Bk-precision 1796 - Manual User Manual

Instruction ManualModel 1796 High Current Power SupplyB PRECISIONK

b) If performing adjustment in step (a) above does not remove oscillation,disconnect output capacitor C2(L1791-FP-CNT-1203 PCB) and connect

OPERATORS SAFETY SUMMARYThe general safety information in this part of the summary is for both operating &servicing personnel. Specific warnings

USE THE PROPER FUSE :To avoid fire hazard, use only fuse of the correct type,voltage rating and current rating as specified in the parts list for you

SECTION - 5SERVICE INSTRUCTION5.1 GENERAL :The instrument has been tested throughly and then released for dispatch. Nor-mally, the unit works sa

11checked by substituting a new component for it ( or one which has been checkedpreviously). However, be sure that circuit conditions are

5.3.6 If Fuse blows, connect the unit through a variable AC Source with a currentmeter and monitor the current at no load. If the current is very hi

5.4.3 VOLTAGES AT VARIOUS PINS OF IC LM324 IS AS FOLLOWS ( IC-101 ) :-IC PIN NO. VOLTAGES & CHECK CONDITIONSPIN1 -- 0V ( WHEN V POT KEPT AT MIN. P

your area. Before you purchase check the electrical parts list for the proper valuerating, tolerance and description.5.5.2 ORDERING PROCEDURE : When o

CAUTIONStatic discharge can damage any semiconductorcomponent in this instrument.This instrument contains electrical components that are suscep

6.6 FAULT FINDING PROCEDURE( A ) FUSE BLOWSFUSE BLOWS Is Line Voltage OK ? Adjust Proper Line Voltage. Is Fuse Rating OK ? Ins

Limited Two Year WarrantyB & K Precision Corp. warrants to the original purchaser that its product andthe component parts therof, will be fre

( B ) UNREGULATED O/P VOLTAGE UNREGULATED O/P VOLTAGE Is IC LM324 OK ? Replace the IC. Is Voltage Pot Open OR Replace the

( C ) NO OUTPUT VOLTAGE. NO O/P VOLTAGE Is IC LM324 OK ? Replace It. Is Voltage Pot Short ? Replac

( D ) NO DPM INDICATION. NO DPM INDICATIONIs Display Completely Blank ? Is Continuity between IC7805 & DPM OK ? Does Dis

( E ) DPM NOT READ ( 000 ). DPM NOT READ ( V & I ) ( 000 ) Is DPM IC 707 OK ? Replace It. D

( F ) UNIT NOT TAKE CURRENT. UNIT NOT TAKE CURRENT Is Current Set Preset R21 OK ? Replace It.

( G ) UNIT DIRECTLY GOES TO CC. UNIT DIRECTLY GOES TO CC Is Shunt Resistor open OR Replace Shunt Resistor

( H ) NO CURRENT CONTROL. NO CURRENT CONTROL Is Current Pot Open ? Replace it. Are Wires related to Current Pot OK ? Ensure prope

( J ) POOR LOAD REGULATION. POOR LOAD REGULATION Load Terminal Nut inside Unit might be Loose. Is there any Oscillation

( L ) EXTERNAL PROGRAMMING NOT OK. EXTERNAL PROGRAMMINGNOT OK Is Pot connected across INT Ensure 5K Pot connected

SECTION - 7PART LIST & SCHEMATICS1. L1791-FP-CNT-1203 PCB ASSYReference Part Reference PartDesignator Description DesignationDescriptionRESISTORSR

TABLE OF CONTENTS SECTION PARTICULARS PAGE NO.1 GENERAL INFORMATION 12 SPECIFICATIONS 23 INSTALLATION 34 OPERATING INSTRUCTIONS 55 SERVICE INST

1. L1791-FP-CNT-1203 PCB ASSYReference Part Reference PartDesignator Description DesignationDescriptionCONNECTORSJ1 J2.54 - 3MSL, 3 PIN SIL 2.54mm ST

2. PS-PREG-1791-0903A PCB ASSLYReference Part Reference PartDesignator Description DesignationDescriptionTRANSISTORSQ1 BC 109 Q4 BC 557Q2 MPSA12 Q5 BC

4. PS-AUX-DC-L1791-0903 PCB ASSLYReference Part Reference PartDesignator Description DesignationDescriptionCAPACITORSC1 470µF/35V, ELE C8 100nF, 50V,

6. FRONT PANEL ASSLYReference Part Reference PartDesignator Description DesignationDescriptionPOTVR1 5K, WWPOT VR3 500E, WWPOTVR2 1K, WWPOT VR4 50E, W

1. Power ON / OFF Switch. 6. Current Fine Control. 11. Output ON / OFF Switch.2. Voltage Coarse Control. 7. CV Mode INdication. 12. Output Terminals.3

1. INPUT FUSE HOLDER 3. INT / EXT PROGRAM TERMINAL 5 & 6. COOLING FAN.2. MAINS CORD. 4. PROTECTIVE GROUNDBACK PANEL LAYOUT32

TOP VIEW33

BOTTOM VIEW OF MODEL : 179634

FRONT PANEL CONTROL PCB OF 179635

POWER MODULE PCB OF 1790/179136

SECTION - 1GENERAL INFORMATION1.1 DESCRIPTION :The 1796 High Current Regulated D.C. Power Supply is completely solid and suitablefor bench operation

PRE REGULATOR / AUX. P/S PCBs 1790/179137

OPERATORS SAFETY SUMMARYThe general safety information in this part of the summary is for both operating & servicingpersonnel. Specific warnings

Service InformationWarranty Service : Please return the product in the original packaging withproof of purchase to the below address. Clearly sta

SN: 481-808-9-001 Printed in India(M-00297)B&K PRECISION CORP.22820 Savi Ranch ParkwayYorba Linda, CA 92887www.bkprecision.comB PRECISIONK

SECTION - 2SPECIFICATIONSOUTPUT VOLTAGE : 0-16V DC continuously variable with coarseand fine voltage controls.LOAD CURRENT : 0-50 Amp max., continuou

SECTION - 3INSTALLATION3.1 INITIAL INSPECTION :As soon as the power supply 1796 unit is unpacked, inspect for any damagethat may have occurre

3.8 INPUT TAP SELECTION FOR 230V OPERATION :In case of 230V operation please ensure the shorting links on the Tap Selectionboards are changed to 230V

SECTION - 4OPERATING INSTRUCTIONS4.1 TURN ON SETTING PROCEDURE :The following procedure describes the use of controls and indicators forConsta

4.4 If load considerations require that the output power distribution terminals be re-motely located from the power supply ,then the power supply o