B&K 1794 instruction manual

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5.3.6If Fuse blows, connect the unit through a variable AC Source with a current meter and monitor the current at no load. If the current is very high (more than 2 ampere or so ) load, check for Bridge Rectifier short or shorted Diode, or Secondary Winding short, etc

5.3.7If output voltage or current DPM's are not reading, check for loose connections especially in crimping, soldering, of Connectors.

WARNING

THE FOLLOWING SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY.TO AVOID PERSONAL INJURY, DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN

-OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO.

REFER TO OPERATORS SAFETY SUMMARY AND SERVICE

SUMMA

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Contents BK Precision Limited Two Year Warranty Table of Contents Remote Programming With External 5K Pot Output ON/OFF SwitchLimit Setting Section General Information DescriptionSection Specifications Section Installation Repackaging for Shipment Input TAP Selection for 230V OperationSection 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 USE Care When Servicing with Power on Servicing Safety Summary For Qualified Service Personnel only Do not Service AloneSection Service Instruction General Trouble Shooting TechniquesServicing shall be done only by Qualified personnel Repairs & Maintenance Page Parts Ordering & Replacing REF. PCB no PIN noPage Page Fault Finding Procedure Fuse BlowsFuse Blows Unregulated O/P Voltage Unregulated O/P VoltageNo O/P Voltage No Output VoltageNo DPM Indication No DPM IndicationDPM not Read Unit not Take Current Unit not Take CurrentUnit Directly Goes To CC Unit Directly Goes to CCPoor Line Regulation No Current ControlPoor Line Regulation No Current ControlPoor Load Regulation CV, CC, LED not GlowPoor Load Regulation External Programming not OK Remote Sense not OKExternal Programming Not OK 2P2W SW Push Button Section Part List & SchematicsL1791-FP-CNT-0603 PCB Assy 1KPF/100V, DiscPS-PREG-1791-0503 PCB Assly SW1 Grey Colour CAP for Push Switch SW2 SW3DPM/01 REV 01 X PS-PWR-L1791-0703A PCB Assly PS-AUX-DC-L1791-0503 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 Precision Corp Service InformationPrecision Corp