B&K 1794 instruction manual Poor Load Regulation, CV, CC, LED not Glow

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( J ) POOR LOAD REGULATION.

POOR LOAD REGULATION
Load Terminal Nut inside Unit
might be Loose.
N
Is there any Oscillation	Y	Reduce Resistor R6 ( 2.2K ) on
in CV Mode ?		F/Panel PCB until Oscillation dies
N		OUT. If Oscillation still Prevail
N		reduce R9 to 2K on F/Panel PCB.
		reduce R9 to 2K on F/Panel PCB.
Is Capacitor C4 and C2 Leaky ?
Y
Replace It.

1.Load Terminal might be Loose. Ensure Terminals are tightened properly with Terminal Nuts inside the Unit.

2.There might be Oscillation at Output in CV Mode. Adjust Resistor R6 & R9 until Oscillations die out.

3.Check Capcitor C4 and C2 on PREG PCB. It might be Leaky.

( K ) CV, CC, LED NOT GLOW.

1.Check the LED's. it might be Leaky, Open or Short.

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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 SummaryFor 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