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Table of contents for the manual
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Page 1
LBI-38505A (Supercedes LBI-30025) T ABLE OF CONTENTS RF ASSEMBL Y , MIXER AND REFI L TE R BOARD . . . . . . . . . . . . . LBI-30 032 (DF110 7) OSCILLA TOR/MUL TIPLIE R BOARD . . . . . . . . . . . . . . . . . . . . LB I-30 029 (DF110 6) IF A UDIO AND SQUELCH BOARD . . . . . . . . . . . . . . . . . . . . LB I-38 507 Maintenance Manual MASTR ® II BA [...]
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Page 2
Copyright © May 1990, Eri csson GE M obile C ommunications Inc. T ABLE OF CONTENTS Page SPECIFICA TIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . .[...]
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Page 3
DESCRIPTION MASTR II Base Station, 406 to 512 mega hertz receivers are single co n version, superhe terodyn e FM recei vers design ed for one-th rough eight-freq uency op eration. T he solid state recei ver utilizes integrate d circuits (ICs), m onolithic crystal filter s a nd discrete c omponents with ea ch of the crystal f ilters located between [...]
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Page 4
T o remove the IF Filter board from the radi o: 1. Remove the eight screws (E) holding the IF Filter bottom cov er . 2. Remove the six scre ws (F) holding the IF Filter top cover . 3. R e move the th ree screws (G) and the C onnector (H ), and care fully pus h do wn on the top of t he boar d to a void dama gi n g t he f ee dthrough ca pa cito rs . [...]
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Page 5
FR ONT END ALIGNMENT EQUIPMENT REQUIRED 1. T est Set Mode ls 4EX3A11, 4EX8K12, or 20,000 ohms-per-V olt multimete r with a 1 V olt scale. 2. A 406-512 MHz signa l source. PRELIMIN AR Y CHECKS AND ADJUSTMENT S 1. Connect blac k plug from T est Set to Rece iver Centralized Met ering Jack J601, and red plug to system board met ering jack J905. Set met[...]
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Page 6
406-512 MHz MASTR II RECEIVER ICOM FREQ UENCY ADJUSTMENT First, check the frequency to determine if any adjustment is required. The frequency meas urement requires equipment with an absolute accurac y which is 5 to 10 times better than the tolerance to be maintained. When performing frequency m easurement, the entire r adio sho uld be as near as po[...]
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Page 7
ALIGNMENT PR OCEDURES COMPLETE RECEIVER ALIGNMENT EQUIPMENT REQUIRED 1. T est Set Model s 4EX3A11, 4EX8K12, or 20,000 ohms-per V olt multi meter with a 1- V olt scal e. 2. An 11.2 MHz signal s ource (T est Set Model 4EX9A10). Al so a 406-512 MHz signal source with a one-inc h piece of insulated wire no la rger than .065 inch dia meter connecte d to[...]
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Page 8
TEST PR OCEDURES These T est Proc edures are desi gned to h elp yo u to ser vice a recei ver that is operating---but not proper ly . The problems e n- countered could be low po wer , poor sensiti vity , distortion, limiter not operating properly , and low gain. By following the sequence of tes t ste ps sta rting with S tep 1, th e de fect can be q [...]
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Page 9
TR OUBLESHOO TING PR OCEDURES TEST PR OCEDURES TEST PR OCEDURES STEP 2 USABLE SENSITIVITY (12 dB SIN AD) If STEP 1 checks out properly , measure the rece i ver sensiti vity as follows: A. Apply a 1 000 microvolt, on frequency signal mod ulated by 10 00 Hz with 3. 0 kHz deviation to A 301-J1. B. W ith Function Switch o n Distortion Analyzer set to V[...]
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Page 10
TR O UBLESHOO TING PROC EDURES SQUELCHED UNSQUEL CHED NOISE SQ OUTPUT U605-2 0.2 VDC 9 .9V CAS U605-1 0.1 VD C 9.9V RX MUTE U605-14 0.2 VDC 9 .9V R U S U605-13 0. 2 VDC 4.9 V SQ DISABLE SW . INPUT U606-1 0.2 VD C 9.9V A UDIO GA T E SW . CONTR OL U606-11 0.2 VDC 9 .9V If Externa l Decoder is used (CG, DCG, T ype 99, etc .), RX Mute will remain low ([...]
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Page 11
TR O UBLESHOO TING PROC EDURES 406-512 MHz MASTR II RECEIVER LBI-38505 LBI-38505 10[...]
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Page 12
406-512 MHz MASTR II RECEIVER TR OUBLESHOO TING PR OCEDURES LBI-38505 LBI-38505 11[...]