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Motorola Spectra Mobile Radio HLN6094B Command Board Jumpers By Robert W. Meister WA1MIK

This information was obtained from the Spectra Detailed Service manual. The PDF files are incomplete and unsuitable for service work.

Note that some jumpers on the schematic or circuit board layout are identified with a leading zero digit, so you might find JU503 or JU0503. Motorola often uses leading zeroes for parts located on the bottom side of the circuit board, but they didn't follow that convention here. I've removed them in this table.

"Pg" refers to the page number of the printed schematic diagram, a 500kB PDF file that can be found here.

"S" refers to the side of the circuit board X-ray view / layout: top (T) or bottom (B), a 3.2MB PDF file that can be found here.

"Dflt" shows the default condition or value.

"Circuit" is my idea of the electronic functionality the jumper affects.

"See Also" identifies related jumpers that may need to be altered as a set.

"Near" gives you some help in physically locating the jumper.

Jumper	Pg	S	Dflt	Circuit	See Also	Near	Notes / Use
JU500	1	B	IN	PTT	508, 524	J502	IN FOR PTT
JU501	4		OUT	FUSED A+	F0500		IN TO BYPASS FUSE
JU502	1	T	IN	U522 SIO		U522	CONFIGURATION
JU503	1	B	OUT	CH. ACTIVE		U401	IN FOR CH. ACTIVE
JU505	2	B	IN	U520 CPU		MIDDLE	CONFIGURATION
JU506	2	B	IN	U521/MLM	512	J505	CONFIGURATION
JU507	4	B	OUT	DET AUDIO	9730	U401	IN FOR DET AUDIO
JU508	1	T	OUT	PTT/A+	500, 524	J502	IN FOR A+
JU509	1	B	OUT	RESET		J502	IN FOR RESET
JU510	4	B	OUT	IGN/SWB+		P503	IN FOR SWB+
JU511	4	B	OUT	MIC HI/GND	514, 515	P503	IN FOR GND
JU512	4	B	OUT	SPARE 1	506	J502
JU513	4	B	OUT	SPARE 2		J502
JU514	4	B	IN	MIC HI/GND	511, 515	U523	IN FOR MIC HI
JU515	1	T	OUT	RESET	511, 514	U522
JU516	1	T	OUT	EMERGENCY		U502	IN TO DISABLE
JU523	4	B	OUT	RX AUD / VO2		J502	IN FOR RX AUDIO
JU524	1	T	OUT	S.NET WE	500, 508	J502
JU709	2+3	B	IN	U700 SF		J502	CONFIGURATION
JU9730	4	B	IN	DET AUDIO	507	U401	IN FOR DET AUDIO
R0001	4	B	OUT	+5V	503	U401	IN FOR +5V
R9745	4	B	10K	TX AUDIO		J502	IN FOR TX AUDIO

NOTE: JU501 is shown on the schematic but not on the circuit board X-ray view. There were additional jumpers listed in a table on the schematic but they were not present on the schematic or the circuit board X-ray view and have been removed.

DISCLAIMER: The information presented herein is accurate to the best of my knowledge. The Notes / Use column is my interpretation of what the jumper seems to affect or be used for. There is no Motorola-published list of jumper configurations.

The author may be contacted at: his-callsign [ at ] comcast [ dot ] net.

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This page originally posted 14-Dec-09.