Document Copyrights; Disclaimer; Circuit Description; Outline - Kenwood TM-D710A Service Manual

TM-D710A/D710E

Document Copyrights

Copyright 2007 by Kenwood Corporation. All rights
reserved.
No part of this manual may be reproduced, translated,
distributed, or transmitted in any form or by any means,
electronic, mechanical, photocopying, recording, or
otherwise, for any purpose without the prior written
permission of Kenwood.

1. Outline

TM-D710A/D710E and TM-V71A/V71E have a common
main unit. Thus, the main unit fi rmware is also common to
both.
The command formats of the panel connected to the
main unit are different for TM-V71A/V71E and TM-D710A/
D710E. So, the main unit section MPU (IC918) judges the
type of the panel connected, when power is turned on and
communication starts.
2. Frequency Confi guration
The TM-D710A/D710E has an individual VCO and PLL
unit for both band A and band B. Using these separate VCO
and PLL circuits, it can receive 2 separate bands at the
same time. You can also perform full-duplex operation.
The band A VCO is used for the following functions:
(i) VHF/UHF transmission
(ii) The first local oscillator for the band A (VHF)
reception.
2

Disclaimer

of this manual, Kenwood assumes no responsibility for
errors or omissions. Neither is any liability assumed for
damages resulting from the use of the information contained
herein. Kenwood reserves the right to make changes to any
products herein at any time for improvement purposes.

CIRCUIT DESCRIPTION

(band A) and a 16.8MHz (band B) crystal oscillator connected
to the band A and band B PLL ICs. This reference frequency
is used for both PLL circuits. The 45.505MHz second local
oscillator for band A is generated by the FM IC crystal
oscillator circuit. The second local oscillator for the band B
uses the tripled 16.8MHz reference oscillator frequency.
Note:
The PCB layout and the mounting parts are the same for the
band A VCO (X57-731 B/6) and band B VCO (X57-731 C/6),
although the PCB silk print is different.
While every precaution has been taken in the preparation
(iii) The first local oscillator for the band A (UHF)
reception.
The band B VCO is used for the following functions:
(i) VHF/UHF transmission
(ii) The first local oscillator for the band B (VHF)
reception.
(iii) The first local oscillator for the band B (UHF)
reception.
The PLL reference frequency is generated by a 12.8MHz