User manual VELLEMAN PCS32

[. . . ] R28: 470R (yellow, violet, black, black, brown) (MA470E0) R13, R23: 10K (brown, black, black, red, brown) (MA10K0) R12, R22: 91K (white, brown, black, red, brown) (MA91K0) R6, R17: 910K (white, brown, black, orange, brown) (MA910K0) R33, R40: 3R3 (orange, orange, black, silver; brown) (MA3E3) Mount the diodes (watch the polarity!) D1. . . D26: 1N4148 (1N4148) D13, D21: 1N4000. . . 4007 (1N4007) Mount the adjustable resistors RV1, RV4: 100ohm multiturn (E100TW or E100TY) RV3, RV6: 4K7 (5K) (K004SH) Mount the IC sockets IC15, IC22: 24P Mount the capacitors 22 / 04 / 1996 PCS32i Assembly & Calibration Manual 8 C89, C90: 10P (C10) C86, C87: 100P (101) (C100) C3, C8: 100P (101) (C100) C14, C20: 150P (151) (C150) C17, C26: 1N5/400V!(152, 1500) (5MQ1. 5) C15, C21: 2N2 (222) (C2N2) C4, C5, C9. . . [. . . ] (WOMY) · Use 5cm + 7cm of black cable to connect the ground of the PCB ( J2-J4 ) to potentiometers and to continue. (WOMBK) 22 / 04 / 1996 PCS32i Assembly & Calibration Manual 14 · Mount the rear panel. Fasten the SUB-D connector with its two own bolts. (CKRPCMK2) · Mount the clamp and IC23 voltage regulator 7805 . Be carefull not to damage the regulator, use 10mm bolts, lock washers and nuts. Solder regulator leads AFTER fixation. Nut M3 MR3 Washer RM3K Isolator R/TO220 Volt regulator UA7805 Isolating mica M/TO220 Bend leads Bolt 10mm M3 BT30100 Use two 10 mm bolts, lock washer and nut to connect the clamp to the rear panel. Do not forget to use plenty of silicon compound ! · 2x BT30100 + 2x RM3K + 2x MR3 22 / 04 / 1996 PCS32i Assembly & Calibration Manual 15 Degrease the alu frontpanel with a non-aggresive solvent ( eg alcohol). Stick the frontpanel-foil carefull on the alu panel. Make sure it is perfectly centered. (FPCMK2 + FPPCMK2) Cut the excess border from the front sticker · Mount both BNC connectors on the front panel. Make sure they are mounted in upright position. now IN PLASTIC!!(BNCICHAS) · Fasten the switch onto the sub chassis as shown. REMOVE PROTECTIVE FILM FROM SUB CHASSIS IF PRESENT! (CHPCMK2 + BT20100 + BUS05 + MR3 + MR2 + RS-4) 22 / 04 / 1996 PCS32i Assembly & Calibration Manual 16 Preparation of the screening foil: (CKSPCMK2) Isolate the edge of the foil by means of tape, first bendover the foil: Adhesive tape Coductive side Isolated side · Put the screen foil between potentiometer and subchassis . · Fasten the subchassis on both potmeters. Do not fasten bolt to tight, it will need adjustment later. 22 / 04 / 1996 PCS32i Assembly & Calibration Manual 17 Connect BNC GND (black wire) and signal (yellow wire). · Guide both yellow switch leads trought the center hole and connect to the switch. Isolation, cover both contacts 22 / 04 / 1996 PCS32i Assembly & Calibration Manual 18 Pre Testing Check the following voltages after supplying power supply. All voltages are measured with respect to ground (use test point J11 as ground). · Connect a voltage of 9 - 12VDC/700mA to the DC connector (check the polarity). · Measure around -6V on pin 4 of IC33. · Measure around 6V on pin 7 of IC33. · Measure around +5V on pin 16 of IC1. 6V IC33 & IC34 0 mV IC1 -6V 5V Adjust the following offset voltages · Set input selector switch to GND of both channels · The voltages are measured with respect to ground, point J2. · Measure pin 3 of IC33 and adjust RV1 until the voltage is 0mV. · Measure pin 3 of IC34 and adjust RV4 until the voltage is 0mV. 22 / 04 / 1996 PCS32i Assembly & Calibration Manual 19 Calibration: Install the software Connect unit with printer port LPT1 of computer. This is an MSDOS program but can generally be run from Windows. Set the TIME/DIV switch to 1ms by using the mouse, (click on the figures). [. . . ] Use an insulated screwdriver (small metal tip is allowed). Channel 1: Set the VOLT/DIV switch to 1V. Adjust CV3 until the top of the square wave is as flat as possible. Adjust CV4 until the top of the square is as flat as possible. [. . . ]