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THIS SERVICE MANUAL REPLACES: the first edition Service Manual 4822 872 35302 the second edition Service Manual 4822 872 35312 -Service note SME 126, 4822 872 38308 -Service note SME 130, 4822 872 38313 -Service note SME 132, 4822 872 38315 CONTENTS III 1. SAFETY INSTRUCTIONS 1-1 2. CHARACTERISTICS AND PERFORMANCE TEST 2-1 3. CIRCUIT DESCRIPTION 3-1 3.1 Explanation of the block diagram ... 3-1 3.2 Detailed description ... 3-6 3.3 Analog section ... 3-6 3.3.1 V dc measurement ... 3-7 3.3.2 V ac measurement ... 3-9 3.3.3 DC/AC current measurements ... 3-11 3.3.4 Resistance measurement ... 3-11 3.3.5 Temperature measurement ... 3-12 3.3.6 Multiplexer ... 3-12 3.3.7 Control of analog section ... 3-12 3.3.8 Guard circuit ... 3-12 3.3.9 Analog to Digital conversion ... 3-13 3.3.9.1 General ... 3-13 3.3.9.2 ADC principle ... 3-13 3.3.9.3 Automatic zero ... 3-14 3.3.9.4 DAC ... 3-14 3.3.10 Reference voltages ... 3-14 3.3.11 Inguard-outguard connection ... 3-15 3.4 Digital section ... 3-15 3.4.1 Software description ... 3-15 3.4.2 RAM/ROM ... 3-16 3.4.3 I2C bus ... 3-16 3.5 IEEE/IEC Interface ... 3-17 3.5.1 Receiving ... 3-17 3.5.2 Transmitting ... 3-17 3.6 Display/keyboard ... 3-18 3.7 Data of components ... 3-18 3.7.1 8031 AH microcomputer ... 3-18 3.7.2 MAF 8441 ... 3-22 3.7.3 DAC 08 E ... 3-24 3.7.4 TL 7705A ... 3-25 3.7.5 OM 503 ... 3-26 3.7.6 SA 1045 ... 3-27 3.7.7 OQ 0300 ... 3-28 3.7.8 OQ 0301 ... 3-29 3.7.9 SA 1300 ... 3-31 3.7.10 PCF 8574 ... 3-31 3.7.11 OQ 0068 ... 3-33 3.7.12 LTC 1052 ... 3-34 4. DISMANTLING THE INSTRUMENT 4-1 4.1 Removing the cover ... 4-1 4.2 Removing the top screening ... 4-2 4.3 Removing the bottom screening ... 4-2 4.4 Removing the front assembly ... 4-2 5. CHECKING AND ADJUSTING 5-1 5.1 General information ... 5-1 5.2 Calibration adjustments ... 5-1 5.3 Adjusting the PM2534.PM2535 using a controller ... 5-4 6. CORRECTIVE MAINTENANCE 6-1 6.1 Special parts ... 6-1 6.2 Replacing parts ... 6-2 6.2.1 Parts on the PCB ... 6-2 6.2.2 LX-display, window and interconnection rubber ... 6-2 6.2.3 Input unit ... 6-3 6.2.4 Interchanging input unit ... 6-4 6.2.5 Fuses ... 6-4 6.3 Trouble shooting ... 6-5 7. SAFETY INSPECTION AND TESTS AFTER REPAIR AND MAINTENANCE IN THE PRIMARY CIRCUIT 7-1 7.1 General directives ... 7-1 7.2 Safety components ... 7-1 7.3 Checking the protective earth connection ... 7-1 7.4 Adaption to the local mains ... 7-2 7.5 Adaption to the local mains frequency ... 7-2 8. PARTS LIST 8-1 8.1 Mechanical parts ... 8-1 8.2 Electrical parts ... 8-3 9. CIRCUIT DIAGRAMS AND PRINTED CIRCUIT BOARDS LAY-OUTS 9-1 10. GLOSSARY OF TERMS 10-1 11. MODIFICATIONS 11.1 Hardware modifications ... 11-1 11.2 Software modifications ... 11-7

1. INTRODUCTION 1-1E 2. SPECIFICATION OF THE RS232-C/V24 Interface 2-1E 2.1 SPECIFICATION ... 2-1E 2.2 SWITCH SETTINGS ... 2-1E 2.2.1 Baudrate ... 2-1E 2.2.2 Character length, parity, handshake ... 2-1E 2.2.3 Multidrop mode ... 2-2E 2.3 CONNECTOR PINNING ... 2-4E 2.4 CABLE FOR CONNECTION BETWEEN THE P3200/IBM AT AND THE PM9190 ... 2-4E 2.5 CABLE FOR CONNECTION BETWEEN THE PM3102/IBM XT AND THE PM9190 ... 2-4E 3. PROGRAMMING THE PM2534 AND PM2535 3-1E 3.1. Interface MESSAGES ... 3-1E 3.1.1 Remote/local functions ... 3-1E 3.1.2 Device clear ... 3-1E 3.2 Interface PROGRAMMING ... 3-1E 3.2.1 Separators ... 3-2E 3.2.2 Identity ... 3-2E 3.2.3 Interface test ... 3-2E 3.3 DEVICE PROGRAMMING ... 3-2E 3.4 OUTPUT DATA ... 3-2E 3.4.1 General rules ... 3-2E 3.4.2 Measuring data ... 3-3E 3.4.3 Device status data ... 3-3E