Owner Manual s
AM/FM STEREO RADIO WITH AUTO STOP CASSETTE PLAYER
Designed Specifically for the Marine and RV Environment

MS-220

FACEPLATE CONTROLS DIAGRAM (Figure 1)
CONTROL DESCRIPTION (see figure 1)
1. 2. 3. 4. 5. 6. 7. 8. POWER BUTTON Press to turn the unit ON or OFF. EJECT BUTTON Press this button in half way to fast-forward the tape, and fully in to eject the tape. TAPE DOOR TUNING KNOB Rotate the knob to tune the desired broadcast frequency. VOLUME KNOB Rotate the knob to increase or decrease the volume level. FADER KNOB Rotate this knob to left or right for desired sound balance from front to rear speakers. DISPLAY
AM/FM BUTTON Press this button to change from AM to FM band. 9. LO/DX BUTTON Press this button to change between local (LO) and distant (DX) reception. In some cases, changing the LO/DX setting will allow clearer reception of a desired station. 10. CD IN JACK Jack is for use with an external program source, such as a portable tape or CD player. 11. TONE BUTTON Press this button to adjust for high or low tone.
WIRING DIAGRAM (Figure 2)
TO 12V DC (+) POWER TO GROUND (CHASSIS OR 12 VDC(-) TO 12 VOLT DC (+) POWER TO GROUND (CHASSIS OR 12 DCC(-)
AM ANTENNA TRIMMER ADJUSTMENT
The antenna trimmer can be accessed through the small hole behind the cassette door (see diagram below). Tune to a weak station between 1200 and 1400 KHz AM. (If you cannot find a weak station in this range, tune to any other strong station, and adjust tuning slightly off station). Adjust trimmer for maximum volume. CARE & MAINTENANCE
Cassette Always check that the tape is tightly wound inside the take-up spool on the cassette. If the tape is loose, wind it with a six-sided pencil. Never use C-120 (120 minute) cassettes in this player. Never use cassette player when vehicle temperature is near or below freezing.

SPECIFICATIONS

Size: 7(W) x 2(H) x 6-5/8(D) 178mm x 50mm x 150mm Operating Voltage: 12 VDC, Negative Ground Output Power: 50 Watts Max. Stereo Power Output Wiring: Floating Ground type designed for 4 speaker use. May also be used with 2 speakers. Output Impedance: Compatible with 4 or 8 Ohm speakers Tuning Range: (AM) 530-1710KHz (FM) 88-108MHz Sensitivity: (AM) less than 25uV (FM) less than 5uV FM Stereo Separation: More than 23dB Frequency Response: 50-10000Hz Wow & Flutter: Less than 0.3%
Cleaning of tape Head & 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 a cassette cleaning cartridge available where ever stereos are sold. De-Magnetizing The movement of the magnetic tape head and metal parts cause a magnetic field to develop. We recommend you have the tape player demagnetized at least twice annually. You can purchase an inexpensive tape head demagnetizing tool to do this yourself.

TROUBLESHOOTING CHART AM/FM RADIOS
Symptom No Power No 12VDC Cause Possible Solution Check circuit fuse at source Check in-line fuse on power lead Power lead disconnected Ground connection disconnected Circuit fuse at source In-line memory lead fuse Check for shorting of speaker leads to ground Check for proper speaker wiring. Note: Radios have a sticker on them explaining wiring color code.
Power indicated; No audio output or very distorted sound
No 12VDC to memory lead (electronically tuned units only) Speaker Output shorted
Speaker out cross channeled
Only one channel (right or left side)
Radio Balance Speaker Disconnected Speaker lead shorted or grounded Speaker wiring shorted or positive lead grounded Speaker terminals grounded or shorted
Popping in one or both channels
Check radio function Check speaker connection at radio and/or speaker Check speaker wiring continuity to ground w/tester or meter Leads from speaker cone to terminal touching metal basket or speaker

No AM Reception

Antenna disconnected Antenna mast grounded or shorted Antenna center lead broken
Connect antenna Check antenna or substitute with antenna known to be good Check antenna or substitute with antenna known to be good
Note: Antenna leads can be tested with continuity or multi-tester. Some may have electronic component (capacitor) built in which will 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/FM reception to these radios are listed below, along with some general information in regards to radio reception. AMPLIFIED AM/FM ANTENNA A popular second antenna that can be used is our AB-100 amplified AM/FM antenna. It is small and has a retractable 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 the length of the mast.
Y ADAPTERS The adapters used to connect one Y antenna to two radios will only provide AM reception to one of the radios and will compromise both AM and FM reception.
MAST LENGTH AM/FM antennas compromise AM reception by design. The optimum mast length for FM is approximately 30 inches which is 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.
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 the circumstances.

ANTENNA CABLE Increasing the antenna lead cable length (adding extensions) will reduce sensitivity of AM with electronic tuned radios.
CONCLUSION AM/FM reception is subject to the choice of an antenna and it application. There can also be s a variety of methods used to supply signal to both primary and secondary radios, but AM performance is the ultimate test. It appears that consumers or end users are becoming much more critical when it comes to acceptable antenna performance. It may be necessary for manufacturers to re-evaluate what was once considered acceptable.
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 electrical s system while it also provides the ground for the antenna lead shield. All this is necessary in order to maintain a good signal, especially AM.

Voltage

This note will discuss DC Power sources and how they relate to 12 volt DC video products. The voltage of a fully charged battery (engine not running) is approximately 12.5 VDC. Once a load (items being powered represent the 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. This size and length of the conductor (wire) supplying power. Operating these video products without the engine running will drain the battery to the point where these products will perform unacceptably in a short period of time.
DC (Direct Current) Power
A large number of our products are designed for 12 volt DC applications. The power is supplied by a variety of sources i.e., the battery, converters, ignition systems and solar power.

General Specifications

Our general specification for the voltage range of operation is 10 to 16 volts DC. TV and VCP s s (video cassette players) require slightly more than 10 volts to function properly. Normally this 10.5 to 11 voltage requirement does not create a problem, but keep in mind the following points:

Converters

Many boats incorporate converters as a source of 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 under maximum load. This AC ripple is filtered by the boat battery when connected into the circuit, but when the battery is removed or disconnected the amount of AC ripple can create major problems for audio and video products. Noise may result and the line fuse may fail.

Ignition Systems

Unwanted noise generated from the ignition systems used to be a big problem. However, with more sophisticated filtering circuits designed into 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.
Audiovox Specialized Applications, LLC 23319 Cooper Drive Elkhart, IN 46514 Phone: (219) 264-3135 FAX: (219) 264-3007 OEM web site: www.asaelectronics.com

ACCESSORY LIST

Description AVT-988 9Color Television with Remote (12V) AVT-597 5Color Television with Remote (12V) AVT-1498 13Color Television with Remote (12V) AVP-7000 Video Cassette Player (12V) BPA-501-Amp Adapter for use with AVT-988 9and AVT-Televisions AC2A- 2 Amp Adapter for use with AVT-597 5TV and AVP-7000 Video Cassette Player Unified Remote Control VAC-21- 12 Volt Corded Vacuum AVF-Volt Rechargeable Flashlight HP-175 Headphones with Pivoting Ear Cup HP-275 Headphones with Volume Control on Cord HP-375 Studio Quality Headphones
Part Number AVT988 AVT597 AVT1498 AVPVAC21 AVF1 HP175 HP275 HP375
Price $320.00 $320.00 $350.00 $270.00 $45.00 $35.00 $45.00 $35.00 $25.00 $11.75 $16.00 $14.00
Unlike household electronics, all of our products have been specifically designed and tested for the mobile environment and are only available through ASA. To order any of these products, please contact Audiovox Specialized Applications at www.asaelectronics.com or 800-688-3135.
*Prices subject to change 12