Inter-m PA-920 Manual de usuario
OPERATING MANUAL
POWER
AMPLIFIER
PA-920/935
11
UNPACKING AND INSTALLATION
Although it is neither complicated to install nor difficult to operate your amplifier, a few minutes of your time is
required to read this manual for properly wired installation and becoming familiar with its many features and how
to use them. Please take a great care in unpacking your set and do not discard the carton and other packing
materials. They may be needed when moving your set and are required if it ever becomes necessary to return
your set for services. Never place the unit near radiator, in front of heating vents, to direct sun light, inexcessive
humid or dusty location to avoid early damage and for your years of quality use. Connect your complementary
components as illustrated in the following page.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK.
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING
To prevent fire or shock hazard, do not
expose the unit to rain or moisture.
This symbol is intended to alert the user to the
presence of uninsulated “dangerous voltage” within
the product’s enclosure that may be of sufficient
magnitude to constitute a risk of electric shock to
persons.
This symbol is intended to alert the user to the
presence of important operation and maintenance
(servicing) instructions in the literature accompanying
the appliance.
Caution: To prevent electric shock do not use this (polarized) plug with
an extension cord, receptacle or other outlet unless the blades
can be fully inserted to prevent blade exposure.
Attentions: Pour prévenir les chocs électriques ne pas utiliser cette fiche
polarisée avec un prolongateur, une prise de courant on une
autre sortie de courant, sauf si les lames peuvent étre
insérées à fond sans en laisser aucune partie à découvert.
22
FEATURES
•VERSATILE AND CONVENIENT
3 channels of input signals from MIC1, MIC2/AUX1 and MIC3/AUX2 are provided, and Bass and Treble are
incorporated for versatile and convenient use. MIC, AUX input have PL55 phone jack and Telephone IN input
have screw terminal.
33
FRONT PANEL CONTROLS
1. POWER SWITCH
Pressing this switch to ON will make the power indication LED ON and supply the power to this unit.
2. POWER LED
Pressing power switch to ON will make the power indication LED ON.
3. TREBLE
This control is used for modifying the high frequency sound.
4. BASS
This control is used for modifying the low frequency sound.
5. MIC VOLUME
You can adjust the volume level of Mic 1, Mic 2, and Mic 3.
6. AUX VOLUME
You can adjust the volume level of Aux 1 and Aux 2.
7. MASTER VOLUME
This control is used for adjusting the volume of finally mixed sound.
AMPLIFIER
PA-935
MIC 1 MIC 2/AUX 1 MIC 3/AUX2 BASS TREBLE
-10 +10 -10 +10
POWER ON
OFF
POWER
5
4
3
2
1
010
9
8
7
60 0
10
8
6
4
2
020
18
16
14
12
MASTER VOLUME
ON
5
4
3
2
1
010
9
8
7
65
4
3
2
1
010
9
8
7
6
1
2345
6 7
44
REAR PANEL CONTROLS
89
10
1. AC CORD
Plug this AC input cord into AC outlet.
2. FUSE HOLDER (AC)
This fuse holder contain AC fuse, replace only with same type fuse when it is blown out. If it continuously
blow, stop replacing fuse and refer servicing to qualified personnel.
3. SPEAKER OUTPUT TERMINAL
This terminal is for speaker wire connection. You can select one of 4 ohms, 8 ohms, 70 volts and 100 volts.
Be sure not to make the total impedance less than rated impedance.
4. GND TERMINAL
This is ground terminal to be connected with chassis of the turntable etc, to reduce hum to minimum. To
further minimize hum, it may be necessary to connect this terminal with a wire to the nearest water pipe
which goes directly to real ground.
5. MIC 1, 2, 3 INPUT (PHONE JACK)
These phone jacks are for the Mic 1 and Mic 2 input. Input sensitivity and impedance in PHONE JACK
2mV/600Ω.
FUSE
T1AL/250V
COM 4
B
70V 100V
AUX 1 AUX 2 GND
T / P
INPUT
GND
MIC3 MIC2 MIC1
AUX 2 MIC 3
TEL/MUTE MIC1/MUTE
~AC INPUT
230V 50Hz,72W
MODEL:PA-935 AMPLIFIER
OUTPUT
BALANCED
S/N
AUX 1 MIC 2
INPUT
BALANCED
STEREO MIXED
12 3 4 5
67
Voltage AC 220V/240V
PA-920 Fuse Rating 0.5A/250V
PA-935 Fuse Rating 1A/250V
55
6. MUTE CONTROL
When the other signal is muted by Mic 1 and Telephone paging, this control is used for adjusting the muting
level.
7. MIC 2/AUX 1 SELECTOR SWITCH
This switch is used to select MIC 2 or AUX 1.
8. MIC 3/AUX 2 SELECTOR SWITCH
This switch is used to select MIC 3 or AUX 2.
9. TELEPHONE IN TERMINAL
These terminals are to be connected to telephone exchange system for paging.
NOTE: When there are paging signal through this terminals, the other input signals are muted.
10. AUX INPUT (PHONE JACK)
You can connect the sound source of tuner, deck, CD, video, etc to this input.
66
INSTALLATION OF THE SPEAKERS
When you connect the speaker, remove the power cord from AC outlet. And use the suitable terminals
connecting way as belows. Be sure that total impedance is not less than rated impedance.
• AC VOLTAGE: 220V–240V ONLY
VOLTAGE PA-920 8.9V 12.65V 70V 100V
PA-935 11.8V 16.73V 70V 100V
IMPEDANCE PA-920 4 OHMS 8 OHMS 245 OHMS 500 OHMS
PA-935 4 OHMS 8 OHMS 140 OHMS 285 OHMS
FOR 4ΩTERMINAL
12V 16.7V 140Ω285Ω(PA-935)
9V 12.8V 245Ω500Ω(PA-920)
FOR 70V TERMINAL
12V 16.7V 140Ω285Ω(PA-935)
9V 12.8V 245Ω500Ω(PA-920)
FOR 100V TERMINAL
12V 16.7V 140Ω285Ω(PA-935)
9V 12.8V 245Ω500Ω(PA-920)
FOR 8ΩTERMINAL
12V 16.7V 140Ω285Ω(PA-935)
9V 12.8V 245Ω500Ω(PA-920)
(Figure 2-1)
(Figure 2-4)(Figure 2-3)
Be sure that total impedance is not less than
rated impedance. Be sure that total impedance is not less than
rated impedance.
(Figure 2-2)
77
CONNECTIONS
FUSE
T1AL/250V
COM 4
B
70V 100V
AUX 1 AUX 2 GND
T / P
INPUT
GND
MIC3 MIC2 MIC1
AUX 2 MIC 3
TEL/MUTE MIC1/MUTE
~AC INPUT
230V 50Hz,72W
MODEL:PA-935 AMPLIFIER
OUTPUT
BALANCED
S/N
AUX 1 MIC 2
INPUT
BALANCED
STEREO MIXED
EARTH
SPEAKERS
TUNER
CASSETTE DECK
TELEPHONE
EXCHANGE SYSTEM
SCHEMATIC DIAGRAM (PA-920)
88
99
SCHEMATIC DIAGRAM (PA-935)
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