B&K 1794 External Programming not OK, Remote Sense not OK, External Programming Not OK

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( L ) EXTERNAL PROGRAMMING NOT OK.

EXTERNAL PROGRAMMING

NOT OK
Is Pot connected across INT	N	Ensure 5K Pot connected
& COM OK ?		between INT and COM
Y		Terminal.
Y
Is there proper Continuity between
PROG Terminal and O/P +Ve ?
N

Ensure proper Connectivity.

1.Check whether 5K Pot is connected between INT and COM Terminal.

2.Check whether there is proper Continuity between PROG Terminal and Output Positive.

(M ) REMOTE SENSE NOT OK.

1.Check whether there are Oscillations at Output, when Remote Sense Switch is pressed. If Oscillations are present reduce Resistor R6 and R9 on Front Panel PCB, until Oscillations die out.

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Contents BK Precision Limited Two Year Warranty Table of Contents Output ON/OFF Switch Limit SettingSection General Information Description 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 Reverse Voltage Loading Output CapacitanceReverse Current Loading USE the Proper Power Cord Operators Safety SummaryTerms in this Manual Terms AS Marked on Equipment Servicing Safety Summary For Qualified Service Personnel onlyDo not Service Alone USE Care When Servicing with Power onTrouble Shooting Techniques Section Service Instruction GeneralServicing shall be done only by Qualified personnel Repairs & Maintenance Page REF. PCB no PIN no Parts Ordering & ReplacingPage Page Fuse Blows Fault Finding ProcedureFuse 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 Poor Line RegulationNo Current Control Poor Line RegulationCV, CC, LED not Glow Poor Load RegulationPoor Load Regulation Remote Sense not OK External Programming not OKExternal Programming Not OK Section Part List & Schematics L1791-FP-CNT-0603 PCB Assy1KPF/100V, Disc 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 AsslyMain Chassis Assly Front Panel 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