Fluke 12B Service Manual Download Page 15

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12B/18/7 Series

Service Manual

2-2

Table 2-1. Electrical Components on Main PCA

Circuit and Function

Component Designator(s)

Analog Measurement IC

Microcomputer IC

Input Divider and Ohms Reference Resistor Network

Input Divider AC Coupling Capacitor

J2 Input Receptacle Voltage Sense Resistor

J1 Input Receptacle Voltage Sense Resistor

Reference Voltage for Volts Measurements

A/D Converter Integrate Capacitor

A/D Converter Autozero Capacitor

A/D Converter Gain Resistors

Active Filter Components

Passive Filter Components

AC to DC Converter Gain Resistors

AC to DC Converter AC Coupling Capacitor

Bias Current Setting Resistor

DGND-VSS Voltage Setting Resistors

Power Supply Bypass Capacitors

Reverse Battery Protection

System Clock

Automatic Selection Input Current Limiters

Automatic Selection Input Positive Temp. Coef. Thermistor

Automatic Selection Input Voltage Clamp Circuit

Automatic Selection Input Fusible Resistor

Microcomputer Reset Circuit

On/Off and Automatic Selection Select Slide Switch

Beeper

Beeper Current Limiter

Slide Switch Protection

Switch Sense Bypass Capacitor

Input Divider Bypass Capacitor

Zero Ohm Jumpers

C14

R17

R14

VR1, R4, R5, R6, R26

R1, R3, R15

R7, R8, C5, C6

R9, C7

R11, R12, R13

R10, R24

C3, C15

CR1

R16, R18, R29

RT1

Q1, Q2, CR2, R28

R19

R23, R25, C10, C13, CR3

LS1

R22

C16

R20, R21, R27

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Summary of Contents for 12B

Page 1: ...18 7 Series Meters Service Manual PN 602730 August 1996 1996 Fluke Corporation All rights reserved Printed in U S A All product names are trademarks of their respective companies S t o c k C h e c k c...

Page 2: ...a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center or send the product with a description of the difficulty po...

Page 3: ...lection Input Resistance 2 3 3 Maintenance 3 1 Introduction 3 1 Disassembly and Reassembly 3 1 Cleaning 3 6 Performance Tests 3 6 Calibration Adjustments for Models 12B and 18 3 9 Calibration Adjustme...

Page 4: ...12 18 7 Service Service Manual ii S t o c k C h e c k c o m...

Page 5: ...t Table 2 4 3 1 Required Equipment 3 6 3 2 Performance Tests for Models 7 300 and 7 600 3 7 3 3 Performance Tests for Models 12B and 18 3 8 4 1 Manual Status Information 4 2 4 2 Models 12B 18 and 18 A...

Page 6: ...12 18 7 Service Service Manual iv S t o c k C h e c k c o m...

Page 7: ...mbled Unit 3 4 3 3 Removing and Reinserting the Printed Circuit Assembly 3 5 3 4 Calibration Adjustment 3 10 4 1 Models 12B and 18 Final Assembly 4 4 4 2 Models 7 300 and 7 600 Final Assembly 4 6 4 3...

Page 8: ...12 18 7 Service Service Manual vi S t o c k C h e c k c o m...

Page 9: ...Warning is reserved for conditions and actions that pose hazard s to the user Caution is reserved for conditions and actions that may damage your meter Avoid working alone Follow all safety procedure...

Page 10: ...vides the following information Specifications Chapter 1 Basic theory of operation Chapter 2 Disassembly and reassembly Chapter 3 Performance tests Chapter 3 Calibration Chapter 3 Illustrated parts li...

Page 11: ...to 70 35 C to 50 C Battery Type 9V NEDA 1604 or IEC 6F22 Battery Life 650 continuous hours with alkaline 600 hours for Model 7 450 continuous hours with carbon zinc 400 hours for Model 7 Shock Vibrat...

Page 12: ...k 40 00 k 400 0 k 4 000 M 40 00 M 0 1 0 001 k 0 01 k 0 1 k 0 001 M 0 01 M 1 5 2 NA NA NA NA NA 1 5 2 NA NA NA NA NA 0 9 2 0 9 1 0 9 1 0 9 1 0 9 1 1 5 3 K 1 000 F 10 00 F 100 0 F 1000 F 10000 F 0 001...

Page 13: ...J 600V rms or dc 1 5V dc 450 mV dc 1 5V dc 500 A L 2 600V rms or dc 2 4 3 0V dc 2 400V dc 0 95 mA typical 1 3 x 106 V Hz maximum 2 Does not apply to Model 7 3 2 k input impedance up to 50V Impedance i...

Page 14: ...erter Automatic Selection circuitry active filter passive filter power supply range configuration circuitry signal routing circuitry beeper driver digital control circuitry and digital U2 interface ci...

Page 15: ...oupling Capacitor Bias Current Setting Resistor DGND VSS Voltage Setting Resistors Power Supply Bypass Capacitors Reverse Battery Protection System Clock Automatic Selection Input Current Limiters Aut...

Page 16: ...ck slide switch position continuity check and Automatic Selection data The microcomputer performs math operations on the raw data from U1 and configures it for the LCD U2 also reads push button inputs...

Page 17: ...ed 19 AFO Active filter high output pin 2 pole low pass filter 20 FAO Internal active filter node 21 FAI Internal active filter node 22 AFI Active filter high input pin 23 VSS Negative power supply vo...

Page 18: ...d to common digital ground 47 DATA3 Most significant bidirectional data bus line 48 DATA2 Bit 2 of parallel data bus 49 DATA1 Bit 1 of parallel data bus 50 DATA0 Least significant bidirectional data b...

Page 19: ...12B 18 7 Series Service Manual 2 6 S t o c k C h e c k c o m...

Page 20: ...m 3 Using the procedures packaging and bench techniques that are recommended The following practices should be followed to minimize damage to S S static sensitive devices 1 MINIMIZE HANDLING 2 KEEP PA...

Page 21: ...EVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC FREE WORK STATION PLACING SHORTING STRIPS ON EDGE CONNECTOR HELPS PROTECT INSTALLED S S DEVICES 9 HANDLE S S DEVICES ONLY AT A STATIC FREE WORK STATION...

Page 22: ...input signals before opening the case Caution To avoid contamination from the fingers handle the pca by the edges or wear gloves PCA contamination can cause failures in humid environments This meter c...

Page 23: ...Important First make sure that the slide switch actuator MP5 the slide switch S1 and the rotary knob for the 12B and 18 are in the OFF position Place the pca over the four screw posts in the case top...

Page 24: ...Actuator Switch Main PCA Shield Bottom Foot LCD Conn Elastomeric Conn Elastomeric LCD to PCA Support Switch Assembly Battery Shock Absorber Case Bottom Screw THD Form PH P STL 5 14 x 750 as07f eps Fig...

Page 25: ...r Switch Main PCA Shield Bottom Foot LCD Conn Elastomeric LCD to PCA Support Switch Assembly Shock Absorber Battery Case Bottom Screw THD Form PH P STL 5 14 x 750 as10f eps Figure 3 2 Models 7 300 and...

Page 26: ...Maintenance Disassembly and Reassembly 3 3 5 1 2 3 Snap Snap Snaps as04f eps Figure 3 3 Removing and Reinserting the Printed Circuit Assembly S t o c k C h e c k c o m...

Page 27: ...e meter is working properly If the meter fails any of these tests it needs calibration see CALIBRATION or repair The equipment required is specified in Table 3 1 1 Connect the calibrator to the and CO...

Page 28: ...36 05 36 05 103 2 154 6 309 360 5 620 9 10 11 12 13 14 7 300 7 600 7 300 7 600 7 300 7 600 7 300 7 600 7 300 7 600 7 600 40 00V dc 40 00V dc 400 0V dc 400 0V dc 300 0V dc for 7 300 400 0V dc 300 0V d...

Page 29: ...Automatic Selection 1 000 F 1 000 F 2V dc 3 3 43V dc 3 0 5V dc 3 0 0 1 0 350 0 1 0 k 35 k 100 k 2 9 M 35 M 1 96V dc 0 0 F 0 95 F Right Right Right Right Right Right Right Right Right Right Right Right...

Page 30: ...ny input signals to the meter 2 Remove the four screws on the back and separate the case bottom and case top Notice that when you do so the battery remains in the case bottom and power to the meter is...

Page 31: ...put of 3 75V dc 0 25 Within 5 seconds the meter should display a reading between 3 747 and 3 753V dc If it does not adjust R4 as described below To adjust R4 proceed as follows 1 Remove any input sign...

Page 32: ...feat the 50 divider on the calibrator if any 6 Apply an input of 3 500V dc 0 25 Wait at least 3 seconds 7 Apply an input of 3 75V dc 0 25 Wait 5 seconds 8 Adjust R4 so that the meter displays a readin...

Page 33: ...12B 18 7 Series Service Manual 3 12 S t o c k C h e c k c o m...

Page 34: ...icates a device that may be damaged by static discharge How to Obtain Parts Electrical components may be ordered directly from the manufacturer by using the manufacturers part number or from the Fluke...

Page 35: ...CB ASSEMBLY FLUKE 10 18 878991 M A1 PCB ASSEMBLY FLUKE 7 300 614963 M A1 PCB ASSEMBLY FLUKE 7 600 614966 M Newer Instruments Changes and improvements made to the instrument are identified by increment...

Page 36: ...PWB 500 L 867242 1 MP2 CASE TOP PAD XFER WINDOW MODEL 12B 614948 1 MP2 CASE TOP PAD XFER WINDOW MODEL 18 614955 1 MP2 CASE TOP PAD XFER WINDOW MODEL 18 AL 615192 1 MP5 ACTUATOR SWITCH 203445 1 MP6 SU...

Page 37: ...B 18 7 Series Service Manual 4 4 FLUKE 12B FLUKE 18 FLUKE 18 AL T B MP2 S2 MP5 A1 MP9 MP11 U3 J4 J3 MP6 BT1 MP10 MP8 H1 4 as06f eps Figure 4 1 Models 12B and 18 Final Assembly S t o c k C h e c k c o...

Page 38: ...AM THD FORM STL 5 14 750 832246 4 J3 CONN ELASTOMERIC LCD TO PWB 2 050 L 867247 1 MP2 CASE TOP PAD XFER WINDOW MODEL 7 600 614930 1 MP2 CASE TOP PAD XFER WINDOW MODEL 7 300 614922 1 MP5 ACTUATOR SWITC...

Page 39: ...12B 18 7 Series Service Manual 4 6 FLUKE 7 300 FLUKE 7 600 T B MP2 MP5 A1 MP9 MP11 U3 J3 MP6 MP10 BT1 MP8 H1 4 as09f eps Figure 4 2 Models 7 300 and 7 600 Final Assembly S t o c k C h e c k c o m...

Page 40: ...UAL SOT 23 742320 1 1 1 1 E1 SURGE PROTECTOR 3750v 20 867361 1 1 1 1 J1 J2 RECEPTACLE INPUT 878988 2 2 2 2 LS1 AF TRANSD PIEZO 20MM 876995 1 1 1 1 Q1 TRANSISTOR SI NPN SELECT IEBO SOT 23 821637 1 1 1...

Page 41: ...1 1 1 RT1 THERM POS 1 1K 20 25C 867192 1 1 1 1 S1 SWITCH SLIDE 3 POS 5 PIN 868117 1 1 1 1 U1 ARTIC ASSEMBLY TESTED 858472 1 1 1 1 U2 IC CMOS 4 BIT MPU LCD 601575 1 1 0 0 U2 IC CMOS 4 BIT MPU LCD CNTRL...

Page 42: ...Parts and Schematics Parts Lists Drawings and Schematics 4 4 9 FLUKE 12 1601 as11f eps Figure 4 3 Models 12B 18 7 300 and 7 600 Main PCA Components S t o c k C h e c k c o m...

Page 43: ...9 022 TP5 TP4 TP6 TP8 TP7 CW R4 2 5 K Q1 2 0 1 1K RT1 t R2 2 3 0 0 R1 4 1 0 K R1 0 3 0 9 K R2 4 4 8 7 K R1 2 30 1K 4 7 0 R1 9 0 R2 1 R2 9 3 0 0 2 0 5 5 5 5 COMMON M 5 0 V 2 5 1 1 1 1 1 1 1 MF 0 1 4 4...

Page 44: ...7 4 7 5 7 6 7 7 7 8 3 9 4 0 2 6 2 7 2 8 3 3 4 7 4 1 4 3 2 5 6 5 5 5 9 5 8 5 7 5 4 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 11 1 0 9 8 7 6 5 4 3 1 6 4 6 3 6 2 6 1 6 0 5 3 5 2 5 1 5 0 4 9 4 8 4 6 4 5 4 4 4...

Page 45: ...C9 022 TP5 TP4 TP6 TP8 TP7 CW R4 2 5 K Q1 2 0 1 1K RT1 t R2 2 3 0 0 R1 4 1 0 K R1 0 3 0 9 K R2 4 4 8 7 K R1 2 30 1K 5 0 0 R1 9 R2 1 R2 9 3 0 0 2 0 5 COMMON 2 5 M 5 0 V T 1 W M T 2 0 1 0 V DGND DGND W...

Page 46: ...7 3 3 2 8 2 7 2 6 4 0 3 9 7 8 7 7 7 6 7 5 7 4 7 3 7 2 7 1 8 0 7 9 7 0 6 9 6 6 6 5 3 7 3 6 3 5 3 4 3 2 3 1 3 0 2 9 3 8 2 5 6 8 6 7 5 1 0 2 5 V VDD DATA0 DATA1 DATA2 DATA3 CL K BCL K VSS1 W RI TE READ...

Page 47: ...W R4 2 5 K Q1 2 0 1 1K RT1 t R2 2 3 0 0 R1 4 1 0 K R1 0 3 0 9 K R2 4 4 8 7 K R1 2 30 1K 5 0 0 R1 9 0 R2 1 R2 9 3 0 0 5 2 0 COMMON MG 5 3 W T 2 0 1 0 V 1 1 1 1 1 1 1 MF 0 1 4 4 5 2 1 6 0 2 8 3 9 7 6 5...

Page 48: ...2 6 1 6 0 5 3 5 2 5 1 5 0 4 9 4 8 4 6 4 5 4 4 4 2 2 4 2 3 2 2 2 1 1 2 7 2 2 8 3 4 5 6 7 8 9 1 0 11 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 AL 1 0 V 2 0 5 1 2 5 V 1 0 1 5 3 5 2 FLUK...

Page 49: ...P4 TP6 TP8 TP7 CW R4 2 5 K Q1 2 0 1 1K RT1 t R2 2 3 0 0 R1 4 1 0 K R1 0 3 0 9 K R2 4 4 8 7 K R1 2 30 1K 5 0 0 R1 9 0 R2 1 R2 9 3 0 0 5 COMMON 0 2 0 1 0 V 4 7 0 0 PF C5 0 2 0 1 0 V M 5 0 V MG 5 3 W 1 W...

Page 50: ...UND METAL FI LM J CR E L S C REFERENCE DESIGNATION LAST USED NOT USED Q C R U BT S TP Y Z VR RT SEL ECT PI N ASSI GNMENTS MEMBRANE TAIL S2 CLOSED OPEN OPEN CLOSED OPEN OPEN CLOSED CLOSED OPEN LOW Z HI...

Page 51: ...12B 18 7 Series Service Manual 4 18 S t o c k C h e c k c o m...

Page 52: ...Service Centers PN 850941 2 96 S t o c k C h e c k c o m...

Page 53: ...Service Centers cont 2 96 S t o c k C h e c k c o m...

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