LCAudio-ZapsoluteMK4_1-pwr-sm 维修电路原理图.pdf

《LCAudio-ZapsoluteMK4_1-pwr-sm 维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《LCAudio-ZapsoluteMK4_1-pwr-sm 维修电路原理图.pdf（14页珍藏版）》请在收音机爱好者资料库上搜索。

1、Building instruction for ZAPsolute Mk4.1V.2.0Misc. information.The two channels have to be mechanically separated in order for the amplifier to fit into the casing.The frontpanel is prepared for a display unit, you will automaticly receive when it is developed. Until then we suggest You mount some L

2、ED s behind the window. You can set modes using the switches on the rear panel.Tools.Bitscrewdriver or screw machine.T6 bit ( or T6 screwdriver ).T10 bit.T20 bit.Cutter (small model).Component bending tool with 4, 5 and 8 modules (0,1” ).Soldering iron, normal tip.Screwdriver with a straight 2-4 mm.

3、 Head.Multimeter with mV range.Wrenches with 7, 8 10, 12 and 14 mm. Gaps or adjustable gap.Crimptool (as used for auto works).Screw types.Mounting guide:RadioFans.CN 收音机爱 好者资料库1.Start by mounting all the low parts, and jumper pins ( 2 golden pins with black plastic holder).Mount RGND ion both channe

4、ls ( 2R2 red red black silver brown, 5 modules ) Mount RZ+ and RZ- in both channels ( 2k0 red black black brown brown, 5 modules )Resistors can be turned anyway desirable, but it looks nicer if allTurn the same way. RZ+ and RZ- determine the input impedance, You mayWant to use another value than pos

5、ted here. Look later in this paper.Mount 12 pcs. 0R27 1W des. RE1- RE6 in both channels. ( 0R27 = red violet silver gold, 8 modules )Mount the optocoupler in both channles, it fits next to the 500R BIAS trimmer.The optocoupler is a small 4 pin IC marked SHARP PC817.The round dot should be farthest a

6、way from the heatsink.Mount P1 ( BIAS trimmer ) in both channels. It is a 500 Ohm value, marked 501.Mount P2 ( DC trimmer ) in both channels, it is 10 k value marked 103.Mount D309-D316 and D409-D416 all BYV36E, looks like a grey pearl on a wire,With a black line marking. This marking should fit wit

7、h thePrinting on the PCB IMPORTANT, all the diodes should beOriented in the same direction, as printed.4 modules.Mount R301 - R320 (interrupted line of numbers) and R401-R416 total of 32 powerResistors value 0,1 Ohm on power supply board. They are black ceramicParts with marking DALE (Vishay) printe

8、d on them. 8 modules.These resistors are a little wider than the PCB symbol, but will fit in easily.Mount C313, C314, C413 and C414, 1uF 250 V MKT, Dark Gray plastic component marked 1K 250. This is a non polar component.Mount the two relays, near the input terminals, at rear end of each channel s P

9、CB.Turn the relay in the direction that the line on the component fitsThe line on the PCB symbol.Mount T9, BC517 in both channels. It is to be located right between the two driverTransistors, and the output transistors, at the heatsink edge of the PCB.The flat side of BC517 goes towards the PCB edge

10、. Mount BC517 as high as the pins allow.Mount C134 and C234, 1uF MKT (light blue color). Non polar component.Mount jumpers. A jumper consist of two golden pins held together by a black plastic intersection.In the standard setup You always have to short the jumper ProtectionSo You might want to just

11、jump it with a soldered wire. If You choose to mount the jumper, it gives You the option to disconnect the protection function. (Not recommended).Mounting the jumper DC Servo is a very good idea, because You might need to Switch this function in and out for adjustments.The S.A. jumper stands for Sta

12、nd Alone. You only need to short this jumper ifYou want to break off the controller board, and run the ZAP as a clean Amplifier with no control functions. Usually not used.The Auto jumper places the ZAPsolute in constant Auto Power Down mode.RadioFans.CN 收音机爱 好者资料库This means that when You listen to

13、music, the amp runs in pure Class A, but After 5 minutes without music, it automaticly switches the bias current down to A power saving mode. Normally You would place a switch on the rear panel toControl Class A / Powerdown mode, so You dont need to mount the Auto Jumper, if this is what You want. S

14、o if You want to take any future setup possibility into account, mount all the jumpers, else just mount the most likely one: DC Servo and short out the Protection with a soldered wire.Mount the 4 screwterminal blocks. They fit in between the dark gray 1K250 capacitors, You mounted a few minutes ago.

15、 Remember the holes for wire connection (For the transformers) should go towards the edge of the PCB. Screw the M4 X 18 mm. Spacers onto the power supply PCB, using screw no. 7. There must be no short between any screw or spacer and a PCB soldering or wire end.Mount the output transistors, drivers a

16、nd predrivers in the PCB without soldering them in. The metal sides should go towards the PCB edge, and the text should face the middle of the PCB. Place the heatsink, close to the output transistors, in the upright position, with the drilled holes downwards.Screw on the output transistors, drivers

17、and predrivers, so the distance from the PCB underside to theTable underneath is similar to the metal spacers mounted on the PCB.Remember to use insulation pads (orange Kapton sheets) on the output transistors. Check for any impurities between the transistor, the Kapton pads and the heatsink. No hea

18、tsink compound should be applied, it is already impregnated on the kapton sheets.Tighten the screws good, of course without breaking them.Use screw no. 6 for the small drivers, no. 3 for the big drivers and midst Hole in the output devices ( SANKEN), and no. 5 for the output devices Side holes. All

19、screwholes have to be used, none must be left unfastened!Should You break a screw it is very important that You remove the broken piece from the heatsink, and apply a new screw. This is easily done by removing all transistors, and kapton sheets, and then with an oldCutter turning the broken screw co

20、unter clockwise. The long no. 3 screws are used to fasten the drivers to the output devices. If Your Mk4 is bigger than 50 Watts, a small heatsink plate should be mounted between drivers and output devices. In this case remember to use mica sheets for isolation, heatsink compound is allowable but no

21、t nessescary.Solder all the power transistors, check that the heatsink is precisely 90 degree angled to the PCB.Mount the 4 pcs. 22 uF MCAP capacitors. They can be easily mounted from the top side of the PCB.Mount the other larger components, remember to polarize the 10000 uF / 50 V electrolytics as

22、 shown on the PCB symbols. Failing to do so, may cause small explosion of the electrolytic. Mount the 16 Schottky Rectifiers on their heatsinks, remember to remove the plastic liner from the aluminum plate before fastening any diodes. Fit the rectifiers neatly, so the will slide into the PCBWith no

23、bending of the pins. All the rectifiers should be mounted so they are visible from theScrew terminal side, the heatsinks should be closer to the electrolytic capacitors.Mount the ULC heatsinks on top of the SMD transistors, between the two blue preset resistors. The screw should be mounted from the

24、top side of the PCB not the bottom side. Tighten until the heatsink presses a little against the transistors, no more.Now mount the input / output wiring, and switch wires. Place rubber feet on the corners of the bottom plate. (the one the most holes in it)Fasten the heatsinks to the bottom plate, u

25、sing screw no. 1 for the heatsinks themselves, and no. 7 for the metal spacers. Wait with the tightening of any screws, until all screw have caught their rivets.Also fasten any unused heatsinks, or extension heatsinks using screw no. 1.Mount the terminals on the rear panel.All holes are made to fit

26、to the terminals, use screw no. 4 for the XLR receptors. The PUSH button should go upwards.The white (Gnd) speaker terminal is placed nearest the RCA plugs.The Fuse holder of the mains entry, goes downwards.Fasten the back panel to the bottom plate using screws no. 1.Connect the wires from the PCB.M

27、ount brackets and front glass to the front plate.Use screw no. 2 for the brackets, and no. 4 for the front glass, be careful not to overtighten the front glass screws. A squeek will sound when they are fastened properly.Fasten the front panel to the bottom plate using screws type 1.When mounting the

28、 transformers on the bottom plate, it is important You use rubberplates both under and over the transformer. If You dont the metal plate will cut through the insulation causing a short circuit.The larger transformers should be connected to the MAIN screwterminals, the smaller transformer goes into t

29、he AUX terminals. If the main transformers have uninsulated ends longer than 10 mm. They should be cropped to about 8 mm. Length. Use an old one, instead of You brand new Lindstrom 8140 ultra flush cutter.Mount the transformer wires in the following order from left to right: Yellow - Orange - Red -

30、BlackApplies to both MAIN and AUX transformers. Some AUX transformers brand name PETRA have different Color codes:Yellow - Green - Pink - BlackThe AUX transformers should not be tightened to hard in the terminals, as this may cause the wires to break.Mount the primary wires (brown and blue) to the m

31、ains DC filter. All Brown ones in one out post, and all blue ones in the other one. Put the thin wires in first, it makes it a lot easier!Connect the two in posts to the mains inlet so the brown transformer leads end up being hooked to the L terminal on the inlet, and the blue ones to the N .If You

32、do not have a dual mono version with a total of 4 transformers, You should now connect each of the three pads on the power supply PCB, just beside the rectifiers, to the corresponding pad on the other channel. No mirroring!Fasten the DC filter to a heatsink as shown, it should be very secure, and th

33、e capoacitor must NOT be able to touch any cabinet part, when You put the lid on the case. You can tighten the spacer by holding the screw in the groove with a screwdriver while turning the spacer with a wrench. Then at last You tighten the screw holding the filter PCB.Fit a fuse into the mains inle

34、t, use a 4 AT if You have one main transformer, and a 8 AT if You have two. Main transformers. Connect a wire from the mains switch to the mains inlet as shown here:Adjusting BIAS current.Put You test leads into the holes just beside the 0R27 emitter resistors as shown on the photoApply mains power

35、to the inlet.Adjust BIAS preset to :50W version250 mV78W version191 mV(also dual mono version)118W version112 mVWait some 20 minutes and readjust.Summary Jumper setup:Jumper mountedJumper not mountedProtection:hort Circuit protection works.Short Circuit Prot NOT Functional.DC ServoDC Servo works.DC

36、Servo NOT functional.S.A. (stand Alone)Control board may be removed.No PCB part may be removed forSafe operation.AutoAlways in Auto Power Down mode.Mode as set by switch or alwaysPure Class A.NORMALLY You only mount the DC Servo jumper and also short out the Protection jumper.Power down mode Switch

37、should be connected to the three solder pads underneath the 22 uF MCAP s.Function:Up:Powerdown constantly.Middle:Class A constantly.Down:Autopowerdown.Input selection.If You are only going to use one input (RCA or XLR), it is best to connect it to the Direct input. You save a set of relay contacts i

38、n the signal path.RCA:Gnd - GndHot - +XLR:1 - Gnd2 - +3 - -There is also the possibility to switch between RCA and XLR inputs. The primary input (most used) is connected to Primary as listed above, while the secondary (least used) is connected to Secondary .Either input takes both XLR and RCA input

39、signals.Normally Youlisten to Primary input, to switch to Secondary short the two solder pads Input Sel.With a switch.Input impedance.RZ+ and RZ- determine the input load for + and - inputs.We have chosen 2k0 since this value works well with most preamps. If You have a Sidewinder preamp you can bene

40、fit from better cable adaption, by reducing RZ+ and RZ- to a lower value like 300 Ohms.If You have a tupe preamp it is a better idea to increase RZ + and RZ- to say 47 kOhms, but this calls for a high quality DC blocking capacitor of 1 uF in series with the hot signal lead. (Some 4 Hz Fc).LED s indi

41、cators.It is fully optional to connect LED s the ZAP will work even if no LED s are connected. You are not to short any unused LED indications.LED function:OKAll systems GO - Protection not activated.Cl.A.The Amp. Currently Running in Class A.Cl.A/B.The Amp. Currently running in Class A/B (Powerdown

42、).The longer pin of the LED goes into the + terminal, the shorter in -. It is NOT allowed to short all - terminals to use a common ground wire to the front LED s. You always have to connect both + and - wires to each LED.Extension Modules.The Terminal NPN Basis on the main board is connected to the

43、terminal NPN Basis on the ext. Board using a 0,5 sqr mm. wire. (Normally white)The Terminal PNP Basis on the main board is connected to the terminal PNP Basis on the ext. Board using a 0,5 sqr mm. wire. (Normally white)Power + on the main board is connected to V+ on the ext. Board with a heavy wire.

44、Power - on the main board is connected to V- on the ext. Board with a heavy wire.Power Gnd on the main board is connected to Gnd on the ext. Board with a heavy wire.BDT63 and 1k0 on the ext. Board should NOT be mounted!If You are using ext. Boards in a 78 or 118 Watt version, to drive a separate bas

45、s output ( the normal thing to do) You should connect a Zobel Network of a 100 nF / 400 V capacitor and a 2,2 Ohms 1 W resistor from Power Gnd to Output on the bass output ( as shown ). If You do not do this, using the one output with the other unconnected may cause oscillation, dangerous to the amplifiers health.