Manuale d’uso / di manutenzione del prodotto SP-300 del fabbricante Midland Radio
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SP -300 Series SERVICE MANUAL Maxon Am erica, In c. 10828 N.W . Airwor ld Dr . Kansa s City , MO 64153 T el : 816-891- 6320 Fax: 816-891 -8815 Part Num ber: 680 -100-0 155 April 20 01.
MAXON SP-300 HAND HELD Page -i- May 2 001 TABLE OF CONTENTS SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MAXON SP-300 HAND HELD Page -i i- May 2 001 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Exploded View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page - 1- May 2 001 MAXON SP-300 HAND HELD SPECIFICA TIONS GENERAL Equipment T ype . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hand portable Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MAXON SP-300 HAND HELD Page - 2- May 2 001 FREQUENCY BA NDS RX TX VHF: V2 148.00 0 - 174.000 MHz 14 8.000 - 17 4.000 MHz UHF: U2 440.00 0 - 470.000 MHz 44 0.000 - 47 0.000 MHz DIMENSIONS Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page - 3- May 2 001 MAXON SP-300 HAND HELD T ransmitter Audio Distorti on (W ithout CTCSS) . . . . . . . . . . . . < 5% @ 1 kHz Hum & Noise: 12.5 kHz Chan nel Sp acing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 40 dB (with PSOPH) 25 k Hz Ch annel Spac ing .
MAXON SP-300 HAND HELD Page - 4- May 2 001 RX TONE DEMODULA TION CHARACT ERISTICS SUBAUDIO TONES - CTCSS T o ne Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Hz to 250.3 Hz Non-Stan dard T ones . . . . .
MAXON SP-300 Series HAND HELD Page - 5- May 200 1 SP-300 The SP-300 Series of portable radios from Maxon, utilizes the latest technolo gy in its desi gn and manuf acturing. Both the VHF and UHF models are PLL (Phase Lock Loop Syn- thesizer) / m i cropr ocessor con t rolle d, and of fer 1 or 5 watts of power with 4 & 16 channel capability .
MAXON SP-300 HAND HELD Page -6 - May 2 001 A priority chan nel can be selected while programming the radio. A pr i ority chan nel is a channe l that can be per iod i- cally checked or lo oked back to while rec ei ving on an y chan- nel in the scan list, or in normal operation.
MAXON SP-300 Series HAND HELD Page - 7- May 200 1 VCO Lock Time The micro will allow more lock time for the VC O before the out-of -lock beep indication. Low Ba tter y Indic ation Low Battery Indication will be changed so that it does not inhibit RX and will allow one transmission after low cell is indicated.
MAXON SP-300 HAND HELD Page - 8- May 2 001 The controls, indicators and antenn a connections on the VHF and UHF Scanning Handheld Series rad ios are all located on the top panel. The accessories socket is located on the rad io chassis right han d side.
MAXON SP-300 HAND HELD Page - 9- May 2 001 THEO R Y OF OP ERA TIO N The VHF and UHF scanning handheld series radio s are com- prised of one main PCB. The main PCB contains the trans- mitter , recei ver and control circuits. The cont rol circuits contain the micro co ntroller and associated digital circuits.
MAXON SP-300 HAND HELD Page -10- May 2 001 Mute (squelch) Circuit The mute circuit which is contro lled by the output of I C409 (micro) Pin 77 (386EN) is con nected to Q34 via R122 which mutes t he LM386IC on t he RF cir cuits. Pin 77 also control s IC402B which mutes the audio path to th e RF circuits.
MAXON SP-300 HAND HELD Page -11- May 2 001 RF CIRCUITS PLL S YNTHESIZER 12.8 MH z TCXO The TCXO contains the 3 -stage thermistor network compen- sation an d crystal oscilla tor and modulati on ports . Compen- sation i s +/-5 PPM or l ess f rom -30c to +60c.
MAXON SP-300 HAND HELD Page -12- May 2 001 filters provide the adjacent channel selectivity o f 25 kHz or 12.5 kHz bandwidt h. Squelch (mute) Circuit The squelch circuit switches of f t he power amplif ier when no audio si gnal is present. The squelch circuit consist s of a 16 kHz band pass filter and a noise detector circu it .
Page -13- May 2 001 MAXON SP-300 HAND HELD MAINTENANCE AND REP AIR GENERAL Any r epair or ad jus tment shoul d onl y be m ade b y or un der the supervision o f a qualified radio serv ice technician.
Page -14- May 2 001 MAXON SP-300 HAND HELD REMOVING & REPLACING THE BA TTER Y T o remove the battery: 1. Holding t he radio chassis i n one hand, press and hold the battery releas e catch on the u pper back of the radio wi th t he other ha nd. 2. Pull the battery back and away from the radio.
Page -15- May 2 001 MAXON SP-300 HAND HELD 2. By placing thumb under bot tom of the P TT assembly and ge ntly pul ling out ward, un plug P TT Assembl y from Main Board. T o rep lace the P TT assembly : 1. Reverse the steps taken to remove the P TT assembly .
Page -16- May 2 001 MAXON SP-300 HAND HELD REMOVING & REPLACING THE BACK COVER T o remo ve the Back Co ver: 1. Remove battery . (Refer to Removing & Replacing the Battery) 2. Unsc rew the four Back Co ver m ountin g scr ews located on the B ack Cover of the radio.
Page -17- May 2 001 MAXON SP-300 HAND HELD REMOVING & REPLACING THE MAIN BOARD T o remov e the Main Board: 1. Remove the Battery (Refer to Removing & Replac- ing the Battery). 2. Remove the P TT Assembly ( R efer to Removing & Replacing t he P TT Assembly).
Page -18- May 2 001 MAXON SP-300 HAND HELD T o rep lace the M ain Board 1. Reverse the steps taken to remove the Main Board. 2 . When installing the Main Board into the chassis insure that the LED light guid e is aligned properly .
MAXON SP-300 HAND HELD Page -19- May 2 001 REMOVING & REPLACING THE DAUGH- TER BOARDS The Daughter Board s are soldered into th e Main Board Assy . 1. Remove the Main Board (Refer to R emoving & Replacing the Main B oard). 2. Unsolder the appropriate Daugh t er Board from the Main Board Assembly .
MAXON SP-300 HAND HELD Page -20- May 2 001 4. It may be necessar y to r emove excess solder using a vacuum de-sold ering tool or Solder wick . Again, use great car e when de-so ldering or s o ldering o n the printed circuit board s.
MAXON SP-300 HAND HELD Page -21- May 2 001 PROGRAMMING The SP-300 Series portabl e radios require th e ACC-2300 programming cable. W ith the 25 pin “D” typ e connector installe d on the comput er , take the other en d of the program- ming cable and insert it in the receptacle located on the opposite s ide of the P TT on the radio.
MAXON SP-300 HAND HELD Page -22- May 2 001 15. Disconnect the test equipment. Should repairs be required, the following procedures should be ap plied: RX VCO 1. Set the unit t o the highest receive freq uency , 470 MHz(UHF), 174MHz(VHF) and adjust the VCO L303 to 10 volts .
MAXON SP-300 HAND HELD Page -23- May 2 001 TEST EQUIPMENT SETUP 154.625445681125661 W ATT METER 20dB AUDIO MODULA TION- METER AUDIO GENERA TOR DC POWER SUPPL Y RADIO OSCILLOSCOPE SPECTRUM ANAL YZER FREQUENCY COUNTER VOL T METER DC POWER SUPPL Y RADIO OSCILLOSCOPE SINAD METER DISTORTION METER SSG 3K Dev @ 1K (25 kHz Channel Spacing) 1.
MAXON SP-300 HAND HELD Page -24- May 2 001 ALIGNMENT POINTS DIAGRAM ALIGNMENT POINTS VHF & UHF WITH TCXO MODULE ALIGNMENT POINTS UH F WITH OUT TCXO MODULE RV2 RV4 T1 RV1 RV3 TCXO1 TC7 01 L203 L303.
MAXON SP-300 HAND HELD Page -25- May 2 001 TROUBL ESHO OTING GUIDE SYMPTOMS CAUSES COUNTER MEASURES 1. Complete discharge of battery (7.5v+/-10%) 1. Replace battery Unit does not Work 2. Fuse blown up (4a) 2. Replace fuse 3. 5v voltage source 3. IC1 (5v+/-0.
MAXON SP-300 HAND HELD Page -2 6- May 2 001 VOL T AGE CHARTS z NOTE: Q402 an d Q409 are not fitted on this model series . z NOTE: Q9, 10, 15 , 19, 20, 23 and 28 - 32 are not fitted on this model series . z NOTE: ~ indicates approximate voltage. Actual v oltage may vary .
Page -27- May 2 001 MAXON SP-300 HAND HELD z NOTE: IC4, 403 and 405 are not fitted on this model series. RECEIVE ST A TE PIN # IC1 IC2 IC3 IC5 IC6 IC401 IC402 1 GND 1.6 - 4.0 1.4 0.0 0.0 2 GND 5.0 - 3.5 GND 1.0 0. 0 3 GND 5.0 - 4.0 0.0 1.3 AUDIO 4 5.0 5.
MAXON SP-300 HAND HELD Page -2 8- May 2 001 TRANSMIT ST A TE PIN # IC1 IC2 IC3 IC5 IC6 IC401 IC402 1 GND 1.6M 0.0 - 1.3 1.9 0.0 2 GND 5.0 0. 0 - GND 1.9 0.0 3 GND 5.0 0. 0 - 0.0 1.9 0.0 4 5.0 5. 0 GND - GND 1.9 0.0 5 GND 5.0 - - 1.5 0.0 0.0 6 7.5 0. 0 - - 7.
MAXON SP-300 HAND HELD Page -29- May 2 001 SP-300 SERIES UHF & VHF DIGIT AL SECTION P A RTS LIST RE F# DE SC RI PT IO N P AR T# DIGIT AL SECTION VHF& UHF (C OMMON P ARTS) PTT SWIT CH BOARD (SEE NO TE1) 650- 180-001 7 FUSE BOARD ASSY 650-200-0004 C136 CAP ,T A, 100UF 2 93D107X 0006E2T6V 102-013-3 107 C400 CAP ,CER, 0.
MAXON SP-300 HAND HELD Page -30- May 2 001 RE F# DE SC RI PT IO N P AR T# Q413 TRAN S,BRT ,N PN,KRC104 S,SOT -23,SW ,ND 8 70-020-0 001 Q416 TRANS,BRT ,PNP ,KRA1 10SPK,SOT-23,SW ,PK 870-010- 0010 Q417 .
MAXON SP-300 HAND HELD Page -31- May 2 001 SP-300 SERIES VHF RF SECTION P ARTS LIST RE F # DE SC RIP TI ON P AR T # REPLACEMENT MODULES FRONT ENDASSY , VHF(SEE NOTE 1) 650-1 10-0012 VCOTX/RX ASSY , VHF (SEE NOTE 1) 650-030-0021 POWERAMP ASSY , VHF(SEE NO TE 1) 650-230-0012 TCXO ASSY , VHF(SEE NOTE 1) 650-100-0002 COMPONENTS C1 CAP ,CER, 0.
MAXON SP-300 HAND HELD Page -32- May 2 001 RE F # DE SCR IP TI ON P AR T # C128 CAP ,T A, 10UF , 20%,16V ,32 16 102-02 3-1 106 C129 CAP ,ELE,1 0UF , 16V20%3X5 5.0PT 081-03 2-3106 C131 CAP ,CER ,0.01UF ,5%,5 0V ,X 7R,0603 1 00-521-1 1 03 C132 CAP ,T A, 4.
MAXON SP-300 HAND HELD Page -33- May 2 001 RE F # D ES CR IP TI ON P A RT # R31 RES,TF ,300,1/ 16W ,5%,T 1 608 741-10 2-130 1 R32 RES,TF ,300,1/ 16W ,5%,T 1 608 741-10 2-130 1 R33 RES,TF , 3.3K,5% ,1/16W,+/-200,0603 7 41-102-1 332 R34 RES,TF , 18,1/1 6W , 5% ,T 1608 741-102-1 180 R36 RES,TF , 0,5%,1/1 6W , +/-200,0 603 741-102-1 000 R37 RES,TF , 3.
MAXON SP-300 HAND HELD Page -34- May 2 001 SP-300 SERIES UHF RF SECTION P ARTS LIST RE F # DES CR IPT IO N P AR T # REPLACEMENT MODULES FRONT ENDASSY , UHF (SEE NOTE 1) 650 -1 10-0013 VCOTX/RX ASSY , .
MAXON SP-300 HAND HELD Page -35- May 2 001 RE F # D ES CR IP TI ON P A RT # C127 CAP , CER, 0.01UF ,5%,50 V ,X7R ,0603 100-521-1 103 C128 CAP , T A, 4. 7UF ,20%,1 0V ,3216 102-0 23-0475 C129 CAP , EL E,10UF ,16V 20% 3X5 5.0 PT 0 81-032-3 106 C131 CAP , CER, 0.
MAXON SP-300 HAND HELD Page -36- May 2 001 RE F # DES CR IP TI ON PART # R25 RES,TF , 4.7K,5% ,1/16W,TC250,0603 741-10 7-1472 R26 RES,TF , 18,1/1 6W , 5% ,T 1608 741-102-1 180 R27 RES,TF , 4.
MAXON SP-300 HAND HELD Page -37- May 2 001 RE F# DE SC RI PTI O N P AR T# TCXO TCX O, KXN134 3A,12.8 M,2.0PPM 150-00 0-0003 TH1 THERM ,33K,N TCCS321 63SH333K C 700-0 50-0002 U3 IC, OP AMP ,LM3 58M,SO-8,DUA L OP AMP 441-030 -0006 U6 IC, AUDIO AMP ,LM386 M-1,0 .
MAXON SP-300 HAND HELD Page -3 8- May 2 001 COMPONENT PINOUT BASE DIAGRAM MANUFACTURER'S PART NUMBER REFERENCE NO. SCHEMATIC Q202,203,302,303,601 2SC5084 MMBR951 Q16,17,501,601 BFR92A Q12,16,25 K.
Page -39- May 2 001 MAXON SP-300 HAND HELD BASE DIAGRAM MANUFACTURER'S PART NUMBER REFERENCE NO. SCHEMATIC D9 ND433G B C E KTA1663 Q22 Q502 BLT50 E C B BLT52 Q503 54 3 2 1 6 7 8 1 2 3 1.BASE 2.COLLECTOR 3.EMITTER 3.EMITTER 4.COLLECTOR 2.BASE 3 2 1 4 1.
MAXON SP-300 HAND HELD Page -4 0- May 2 001 PIN DESCRIPTION 1 BASE DIAGRAM Input GND 2 3 Vcc (Pre Drive) Vcc Control (Drive) 4 5 Vcc (Final) Output 6 7 GND No Description 6 Output GND 5 4 B (4V) 2 GND.
PAGE - 41- May 2001 SCHEMA TICS & BLOCK DIAGRAM VHF FRONT-END (148- 174M Hz Ba nd Shown ) Schematic P /N: 77 0-110- 0012 Rev . C PCB Assy . P/N: 650-11 0-0012 Rev C Notes: 1. ALL V ALUES ARE IN OHMS, MICROHENRI ES OR MICROF AR- ADS UNLESS OTHERW ISE SPECI- FIED.
PAGE -42 - May 20 01 VHF V .C.O. (148- 174MH z Band Show n) Schemati c P/N: 7 70-030-00 21 Rev . B PCB Ass y . P/N: 650- 030-0021R ev . B UHF V .C.O. (440-470MH z Band Shown) Schemati c P/N: 7 70-030-0018 R ev . D PCB Assy . P/N : 650-03 0-0020 Rev . A Notes: 1.
PAGE - 43- May 2001 Notes: 1. ALL V ALUES ARE IN OHMS, MICROHENRI ES OR MICROF AR- ADS UNLESS OTHERWISE SPECI- FIED. 2. ALL RESISTORS ARE 1/10W 5% UNLESS OT HER WISE SPECIFIE D. TCXO Schemati c P/N: 7 70-100-0002 R ev . D PCB Assy . P/N : 650-10 0-0002 Rev .
PAGE -44 - May 20 01 Digital Sc hematic 1 2 3 4 5 6 7 8 9 10 11 12 VOLUME P/S 5V 386 EN N/S SW SPK CHARGE PWR H/L ALERT AUDIO PLL EN LOCK D/T RX EN TX EN BUSY CLOCK DAT A TCXO MOD TX 5V 1.DATA 2.CLOCK 4.+7.5V 7.GND 8.MIC+ 10.INT_SPK_MIC_DSBL 11.SPKR+ X0 12 X1 13 Y0 2 Y1 1 Z0 5 Z1 3 INH 6 A 11 B 10 C 9 X 14 Y 15 Z 4 16 7 8 IC411 N .
PAGE - 45- May 2001 VHF RF Schematic MOD 1 2 3 4 5 6 7 8 MIXER PWR H/L G A 1 1 - I N 2 + I N 3 G N D 4 O U T 5 V C C 6 B . P 7 G A 2 8 AUDIO AMP OSO 1 LD 2 *R 3 *V 4 VPD 5 PD 6 GND 7 RX 8 FIN 10 FIN 1.
PAGE -46 - May 20 01 UHF RF Schematic 6 TX 5V 1 D20 KDS160 R43 10K MOD C57 470P MOD 2 4 3 5 7 4 PWR H/L STREENG 5 6 1 2 G A 1 - I N + I N G N D O U T V C C B .
PAGE - 47- May 2001 Block Diagram REVISIONS CHG BY DATE DESCRIPTION DESCRIPTION RELEASED TO MANUF ACTURING REV A DGC 03/01 TITLE SCALE SHEET OF SIZE DOCUMENT NUMBER B 1 1 NA SP-300 Series SYSTEM ELECTRICAL BLOCK DIAGRAM 060-***-**** LEVEL SHFTER Q6,7,8,11 TCXO1 FRONT END R V C21,C22 REF L.
PAGE -48 - May 20 01 PCB LA YOUTS Board Layout (T op) Main Board Assembly 416121B Board Layout (Bottom) Main Board Assembly 416121B Board Layout J3 VR3 CH404 FON1 TCXO1 D5 L13 C132 L11 C75 R70 L16 L17.
PAGE - 49- May 2001 m a x o n 2 11 21 24 23 7 14 13 40 41 39 36 42 54 26 25 27 VHF UHF 1 550-021-0025 UPPER COVER ASS'Y PA RT NAME PA RT NO. NO. 2 490-070-0035 NAME PLA TE 3 5 6 7 8 8-1 9 10 11 -.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Midland Radio SP-300 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Midland Radio SP-300 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Midland Radio SP-300 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Midland Radio SP-300 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Midland Radio SP-300, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Midland Radio SP-300.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Midland Radio SP-300. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Midland Radio SP-300 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
