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PR-102 STEREOPREAMPLIFIER

ASSEMBLY MANUAL

Revision 2p05

September 24, 2021

Summary of Contents for PR-102

Page 2: ...jumper 15 Install the voltage select jumpers 15 These Components Are Not Loaded 16 Power Supply Inspection 16 Section 4 Chassis Assembly and Power Wiring 17 Protect your PR 102 17 Install the feet 17...

Page 3: ...ion 45 Adding 12 dB of Attenuation to the CD Input 45 Adding no attenuation to the CD Input 45 Install the Small Capacitors 46 Install the Diodes 46 Install the Bypass Capacitors 46 Install the Integr...

Page 4: ...cal Assembly 68 Final Mechanical Assembly 68 Section 10 About the Preamp Architecture 69 Features 69 Gain Customization 70 Specifications 70 Appendix 1 Shielded Cable Preparation 71 Block Diagram 73 S...

Page 5: ...43 Figure 31 Align socket feature with silk screen 47 Figure 32 Correct orientation for P1 on the selector board 48 Figure 33 Mounting the input connector shield 50 Figure 34 Assembled Input Selector...

Page 6: ...Page 6 of 80 Figure 56 input selector page 3 79 Figure 57 power supply schematic 80...

Page 7: ...els from the source That combined signal is applied equally to both channels o In the new design the mono control combines the Left and Right channels with equal weighting That combined signal is appl...

Page 8: ...reed to hold Akitika LLC harmless for any injuries you may receive in its assembly and or use To prevent injuries Wear safety glasses when soldering or clipping wires to prevent eye injuries Always un...

Page 9: ...will replace for free any parts of a correctly assembled PR 102 that fail within one year of the date of purchase when the amplifier has been used in home stereo applications It is the responsibility...

Page 10: ...your chances of first time success Finish one PCB before you build the next A soup bowl is your friend Before you build a board carefully empty the parts for only that board into a broad flat light c...

Page 11: ...into a broad soup bowl as shown below The envelope might also be marked PR 102 power supply FYI the power supply did not change between the PR 101 and PR 102 In general you ll start with the component...

Page 12: ...Solder the leads on the back of the board 4 Clip the leads Track your progress by placing a check mark in the done column as you install each component Diodes Polarity is important Make sure that the...

Page 13: ...ation Value Rating Done C9 22 F 35 V electrolytic C10 22 F 35 V electrolytic C11 22 F 35 V electrolytic C12 22 F 35 V electrolytic C13 22 F 35 V electrolytic C14 22 F 35 V electrolytic Install the Fus...

Page 14: ...e holes to mount the regulator Tighten the hardware pretty well while keeping everything at right angles A nut driver is very handy tool for this step Follow the silk screen outlines and install each...

Page 15: ...e and solder it on the solder side Figure 7 Install AGND to BGND jumper Prepare two 22 AWG red wires as shown in Figure 8 One will be used to connect AGD to BGD The other two will be used for voltage...

Page 16: ...0 are not loaded in the standard kit assembly You will solder to some of these locations in later assembly steps but for now the assembly of the power supply is complete Power Supply Inspection Rechec...

Page 17: ...lips head screws these are zinc plated so will look silver Snug the screws but don t over tighten Installing the feet will protect the bottom of the chassis from damage Figure 11 Install 4 feet with 6...

Page 18: ...inted release paper from the die cut double sided sticky tape 6 Press the exposed sticky against the inside of the chassis centered behind the IR detector rectangular window The hole in the tape is ab...

Page 19: ...g clip mechanism Install these three items in the orientation shown in Figure 13 Make sure you get the orientation of the IEC power connector correct it s pretty well impossible to remove once install...

Page 20: ...ou have them in the right place before you push them on the terminals Locate the black unswitched power harness It has black wire with 3 FASTONs 1 Connect the blue 0 25 wide FASTON to the IEC power co...

Page 21: ...at there s only a little bit left to tuck into the corners 8 Insert a pair of small cable ties into the tie down points as indicated in Figure 14and lay the twisted pair over the cable tie forming the...

Page 22: ...harness It has white wire with 2 FASTONs 4 Connect the blue 0 187 wide FASTON to the switched outlet contact farthest from the chassis wall 5 The white 22 AWG wire will connect to the power supply PCB...

Page 23: ...wire of the twisted pair to the remaining top row switch contact 11 Make sure that the wires are formed to avoid the nearby ground stud Figure 15 Form switch wires to avoid the ground stud 12 Once th...

Page 24: ...utlet 5 Connect the red 0 187 wide FASTON to the center terminal of the switched outlet 6 Dress the long green wire toward the ground stud behind the switch as shown in Figure 17 Use two more cable ti...

Page 25: ...insulation from the end of both wires c Twist and tin both bare ends d Insert the brown wire into the power supply PCB hole labeled brown and solder the wire on the solder side Clip the extra on the s...

Page 26: ...from the transformer b Remove 0 25 of insulation from all three ends c Twist and tin all three bare ends d Insert the orange wire into the power supply PCB hole labeled orange and solder the wire on...

Page 27: ...installation Done Twist and tin the bare end of the 10 red wire Twist and tin the bare end of the 10 black wire Insert the tinned 10 red wire from the bottom of the power supply board into the TB4 ho...

Page 28: ...the solder side Cut off any extra lead length on the solder side 4 Install the power supply PCB into the chassis For now loosely install just one screw the 4 40x0 25 zinc plated silver colored SEMS sc...

Page 29: ...installed Prepare to Test the power supply Make sure that none of the unconnected ends of the power supply can contact any other wire That s why we left the unconnected ends with their insulation in...

Page 30: ...ack meter probe on one of the AGD terminals along the front edge of the power supply b Red meter probe on one of the P12 terminals along the front edge of the power supply 2 12V DC It should be 12 Vol...

Page 31: ...onent side of the controller PCB All the components except the LED s IR detector and switches are installed into this side of the PCB Figure 21 Silk screen of the component side of the controller PCB...

Page 32: ...n R26 499 Yellow white white black brown R28 499 Yellow white white black brown R29 499 Yellow white white black brown R30 499 Yellow white white black brown R31 499 Yellow white white black brown R32...

Page 33: ...T04 Hex inverter U7 SN74HC166 8 bit parallel in serial out shift register U8 SN74HC166 8 bit parallel in serial out shift register Caution Don t confuse U5 and Q1 They are both in very similar looking...

Page 34: ...Once RN2 is level solder the balance of the pins Install the Ferrite Beads FB1 and FB2 install just like resistors A ferrite bead is used to confine and contain the radio frequencies generated inciden...

Page 35: ...that the orientation of the connector matches Figure 23 Solder two corner pins and make sure that you ve got it right one more time before you solder the remainder of the pins Check to see that the c...

Page 36: ...Most of the remainder of the components will be installed on what has until now been the solder side of the board We will return to this side of the board later to install the last few components Inst...

Page 37: ...rmally open push button switch SW2 Normally open push button switch SW7 Normally open push button switch Use the same method to insert and solder in the rest of the switches Designation Description Do...

Page 38: ...a If the leads are uncut you ll see the cathode lead is shorter than the anode lead b If the leads are cut you can see the difference in the shape of the metal lead frame inside the green plastic of...

Page 39: ...7 D10 D7 2mm x 5mm green D8 2mm x 5mm green D9 2mm x 5mm green D10 2mm x 5mm green Use the procedure outlined above to install D11 D15 D11 2mm x 5mm green D12 2mm x 5mm green D13 2mm x 5mm green D14 2...

Page 40: ...take a little tweaking but stay calm and it will work just fine Notice the pattern of pushbuttons on the controller and the pattern of holes in the front panel Match the patterns and insert the contro...

Page 41: ...re for even protrusion of all the LEDs through the front panel Loosely install the 4 40 screws through the 4 holes in the corners of the controller PCB into the mounting standoffs on the chassis front...

Page 42: ...accompanying LED on the second will turn it off 7 Push the AMP A AMP B Tape 1 Mon and Tape 2 Mon buttons The first push should turn the accompanying LED on the second will turn it off Test the Remote...

Page 43: ...the PR 102 Figure 30 Silkscreen side of the Input Selector Board shows component locations Install the Resistors Install the resistors using the same procedures outlined in the previous section If yo...

Page 44: ...R7 1K Brown black black brown brown R8 1K Brown black black brown brown R9 1K Brown black black brown brown R10 1K Brown black black brown brown R11 1K Brown black black brown brown R12 1K Brown blac...

Page 45: ...y find your volume control crowded to the counterclockwise end to produce low listening levels You won t have to advance the volume control as far to produce loud playback Adding 12 dB of Attenuation...

Page 46: ...een Designation Value Description Done D1 1N4004 1 Amp 400 PIV diode D2 1N4004 1 Amp 400 PIV diode D3 1N4004 1 Amp 400 PIV diode D4 1N4004 1 Amp 400 PIV diode D5 1N4004 1 Amp 400 PIV diode D6 1N4004 1...

Page 47: ...rcuit Sockets Figure 31 Align socket feature with silk screen We ve supplied IC sockets for the op amps that have gold plated pins They may be found in the PR102 Opamp Sockets envelope You ll install...

Page 48: ...e careful to get them all Alternatively if you still have a piece of cardboard handy from the transistor installation you can do the same trick 1 Insert all 16 relays into the PCB 2 Place a piece of c...

Page 49: ...transistor T0 92 package Install the Tall Film Capacitors Designation Value Description Done C12 1 F Film capacitor marked 1J63 on top C13 1 F Film capacitor marked 1J63 on top C14 1 F Film capacitor...

Page 50: ...ad zinc plated SEMs screws with built in lock washers The following figures show the details on an otherwise mostly bare input selector board so you can easily see how it all goes together Note that y...

Page 51: ...round in a later step Figure 34 Assembled Input Selector board some kits have black relays Install Input Selector Signal Wiring If you re not experienced with the preparation of shielded cable please...

Page 52: ...d tin all of the conductors and drain wires on the 5 pieces of shielded cable 22 ends in total Cut pieces of the outside gray jacket You ll insulate each drain wire with these pieces Select one of the...

Page 53: ...TB7 GND terminal Insert it from the component side and solder it on the solder side Install Input Selector Power Wiring These steps refer to the gray jacketed wires and green wire that connect to TB3...

Page 54: ...oles in the back panel Wiggle the board until the jack insulators fit through the back panel holes and the 4 PCB mounting holes line up with the 4 standoffs in the chassis Insert a 4 40x1 4 Phillips S...

Page 55: ...Connect one end of the cable into the accompanying socket on the input selector PCB Don t force the connector if it doesn t go re check the connector s orientation 5 Connect the other end of the cable...

Page 56: ...rsion of the Tone Volume board as described in revision 1p17 of the manual In that case please build from 1p17 If they do match continue building using the latest rev 2pXX manual Figure 37 Silkscreen...

Page 57: ...own R18 100K Brown Black Black Orange Brown R6 100K Brown Black Black Orange Brown R7 100K Brown Black Black Orange Brown R28 100K Brown Black Black Orange Brown R29 100K Brown Black Black Orange Brow...

Page 58: ...in the part to the notch in the silk screen The notched end of IC6 goes next to C17 Figure 38 orientation of IC6 Designation Value description Done IC6 SN754410NE motor driver Install the Diodes Insta...

Page 59: ...ation Description Done IC1 8 pin gold plated socket IC2 8 pin gold plated socket IC3 8 pin gold plated socket Install the Bypass Caps Install the 0 1 F ceramic bypass caps These caps are small and tan...

Page 60: ...tion as shown in Figure 40 Figure 40 Carefully note the connector orientation Install the remaining non polar capacitors Designation Value Marking description Done C1 22nF 22nJ100 C4 22nF 22nJ100 C2 4...

Page 61: ...tion rating function Done T1 2N3904 40 volt NPN tone control relay T2 2N3904 40 volt NPN hush relay T3 2N3904 40 volt NPN mono relay Install the tone control pots As previously noted with other multi...

Page 62: ...used to attach the volume balance bass and treble controls to the front panel On some kits you may find that this hardware is already in place on the ends of the pot shafts Designation Done Pot 1 shaf...

Page 63: ...Install the Op amps If you installed sockets Install the 8 pin DIP ICs Align the half moon feature of the IC with the notch in the PCB silkscreen If you need a reminder see Figure 35 Double check the...

Page 64: ...Page 64 of 80 Figure 45 Tone volume board viewed from directly above...

Page 65: ...o front panel FP 1 8 phono jack Insert the jack into hole marked Front Panel Secure it with the provided nut per the detail in Figure 47 The orientation of the jack is not important Figure 47 Insertin...

Page 66: ...ert the tinned black wire into the NEG12 hole of the Tone Volume s J2 Insert the wire into the solder side of the PCB and solder it on the component side Double check the locations of the red and blac...

Page 67: ...5 Fasten the board in place with 2 4 40x1 4 nuts 6 Fasten the controls in place using the nuts and washers from step 2 The nuts may have slightly different outside diameters If so use the larger outs...

Page 68: ...Tone Volume PCB 9 Push the MONO button on the front panel Each push should produce a soft but audible mechanical thump from the MONO relay on the Tone Volume PCB 10 Point the remote control at the PR1...

Page 69: ...the preamp and secure it with 11 4 40x3 16 black oxide screws 6 Your PR 102 preamp is ready for use Section 10 About the Preamp Architecture Features The PR 102 preamp has a very flexible design It fe...

Page 70: ...or your normal listening levels Should this be the case you can reduce the gain of the preamp by about 6 dB if you remove R3 and R5 from the tone volume board If the preamp is already built the easies...

Page 71: ...otate the cable along its long dimension This creates a scored line through the plastic jacket With a sharp blade not much pressure is needed You may need a bit of practice to get the feel 3 If you ve...

Page 72: ...the plastic wrap from the red and black wires The drain bare wire red and black wires are exposed now that gray insulating jacket foil shield and plastic over wrap have been removed 7 Save the gray ou...

Page 73: ...bines the left and right signals into a common signal From there the signal in either stereo or mono form passes through the HUSH relay to the volume control When hush is activated the signal level ou...

Page 74: ...Page 74 of 80 Schematics Figure 51 Tone Volume schematic...

Page 75: ...Page 75 of 80 Figure 52 Controller Schematic page 1...

Page 76: ...Page 76 of 80 Figure 53 Controller Schematic Page 2...

Page 77: ...Page 77 of 80 Figure 54 Input selector page 1...

Page 78: ...Page 78 of 80 Figure 55 Input selector page 2...

Page 79: ...Page 79 of 80 Figure 56 input selector page 3...

Page 80: ...Page 80 of 80 Figure 57 power supply schematic...

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Summary of Contents for PR-102

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AkitikA PR-102, Assembly Manual, Page: 1 / 80

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Summary of Contents for PR-102

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