B&K 1794 instruction manual PS-AUX-DC-L1791-0503 PCB Assly, PS-PWR-L1791-0703A PCB Assly

Page 32

4.PS-AUX-DC-L1791-0503 PCB ASSLY

Reference

Part

Reference

Part

Designator

Description

Designation

Description

CAPACITORS

 

 

 

C1

470µF/35V, ELE

C8

100nF, 50V, DISC

C2

47µF/35V, ELE

C9

470µF, 35V, ELE

C3

10µF/35V, ELE

C10

470µF, 35V, ELE

C4

10µF/35V, ELE

C11

220µF, 35V, ELE

C5

100nF/50V, DISC

C12

100nF, 50V, DISC

C6

Not Used

C13

100nF, 50V, DISC

C7

Not Used

C14

10µF, 35V, ELE

ICs

 

 

 

U1

LM 78T12

U3

LM 7805

U2

LM 7905

U4

LM 7812

BRIDGE

 

 

 

BR1

W06M, 600V, 3A

 

 

DIODES

 

 

 

D1

1N4007

D4

1N4007

D2

1N4007

D5

Not Used

D3

1N4007

D6

Not Used

CONNECTORS

 

 

 

J1

J2.54ST/10, 10PIN SIL 2.54mm ST LOCK MALE

J1

J2.54ST/10, 10PIN SIL 2.54mm ST LOCK FEMALE

J2

J2.54ST/12, 12PIN SIL 2.54mm ST LOCK MALE

J2

J2.54ST/12, 12PIN SIL 2.54mm ST LOCK FEMALE

5.PS-PWR-L1791-0703A PCB ASSLY

Reference

Part

Reference

Part

Designator

Description

Designation

Description

RESISTORS

 

 

 

R1

0.1E, 3W, W/W

R10

100K, 0.25W 5% MFR

R2

0.1E, 3W, W/W

R11

100K, 0.25W 5% MFR

R3

0.1E, 3W, W/W

R12

100K, 0.25W 5% MFR

R4

0.1E, 3W, W/W

R13

100E, 0.25W 5% MFR

R5

0.1E, 3W, W/W

R14

100E, 0.25W 5% MFR

R6

0.1E, 3W, W/W

R15

100E, 0.25W 5% MFR

R7

100K, 0.25W 5% MFR

100E, 0.25W 5% MFR

R8

100K, 0.25W 5% MFR

100E, 0.25W 5% MFR

R9

100K, 0.25W 5% MFR

100E, 0.25W 5% MFR

ZENERS

 

 

 

R1-12

12V, ½W

 

 

TRANSISTORS

 

 

 

Q1-6

IRFP 150, MOSFET

 

MISCELLANIOUS

 

 

 

M7-8

M3 / M4 CLICK NUT

 

DQ1-3

ST MALE FASTNER 2 PIN

 

SQ1-3

MOUNTING

 

 

29

Image 32
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 Current Loading Output CapacitanceReverse Voltage Loading Terms in this Manual Terms AS Marked on Equipment Operators Safety SummaryUSE the Proper Power Cord Servicing Safety Summary For Qualified Service Personnel onlyDo not Service Alone USE Care When Servicing with Power onServicing shall be done only by Qualified personnel Section Service Instruction GeneralTrouble Shooting Techniques 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 RegulationPoor Load Regulation Poor Load RegulationCV, CC, LED not Glow External Programming Not OK External Programming not OKRemote Sense 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 AsslyBack Trough Assly Front Panel AsslyMain Chassis 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