B&K 1794 instruction manual

Page 18

CAUTION

Static discharge can damage any semiconductor

component in this instrument.

This instrument contains electrical components that are susceptible to damage from static discharge. Static voltages of 1KV to 30KV are common in unprotected environments.

Observe the following precautions to avoid damage :

1.Minimize handling of static-sensitive components.

2.Transport and store static-sensitive components or assemblies in their original containers, on a metal rail, or on conductive foam. Label any packages that contains static-sensitive assemblies or components.

3.Discharge the static voltages from your body by wearing a wrist strap while han- dling these components. Servicing static-sensitive assemblies or components should be performed only at a static-free workstation by qualified service personnel.

4.Nothing capable of generating or holding a static charge should be allowed on the work station surface.

5.Keep the component leads shorted together whenever possible.

6.Pick up components by the body, never by the leads.

7.Do not slide the components over any surface.

8.Avoid handling components in areas that have a floor or work-surface covering capable of generating a static charge.

9.Use a soldering iron that is connected to earth ground.

10.Use only special anti-static suction-type or wick-type desoldering tools.

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Contents BK Precision Limited Two Year Warranty Table of Contents Section General Information Description Output ON/OFF SwitchLimit Setting Remote Programming With External 5K PotSection Specifications Section Installation Input TAP Selection for 230V Operation Repackaging for ShipmentSection Operating Instructions Readjust the current limit in the remote sensing mode Output Capacitance Reverse Voltage LoadingReverse Current Loading Operators Safety Summary USE the Proper Power CordTerms in this Manual Terms AS Marked on Equipment Do not Service Alone Servicing Safety SummaryFor Qualified Service Personnel only USE Care When Servicing with Power onSection Service Instruction General Trouble Shooting TechniquesServicing shall be done only by Qualified personnel Repairs & Maintenance Page REF. PCB no PIN no Parts Ordering & ReplacingPage Page Fault Finding Procedure Fuse BlowsFuse Blows Unregulated O/P Voltage Unregulated O/P VoltageNo Output Voltage No O/P VoltageNo DPM Indication No DPM IndicationDPM not Read Unit not Take Current Unit not Take CurrentUnit Directly Goes to CC Unit Directly Goes To CCNo Current Control No Current ControlPoor Line Regulation Poor Line RegulationPoor Load Regulation CV, CC, LED not GlowPoor Load Regulation External Programming not OK Remote Sense not OKExternal Programming Not OK 1KPF/100V, Disc Section Part List & SchematicsL1791-FP-CNT-0603 PCB Assy 2P2W SW Push ButtonSW1 Grey Colour CAP for Push Switch SW2 SW3 PS-PREG-1791-0503 PCB AsslyDPM/01 REV 01 X PS-AUX-DC-L1791-0503 PCB Assly PS-PWR-L1791-0703A PCB AsslyFront Panel Assly Main Chassis AsslyBack Trough Assly Front Panel Layout Back Panel Layout TOP View Bottom View of Model 1790 Front Panel Control PCB of 1790 Power Module PCB of 1790 PRE Regulator / AUX. P/S PCBs 1790 Service Information Precision CorpPrecision Corp