Instruction/ maintenance manual of the product 9303 Hafler
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® MADE USA IN THE PROFESSIONAL POWER AMPLIFIER 9303 / 9505 Installation & Operation PROFESSIONAL POWER AMPL nova trans ®.
NOTICE - IMPORTANT SAFETY INFORMATION CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ! ! W ARNING: T O PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. 1. READ INSTRUCTIONS All the safety and operating instructions of your Hafler equipment should be read before power is applied to the equipment.
P ERFORMANCE S PECIFICATIONS 9303/9505 Full Power Bandwidth: 0.15Hz to 300kHz Signal-to-Noise: >100dB “A” Weighted Slew Rate: 150 V/ µ s CMRR: 75dB at 1kHz Gain: +29dB max. 9303 Power Rating: 150 wpc @8 Ω , 225 wpc @ 4 Ω , 450 Watts mono @ 8 Ω Distortion: 0.
T ABLE OF C ONTENTS SAFETY PRECAUTIONS ........................................................................................................................................... i PERFORMANCE SPECIFICATIONS ...........................................
I NTRODUCTION – 1 – The Hafler 9303 and 9505 are two channel professional power amplifiers. Passive cooling with large heatsinks is used for low mechanical noise. Our patented trans• nova circuit topology and MOSFET output stage ensures trouble free, long term operation and is backed by our seven year warranty.
– 2 – INPUT The 9303 and 9505 have input jacks for both balanced and unbalanced input signals. The unbalanced inputs use conventional RCA phono jacks. When using the RCA inputs, the rear panel BALANCED/UNBALANCED switch must be set to the UNBALANCED position.
– 3 – O PERATION POWER SWITCH The POWER switch is located on the front panel of the amplifier. An internal lamp indicates when it is turned on. Standard practice is to turn the amplifier on last and off first when switching components individually to prevent sending damaging transients, generated in the source components, to the speakers.
– 4 – S CHEMATIC D IAGRAM NOTES: Unless specified otherwise 1. All resistors in ohms 2. All capacitors in microfarads 3. Component Designators: 1-99: Left Channel 101-199: Right Channel 201-299: Common Parts 301-399: Chassis/Power Supply 4. Left Channel Only Shown 5.
– 5 –.
– 6 – PC B OARD L AYOUT.
– 7 – P ARTS L IST DESIGNATOR VALUE PART # R213 220, 1/4W, 5% RM/4-221C R214 220, 1/4W, 5% RM/4-221C R215 10k, 1/4W, 5% RM/4-103C P1, P101 200, Trim Pot RVH-201 P2, P202 200 Trim Pot RVH-201 D1, D.
– 8 – DESIGNATOR VALUE PART # Q8, Q108 MMBT5087L SS-0115 Q10, Q110 MMBT5088L SS-0114 Q11, Q111 MMBT5087L SS-0115 Q12, Q112 MMBT5088L SS-0114 Q13, Q113 MMBT5087L SS-0115 Q14, Q114 MPS-A56 SS-101A Q.
T ECHNICAL R EFERENCE THEORY AND OPERATION OF trans• nova The ( TRANSconductance NOdal Voltage Amplifier) principle is based on our 1984 U.S. Patent 4,467,288. This patent describes the advantages of audio power amplifiers in which a MOSFET output stage is connected in a grounded source configuration.
– 10 – The final output stage utilizes lateral MOSFETs; four pairs are used for each channel in the 9505 and three pairs in the 9303. These devices, unlike conventional bipolar transistors do not exhibit “ thermal runaway.
S ERVICE P OLICY AND L IMITED W ARRANTY If you encounter any difficulty or have any question concerning your 9303 and 9505 Amplifier, please call our Technical Support Department weekdays, 8:00 a.m. to 3:30 p.m., Mountain Standard Time, at 800-795-2385.
MAN-0587-D 4/95 HAFLER PROFESSIONAL A DIVISION OF ROCKFORD CORPROATION 546 SOUTH ROCKFORD DRIVE TEMPE, ARIZONA 85281 U.S.A. IN U.S.A. (602) 967-3565 IN EUROPE, FAX (49) 4207-801250 IN JAPAN, FAX (.
An important point after buying a device Hafler 9303 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Hafler 9303 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Hafler 9303 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Hafler 9303 you will learn all the available features of the product, as well as information on its operation. The information that you get Hafler 9303 will certainly help you make a decision on the purchase.
If you already are a holder of Hafler 9303, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Hafler 9303.
However, one of the most important roles played by the user manual is to help in solving problems with Hafler 9303. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Hafler 9303 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
