Hartke Ha3500 Service Manual
Mar 10, 2018 - Service manuals, schematics, eproms for electricaltechnician hartke gt60 amp sch hartke ha3500 power amplifier sch hartke ha5000 7000. Found on stages all over the world, the Hartke 3500 bass amplifier is back in classic black. Yet, it retains all the same rock-solid performance and features as the original that have made it one of the most popular bass amplifiers of all time.
Found on stages all over the world, the Hartke 3500 bass amplifier is back in classic black. Yet, it retains all the same rock-solid performance and features as the original that have made it one of the most popular bass amplifiers of all time. The 3500's unique circuitry ensures that every nuance of your bass performance is faithfully reproduced. Featuring two Pre-Amp input knobs, allowing custom blending of tube and solid state tone, and ten-band graphic EQ, the 3500 is ideal for the player who wants plenty of power and control. But we don't stop there.
A dedicated preset button allows you to set a equalization curve and two fully adjustable contour knobs provide even more shaping of your distinctive sound. A built-in compressor adds real 'punch' to your bass sound, and also allows you to smooth out volume differences between notes.Rugged construction and professional features make the 3500 totally road-worthy.
Two independent inputs accommodate both passive and active bass guitars. LEDs that show you the settings of the graphic equalizer in low-light environments as well as a two-color LED that continuously shows the status of the compression circuitry in response to your playing.Electronically balanced direct output provides routing signal to professional mixing consoles for both live performance and recording environments. A ground lift switch helps prevent hum or buzz from entering the signal, and a pre/post switch allows the direct signal to be derived either before or after the amp EQ section.With all the features you need for complete tonal control, along with ample power and rugged design, the 3500 will ensure complete bass euphoria no matter what kind of music you play.
Hi, let's start my first post with a dark problem.what happens when you plug the output of a HA3500 to the output of another amp? Well that's what I got on the table, a nice HA3500 whos confused owner plug to the output of a Peavey and turn both on. He told me the peavey smoked hard and the HA3500 got really hot, and blowed one of the fuses. Checking out the HA3500 I replaced the fuse and two power transistors shorted (one in B+ and one in B-, both with shorted base-colector-emitter), nothing else looked damage. Turn amp on and everything seem to work ok, but the power transistors got really hot while the fan got crazy trying to reduce inside temp.
After turning it off I let it cool down for ome checking. Turn it on again and try to measured NPN emitter voltages when the fuse blowed again and also 2 more transistor (one replaced before in B+ and another one in B-). So, I unsoldered power transistor base and feed the PCB with a +15&-15 in order to avoid working with too much power anblow something else. I took some voltage readings and it all looks messed up.
The driving NPN is getting -15 on its base and there is no sense voltage drops like 15V in a diode etc etc I have checked this other thread wich was very interesting but got no usefull hint yet: Anyone could help me or give me some hints were could be the problem? By the way, the schematic is in this address. If you can download it please let me know, I can e-mail it. The power module is on the up-right corner. Any suggestions? Yayati book pdf free download free. Thanks Jazz, actually that schem fits mine but using 2SC5200 & 2SA1943 for power transistors. I have checked all resistor, capacitors and diodes, working now on checking all the bjts.
Din't find anything wrong and still getting all that nosense voltages, I guess the board has a short somewhere but uneable to find it yet. Also I suspect IC301 is bad, I have to take it off the PCB and check all the SMD components. The initial idea was replacing all the power and driving transistors, but before that i want to get normal voltage readings in order to avoid blowing them just for turning on the amp.