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  Motorola Spectra Mobile Radio
Command Board Jumpers

By Robert W. Meister WA1MIK
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This article covers the HLN6094B regular command board and the HLN6324A E-series command board. The information was obtained from the Spectra Detailed Service manual and the E-series command board addendum. The PDF files are incomplete and unsuitable for service work. The original article, created in December 2009, covered only the regular command board.

Note that some jumpers on the schematics or circuit board layouts 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 the leading zeroes from reference numbers in these tables.

Regular Command Board:

"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.

JumperPgSDfltCircuitSee AlsoNear Notes / Use
JU5001BINPTT508, 524J502 IN FOR PTT
JU5014 OUTFUSED A+F0500J502 IN TO BYPASS FUSE
JU5021TINU522 SIO U522 CONFIGURATION
JU5031BOUTCH. ACTIVE U401 IN FOR CH. ACTIVE
JU5052BINU520 CPU MIDDLE CONFIGURATION
JU5062BINU521/MLM512J505 CONFIGURATION
JU5074BOUTDET AUDIO9730U401 IN FOR DET AUDIO
JU5081TOUTPTT/A+500, 524J502 IN FOR A+
JU5091BOUTRESET J502 IN FOR RESET
JU5104BOUTIGN/SWB+ P503 IN FOR SWB+
JU5114BOUTMIC HI/GND514, 515P503 IN FOR GND
JU5124BOUTSPARE 1506J502  
JU5134BOUTSPARE 2 J502  
JU5144BINMIC HI/GND511, 515U523 IN FOR MIC HI
JU5151TOUTRESET511, 514U522  
JU5161TOUTEMERGENCY U502 IN TO DISABLE
JU5234BOUTRX AUD / VO2 J502 IN FOR RX AUDIO
JU5241TOUTS.NET WE500, 508J502  
JU7092+3BINU700 SF J502 CONFIGURATION
JU97304BINDET AUDIO507U401 IN FOR DET AUDIO
R00014BOUT+5V503U401 IN FOR +5V
R97454B10KTX AUDIO J502 IN FOR TX AUDIO

NOTES: 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.

E-series Command Board:

The E-series radios have a completely different command board. There is no jumper information on the schematic, but I have scanned several pages from the manual addendum and done all the work to locate them. This section was added in August 2014.

"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 4.5MB 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.

JumperPgSDfltCircuitSee AlsoNear Notes / Use
JU50131OUTAUDIO PAF1J502 BYPASS FUSE
JU50212INSIO / U8 (U8) CONFIGURATION
JU50331OUTACC CONN504, 518P503 MIC
JU50431OUTACC CONN503, 518P503 RESET
JU50522INTX AUDIO P503  
JU50611OUTCTL HEAD P503 A3 VOLUME
JU50711OUTCTL HEAD P503 A3 DATA IN
JU50811OUTCTL HEAD U7 CLOCK
JU50912OUTCTL HEAD J502 DATA
JU51011OUTCTL HEAD J502/U7 A3 VIP CNTL
JU51111OUTCTL HEAD J502/U7 A3 LOAD/SHIFT
JU51232INACC CONN513P503 VIP OUT 1
JU51332OUTACC CONN512P503 RXD-RS232
JU51431INACC CONN515, 521P503 VIP OUT 2
JU51531OUTACC CONN514, 521P503 TXD-RS232
JU51632INACC CONN517J502 DET/FILT AUDIO
JU51732OUTACC CONN516J502 RTS-RS232
JU51832OUTACC CONN503, 504P503 CTS-RS232
JU52021INTX PA ENABLE J500/U24  
JU52111OUTOPTION CONN514, 515P503 VO2 / TXD / RSSI
JU52211OUTOPTION CONN U16 RX SQ/DTMF DIG
JU52311OUTOPTION CONN P503 RX DATA IN/MISO
JU52412OUTOPTION CONN J502  
JU52511OUTOPTION CONN U16 DTMF LOAD/ASN

NOTES: JU501 is shown across F1. JU519 seems to be missing.

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.

Contact Information:

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

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This page originally posted 14-Dec-09.



Article text and hand-coded HTML © Copyright 2009 and 2014 By Robert W. Meister WA1MIK.

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.