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The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of Ericsson MPI-II VHF one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.
Unfortunately, only a few customers devote their time to read an instruction of Ericsson MPI-II VHF. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.
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First and foremost, an user manual of Ericsson MPI-II VHF should contain:
- informations concerning technical data of Ericsson MPI-II VHF
- name of the manufacturer and a year of construction of the Ericsson MPI-II VHF item
- rules of operation, control and maintenance of the Ericsson MPI-II VHF item
- safety signs and mark certificates which confirm compatibility with appropriate standards
Why don't we read the manuals?
Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Ericsson MPI-II VHF alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Ericsson MPI-II VHF, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Ericsson service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Ericsson MPI-II VHF.
Why one should read the manuals?
It is mostly in the manuals where we will find the details concerning construction and possibility of the Ericsson MPI-II VHF item, and its use of respective accessory, as well as information concerning all the functions and facilities.
After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.
Table of contents for the manual
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Page 1
Mobile Communicatio n s SER VICE SECT ION FOR M P I -I I VH F P E RS O NA L RA D I O Printed in U.S.A. Copyright January 1991, E ricsson G E Mobile C ommunications, Inc. Main tenance Ma n ual LB I-3 8557A Ericsson GE Mobile C o mmunications I n c . Mountain View Road • Lyn chburg, Virginia 24502[...]
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Page 2
INTRODUCTION This se r vice secti on c ontains the necessary information to ali gn and troublesh oot the MPI-II (1 36-174 MHz) Per- sonal Radio. This manual includes steps for disassembly and procedures for replacing surface mount components and integrated circuits. Preventive m ai ntenance checks are pro- vided as well a s battery service d ata. T[...]
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FRONT COVER 1. Remov e th e bat tery a s describ ed in the previo us section. 2. Remove the tw o scr ews at (A) ( S ee F igure 2). 3. Caref ull y lift the f ron t co ve r from the r ad io . 4. Unplug t he ca ble betw een the front cover MIC B oard and the T/R B oard . 5. To gai n acces s to the micropro ces sor, remov e the thre e scre w s at (B) a[...]
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Severa l tests are presented which will help isol ate a pos- sible RF o r control circuit problem. The control circuits , which are l ocated on the T / R Board, contain no adjustments and there is n o alignment required for the control circuits. See the Trou- bleshooting section for test i nformation if a problem i s sus- pected in the control circ[...]
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Figure 4 - Location of Tuning Controls and Test Points LBI-38557 LBI-38557 4[...]
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2. Check power on the lower channel . A djust C124 in the direction that increases powe r output to a level half way betw ee n t he i niti al low er a nd u p pe r ch an nel levels. 3. Rechec k the upper channel po wer. If the u pper ch annel power is r educe d , r eset to th e prev ious le vel by adjust- ing C126. 4. Repeat this procedu re until th[...]
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3. Check for proper operat ion of the synthesizer. Th ere should be approxim ately 0 dBm d rive level on the SYNTH output li ne for proper transmit operation. If a Syntheiszer problem is suspected, followin g the suggestions in Troubleshooting S ynthesizer s ection. 4. If curren t consump tion ap pears normal, a nd th e sy n- thes izer o utput lev [...]
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D.C. Analysis Battery voltage (7.5/10 V olts, B+) is supplied to a 5.4 volt regula t or circuit consisting of transistors Q801, Q802 and Q803. Diode re gulator U801 provides a 2.5 volt reference for this circuit. Battery voltage (B+) is also supplied to the Syn- thesizer Board for isolation a mplifie r U206. the 5.4 volt regu- lator s upplies both [...]
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SURFACE MOUNT COMPONENT REPLACEMENT 1. "Tin " one te rmina l en d o f the ne w compon ent an d the corresponding pad of the P WB. Use as little solder as possible. 2. Plac e th e com ponen t on th e PWB p ads, o bservin g prope r ori enta tio n for capa cito rs, diod es, transistors, etc. 3. Simult aneo us ly tou ch the "tinned"[...]
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2. A full ch arge c ycle using an appropria te Eric s so n GE charge r. 3. This p roce dure should be r epeated a gain. P erfor ming the rated discharge and charge cycle a t least twice should sufficiently rest or e the battery . MODIFICATION INSTRUCTIONS (Alternate IF Option) T o install the Alternate IF Option, follow the instructions shown below[...]