Operation Manual Mixing Amplifier PMU-60/120/240
MIXING AMPLIFIER Welcome A personal welcome to you from the management and employees of Inter-M All of the co-workers here at Inter-M are dedicated to providing excellent products with inherently good value, and we are delighted you have purchased one of our products. We sincerely trust this product will provide years of satisfactory service, but if anything is not to your complete satisfaction, we will endeavor to make things right.
MIXING AMPLIFIER Contents Unpacking .......................................................................................................................................2 Installation Environment....................................................................................................................................2 Important Safety Instructions.............................................................................................................2 Features...............................
MIXING AMPLIFIER Unpacking Although your PMU-60/120/240 is neither complicated nor difficult to operate, we recommend you take a few minutes to read this brief manual and familiarize yourself with the important information regarding product features, setup and operation. As with most electronic devices, we strongly recommend you retain the original packaging. In the unlikely event the product must be returned for servicing, the original packaging (or reasonable equivalent) is required.
MIXING AMPLIFIER Features - 2U Size - 60W /120W /240W output power - SMPS delivers high power output with low power consumption and weight reduction - 5 Microphone/Line Inputs, EXT IN and TELL IN with individual volume control - Input Level LED Monitor per channel - Separate BASS/TREBLE Tone Controls - 5 zone selection switches - Independent built-in Attenuator over Zone 5 - PRIORITY - Remote MUTE and CHIME terminal - VCA Remote volume controll Operation 1.
MIXING AMPLIFIER Front Panel 1. INPUT LEVEL CONTROL Controls the level of each of the six input channels. 2. INPUT SIGNAL INDICATOR These LEDs light green when input signal is present. 3. CHIME SWITCH It activates the four tone chime circuitry. The chime indicator lights green when chime is on use. 4. TONE CONTROL Controls the bass (100Hz) and treble (10KHz) tones of the main amplifier output. 5. PROTECTION MODE INDICATOR Indicated that the amplifier is in failure protection mode. 6.
MIXING AMPLIFIER 9. ATTENUATOR Built-in ATTENUATOR over zone 5, It allows to decrease the output volume independently from master volume. Mode 100V Output 70V Output Switch mode 1 100V 70V Switch mode 2 70V 49V Switch mode 3 50V 35V 10. ZONE SELECTION SWITCH Use the zone selection switches to route the program audio from the amplifier output to speaker zone 1 through zone 5. The All button controls turns ON/OFF all zones.
MIXING AMPLIFIER Rear Panel 1. AC MAINS (AC INLET) It accepts a standard IEC mains cable, provided. 2. REMOTE CHIME SWITCH TERMINAL This terminal is used to activate the 4 tone chimes remotely. 3. MANUAL MUTE TERMINAL When these two terminals are shorted, the output signal is blocked and the protection indicator on the front panel flashes. 4. VCA (VOLTAGE CONTROLLED AMPLIFIER) TERMINAL These two terminals provide connection for an external potentiometer.
MIXING AMPLIFIER 5. TEL IN TERMINAL This terminal is provided for connection with a telephone exchange system for paging purposes. ※NOTE : When the telephone input is active, all other input signal except AMP IN are muted. 6. TEL IN VOLUME CONTROL It controls the volume of the TEL IN. 7. TEL IN PRIORITY VOLUME CONTROL It controls the mute level of all other input signal when the TEL IN signal is present 8.
MIXING AMPLIFIER Speaker Connection Before connecting speakers to the unit, be sure to disconnect the AC power cable. Make certain that the total impedance is not less than the rated impedance indicated.
MIXING AMPLIFIER ※Warning : For high impedance systems, connect with matching transformer as the following Figure. Be certain that the total impedance does not equal less than the rated impedance. Low Impedance (100V) (70V) PMU-60 4Ω 167Ω 83Ω PMU-120 4Ω 83Ω 42Ω PMU-240 4Ω 42Ω 21Ω Please do not use a 4Ω and SP1~SP5 terminal at the same time.
MIXING AMPLIFIER System Connection AC INPUT 10 PMU-60/120/240
MIXING AMPLIFIER Block Diagram PMU-60/120/240 11
MIXING AMPLIFIER Specifications Rated Output Power PMU-60 PMU-120 PMU-240 60W 120W 240W Frequency Response (SP OUT/1W output) 80Hz~15kHz T.H.D (Rated Output, 1kHz) Less than 0.5% S/N (Rated Output) More than 78dB Tone Control (100Hz, 10kHz) Input Sensitivity/ Impedance Input 1~5 ±10dB MIC -50dBu/2kΩ LINE -10dBu/2kΩ Input 6 -10dBu/10kΩ TEL IN 0dBu/10kΩ EXT IN 0dBu/20kΩ MIX Out/Impedance 0dBu/10kΩ Speaker Output Level/Impedance LOW-Z 15.
MIXING AMPLIFIER ※DIMENSIONS 319 - PMU-60/120 88 420 319 - PMU-240 88 420 PMU-60/120/240 13
MIXING AMPLIFIER Service Procedures Take steps to insure the problem is not related to operator error or other products within the system. Information provided in the troubleshooting portion of this manual may help with this process. Once it is certain that the problem is related to the product contact your warranty provider as described in the warranty section of this manual. Schematic A Schematic is available by contacting your warranty provider.
NOTE PMU-60/120/240 3
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MIXING AMPLIFIER NOTE PMU-60/120/240 3
Inter-M, Ltd. (Korea) began operations in 1983. Since then, Inter-M has grown to become one of the largest manufacturers of professional audio and commercial sound electronics equipment in the world. Inter-M has gained worldwide recognition for its own branded products, as well as private label manufacturing of electronics sold under other names (OEM).
