measurement per TIA/EIA-603) Double Conversion Super-heterodyne 0.25 µV/0.32 µV(W/N) 75/70 dB (W/N) 75/70 dB (W/N) 75 dB 48/42 dB (W/N) 700 mW @ 16 ohms 5% THD –57 dBm
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Circuit Type: Sensitivity (12dB SINAD): Adjacent Channel Selectivity: Intermodulation: Spurious Response Rejection: Num & Noise: Audio output: Spurious Emissions:
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Transmitter (Measurement per TIA/EIA-603)
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RF Power Output: Modulation Type: Maximum Frequency Deviation: FM Hum & Noise: Audio Distortion: Spurious Emissions:
5/2.5/1/0.25 W Direct FM (16K0F3E/11K0F3E) ±2.5/±4.0/±5.0 kHz 45/40 dB (W/N) Less than 3% @ 1kHz –36 dBm @under 1 GHz –30 dBm @above 1 GHz
Specifications subject to change without notice or obligation.
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