B&K 1794 instruction manual No DPM Indication

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( D ) NO DPM INDICATION.

NO DPM INDICATION

Is Display Completely Blank ?

N

Does Display shows only dot Indication ?

Y

Is Continuity between IC7905 &

DPM's OK ?

Y

Is Continuity between ANGD & DPM's OK ?

Y

Is DPM IC OK ?

N

Replace It.

Y	Is Continuity between
	IC7805 & DPM OK ?
	N
	Ensure proper Continuity.
N	Ensure proper Continuity.

N	Ensure proper Continuity.

1.If there is no Indication at all ensure that there is proper Continuity between +5V Wire of DPM's and IC7805. It might be possible that +5V Wire Crimping might be loose or IC7805 might be Damaged.

2.It DPM shows only a Dot Indication. Check whether -5V from IC 7905 is reaching DPM's. It might be possible that -5V Wire Crimping might be loose or IC 7905 might be Damaged.

3.If DPM shows Dot Indication, check whether AGND ( Grey Wire ) is reaching DPM's.

4.If DPM shows Dot Indication, check DPM IC7107. It might be Damaged.

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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 Reverse Voltage Loading Output CapacitanceReverse Current Loading USE the Proper Power Cord Operators Safety SummaryTerms 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 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 Procedure Fuse 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 RegulationCV, CC, LED not Glow Poor Load RegulationPoor Load Regulation Remote Sense not OK External Programming 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 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