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Polar Instruments PFL780 Service Manual

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Polar Instruments Ltd.
Garenne Park
St. Sampson
Guernsey
Channel Islands
http://www.polar.co.uk
Fax: +44 (01) 481 252476
Email: mail@polar.co.uk
MAN 161–9803
PFL780
SERVICE
MANUAL

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Summary of Contents for Polar Instruments PFL780

  • Page 1 PFL780 Polar Instruments Ltd. Garenne Park SERVICE St. Sampson Guernsey MANUAL Channel Islands http://www.polar.co.uk Fax: +44 (01) 481 252476 Email: mail@polar.co.uk MAN 161–9803...
  • Page 2 Copyright Polar Instruments Ltd. 1997 Microsoft and MS-DOS are registered trademarks of Microsoft Corporation IBM is the registered trademark of International Business Machines Corporation.
  • Page 3 PFL780 FAULT LOCATOR SERVICE MANUAL POLAR INSTRUMENTS LTD. HARDWARE WARRANTY Product Warranty. Product hardware is warranted to be free from defects in material and workmanship during the Warranty Period (as defined below). Product hardware is warranted to conform substantially to Polar’s then current (as of the date of Polar’s product shipment) published user documentation during the Warranty Period.
  • Page 5 DECLARATIONS European Community Directive Conformance Statement Refer to the Operator Manual to determine conformance with European Community Directives.
  • Page 6 PFL780 SERVICE MANUAL SAFETY WARNING The service instructions contained in this manual are for use by qualified electronic service personnel only. WARNING The LIVE and NEUTRAL lines on later units are BOTH fused. When the unit is connected to its supply, the opening of covers or removal of panels is likely to expose dangerous voltages.
  • Page 7 The unit is designed for use indoors in an electrical workshop environment at a stable work station comprising a bench or similar work surface. Use only the accessories (e.g. test probes and clips) provided by Polar Instruments. The instrument must be maintained and repaired by a skilled electronics technician in accordance with the manufacturer’s instructions.
  • Page 8 PFL780 SERVICE MANUAL SPECIFICATIONS ASA TEST FACILITIES Test Channels 500µA Test Ranges Junction Logic 150mA 1mA (to S/N 012392) High 1mA (S/N 012393 up) Test Frequencies Low 90Hz 500Hz Medium 2kHz High Pulse Generator DC, Pulse mode 1, 0 – ±5V variable level...
  • Page 9 SPECIFICATIONS ENVIRONMENTAL OPERATING CONDITIONS The instrument is designed for indoor use only under the following environmental conditions: Altitude Up to 2000m Temperature +5°C to +40°C ambient Relative humidity RH 80% maximum at 31°C — derate linearly to 50% at 40°C Mains borne transients As defined by Installation Category II (Overvoltage Category II) in IEC664...
  • Page 10 PFL780 SERVICE MANUAL SYMBOLS REFER TO MANUAL These sockets are for connecting only Polar Instruments probes and connectors for use as described in the Operator Manual. To prevent damage to this product and to ensure its safe use observe the specifications given in this manual when connecting to terminals marked with this symbol.
  • Page 11 PERFORMANCE CHECK........................1-2 Procedure............................1-2 Checking for major faults ....................... 1-2 System diagnostics......................... 1-2 Functional tests ..........................1-2 Testing the PFL780 clips, cables and relays .................. 1-3 SECTION 2 – CALIBRATION........................2-1 CALIBRATION PROCEDURE ....................... 2-1 Equipment required ..........................2-1 Procedure............................2-1 SECTION 3 –...
  • Page 12 PFL780 SERVICE MANUAL INPUT/OUTPUT..........................3-1 I/O ports............................3-1 EAROM ............................3-2 Timer .............................. 3-2 Serial communication ........................3-2 WAVEFORM GENERATION ......................3-2 Waveform generators/buffers ......................3-2 Digital to analog conversion ......................3-2 DRIVE CIRCUITS ..........................3-3 Output amplifiers ..........................3-3 Range select relays ........................
  • Page 13 CONTENTS Changing the Line Voltage ......................... 5-1 Replacing fuses..........................5-2 Line Fuse............................5-2 Input Protection Fuses ........................5-2 SECTION 6 – FAULT DIAGNOSIS ......................6-1 SYSTEM DIAGNOSTICS........................6-1 Instrument diagnostics ........................6-2 Displaying fault codes......................... 6-2 Diagnostic fault codes ........................6-2 SECTION 7 –...
  • Page 15 SECTION 1 – PERFORMANCE CHECK MAINTENANCE AND CALIBRATION OF INSTRUMENTS For most of Polar Instruments’ products there are two maintenance procedures — the Performance Check and the Calibration. Some instruments may have a single (combined) procedure. Performance Check The Performance Check (or Checkout Procedure) is used to verify the basic functions of the instrument.
  • Page 16 Note: Close any active windows to return to the root menu for access to UTILITIES. The PC can now report the status of all the systems within the PFL780 unless there is a failure of the RS232 link, which would be reported should communication not be established.
  • Page 17 Note: a true RMS DVM may give a slightly different reading. Testing the PFL780 clips, cables and relays If it is desired to test clips and cables and the relays of the PFL780 it will be necessary to build a simple test fixture.
  • Page 19 SECTION 2 – CALIBRATION CALIBRATION PROCEDURE WARNING: Hazardous voltages are exposed on the PCB when the cover is removed. This procedure should only be performed by a technically qualified person aware of the hazards and taking all reasonable care. Equipment required Accurate (0.5% or better at 10V DC) DVM Procedure 1.
  • Page 21 Refer to the CPU I/O schematic I/O ports Communication between the CPU and the rest of the PFL780 is by memory mapped ports and a small number of devices connected directly on the data bus. Output ports U1,2,3,4 and U9 provide the route for control signals into the circuits of the main board while U5 and U17 are input ports.
  • Page 22 PFL780 SERVICE MANUAL EAROM U10 is the EAROM which is a serially driven non-volatile device operating much slower than normal bus speed and with all its signal and control lines driven by port U9. The serial output goes to input port U5.
  • Page 23 CIRCUIT DESCRIPTION The differential current out of the DAC is converted to a voltage sine wave of 5V pk-pk symmetrical about ground by op-amps U47A and B. A capacitor filter is included between the two amp stages to smooth any steps from the waveform;...
  • Page 24 PFL780 SERVICE MANUAL INPUT AMPLIFIER Refer to the Input Amplifier schematics Programmable gain amplifier The A and B signal bus connects to the input of the programmable gain signal amplifier U920. Rf for the input op-amp is selected by U57 and Ri is 1M in all except JUNCTION range when relay K9 switches in a 110k resistor in parallel to reduce Ri to 100K.
  • Page 25 CIRCUIT DESCRIPTION operation and +5 V provides an OFF state. The status outputs of U58 on pins 19 and 20 connect to an input port. Analog stores The DAC incorporates a latch and outputs the decoded voltage immediately the new data is written into it by the processor.
  • Page 26 The cooling fan has its own regulated supply, U108. The 5V supply for the logic and processor of the PFL780 is generated by a switch mode regulator U103 from the +15V line. Note that C102 is a high quality low series resistance electrolytic capacitor. The 5V from the switcher supplies only the User output and the digital test circuits directly driving the user’s...
  • Page 27 CIRCUIT DESCRIPTION U3 decodes the high side driver address to take its selected output high. This will turn on one of the open collector devices in the array U1, supplying base current to the driver PNP transistor which will lift its collector to nearly 15V.
  • Page 28 PFL780 SERVICE MANUAL Driver control buffers/latches The data bus from the main board, together with control signals and some address lines connect to the Scanner/ICFT board through the 40-way cable. The data bus is buffered by U54 and U55 but also connects to the 6 input ports from the comparators, one of which is shown.
  • Page 29 CIRCUIT DESCRIPTION Schematic ICT Page 1 covers output drivers DS0 – DS15 (drivers DS16 – DS31, DS32 – DS47 are shown on schematics ICT Page 2 and ICT Page 3). Note that the output DS0 corresponds to pin 1 of a 40 pin IC, up to DS39 which corresponds to pin 40.
  • Page 31 2 minutes after power is removed until internal capacitors discharge. Note: the PFL780 covers are attached to the main body of the instrument by safety ground cables. To disconnect the safety ground cables detach the push-on connector from the tab bolted to the cover.
  • Page 32 PFL780 SERVICE MANUAL CAUTION — Do not try to remove the main board from the chassis until the above procedure is completed. It is very unlikely this would ever be necessary. Re-assembly Re-assembly is the reverse of the above. Ensure the safety ground cables are replaced as the covers are fitted.
  • Page 33 SECTION 5 – LINE VOLTAGE AND FUSE CHANGING WARNING: There are hazardous voltages inside the instrument when connected to its power supply. REMOVE THE POWER CORD before touching any part of the line input circuit. Note that high voltages may continue to be present for 2 minutes after power is removed until internal capacitors discharge.
  • Page 34 PFL780 SERVICE MANUAL Replacing fuses Line Fuse 1. If a line fuse failure is suspected, disconnect the power cord. Early instruments: Locate the line fuse on the rear of the instrument, remove and test. If faulty, dismantle the instrument as described in section 4.
  • Page 35 SECTION 6 – FAULT DIAGNOSIS WARNING: Hazardous voltages are exposed on the PCB when the cover is removed. These procedures should only be performed by a technically qualified person aware of the hazards and taking all reasonable care. SYSTEM DIAGNOSTICS If the “System OK”...
  • Page 36 PFL780 SERVICE MANUAL Instrument diagnostics If the PC cannot be used then it is possible to perform some basic diagnostics on the instrument itself. WARNING: DANGEROUS VOLTAGES EXIST ON THE BOARD. Remove the top cover and turn the power on.
  • Page 37 If it becomes necessary to repair the instrument, in the first instance contact the Polar Instruments distributor in your country. In case of difficulty contact Polar Instruments Ltd. at the address at the front of this manual. Do not send the instrument until shipping instructions have been received from the...
  • Page 39 Note: Parts marked with an asterisk (*) have been subject to modification in later instruments. Safety critical parts (listed in bold type) must be replaced with parts obtained from Polar Instruments Ltd or your Polar Instruments distributor to ensure continued safe operation.
  • Page 40 PFL780 SERVICE MANUAL MAIN BOARD KIT Part Number Description Circuit Reference CEA103 10µF Electrolytic C13, C35, C47, C49, C50, C52, C114, *C911 CEA105 220µF C25, C28, C30, C116, C117, C902, C903 CEA113 22µF C1, C2, C3, C4, C5, C6, C7, C10 CEA118 3.3µF...
  • Page 41 REPLACEMENT PARTS ICA181 MAX232 U6, U7 ICA184 74HC14 U106 ICA186 TL084 U43, U47, U56, U62, U63, U920 ICA189 7705 ICA192 74HC374 U1, U2, U3, U4, U9, U16, U40, U44, U45, U66, U107, U902, U913 ICA227 8253 / 71054 ICA236 ULN2003 ICA240 4053 U51, U909...
  • Page 42 PFL780 SERVICE MANUAL MPCD957 MPP143 Insulator MQX138 28 Pin IC Socket MQX139 40 Pin IC Socket MQX163 Jumper MQX252 1/4 Jack Socket Mono MQX259P3 3 x 1 Pin Header CAL, Ram type MQX260P34 17 x 2 Pin Header *JP2 MQX284...
  • Page 43 REPLACEMENT PARTS RCF4M7 1/4W R128 RCF5K1 1/4W R140, R142 RCF680K 680K 1/4W R203 RCF820R 820R 1/4W R46, R47, R57, R62, R63, R71 RCF82K 1/4W R95, R96 RCT100R 100R 1/4W R48, R81 RCT10K 1/4W R22, R26, R34, R37, R38, R240, R241, R242, R904, R905, *R802, *R803 RCT110K 110K...
  • Page 44 PFL780 SERVICE MANUAL ICTSCN BOARD KIT Part Number Description Circuit Reference CEA105 220uF Electrolytic C2, C4, C90 CEA121 100uF Electrolytic C50, C51, C52, C53, C54, C55 CVD121 330pF Ceramic C8,C9,C10,C11,C12,C13, C14,C15,C16,C17,C18,C19, C20,C21,C22,C23,C26,C27, C28,C29,C30,C31,C32,C33, C34,C35,C36,C37,C38,C39, C40,C41,C56,C57,C58,C59, C60,C61,C62,C63,C64,C65, C66,C67,C68,C69,C70,C71 CVD140 0.1uF Ceramic...
  • Page 45 REPLACEMENT PARTS REL114 Relay 2PCO K1 TO K66, K87, K89, K129, K130 REL115 Relay – Plug-in *K88 (socketed) REL122 Relay K88 (direct PCB-mounted) REL116 Relay Latching K67 to K86, K90 to K93...
  • Page 46 PFL780 SERVICE MANUAL MECHANICAL KIT Part Number Description Circuit Reference FCA126 Fuse 5A T F6 (User 5V) ICA214 LM7812 U108 ICA250 TL783 IND101 *Ferrite Bead IND109 *Ferrite Clamp LDD121 LED115 Red LED MAA129 *Fuseholder, Panel MCA149 Side Moulding MCA165 Enclosure...
  • Page 47 ICT power MSA113 Switch Mode PSU MSH104 M3 Solder Tag MSH105 M4 Solder Tag MWP155 Ground Label MWP156 Serial Number MWPD953 PFL780 Front Label MWPD961 Machined Rear Panel MWPD980 Fuse Label MWPD981 Dissmantling Sheet MWPD1096 Flexishield MWPD1098 Switches Label MWPD1099...
  • Page 49 SECTION 9 – SCHEMATIC DIAGRAMS...
  • Page 50 PFL780 SERVICE MANUAL This page is intentionally blank.
  • Page 51 +15V +15V +15V +15V DS36 DS37 +15V +15V +15V +15V DS38 DS39 +15V +15V +15V +15V B 40WAY ULN2803 ULN2803 Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 Interconnect B 26 WAY A 26 WAY...
  • Page 52 DS10 74HC373A 74HC373A 74HC373A 74HC373A DS6ENA/ 3.4UH DS10ENA/ DS14ENA/ 4.3uH 4.3uH 4.3uH DS3ENA/ DS15 74HC373A 74HC373A 4.3uH 74HC373A 4.3uH 74HC373A DS7ENA/ DS11 DS11ENA/ DS15ENA/ Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 ICT Page 1...
  • Page 53 74HC373A DS22ENA/ 4.3uH DS26ENA/ DS22 DS30ENA/ 4.3uH 4.3uH 4.3uH DS18 4.3uH DS19ENA/ DS31 74HC373A 74HC373A 74HC373A 4.3uH 74HC373A DS23ENA/ DS27 DS19 DS23 DS27ENA/ DS31ENA/ Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title ICT Page 2 PFL780...
  • Page 54 DS38ENA/ 4.3uH DS38 DS42ENA/ DS46ENA/ 4.3uH DS34 4.3uH L47 4.3uH 4.3uH DS35ENA/ DS47 74HC373A 74HC373A 74HC373A 4.3uH 74HC373A DS39ENA/ DS43 DS35 DS39 DS43ENA/ DS47ENA/ Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 ICT Page 3...
  • Page 55 DS40ENA/ 74AC74 74AC00 DS41ENA/ DB10 DS42ENA/ DB11 DS43ENA/ DB12 R130 DS44ENA/ DB13 DS45ENA/ DB14 DS46ENA/ DB15 330R 74AC244 DS47ENA/ 74HC374 74HC373 Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 ICT Page 4 S/No 11378 up...
  • Page 56 74AC74 74AC00 DS41ENA/ DB10 DS42ENA/ DB11 DS43ENA/ DB12 R130 DS44ENA/ DB13 DS45ENA/ DB14 DS46ENA/ DB15 330R 74AC244 DS47ENA/ 74HC374 74HC373 Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 ICT Page 4 up to S/No 11377...
  • Page 57 DBC7 BANK3/ 74AC374 DB[0..15] U58B DBC8 DBC9 DB10 DBC10 DB11 DBC11 U59D DB12 DBC12 U59C DB13 DBC13 DB14 DBC14 DB15 DBC15 74HC74 74HC00 74HC00 74AC374 Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 ICT Page5...
  • Page 58 150R 150R .1UF .1UF 330pf 330pf 150R 150R 330pf 330pf 150R 150R 330pf 330pf 150R 150R 330pf 330pf 150R 150R 330pf 330pf 150R 150R Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title ICT Page 6 PFL780...
  • Page 59 150R 150R .1UF .1UF 330pf 330pf 150R 150R 330pf 330pf 150R 150R 330pf 330pf 150R 150R 330pf 330pf 150R 150R 330pf 330pf 150R 150R Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 ICT Page 7...
  • Page 60 330pf R103 330pf 150R 150R 330pf 330pf R112 150R R104 150R VADJ 68uF 68uF 68uF 68uF 68uF 68uF .1UF .1UF .1UF .1UF .1UF .1UF Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 ICT Page 8...
  • Page 61 D188 D202 D204 D206 D186 D190 D192 D208 D218 D220 D222 D224 D185 D187 D189 D191 D201 D203 D205 D207 D217 D219 D221 D223 Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 ICT Page 9...
  • Page 62 ULN2803 ULN2803 ULN2803 ULN2803 +15V ROW1 ULN2803 ROW2 ULN2803 ROW3 SLSA0 ULN2803 SLSA1 SLSA2 ROW4 ULN2803 ROW5 ULN2803 74HC238 ROW6 ULN2803 ROW7 ULN2803 ROW8 ULN2803 Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title Relay Drivers PFL780...
  • Page 63 D107 ROW5 D112 D109 D111 D110 D113 ROW6 D127 D122 D120 D118 D116 D114 D125 ROW7 D124 D117 D119 D128 D126 D123 D115 D121 ROW8 Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 Scanner Relays...
  • Page 64 Plane Short 1A Thermal 220uF BA[0..15] BA[0..15] 5V i/p BA[0..15] BA[0..15] BA[0..15] PORTRD3 PORTWR0 12V i/p PORTWR1 LM7805 PORTWR2 \IORQ 1N4007 220uF 74HC138 0.1uF 74HC138 Guard Hi PORTRD6 PORTWR7 PORTRD4 T-Series and Toneohm Fault Finding Schematic 1 15-Feb-95 Polar Instruments...
  • Page 65 PORT 0007 I/P Leakage On a bus U16B 74HC373 Guard Hi 74HC32 74HC75 U22A 74HC04 PORTWR2 0.01uF 74HC374 PORTWR7 SW12 T-Series and Toneohm 220uF 100K LM386 SPEAKER Fault Finding 220uF Schematic 2 15-Feb-95 Hairline Short Large Land Bridge Polar Instruments...
  • Page 66 +15V U63C R242 C116 -15V 220uF 10K 1% TL084 R236 THRESH2 U922 R250 LM759 C118 10K 0.1% 0.1uF C117 R249 R251 -15V 220uF Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 A to D Converter...
  • Page 67 0.1uF U31B 74HC74 74AC32 U14D U31A 74AC32 R-IN U31D 74AC32 RESET RESET 74AC32 U33F NOT FITTED 7705 .1uF 10uF 74HC04 62256 74HC74 U30B Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 CPU S/No 11378 up...
  • Page 68 0.1uF U31B 74HC74 74AC32 U14D U31A 74AC32 RESET R-IN U31D NOT FITTED 74AC32 74AC32 RESET U33F 7705 .1uF 10uF 74HC04 62256 WATCHDOG Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 CPU up to S/No 11377...
  • Page 69 270R OUT0 SENS2 270R SENS3 270R CLK1 270R TOUT2 270R OUT1 LAMP CLK2 OUT2 AUX_IN WATCHDOG 74HC374 25 PIN "D" 74HC373 TIMER INPT INPT 8253 Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 CPU I/O...
  • Page 70 22R 1W 22R 1W B LO 12V 5W LM759 16K 1% 220uF B JUNC 820R 12V 5W R85 20K 1% .22uF 2K2 1% Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 Drive Amplifiers S/No 12393 up...
  • Page 71 22R 1W 22R 1W B LO 12V 5W LM759 16K 1% 220uF B JUNC 820R R85 20K 1% 12V 5W .22uF 2K2 1% Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 Drive Amplifiers to S/No 12392...
  • Page 72 1N4148 +UREG R924 270R ISO1A CNY74 R922 D910 270R 1N4148 U925B 74HC74 R921 270R D913 R920 1N4148 10uF 270R D911 C911 1N4148 10uF Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 Footswitch S/No 12393 up...
  • Page 73 1M 1% TL084 270pF 100K R105 U106E 47K 1% R106 REF2 47K 1% 2N3904 IP GAIN 3 74HC14 Q20base U55B C115 ULN2003 0.1uF Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 Input Amplifier S/No 12393 up...
  • Page 74 TL084 100K ISO1 270pF R105 U106E 47K 1% R106 REF2 47K 1% IP GAIN 3 74HC14 2N3904 U55B C115 ULN2003 0.1uF R205 Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 Input Amplifier to S/No 12392...
  • Page 75 SENS UPWR SCAN_B SCAN_A SLSA0 SLSA1 SLSA2 SHSA0 SHSA1 SHSA2 SENSV +15V A RELAYS B RELAYS 74HC374 D[0..15] DUMP U67A Polar Intruments Ltd Garenne Park, St. Sampsons SCANNER SENS1 Guernsey, Channel Islands SENS2 74AC32 Inst. SENS3 Title PFL780 INTERFACE SCANNER...
  • Page 76 68K 1% 68K 1% D55 1N4007 R144 78L05 +15V R140 10uF .1uF 0.1uF 10uF 79L05 -15V R141 R142 10uF .1uF 0.1uF 10uF Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 Power Supply to S/No 11377...
  • Page 77 115V D55 1N4007 Line Select R144 78L05 +15V R140 10uF .1uF 0.1uF 10uF 79L05 -15V R141 R142 10uF .1uF 0.1uF 10uF Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 Power Supply S/No 11378 to 12392...
  • Page 78 68K 1% 115V into transformer D55 1N4007 0.1uF 10uF Line Select 78L05 -15V R141 R142 10uF .1uF 0.1uF 10uF 79L05 Polar Intruments Ltd 10uF Garenne Park, St. Sampsons .1uF Guernsey, Channel Islands Inst. Title PFL780 Power Supply S/No 12393 up...
  • Page 79 R908 R909 R902 PULSE_4 R905 47K 1% 10K 1% C110 0.1uF D901 C904 C903 .1uF 4053 220uF R903 47K 1% 74HC374 U54H D[0..15] D[0..15] ULN2803 D[0..15] Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 Pulser...
  • Page 80 U47B REF2 4K99 1% 1MHz TL084 10V REF 1MHz REF2 ADJ 10K 1% U33A LOAD 27512 2KHz 74HC161 74HC374 74HC04 4040 2MHz 2MHz U33C 74HC04 Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 Sine Generator...
  • Page 81 74AC374 DRIVE DATA LATCHES ENABLE ASYNCH LATCH BANKS ADDRESS DECODE DRIVER DATA BANKS ICTI/F INPUT BANKS LM339 330pF STROBES 150R THRESHOLD 1 74HC244 74HC244 Polar Intruments Ltd Garenne Park, St. Sampsons Guernsey, Channel Islands Inst. Title PFL780 ICFT Concept Diagram...