User manual VELLEMAN K8021 ILLUSTRATED ASSEMBLY MANUAL

[. . . ] Please read the included information on safety and customer service * Typographical inaccuracies excluded. Always look for possible last minute manual updates, indicated as `NOTE' on a separate leaflet. 1. 3 Soldering Hints : 1- Mount the component against the PCB surface and carefully solder the leads 2- Make sure the solder joints are coneshaped and shiny 3- Trim excess leads as close as possible to the solder joint AXIAL COMPONENTS ARE TAPED IN THE CORRECT MOUNTING SEQUENCE !REMOVE THEM FROM THE TAPE ONE AT A TIME ! 4 5% 1% COLOR= 2. . . [. . . ] RY8: VR05051AS or eq. q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q C1: 220p (221) C2: 220p (221) C3: 220p (221) C4: 220p (221) C5: 220p (221) C6: 220p (221) C7: 220p (221) C8: 220p (221) C9: 220p (221) C10: 2n2 (222, 2200) C11: 2n2 (222, 2200) C12: 8n2 (822, 8200) C13: 8n2 (822, 8200) C14: 100n (104, 0. 1, u1) C15: 100n (104, 0. 1, u1) C16: 100n (104, 0. 1, u1) C17: 100n (104, 0. 1, u1) C18: 100n (104, 0. 1, u1) C19: 100n (104, 0. 1, u1) C20: 100n (104, 0. 1, u1) C21: 100n (104, 0. 1, u1) C22: 100n (104, 0. 1, u1) C23: 100n (104, 0. 1, u1) C24: 100n (104, 0. 1, u1) C25: 100n (104, 0. 1, u1) C26: 100n (104, 0. 1, u1) C27: 100n (104, 0. 1, u1) C28: 100n (104, 0. 1, u1) C29: 100n (104, 0. 1, u1) C30: 2. 2uF C31: 2. 2uF 10. Pin header connector, cut at the indicated 5 pins 5 q SK8: 5P q SK9: 5P 11 Construction 11. Push button Mount them straight against the PCB surface ! q q q q q q q q T1: BC557 T2: BC557 T3: BC557 T4: BC557 T5: BC557 T6: BC557 T7: BC557 T8: BC557 q q q q q SW1: TS-04PV SW2: TS-04PV SW3: TS-04PV SW4: TS-04PV SW5: TS-04PV Remark: The metal part of these buttons are used as jump wire. Be sure not to test or use the unit without soldering these push buttons. 12. Mount him straight against the PCB surface ! L' SK. . q RV1: 100K q RV2: 100K J. . . R R' L q SK13: JCF3. 5 (3. 5mm jack) 12 Construction 15. The back side corresponds to the thick line. VR. . . q q q q q q SK1: MJ-523AG/R RED SK2: MJ-523AG/R RED SK3: MJ-523AG/R RED SK4: MJ-523AG/R RED SK5: MJ-523AG/R RED SK6: MJ-523AG/R RED q VR1 UA7815 q VR2 UA7915 q VR3 UA7805 16. Transformer. C. . . q q q q q q q q q q q q q q q q C32: 47µ C33: 47µ C34: 100µ C35: 100µ C36: 100µ C37: 470µ C38: 470µ C39: 470µ C40: 470µ C41: 470µ C42: 1000µ C43: 1000µ C44: 1000µ C45: 1000µ C46: 1000µ C47: 1000µ TRANSFORMER q TR1: TR8021, 9V-2x18V/ 6VA 13 Construction 19. Mains voltage selection RV. . . q RV3: STRK27103 (2x50K ALPS) CAUTION: This is a high quality potentiometer, handle it with care. 2. Mount the potentiometer onto the PCB, using two 6mm (0. 23") screws and M3 nut. Do not solder the potentiometer connections yet ! Use a piece of isolated brown wire to select the mains (outlet) voltage, as indicated on the PC board. q For 115Vac (100 to 120Vac) A jumper between A-B, and a jumper between C-D. B C Using a black marker, erase the not used voltage at the back of the unit. 21. Mains voltage connection preparation q Connect a 10cm blue wire to the point N of SK12. Later these connection will be soldered to the mains connector. 14 Construction 22. Short lead = Cathode or-- ! LD. . . CATHODE CAUTION: After bending the leads the long appearing lead will be the cathode! IMPORTANT Mount these LED's exactly like in the Next: Solder one lead, and check the drawing, otherwise some LED's will position, if necessary correct by heat- not fit correctly in the front panel. Last: Solder the second connection. First: Bend the leads exactly like the drawing. q LD7 L-424YDT 3mm C q q q q q q LD1 L-424YDT LD2 L-424YDT LD3 L-424YDT LD4 L-424YDT LD5 L-424YDT LD6 L-424YDT C FIG. Mounting the sub PCB support q Mount four 2cm (0. 8") M3 spacers at the indicated positions using four 6mm (0. 23") M3 screws. 16 Enclosure preparation 24. Enclosure preparation q Cut the thread in the holes for the enclosure feet in one of the aluminum profiles, using the supplied special M4 screw as a tap. q Mount the Feet on the aluminum profile, using two M4 hexagonal Allen screws. It is advisable to stick the protection adhesive onto the feet. FIG. [. . . ] This means that the +15V and ­15V are correct. ! CAUTION: Some points on the PCB are connected to the dangerous mains voltage. Disconnect the mains plug. Now insert the IC's into their sockets: q q q q IC1 NE5532 IC2 TLE2071 / OPA134 / OPA604 IC3 TLE2071 / OPA134 / OPA604 IC4 VK8021 / PIC16C54RC Offset adjustment: It is important that the output of the amplifiers are free of DC voltage therefore the offset voltage needs adjustment: Connect the unit to the mains. Use a multimeter and set it to the lowest voltage range (2Vdc or lower). Measure between GND (the metal bracket of the potentiometer can be used) and J8 (Left channel offset adjustment). [. . . ]