Audiovox MS250 - Manual (Page 4)

AM ANTENNA TRIMMER 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 a weak station in this range, tune to
any other strong station, and adjust tuning slightly off station).Adjust trimmer
for maximum volume.
FRONT VIEW OF RADIO
ANTENNA TRIMMER (NOTE:
OPEN CASSETTE DOOR TO SEE
THE ADJUSTMENT SCREW)
SPECIFICATIONS
Size: 7''(W) x 2''(H) x 6-5/8''(D) 178mm x 50mm 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 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 23 dB
Frequency Response: 50-10000Hz
Wow & Flutter: Less than 0.3%
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.
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.
3
This note will discuss DC Power sources 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. 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. 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 ripple noise 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 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.
APPLICATION NOTES
6
"We have a complete line of audio and video products specifically designed for
the Marine and RV market. Please contact ASA at www.asaelectronics.com for
a view of our on-line catalog."