Product Support Bulletin 847 - Revision history

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[[Category:Quantar Service Bulletin]]

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<B><FONT FACE="HELVETICA" SIZE=2><P>LAND MOBILE PRODUCT SECTOR </P>
<P>1301 E. ALGONQUIN RD. SCHAUMBURG, IL. 60196 </P>
<P>(847) 576-0180 </P>
<P>PSB # 847</P>
<P>APC # 448,509,225,360,590,675,537,301,482,409,218,676 </P>
<P>DATE: SEPTEMBER ,1998</P>
<P>EXPIRES: 9/30/99</P>
</FONT><U><FONT FACE="Arial"><P>SUBJECT:</B></U> QUANTAR/QUANTRO STATIONS DRIFTING OFF FREQUENCY </P>
<B><U><P>MODELS AFFECTED</U> : </B>All T5365A QUANTAR/QUANTRO STATIONS THAT INCLUDE THE UHSO (ULTRA HIGH STABILITY OSCILLATOR) OPTION X873</P>
<B><U><P>SYSTEMS AFFECTED</U> : </B>CONVENTIONAL AND TRUNKING</P>
</FONT><B><U><FONT FACE="Arial" SIZE=2><P>ISSUE:</P>
</B></U></FONT><FONT FACE="Arial"><P>The Receiver and Transmitter will drift off frequency by approximately 30Khz. Station alarms may or may not be generated to let the user know of the fault.</P>
</FONT><B><U><FONT FACE="Arial" SIZE=2><P>CAUSE:</P>
</B></U></FONT><FONT FACE="Arial"><P>Marginal power out of the ovenized oscillators will cause a miscount of the 5Mhz pulses. The result will be that the 5Mhz reference frequency will be counted as a lower frequency and the Pendulum IC will fail to lock on to the reference frequency.</P>
</FONT><B><U><FONT FACE="Arial" SIZE=2><P>RESOLUTION:</P>
</B></U></FONT><FONT FACE="Arial"><P>On the TTN5070C module change the value of R609 from 10K ohms to 2.7K ohms P/N 06-11079A84 and change the value of R611 from 56 ohms to 39 ohms P/N 06-11079A40 (Diagram 1).</P>
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<B><U><P>NOTE:</B></U> </FONT><FONT FACE="Arial">The above referenced resistors can be obtained at no charge from the Americas Parts Department by calling 1-800-422-4210 and making reference to this bulletin.</P>
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<P>Authorized Motorola Service Shops will be allowed 1 hour per station to change the resistors and check out station operation by making reference to this bulletin and entering the standard labor claim form RO21-19.</P>
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</FONT><FONT SIZE=2><P>Front of Board</P>
<P>																														 																																																				 			 </FONT><B><FONT SIZE=4>R609</FONT><FONT SIZE=2>																																		</B></FONT><FONT SIZE=5>E400							 </FONT><FONT SIZE=2>Q601	 Q602																									</FONT><B><FONT SIZE=4>R611</FONT><FONT SIZE=2>	 </B>R615																																																			 			 C610	 															 C611															</P>
<P>J101																																																																																																																										 									 </FONT><FONT SIZE=5>Y600</P>
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<P>						DIAGRAM 1</P>
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