ASA Electronics MS250 User's Manual
Contents
1. AM FM reception is subject to the choice of an antenna and it s application There can also be a variety of methods used to supply signal to both primary and secondary radios but AM performance is the ultimate test2. VDC I VIOLET W BLACK GREEN W BLACK J f Front Left Front Right Speaker Speaker GREEN VIOLET P eo VIOLET W BLACK O Rear Left Speaker GREEN W BLACK V Rear Right Speaker The Mobile Electronics Company Aubiovox SPECIALIZED APPLICATIONS L L C 90 DAY 12 MONTH LIMITED WARRANTY AUDIOVOX SPECIALIZED APPLICATION LLC the company warrants to the original retail purchaser of this product that should this product or any part thereof under normal use and con ditions be proven defective in material or workm anship within 90 days from the date of original purchase such defect s will be repaired or replaced at the company s option without charge for parts and repair labor After the initial 90 day period and for a period of 12 months from the date of original purchase the Company will supply at no charge a replacement for any defective part s but will charge for the labor to repair the product To obtain repair or replacement within the terms of this warranty the product is to be delivered with proof of warranty coverage e g dated bill of sale specification of defect s transportation prepaid to an approved warranty station or the Company at the address shown below This warranty does not extend to the elimination of externally generated static or noise to the correcti
3. AEA Aupiovox SPECIALIZED APPLICATIONS LLC www asaelectronics com AM FM STEREO RADIO WITH AUTO STOP CASSETTE PLAYER Designed Specifically for the Marine and RV Environment FACEPLATE CONTROLS DIAGRAM Figure 1 Z STEREO _I MHz 1 POWER BUTTON Press it toturn the unitON or OFF 5 2 EJECT BUTTON Press this button in half way to fast forward the tape and fully in to eject the tape 3 TAPE DOOR 4 TUNING KNOB Rotate the knobto tune the desired broadcast frequency 5 VOLUME KNOB Rotate the knob to increase or decrease the volume level 6 FADERKNOB Rotate this knob to left or right for desired sound balance from front to rear speakers 7 DISPLAY 8 TONE BUTTON Press this button to adjust for high orlow tone 9 LO DX BUTTON Press this buttonto change between local LO and distant DX reception in some cases changing the LO DX setting willallow clearer reception ofa desired station 10 AM FM BUTTON Press this button to change AMor FM band WIRING DIAGRAM Figure 2 MS250 g Antenna WHITE M RED GRAY BLUE BLACK 9 PINCONNECTORS AUT ANT TO 12V DC POWER TO GROUND CHASSIS OR 12
4. ad fuse Check continuity of speaker leads to ground Speaker out cross channeled Radio Balance Check for proper speaker wiring Note Radios have asticker on them explaining wiring color code Check radio function Speaker Disconnected Check speaker connection at radio and or speaker Speaker lead shorted or grounded Speaker wiring shorted or positive lead grounded Speaker terminals grounded or shorted Antenna disconnected Check speaker wiring continuity to ground w tester or meter Leads from speakercone to terminal touching metal basket or speaker Connect Antenna Antenna mast grounded or shorted Check antenna orsubstitute with antenna known to be good Antenna center lead broken Check antenna orsubstitute with antenna known to be good NOTE Antenna leads can be tested with continuity or multi tester Some may have electronic component capacitor builtin which not allow it to be tested APPLICATION NOTES AM FM RECEPTION Some boats have more than one AM FM radio The best way to insure good reception is to supply a separate antenna for each radio Other options available to supply adequate AM FMreception to these radios are listed below along with some general information in regards to radio reception Y ADAPTORS The Y adaptors used toconnect one antenna to two radios will compromise both AM and FM reception AMPLIFIED AM FMANTENNA A popular second ant
5. anty gives you specific legal rights and you may also have other rights which vary from state to state AUDIOVOX SPECIALIZED APPLICATIONS LLC 23319 COOPER DR ELKHART IN 46514 Visit us at http www asaelectronics com APPLICATION NOTES This note will discuss DC Powersources and how they relate to 12 volt products General Specifications Our general specification for the voltage range of operation is 10 to 16 volts DC Voltage The voltage of a fully charged battery engine not running is approximately 12 5 VDC Oncea load items being powered representthe load is applied the voltage will drop How much the voltage is reduced will depend on the following 1 Current draw amount of amperage The higher the draw the greater the voltage will drop 2 The size and length of the conductor wire supplying power Converters Many boats incorporate convertors as a source for 12VDC when connected to shore power 110 120 VAC Some converters put out a very clean DC supply where others may have a considerable amount of AC ripple noise under maximum load This AC ripplenoise is filtered by the boat battery when connected into the circuit but when the battery is disconnected the amount of AC ripple noise can create major problems for audio products Noise may result and the line fuse may fail Ignition systems Unwanted noise generated from ignition systems used to be a big problem However with more sophisticated filtering circ
6. enna that can be used is our AB 100 amplified AM FM antenna It is small and has aretractable mast that can be mounted vertically or horizontally This antenna provides good FM reception but the AM reception will be compromised to some degree because of thelength of the mast MAST LENGTH AM FM antennas compromise AM reception by design The optimum mast length for FM is approximately 30 inches which is the standard for most automotive antennas The optimum mast length for AM reception is over 100 inches which is not practical for mobile applications Special circuitry in electronic tuned radios or AM trimmers in mechanically tuned radios make up for some of this difference in optimum mast length for AM reception ANTENNA CABLE Increasing the antenna lead cable adding extensions will reduce sensitivity of AM with electronic tuned radios GROUND PLANES Ground planes are also important when considering antenna performance Most automotive antennas are designed to be mounted on the metal body of the vehicle The metal body reflects the signal interference generated by the vehicle s electrical system while italso provides the ground for the antenna lead shield All this is necessary in order to maintain a good signal especially AM FM RECEPTION FM reception can be received with a very limited antenna and strong local FM stations can be received without an antenna depending on thecircumstances CONCLUSION
7. equency Response 50 10000Hz Wow amp Flutter Less than 0 3 CARE amp MAINTENANCE Cassette Always check thatthe tape is tightly wound inside the take up spool on the cassette If the tapeis loose wind it witha six sided pencil Never use C 120 120 minute cassettes inthis player Never use cassette player when vehicle temperature is near or below freezing Cleaning of Tape Head amp Capstan Since tapes contain oxides you will find a black residue builds up on the tape head and drive capstan inside cassette door These residues should be cleaned after 50 100 hours of accumulated tape operation You can use acassette cleaning cartridge available where ever stereos are sold De Magnetizing The movement of the magnetic tape head and metal parts causea magnetic fieldto develop We recommend you have the tape player demagnetized atleast twice annually Youcan purchase an inexpensive tape head demagnetizing toolto do this yourself TROUBLESHOOTING CHART AM FM RADIOS Symptom No Power Power indicated no audio output or very distorted sound Only one channel right or left side Popping inone or both channels No AM Reception Cause No 12VDC No 12VDC tomemory lead electronically tuned units only Speaker Output shorted Possible Solution Check circuit fuse at source Check in line fuse on power lead Power lead disconnected Ground connection disconnected Circuit fuse atsource In line memory le
8. on of antenna problems to costs incurred for removal or reinstallation of the product or to damage to any tapes speakers accessories This warranty does not apply to any product or part thereof which in the opinion of the company has been damaged through alteration improper installation mishandling misuse neglect or accident THE EXTENT OF THE COMPANY S LIABILITY UNDER THIS WARRANTY IS LIMITED TO THE REPAIR OR REPLACEMENT PROVIDED ABOVE AND IN NO EVENT SHALL THE COMPANY S LIABILITY EXCEED THE PURCHASE PRICE PAID BY THE PURCHASER FOR THE PRODUCT This warranty is in lieu of all other express warranties or liabilities ANY IMPLIED WARRANTIES INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY SHALL BE LIMITED TO THE DURATION OF THIS WARRANTY ANY ACTION FOR BREECH OF ANY WARRANTY HEREUNDER INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY MUST BE BROUGHT WITHIN A PERIOD OF 30 DAYS FROM THE DATE OF ORIGINAL PURCHASE IN NO CASE SHALL THE COMPANY BE LIABLE FOR ANY CONSEQUENTIAL OR INCIDENTAL DAMAGES FOR BREECH OF THIS OR ANY OTHER WARRANTY EXPRESS OR IMPLIED WHATSOEVER No person or representative is authorized to assume for the company any liability other that expressed herein in connection with the sale of this product Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages so the above limitations or exclusions may not apply to you This warr
9. uits designedinto audio video products these problems are not as wide spread Changes in wire harnessing also has contributed to the decline of application problems Use the same ground point for all related products This will greatly reduce the potential for unwanted noise We havea complete line of audio and video products specifically designed for the Marine andRV market Please contact ASA at www asaelectronics com for a view ofour on line catalog AM ANTENNATRIMMER ADJUSTMENT The antenna trimmer can be accessed through the small hole behind the cassette door see diagram below Tune radio to a weak station between 1200 and 1400 KHz AM If you cannot find aweakstation in this range tune to any otherstrong station and adjust tuning slightly off station Adjust trimmer for maximum volume FRONT VIEW OF RADIO a B E Aguironict AT j ANTENNA TRIMMER NOTE OPEN CASSETTE DOOR TOSEE gi r THE ADJUSTMENT SCREW SPECIFICATIONS Size 7 W x 2 H x6 5 8 D 178mm x50mm x 150mm Operating Voltage 12VDC Negative Ground Output Power 50Watts Max Stereo Power Output Wiring Floating Ground type designed for 4 speakers use May also be used with 2 speakers Output Impedance Compatible with 4 or8 ohm speakers Tuning Range AM 530 1710KHz FM 88 108MHz Sensitivity AM less than 25uV FM less than 5uV FM Stereo Separation More than 23 dB Fr
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