MAR1 Power Amplifier Service Manual 23
SAFETY FIRST! WARNING - TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. WATER AND ELECTRICITY DO NOT MIX. Keep this unit away from water. If water or other liquids are spilled on or into this unit, unplug the power cord immediately from the wall socket (with DRY HANDS) and get a qualified service technician to check it out before using. Keep this unit away from heaters, radiators and other heat producing devices. DO NOT ATTEMPT TO SERVICE THIS UNIT.
Introduction Congratulations on your purchase of the Phonic MAR 1 Reference Amplifier. Like other Phonic MAR series power amplifiers – MAR 2/4/6, this unit is designed to provide a good combination of power, audio clarity, reliability and durability.
MAR 1 Power Amplifier 4 3 2 1 5 Front Panel Description l Thermal protection on the heatsink: If the amp overheats, thermal shutdown protects the circuitry until the temperature is reduced to a safe level. l Short circuit protection: The Protect LED Indicator will also light up if the speaker terminals are short circuited, or the impedance of the load is too low. In these circumstances, the Protect LED will stay on until the fault condition is rectified. 1.
solve the problem, check your output cables and speakers. 5. Power Switch 4. Signal “Status” LED Indicator The power ON/Off switch with an LED indicator. Always start with Gain Control (1) all the way down before powering-up to avoid abnormal sound from defective cables or hookups. Each channel of the MAR 1 features a signal LED to show that there is an audio signal at the input to the channel. The threshold for the indicator is –26 dB, which should be enough to avoid noise triggering the LED.
to keep the switch in the “Ground On” position, Amplifier is off; otherwise the speakers’ components could be damaged. 9. Binding Post Output Ch1/ Ch2 8. Ground Lift Switch This switch allows the circuit and chassis grounds to be separated in case on a ground conflict. In normal use the switch should be in the Ground On position. Lifting the ground (Floating position) may resolve the ground conflict, but which means that circuit grounding depends on other connected components.
Hook-up #1 Studio Monitor Amp/ Sound Reinforcement The MAR1 is ideal for driving near-field or other reference speakers. For auditorium and live music use, the MAR 1 has sufficient power to drive a set of small-to-medium size club speakers.
Hook-up #2 Bi-Amp Sound Reinforcement Biamplification often provides better live sound and greater efficiency by splitting the audio signal into two different channels. One MAR1 drives a low frequency speaker system and the other, a high frequency speaker system.
Specifications Frequency response (1W/ 8 ohms) 20 – 20kHz (+ 1 dB) Power bandwidth (100W/ 8 ohms) 20 – 20kHz (+ 1 dB) Total harmonic distortion < 0.3 % (100W/8 ohms, 10Hz – 20kHz) <0.5 % (120W/4 ohms, 10Hz – 20kHz) Signal to noise ratio (IHF-A) > 100 dB Slew rate 25 V/us Damping factor > 150 (Rate output: 100W/8ohms @1kHz) Crosstalk (Rate output: 100W/8ohms @1kHz) >75 dB Rated Power 100W (8 ohms, both channel driven) Max. Output Power 4 ohms, 1kHz, 1% T.H.D.
PC-Board Layout MAR1 Input / Output & Power Supply Board 9
PC-Board Layout MAR1 Power Amplifier Board 10
MAR1 BLOCK DIAGRAM 11
Schematic Diagram 1 MAR1 Power Amplifier Input / Output (MAR1 Input / Output & Power Supply Board) 12
Schematic Diagram 2 MAR1 Power Amplifier Power Supply (MAR1 Input / Output & Power Supply Board) 13
Schematic Diagram 3 MAR1 Power Amplifier ch1/2 Power AMP (MAR1 Power Amplifier Board) 14
Parts List Schematic Diagram 1 MAR1 Power Amplifier Input / Output (MAR1 Input / Output & Power Supply Board) Ref. PHONIC Part # Description BD1, BD2 090-10000-000-0 SEMI, DIODE, BRIDGE, PB154 BD1, BD2 *2 322-05000-100-0 TUBE, 5mm*D1 C1, C2, C14, C15 042-22024-020-0 CAP, CERAMIC, TYPE2, 50V, 22pF, 5% C17, C20 030-47556-0A0-0 CAP, ELEC, 85C, 50V, 4.
R32, R53 000-12326-400-0 RES, CF, 1/4W, 10K, 5% R35 000-33306-400-0 RES, CF, 1/16W, 33K, 5% R36, R40 000-47306-400-0 RES, CF, 1/16W, 47K, 5% R54 000-18306-400-0 RES, CF, 1/16W, 18K, 5% R56, R59 000-18226-400-0 RES, CF, 1/4W, 1.8K, 5% R58 000-10106-400-0 RES, CF, 1/16W, 100, 5% R6, R7 000-82326-400-0 RES, CF, 1/4W, 82K, 5% R63 000-15426-400-0 RES, CF, 1/4W, 150K, 5% R65 000-33326-400-0 RES, CF, 1/4W, 33K, 5% R66 003-33003-601-0 RES, CEMENT, 5W, 0.
Parts List Schematic Diagram 2 MAR1 Power Amplifier Input / Output (MAR1 Input / Output & Power Supply Board) Ref. PHONIC Part # BD3 090-10015-000-0 SEMI, DIODE, BRIDGE, KBL06 BD4 090-10013-000-0 SEMI, DIODE, BRIDGE, PUB605 C31 058-68325-100-0 CAP, LINE, 250V, 0.
Parts List Schematic Diagram 3 MAR1 Power Amplifier ch1/2 Power AMP (MAR1 Power Amplifier Board) PHONIC Part # Description C101 ,C126 042-47225-050-0 CAP, CERAMIC, TYPE2, 50V, 4700pF, 5% C102, C109, C122, C128 042-47144-050-0 CAP, CERAMIC, TYPE2, 100V, 470pF, 5% C103, C129 042-47124-050-0 CAP, CERAMIC, TYPE2, 50V, 470pF, 5% C104 030-22736-0A0-0 CAP, ELEC, 85C, 25V, 220μF, 20% C104 322-05000-100-0 TUBE, 5mm*D1 C104 322-05000-100-0 TUBE, 5mm*D1 C105, C125 042-10424-050-0 CAP, CERAMIC, TY
R125,R126 000-39226-400-0 RES, CF, 1/4W, 3.9K, 5% R127 006-49912-420-0 RES, MF, 1/4W, 4.99K, ±1% R131 000-82126-400-0 RES, CF, 1/4W, 820, 5% R132 020-20151-000-0 RES, SEMI-FIX, ROTARY, 200, 0.1W, D10 R133 011-33000-010-0 RES, THERMAL, PTC R142, R120 003-33093-602-0 RES, CEMENT, 5W, 0.
Parts List MECHANISM MAR1 Ref. PHONIC Part # 212-10010-580-0 212-10010-590-0 Description CONN, 1/4", WAFER, PLUG,1-PIN,60mm 212-10023-070-0 CONN, 1/4", WAFER, PLUG, 2-PIN, 230mm CONN, 1/4", WAFER, PLUG, 2-PIN, 230mm 212-10023-080-0 CONN, 1/4", WAFER, PLUG, 2-PIN, 320mm 212-10041-100-0 CONN, 1/4", WAFER, PLUG, 4-PIN, 250/350 321-00000-070-0 CABLE, TIE, HW-100mm 370-08010-733-0 POWER, CORD, 125V, 10A, 2.
B-B 631-60003-000-0 HEMECON, 10*360mm C-C B34-34010-230-1 MAR1, PHONIC, AC, 120V, UL/CAS 21
Parts List Power Requirement Classification AC240V SAA FUSE5 280-3E216-001-0 FUSE, 3.15A, 250V, SSA, BEL5ST3.15 FUSE1-4 280-63267-000-0 FUSE, TSD6.3A, 250V, VDE/UL/CSES 370-12040-839-0 POWER, CORD, 10A, 250V, 2.5m, 3P, SAA 527-11000-000-0 STRAN, RELIEF, BUSHING, 6W3-4, R 619-06380-320-0 PLA, RIVET, ST-3L Parts List Power Requirement Classification AC240V SA FUSE1-4 280-3E216-001-0 FUSE, 3.15A, 250V, SSA, BEL5ST3.15 FUSE1-4 280-63267-000-0 FUSE, TSD6.
