Unisound UPA-550FM User manual
PACASSETTE PLAYER+TUNER
OPERATION MANUAL
OPERATION MANUAL
Please read this manual thoroughly before making connections and turning on the power. Following the instructions in this
manual will enable you to obtain optimum performance from your new PA Cassette Player + Tuner.
Please retain this manual for future reference.
FEATURES
Heavy duty, rugged front loading Tape Deck Mechanism withAuto-stop, Pause, FF and REW functions.
AC mains and 12V DC car battery operation.
Provision for automatic changeover from AC to Battery Operation ensuring continuity of program.
100V line for long distance speaker connections .
Separate active BASS and TREBLE controls for shaping tonal quality of music & speech as desired.
Built-in FM Radio (Range 88MHz - 108MHz) with varactor tuning, high sensitivity and excellent thermal
stability.
ThreelowimpedanceMicrophoneinputsandoneAux.Input.TheAuxinputisforconnectingMixer, CDPlayer,etc.
LINE/BOOSTER OUT for connecting additional booster amplifier.
FM - RADIO TUNER
Tuner Freq. Range : 88MHz - 108MHz
GENERAL
Power Supply : AC - 220-240V 50/60 Hz*
: DC - 12-14 V Car Battery
Semiconductors : 18 Transistors
: 9 Diodes
: 2 Zener Diodes
: 2 LEDs
Dimensions : W340 × H145 × D270 mm
Weight : 7.3 kg approx.
PLAYER SECTION
Track System : 2 Track Monaural
Tape Speed : 4.75 cm / sec.
FF/REW Time : 100 sec. Approx. (C-60)
Wow & Flutter : 0.35% Nominal
Tape SpeedAccuracy : Within +3% -2%
AMPLIFIER SECTION
Power Output : 75 Watts RMS (Max)
: 50 Watts RMS at 10% THD
: 45 Watts RMS at 5% THD (Rated)
Input Channels : 3 × Mic 0.6mV (Lo-Z) / 4.7k
: 1 × Aux 100mV / 470k
Frequency Response : 50Hz - 15,000Hz ±3dB
S/N Ratio : >55dB
Tone Control: : Bass: ±10dB at 100Hz
: Treble: ±10dB at 10kHz
Output Taps for speaker : 4, 8, 16 & 100V
matching
Line Output : 400mV / 2.7k
* This unit is connected to 240V tap when leaving the factory.
Owing to continuous product up gradation, design & specifications are
subject to change without notice.
Specifications claimed are subject to permissible production tolerances.
SPECIFICATIONS
UPA-550FM
0
2
4 6
10
8
0
2
4 6
10
8
-10
6
2 2
+10
6
8
4
0
4
8
-10
6
2 2
+10
6
8
4
0
4
8
BASS TREBLE
POWER
MIC-3/TAPE
0
2
4 6
10
8
MIC-2/FM
88 MHz 108 MHz
TUNING
MIC-1/AUX
TAPE
MIC-3
FM
MON ON
MIC-2
UPA-550FM
PA CASSETTE PLAYER + TUNER
REW FF PLAY STOP/EJECT PAUSE
AC / 12V DC
MIC-1
MIC-2
MIC-3
45W RMS / 75W Max.
19
20 21 22 23 24 25 26 27
FUSE
• Front & Rear Panel Controls & Features
• Speaker Connections
1. Jacks MIC-1 to MIC-3 15.POWER LED
For connecting low impedance microphones. This LED glows to indicate that the set is ON.
2. CASSETTE COMPARTMENT. 16.MONITOR LED
Door of this compartment can be opened for loading or 17.TREBLE Control
unloading of cassette tape by pressing STOP / EJECT For controlling the high frequency signals.
key. 18.BASS Control
3. REWIND key For controlling the low frequency signals.
Press for fast rewinding of the tape. 19.AC Mains Fuse (Rating 1Amp 250V)
4. FAST FORWARD key 20.AC Mains Cable with plug
Press for fast winding of the tape. 21.BATTERY Terminal Strip
5. PLAY key For connecting a 12V car battery.
Press for tape playback 22.EARTH Terminal
6. STOP / EJECT key 23.100 VOLT LINE Terminal Strip
For stopping the tape when it is running in any mode.
The same key pressed again ejects the cassette. 24.SPEAKER Terminal Strip
For connecting speakers or driver units.
7. PAUSE key
Press to temporarily stop the tape in PLAY mode. 25.LINE / BOOSTER Output Jack Socket
For connecting additional higher wattage amplifier for
8. MIC-3 / TAPE Selector Switch obtaining more power output.
9. MIC-3 / TAPE Volume Control 26.AUX Input Jack Socket
10.MIC-2 / FM Selector Switch For connecting an auxiliary source like a CD player,
11. MIC-2 / FM Volume Control Tuner, Echo or Audio Mixer etc.
12.FM Tuning Control 27.FM ANTENNA Screw Strip
13.MIC-1 / AUX Volume Control For connecting diapole antenna for clear reception.
14.POWER switch
LowImpedance
Speakerimpedancetaps of 4,8and 16 havebeen providedfordirect connection ofspeakersto theamplifierwhen the distance
between the amplifier and speakers is less than 50 meters. Use 23/36 or thicker cable for connections. Be sure that total
impedanceofspeakersisequaltoorabovetheimpedancespecifiedontheterminalstrip.
32 × 32
32 + 32
Total Impedance: = 16
Total Impedance: 16 × 16
16 + 16 = 8
4 8 16
COM
16
L1
L2
16
L1
L2
16
L1
L2
16
L1
L2
4 8 16
COM
16
L1
L2
16
L1
L2
0
2
4 6
10
8
0
2
4 6
10
8
43
2
1910
813
14
-10
6
2 2
+10
6
8
4
0
4
8
-10
6
2 2
+10
6
8
4
0
4
8
BASS TREBLE
POWER
MIC-3/TAPE
0
2
4 6
10
8
MIC-2/FM
88 MHz 108 MHz
TUNING
MIC-1/AUX
TAPE
MIC-3
FM
MON ON
MIC-2
UPA-550FM
PA CASSETTE PLAYER + TUNER
REW FF PLAY STOP/EJECT PAUSE
AC / 12V DC
MIC-1
MIC-2
MIC-3
56711 12
16
17
18 15
• Operating Procedure
CASSETTE INSERTION
ACMAINS OPERATION
Set all volume controls to '0' position and keep the power
switch at OFF position. Connect the speakers and required
inputs.
Plug in the AC power supply cord to the nearest AC mains
socketandputthepowerswitchtoPOWERposition.Thepilot
LEDshouldglow.
Adjustthe volumeand tone controls to thedesired levelin the
followingmanner:
1. TheBASS andTREBLEcontrols should besetat‘0’(Flat)
position.
2. Move the volume control of MIC-1 channel slowly to the
desired sound level but not up to the point where howling
andfeedbackstarts.
3. NowrepeatthesameforMIC-2,MIC-3andsoon.
4. When playing a tape, keep the MIC-3 / TAPE switch at
TAPEposition.
5. ThetapecanbeadvancedrapidlybypressingtheFFkey.
6. The tape can be rewound rapidly by pressing the REW
key.
7. Tostopthetape,presstheSTOP/EJECTkey.Toejectthe
tape,pressthiskeyasecondtime.
8. Due to the Auto Stop system, the cassette stops
automatically when the tape comes to an end in play
mode.
100VLine
When it is desired to connect speakers or driver units at a
distanceover50meters,itisrecommendedthatthe100Vline
output be used together with line matching transformer for
each speaker. This prevents excessive power loss in the
speakercables.
100VLine output is provided on a separate terminal strip with
its COM separate from low impedance speaker connections.
This provides facility for floating or grounding of long line
installations. For floating, disconnect the shorting link
betweenearthterminalandCOMof100VLineoutputstrip.
Since this is a front loading cassette player, the cassette is to
be loaded with the exposed tape portion facing down and the
fullreeloftapetowardstheleft.
100V
COM
30W
20W
10W
5W
40W
COM
1
L1
L2
30W
20W
10W
5W
40W
COM
2
L1
L2
30W
20W
10W
5W
40W
COM
9
L1
L2
USINGTHETONECONTROLS
TheBass andTreble controlsshould beindividually set tothe
desiredlevelasexplainedbelow.
BASS: This controls the tonal quality of low frequencies
producedbymusicalinstrumentslikeTabla/Drumetc.,andto
some extent male human voice. When this control is
advanced towards BOOST position, it will boost i.e. increase
the intensity of the low frequencies. Similarly, when it is
lowered towards CUT position, it will cut i.e. reduce the
intensityoflowfrequencies.
TREBLE: This controls the tonal quality of high frequencies
produced by musical instruments like Violin, Sarangi and
Sitar etc. and to some extent female human voice. When the
control is advanced towards BOOST position, it will boost i.e.
increase the intensity of high frequencies. Similarly, when
lowered, towards CUT position, it will cut i.e. reduce the
intensityofhighfrequencies.
FMRADIOOPERATION
PuttheFM/MIC-2SwitchinFMposition.
TunetothedesiredFMstationbyrotatingtheTuningKnob.
FM Antenna Screw Strip has been provided for optimizing the
receptionofthetunerbyconnectinganexternalantenna.
Incase ofstronglocalstations, or whentheequipmentis situated
near a transmitting station, the external antenna may not be
required. In case of fringe areas where the signal is very weak, a
diapoleantenna may beconnected to theantenna terminals with
thehelpof2-wayribbonwire.
PRECAUTION
1. Do not use this unit in high ambient temperature.
2. Before the cassette tape is inserted into the cassette slot,
loose tape must be tightened up to avoid its entangling with
thepinchroller.
3. Speaker impedance mismatch may cause insufficient output
oroverheatingofthecomponents,whichmayleadtofailureof
thecomponents. Check andmakesurethatthe impedance of
the speakers is equal to or greater than the selected
impedanceontheoutputterminalstrip.
4. Use of C-120 cassette is not recommended as it is extremely
thinandmaycauseproblems.
TROUBLECHECKS
The following trouble checks will help to correct the most
commonproblemsencounteredwithacassetteplayer.
The auto stop mechanism activates and the tape stops
justafteritisinserted.
+Thetapeiscompletelywoundontherightreel.
+Cassettespoolsjammedduetodeformedcassetteshell.
Tape moving but no output
+Thetapevolumecontrolisatminimum.
+Speakersarenotconnected.
+TheMIC-3/TAPEselectorswitchisatMIC-3position.
HuminMicandAux.inputs
+Shielding of the pickup wire not proper. Use good quality
shieldedcableforinputconnections.
Set gets very hot during operation
+Proper ventilation not provided. Keep the set away from
wallsinawellventilatedarea.
+Speaker mismatch causing overloading. Check the total
speakerimpedance and connectit to the proper tapon the
outputterminalstrip.
Lossofpowerat thespeakers
+Speaker cables very long. Under such conditions, make
useofthe100Vlineoutputconnection.
+Speakercablesthin.Usethickertype23/36cables.
+Speakermaybedefective.
MAINTENANCE
To get long trouble free service, maintenance is essential.
After some use the Head, Capstan, Pinch Roller etc. that
come in contact with the tape, become dirty due to dust or
magnetic material on the tape. Dirty heads cause loss of high
frequenciesandtheoutputfalls.Dirtycapstanandpinchroller
will cause unstable tape speed, leading to increased Wow
andFlutter.
• Maintenance & Trouble Checks
To clean these, follow the under-mentioned procedure:
+Open the cassette door by pressing the STOP / EJECT
key.
+Press the PLAY key. The head becomes visible inside the
cassettecompartment.
+Cleanthehead andpinchroller with a cotton bud dipped in
methylatedspirit/alcohol.
+Keep magnets and metallic objects away from the head. If
the head gets magnetized, it will lead to more noise and
loss of high frequencies. The head and all metallic parts
shouldbegotdemagnetizedafterabout50hoursofuse.
+Consultyourdealeraboutdemagnetizingthehead.
TRUSOUND PVT. LTD. C-89, Sector IV, Noida, Gautam Budh Nagar-201 301 (UP)
Regd. Office : 125E, Okhla Industrial Estate, New Delhi-110 020
Tel.: +91-120-2551452/53 Fax : +91-120-2553677
1K/07/07/R0
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