Line_6_AxSys_212_Service_Manual电路图.pdf

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1、 AxSys 212 Service Manual Version 1.1 June 5th, 1997 1996, 1997 Fast Forward Designs, Inc. This service manual contains confidential proprietary information. This manual may not be copied in whole or in part without written authorization of Fast Forward Designs, Inc. RadioFans.CN 收音机爱 好者资料库 Line 6 A

2、xSys 212 Service Manual.Page 2 Table of Contents Overview . 3 Checking the software version . 3 Re-initializing the edit buffer and global parameters . 3 Re-initializing all user programs . 3 Disassembling the Head . 4 Changing the software . 4 Changing the Power Amps . 5 Changing the Transformer .

3、6 Description of Circuitry . 7 Power Supply. 7 Audio Input. 9 DSP. 9 Audio Output. 9 Microcontroller. 10 User Interface . 10 Reset Circuit. 10 Accessing the test routines . 11 Descriptions of Test Routines . 11 Troubleshooting . 14 Software history . 14 Revision history and ECOs . 15 Schematics . 36

4、 Parts list. 40 RadioFans.CN 收音机爱 好者资料库 Line 6 AxSys 212 Service Manual.Page 3 Overview The AxSys 212 is a stereo guitar amplifier that processes the guitar signal digitally. This makes many aspects of it quite different than other tube or solid state guitar amplifiers. All of the controls that affe

5、ct the guitar sound are implemented in the software that is loaded into the digital signal processors. In order to become more familiar with how the AxSys 212 operates and the specifics of its features, we recommend reading the owners manual prior to performing any service functions. The two main co

6、mponents of the AxSys 212 are the wood box (with two 12 speakers) and the head (enclosed in an aluminum box). All of the electronics of the AxSys 212 are contained in the head. Checking the software version To check the software version of the AxSys 212 without opening the head, press and hold the b

7、utton next to the edit row labeled AUX/MIDI and the button next to the edit row labeled MAIN at the same time. The display will show the software version number. Re-initializing the edit buffer and global parameters Press and hold TUNER and COMPARE at the same time while turning the power on. Wait u

8、ntil the display reads “Edt” (edit) and then “CLr” (clear) to indicate that the edit buffer has been cleared. In addition to the edit buffer being cleared, all of the global parameters (global Aux settings, global noise gate settings, MIDI channel, and global Main controls) will be set to their defa

9、ult values. For more information on global parameters, please refer to the owners manual. Re-initializing all user programs Press and hold USER/PRESET and STORE SOUND at the same time while turning the power on. Wait until the display reads “PrE” (presets) and then “Str” (stored) to indicate that th

10、e all 128 Presets have been stored into the 128 User sound locations. WARNING: This procedure will erase ALL user program memory. Be sure that any user sounds that are desired to be retained are saved to another AxSys 212 or to a MIDI sysex storage device first. See the owners manual for more inform

11、ation on storing sounds via MIDI. RadioFans.CN 收音机爱 好者资料库 Line 6 AxSys 212 Service Manual.Page 4 Disassembling the Head Before proceeding, be sure the power is off and the AC cable is disconnected. You will also need to disconnect the two 1/4” speaker plugs from the rear panel. First locate two Phil

12、lips screws on each side panel of the amp cabinet (four screws total). These screws keep the amp head from moving side to side. Take out all four, making sure not to lose the finishing washers. Next, take out the two screws that hold the top handle. They provide the main support for the head (on new

13、er units you will see two additional screws on the top that also need to be removed). As you remove them, try to support the descending weight by lifting up on the head from behind. Carefully slide the chassis straight out from the back of the cabinet, being very careful not to tear the vinyl coveri

14、ng. Youll need to use two hands in order to ease both sides out evenly. Now that you have the amp head out, remove the eight screws that hold the bottom plate on the chassis. Some amps also have an additional support bracket (mentioned in ECO #3) that will also be removed when taking out these screw

15、s. Newer amps will have nine screws instead of eight, and will not have the support bracket. Changing the software Caution: When changing software, there is always the possibility that the user program memory could be erased due to electrostatic discharge. It is always a good idea to save the user p

16、rograms to a MIDI storage device before changing the software or performing any work on the Processor board. After disassembling the head, locate the EPROM at U14 on the Processor PCB (it is the only socketed chip, and will have a sticker on it indicating the version number). Notice which end of the

17、 EPROM has a notch; the EPROM socket has the same indented notch. Youll want the new chip to be oriented the same direction. Always double check to make sure the chip youre installing faces the same way as the socket. Carefully pry out the old chip with an EPROM puller or a flat screwdriver. Insert

18、the new chip in the socket; again remember to match the notched ends. Check to make sure all the chip legs are aligned with their female counterparts in the socket. Press the chip firmly in place from directly overhead. Now you can reassemble the amp by following the disassembly instructions in reve

19、rse. Plug the power cord in and then turn the amp head on while holding the Compare and Tuner buttons. This will reinitialize all of the global settings and the current edit buffer, but will not affect the user programs. If you want to erase and reinitialize all of the User programs as well, hold Pr

20、eset/User and Store together while powering on (please read “Re-initializing all user programs” above first). Line 6 AxSys 212 Service Manual.Page 5 Changing the Power Amps Note: On units prior to serial number A1-007719, the possibility of one or both power amps failing due to an over voltage on th

21、e AC input is slightly higher than normal. This is due to the slightly higher secondary voltage of the original transformer design, #4-49- 8604 (Line 6 part number 11-30-0010). If a power amplifier needs to be replaced on a unit prior to A1-007719, it is recommended that the transformer also be repl

22、aced (see next section). Follow the procedure in the section “Disassembling the Head” above. Remove the rear PC board by removing the screws holding the power amp devices, and the nuts holding the 1/4” jacks. Before unsoldering the power amplifiers (located at U1 and U2), note the horizontal spacing

23、 between the pins and the circuit board. When the new power amplifiers are installed, provide the same spacing. Remove power amplifiers from the circuit board. Using wire cutters, cut the pins on the power amplifier so the body can be removed. Remove the remaining pieces of the power amplifier pins

24、from the circuit board. Install new National LM3886TF power amplifiers, allowing some space between the pins and the circuit board. This reduces the possibility of shorts between power amplifier pins and the pads on the circuit board. If the serial number is prior to A1-008646, add a jumper on each

25、power amplifier between pins 1 and 5 (as further described in ECO #8). The jumper should be soldered on the bottom side of the circuit board. Use 26 gauge or larger wire. See bottom of board diagram below: 1357911 108642 Jumper Place circuit board back into chassis, being sure to apply thermal greas

26、e between the power amplifiers and the rear metal panel. Replace black hex nuts and power amplifier mounting screws. Line 6 AxSys 212 Service Manual.Page 6 Changing the Transformer On units prior to serial number A1-007719, a dual primary transformer with a slightly higher secondary voltage was used

27、. If power amplifier failure occurs, the transformer should be replaced with transformer number 4-49-8607 (part # 11-30-8607) for 100/120VAC, or transformer number 4-49-8609 (part # 11-30-8609) for 220/240VAC. First, disconnect all colored wires from the transformer. Remove the four screws holding t

28、he transformer in place and remove the transformer. Place re-enforced bracket (part #30-21-0012) on top of chassis where transformer sits. Place the gasket (part #30-40- 2825) on top of re-enforced bracket. Place the new transformer on top of gasket. See diagram below. TRANSFORMER RE-ENFORCEMENT BRA

29、CKET ADDED GASKET (Line 6 Part # 30-40-2825) Insert screws with lock washers and tighten. Reconnect colored wires to transformer as described in section (Description of Circuitry, Power supply). The black and gray wires should be removed. Line 6 AxSys 212 Service Manual.Page 7 Description of Circuit

30、ry Inside the head are two main printed circuit boards (PCBs) connected together with a 20 pin ribbon connector: the Processor board (including the small breakaway board for the input jacks) and the Power board (including the small breakaway board for the AC input). The Processor board contains all

31、of the digital electronics, including the microcontroller, memory, software EPROM, DSPs,(Digital Signal Processors) etc., and the ADC (Analog to Digital Converter) and DAC (Digital to Analog Converter). It also contains all of the front panel controls (buttons, LEDs, and potentiometers). The Power b

32、oard contains the power supply, and the two audio power amplifiers that power the speakers. It also contains all of the input and output connectors on the rear panel. Power Supply The power supply section is located on the Power board. 100V-120VAC or 220V- 240VAC is applied at IEC connector J9. SW1

33、is the power switch located on the rear panel. L1, L2, and C20 are used to filter RFI from the AC line. The power passes through fuse F1. The AC is then connected to the power transformer through four wires. For older units (serial numbers A1-005001 through A1-007718, which used transformer part num

34、ber 4-49-8604, our part number 11-30-0010), the position of these wires on the PCB at pad locations H1 through H6 determine whether the AxSys 212 is wired to receive 120VAC or 240VAC. The color of the wires connected to the transformer should correspond to the colors labeled on the PCB for the appro

35、priate line voltage, as follows: PCB Pad 120VAC 240VAC H1Grayno connect H2WhiteWhite H3no connectGray H4no connectBlack H5BrownBrown H6Blackno connect Units with serial number A1-00719 and above use one of two different transformers depending on the input voltage. For 100-120V AC, transformer number

36、 4-49-8607 (our part number 11-30-8607) is used. For 220-240V AC, transformer number 4-49-8609 (our part number 11-30-8609) is used. In both cases, the black and gray wires described above are no longer necessary. The wiring at the PCB pads H1-H6 should be as follows: PCB Pad Any AC H1no connect H2W

37、hite H3no connect H4no connect H5Brown H6no connect When replacing an older transformer with a newer one, the black and gray wires should be removed. Line 6 AxSys 212 Service Manual.Page 8 If the wires become disconnected from the transformer, they should be connected as follows: Transformer 4-49-86

38、04 (Line 6 #11-30-0010) 120V/240V BROWN WHITE BLACK GRAY BLUE RED YELLOW GREEN ORANGE REAR PANEL 4-49-8607 (Line 6 #11-30-8607) 100V4-49-8609 (Line 6 #11-30-8609) 220V BROWN WHITE BLUE RED YELLOW GREEN ORANGE CHASSIS BROWN WHITE BLUE RED YELLOW GREEN ORANGE CHASSIS 4-49-8607 (Line 6 #11-30-8607) 120

39、V4-49-8609 (Line 6 #11-30-8609) 240V BROWN WHITE BLUE RED YELLOW GREEN ORANGE CHASSIS BROWN WHITE BLUE RED YELLOW GREEN ORANGE CHASSIS In all cases, there are two secondary windings on the transformer, one with a center tap. The center tapped winding (connected through H7, H8, and H9) is connected t

40、o a full wave bridge rectifier D1, which generates the +35VDC and -35VDC used to power the power amplifiers, and are filtered via C15 and C16. These voltages will actually measure to be about 44 volts when no audio is being played at the speakers. The other secondary winding (connected at H10 and H11) is half rectified through D2 and filtered by C17 to Line 6 AxSys 212 Service Manual.Page 9 generate approximately +8VDC, and half rectified through D3 and filtered by C18 to generate approximately -8VDC. The +8VDC voltage i