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MONITOR DESCRIPTION

MONITOR DESCRIPTION

The Model 101R/NR Portable Patient Monitor is a dual trace monitor for ECG and heart rate, which produces an
output pulse corresponding in time to the R-wave. The monitor is intended primarily for use in timed imaging
studies, TMR/PMR and any application requiring precision R-wave synchronization.

Specifications

ECG

Lead

Selection:

LI,

LII, LIII menu selectable.

Patient Cable:

6-Pin AAMI Standard connector

Isolation:

Isolated from ground related circuits by >4 kV rms, 5.5 kV peak

CMRR:

≥

90 dB with patient cable and 51 k

Ω

/47 nF imbalance

Input

Impedance:

≥

20 M

Ω

at 10 Hz with patient cable

Frequency

Response

CRT:

Filtered:

0.5

to

25

Hz

Unfiltered:

0.5

to

45

Hz

Frequency

Response

X1000 output:

Filtered:

0.5 to 25 Hz

Unfiltered:

0.2

to

100

Hz

Input Bias Current:

Any lead configuration <200 nA dc maximum

Electrode

Offset

Potential:

±

0.5 V DC

Noise:

<20

µ

V peak-to-peak, referred to the input with all leads connected

through

51

k

Ω

/47 nF to ground

Defibrillator

Protection:

Protected against 360 J discharge and electrosurgery potentials

Leakage

Current:

<10

µ

A at normal condition

Electrosurgical

Interference

Protection:

Standard

Notch

Filter:

50/60

Hz

(automatic).

Model 101R/NR Service Manual

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Summary of Contents for 101NR

Page 1: ...Service Manual Model 101R NR Patient Monitor R wave Trigger 2409 00 20 ...

Page 2: ...right 1999 by Ivy Biomedical Systems Inc Branford Connecticut All rights reserved No part of this manual may be reproduced without the permission of Ivy Biomedical Systems Inc 101R NR0999 2409 00 20 REV 00 ...

Page 3: ...ndicatiors 7 Basic Keys 7 Programmable Keys 8 Menu Structure 9 Display 10 Rear Panel 10 MONITOR SETUP 12 Change Mains Voltage 12 TRIGGER OUTPUT 13 The Trigger Pulse 13 Trigger Spot Display 13 ECG MONITORING 14 Safety Considerations 14 Patient Connections 15 ECG Waveform Amplitude Size 15 Lead Selection 16 ECG Filter 16 Alarm Limits 17 RECORDER OPERATION 18 Changing Paper 18 Recorder Menus 19 Recor...

Page 4: ...t 28 Cathode Generation Circuit 28 Low Voltage Power Supplies 29 DC Voltages 29 Isolated DC Voltages 29 ECG Input 29 Isolated Amplifiers 29 Lead Off Sensor 29 Shield Drive 29 Lead Selection 29 Test Signal Generation 30 ECG Waveform 30 ECF Filter 30 X1000 Output 30 ECG Gain 30 A D Converter 30 Cardiotach 31 Peak Detector 31 Rate Computation 32 Alarm Generation 32 CRT Signals 32 Vertical Deflection ...

Page 5: ...Procedure 43 Equipment Required 43 ECG Signal 43 50 60 Hz Notch Filter 43 Peak Detector 43 CRT Display 44 ASSEMBLY AND DISASSEMBLY 46 Removing Cover 46 Removing the High Voltage Power Supply 46 Removing the Yoke 47 Removing the CRT 47 Replacing the Main Power LED 47 Removing the Recorder Assembly 47 Removing the Mother Board 48 Replacing the Touch Panel 48 PURCHASING INFORMATION 49 Part List 49 Te...

Page 6: ...riginal shipment If an examination discloses such products or component parts to have been defective then our obligation is limited to repair or replacement at our option Fuses and batteries are not covered under this warranty During the first year of service there is no charge for parts or labor In the second year of service the customer is charged for labor only iv Model 101R NR Service Manual ...

Page 7: ...adjustments or repairs are carried out by persons authorized by the manufacturer the electrical installation complies with all applicable regulations the equipment is used in accordance with the instructions in this manual Incorrect operation or failure of the user to maintain the monitor in accordance with proper maintenance procedures relieves the manufacturer or his agent from all responsibilit...

Page 8: ...tached to other devices insure that the total chassis leakage currents of all units do not exceed 300µA Explosion DANGER Explosion hazard Do not use this equipment in the presence of flammable anesthetics Patient Connections Patient connections are electrically isolated Type CF For all connections use insulated probes Don t let patient connections contact other conductive parts including earth See...

Page 9: ...is used in conformance with the manufacturer s instructions EMC This equipment has been certified to be protected to emissions and immunity according to IEC 601 1 2 Description of Warning Labels Attention consult ACCOMPANYING DOCUMENTS before attempting to change power supply selection or carry out interconnections Equipment connected should comply with IEC 601 1 or IEC 950 with configuration to I...

Page 10: ...5 kV peak CMRR 90 dB with patient cable and 51 kΩ 47 nF imbalance Input Impedance 20 MΩ at 10 Hz with patient cable Frequency Response CRT Filtered 0 5 to 25 Hz Unfiltered 0 5 to 45 Hz Frequency Response X1000 output Filtered 0 5 to 25 Hz Unfiltered 0 2 to 100 Hz Input Bias Current Any lead configuration 200 nA dc maximum Electrode Offset Potential 0 5 V DC Noise 20 µV peak to peak referred to the...

Page 11: ...o 100 bpm in 5 bpm increments Asystole R to R interval 6 seconds Lead Off Detached lead or offset potential 0 5 V Test Mode ECG 1 mV 100 ms 70 bpm Display Type CRT P31 phosphor non fade Trace Dual Fixed moving bar single trace normal operation Dual trace in freeze mode Screen Size 14 25 cm by 10 2 cm 17 5 cm diagonal Sweep Speed 25 50 mm s Mechanical Size Height 6 25 in 16 cm Width 12 5 in 31 cm D...

Page 12: ...tal Operating Temperature Range 5 C to 45 C Storage Temperature Range 25 C to 60 C Relative Humidity 0 90 non condensing Power Requirements Voltage Input 100 120 220 230 V 50 60 Hz 10 15 to change mains operating voltage see text on Monitor Setup Maximum ac Power Consumption 85 VA Safety Unit meets or exceeds the specifications for the AAMI Cardiac Monitor Standard Units meet UL544 CSA and CE MDD ...

Page 13: ...r perform procedures that would otherwise set off the alarms This avoids the problem of turning off the alarms and forgetting to turn them back on Press this key again to return the alarms to normal before the two minutes have expired Generates a 1 mV pulse at 70 bpm that is displayed on the ECG trace and sent to the X1000 output on the rear panel while the switch is depressed This is used to ensu...

Page 14: ...ey once Return to normal function by pressing MENU key again Selects the speed at which the ECG trace moves across the screen Stops the movement of the ECG waveform on the display for closer evaluation and displays the waveform as a second trace below the actual trace Press FREEZE again to resume movement Resets the audible and visual indicators for an alarm that has been activated Enables the Tri...

Page 15: ...MONITOR DESCRIPTION MENU STRUCTURE HIGH LOW TRIG DELAY 101R Model 101R NR Service Manual 9 ...

Page 16: ...ER INPUT A receptacle for a standard ac power cord When the monitor is connected to another piece of equipment through this rear panel connector always make sure that each piece of connected equipment has its own separate ground connection Do not attempt to connect cables to these connectors without contacting your Biomedical Engineering Department This is to ensure the connection complies with le...

Page 17: ...OLUME MAX OFF MIN REFERS TO OPERATOR S MANUAL X 1000 ECG 85VA 50 60Hz 120 Vac QRS Volume Control ECG Output stereo jack Tip ECG X1000 PEQ Ground Voltage Selection wheel Fuse Beneath Panel Power Input Trigger Output BNC Selects Output Trigger Polarity Fuse rating 100V 120V 220V 230V T 1 6 Amp T 1 0 Amp 250V 250V 5mm x 20mm 5 mm x 20 mm Model 101R NR Service Manual 11 ...

Page 18: ...de of the front panel to turn power on 3 Connect the patient cable to the ECG connector on the front panel 4 Connect the Trigger Output from the monitor rear panel to the device being triggered To change Mains Voltage 1 Locate power entry module in Rear Panel 2 Remove line cord 3 Pry down entry cover 4 Locate and remove voltage wheel and set for appropriate voltage 5 Replace fuse with proper size ...

Page 19: ...gger pulse compared to the ECG waveform Trigger Spot Display Press the TRIG MARK key on the front panel to highlight the portion of the ECG waveform corresponding to the timing of the trigger pulse Press TRIG MARK again to disable Trigger Spot Optional Trigger Delay Trigger delay is user adjustable by using the Trigger Delay menu Range is from 0 to 700 ms in 5 ms increments Intensity modulation hi...

Page 20: ...rts including earth See instructions for patient connections in this manual Leakage current is limited internally by this monitor to less than 10 µA However always consider additional leakage current that can be caused by other equipment used on the patient at the same time as this monitor Avoid electrosurgery burns at monitoring sites by ensuring proper connection of the electrosurgery return cir...

Page 21: ...nect the patient cable to the monitor s front panel ECG input 3 Attach the leads to the electrodes 4 Use the procedures described in the following sections for alarm limit settings lead selection amplitude adjustment and enabling or disabling the filter ECG Waveform Amplitude Size Use the following procedure to adjust the amplitude size of the displayed ECG waveform 1 Press the MENU key once The f...

Page 22: ...he current lead selection is shown below the alarm limits in the upper right portion of the display Available lead selections are Lead I Lead II or Lead III ECG Filter Select FILTER to turn the filter on or off The filter on off indication is shown in the upper right portion of the display The filter sets the frequency response of the displayed waveform as follows Filtered 0 5 to 25 Hz Unfiltered ...

Page 23: ...se the four programmable keys to the right of the display to set the high and low heart rate limits Increases high HR limit Ø Decreases high HR limit Increases low HR limit Ø Decreases low HR limit Each time you press a key the corresponding limit changes by 5 bpm The current limits are always shown in the upper left portion of the display Model 101R NR Service Manual 17 ...

Page 24: ... the door does not open completely pull it toward you until it is completely open 2 Reach in and remove the spent paper core by pulling it gently toward you 3 Place a new paper roll between the two round tabs of the paper holder 4 Pull some paper from the roll Make sure the sensitive shiny side of the paper faces the print head The shiny side of the paper normally faces inside the roll 5 Align the...

Page 25: ...at starting at step 5 Recorder Menus The recorder user interface is through the menu structure of the 101R NR 1 Press the MENU key to display the main menu 2 Select RECORDER to display the recorder menu NOTE At the start of each printout the printer produces a header consisting of the current readings for all parameters in use at the time of the printout whether the parameter is displayed or not ...

Page 26: ...Y RECORDER 2 Press the programmable key TRIG MARK once to select RECORDER RECORDER SET CLOCK 3 Press the programmable key SPEED 25 50 to select printing mode Direct To print in direct press the PRINT key Press PRINT again to stop printing The plot is preceded by a header which contains all parameter readings and the time date The speed of the plot and vertical resolution are the same as the displa...

Page 27: ...ner of the display 1 Press the MENU key once The main menu appears 2 Press the programmable key TRIG MARK once to select RECORDER 3 Press the programmable key TRIG MARK once to select SET CLOCK N E X T 11 20 AM 25 SEPT 98 Ø ENTER 4 Press the programmable key SPEED 25 50mm s to place the flashing cursor under the hour minutes date month or year 5 Press the programmable key FREEZE to increase what t...

Page 28: ...ve been turned off LEAD OFF A lead has been disconnected or the electrode offset potential has exceeded 0 5 V This alarm cannot be reset with the ALERT RESET key HR HIGH The high heart rate alarm limit has been exceeded for four seconds HR LOW The low heart rate alarm limit has been exceeded for four seconds ASYSTOLE The interval between heartbeats has exceeded six seconds 22 Model 101R NR Service...

Page 29: ... connector If these indications are not present contact qualified service personnel Under normal operation no internal adjustment or recalibration is required Safety tests and internal adjustments should be done by qualified personnel only Safety checks should be performed at regular intervals or in accordance with local or governmental regulations In the event that internal adjustment or recalibr...

Page 30: ...es of the monitor with a cloth or swab dampened with a warm water and mild detergent solution Do not allow liquids to enter the interior of the instrument Patient Cables Do not autoclave the patient cables Wipe the cables using soap and water or alcohol Never submerge the cables in any liquid or allow liquids to enter the electrical connections 24 Model 101R NR Service Manual ...

Page 31: ...590170 Patient Leads 590162 BNC Interconnect Cable Assembly 1564 01 10 8 ft long Box of 10 rolls of recorder paper 590035 101R Disposal Disposal of devices or consumables must be done in accordance to natural environmental laws Model 101R NR Service Manual 25 ...

Page 32: ...t They are also used as intensity control Another way of changing the apparent intensity of the beam is to change the voltage at the cathode or to quickly switch the cathode on and off Turning the crt beam on and off is often referred to as z axis control This causes the beam to appear and disappear The phosphor holds some of the light from the beam while it is off making it appear that the beam i...

Page 33: ... The Timer Circuit inverts the VERT SYNC signal with a transistor and runs it to a monostable multivibrator one shot timer The one shot changes the duty cycle of the inverted waveform from 44 to between 12 and 60 varied by adjusting the EFF potentiometer The ability to change the duration of this signal allows the operation of the high voltage module to be fine tuned A small duty cycle means less ...

Page 34: ...f between waveform strokes or during a retrace The beam of the crt should be off when this signal is high TREND INT is an analog signal used to make the waveform traces brighter or darker in relation to the raster written data on the crt The CATHODE Z IN signal enters the cathode generation circuit at the input of the Z buffer The Z buffer contains an inverting buffer and transistor The inverting ...

Page 35: ... LL LA RA are applied to overvoltage protection devices and to input amplifiers U54 A B C The signals are then routed to lead selector switch U45 The selected signal is amplified by U46 and driven by optical couplers U42 and U43 which pass the signal to the non isolated portion of the circuit Lead Off Sensor If any of the leads are disconnected a large offset on the input signal is detected by U47...

Page 36: ...matically switches in the correct notch filter X1000 Output The output at U26 Pin 1 is the X1000 signal that is sent to the rear panel for use with a recorder or other equipment ECG Gain The signal from U24 Pin 1 goes to ECG gain amplifier U24 Pin 7 The gain of this circuit is determined by resistors switched into the circuit by U25 This switch is controlled by signals G1 G2 and G3 from the digita...

Page 37: ...in 7 goes high The time between when the signal exceeds the threshold and when the peak occurs must be between 7 and 70 ms for the pulse to be accepted The 7 and 70 ms timing pulses are generated by one shots U30 If the signal is accepted the CPU generates a 10 ms EVENT pulse The leading edge of the EVENT pulse occurs at the peak of the R wave This signal goes to the digital circuitry for heart ra...

Page 38: ...raster display period the vertical deflection is the vertical ramp generated by U8B with its timing set by the V SYNC signal The vertical ramp is passed through Q15 to the vertical deflection amplifiers Horizontal Deflection The horizontal ramps are generated by U16 and U17 with timing controlled by the H SYNC signal Four ramps are generated in each timing cycle The two small ramps are for raster ...

Page 39: ...ECG waveform Audio Circuits Two types of audio is produced by the monitor a QRS beep and an alarm tone The QRS beep is a short tone that is generated each time a QRS complex is detected by the monitor The alarm tone is produced when any of the alarms are triggered The alarm tone can be disabled by pressing the front panel ON OFF button ECG Audio The audio signal originates in the digital circuitry...

Page 40: ...m access memory RAM This memory is for temporary storage of data that the microprocessor must store U36 generate timing signals for the system For the stroke display the microprocessor sends the digital ECG waveform through FIFOs U27 and U28 to D A converter U29 to generate the D A signal that gets switched into the vertical deflection signal during ECG waveform display For raster display the micr...

Page 41: ...r to the monitor and set the simulator as follows Heart rate of 70 bpm Amplitude of 1 0 mV 2 Observe the following on the monitor display ECG Lead I is displayed and is noise free Heart rate of 70 1 bpm The heart next to the heart rate indicator flashes with every QRS complex displayed 3 Verify that ECG Leads I II and III display properly 4 Change the heart rate on the simulator to 40 bpm Notice t...

Page 42: ... to make the trace move again 8 Press SPEED The trace speeds up to twice its previous speed 9 Press SPEED to slow the trace down again 10 Press ON OFF The ALARMS OFF message goes off 11 Adjust the high heart rate limit to 100 bpm 12 Set the simulator heart rate to 120 bpm The HR HIGH message is displayed and an audible alarm sounds 36 Model 101R NR Service Manual ...

Page 43: ... the fuses on the low voltage side inside the monitor CRT Display The display is generated from signals developed on the Mother Board The crt gets its high voltage and cathode signal from the High Voltage Power Supply board If there is no picture at all the problem is most likely the crt itself or the HVPS board See the Key Signals section to check these components If there is a display but either...

Page 44: ...RT Bad Horizontal or Vertical 1 Mother Board Test OK 1 Patient Cable 2 Connector Front Panel to Mother Board 3 Input Amplifiers on Mother Board ECG Test Not OK 1 Mother Board No Audio At All 1 Mother Board 2 Connection to Speaker 3 Speaker No Alarm Audio 1 Alarm On Off Setting 2 Mother Board Audio No ECG Audio 1 Rear Panel switch setting 2 Mother Board 38 Model 101R NR Service Manual ...

Page 45: ...SUPPLY AND VIDEO CRT AMPLIFIER CPU AND DIGITAL CIRCUITS D A CONVERTOR U29 MULTIPLEXER VERTICAL Q15 Q16 DEFLECTION U6 RASTER GENERATOR U8B A D CONVERTOR U21 TRIGGER PEAK CIRCUITRY TRIGGER DETECTOR U18A U12 OUTPUT U23B ISOLATED TEST CIRCUIT U44 PROTECTION LEAD NOTCH CIRCUITS SELECT FILTER U45 U26C ECG INPUT SHIELD DRIVE ECG X1000 BUFFER MOTHER BOARD Model 101R NR Service Manual 39 ...

Page 46: ...ltages 20 V Measure at fuse F3 Normal 14 5 to 20 V 20 V Measure at fuse F2 Normal 14 5 to 20 V 8 V Measure at fuse F1 Normal 6 5 to 8 5 V Regulated Voltages 12 V Measure at 12 TP Normal 11 6 0 7 V 12 V Measure at 12 TP Normal 11 6 0 7 V 12 X Measure at 12X TP Normal 12 0 5 V 5 V Measure at 5 TP Normal 5 V 100 mV 8 V Measure at 8 TP Normal 8 V 10 mV 8 V Measure at 8 TP Normal 8 V 100 mV 7 V Measure...

Page 47: ...pear on the monitor s display The rate indication on the display should be 70 bpm This verifies the operation of the ECG circuitry from very near the front of the monitor s ECG section To verify the remaining circuit use a simulator at the ECG input to generate a 1 mV ECG signal CRT Display The following are signals generated by the Mother Board for creating the display If these signals are correc...

Page 48: ...alarm indication To verify operation of the High Voltage Power Supply board check the dc voltages as indicated in the Voltage Measurements section High Voltage Power Supply Also check the following dc filament voltages at the crt socket harness 5 V brown Normal 4 9 to 5 1 V 7 V black Normal 6 8 to 7 1 V 42 Model 101R NR Service Manual ...

Page 49: ...itor s front panel controls set the filter to ON and the lead selection to Lead I 2 Insert a 10 mV p p 50 or 60 Hz sinusoidal signal into the monitor s front panel ECG input See the diagram below for a suggested input circuit 3 With an oscilloscope look at the signal at the NOTCH test point on the Mother Board 4 Adjust RV13 for 60 Hz and RV14 for 50 Hz for minimum amplitude signal at the NOTCH tes...

Page 50: ...e so that the trend line on the display is horizontal 3 Tighten the yoke clamp screw Horizontal Adjustments 1 Put the oscilloscope on U16 Pin 1 There should be two large ramps and two small ramps 2 Adjust RV15 so that the peak of the large ramp is 3 4 V 3 Adjust RV5 so that the trend line ECG waveform line is 132 mm long 4 Adjust RV16 SS ADJ so that the ALARMS OFF display area is 33 mm across 5 Pr...

Page 51: ...st the Focus and Intensity adjustments near the top of the High Voltage Power Supply board for the desired display 2 Adjust the Trend Intensity adjustment on the HVPS board to set the trend line intensity separately Isolation and Leakage Tests Use a leakage tester or use the ac voltage range on a digital voltmeter to measure across a 1 kΩ resistor in parallel with a 0 15 µF capacitor and 10 Ω resi...

Page 52: ...connect the power cord from the ac outlet 2 Remove the two screws in the rear that attach the top cover to the rear panel 3 Slide the cover back and lift it off 4 To remove the bottom cover turn the monitor upside down and use the same procedure Removing the High Voltage Power Supply 1 Remove the top cover as described above The High Voltage Power Supply board is mounted vertically near the front ...

Page 53: ...bracket on the center side of the crt 4 Tilt the crt toward the side of the monitor and guide it out of the unit 5 After replacing the crt do the CRT Display adjustments described in the Testing and Troubleshooting section of this manual Replacing the Main Power LED 1 Remove the top cover the High Voltage Power Supply board and the crt as described above 2 Remove the LED retainer and pull out the ...

Page 54: ... the plastic standoffs and gently pull on the board to remove it Removing the Touch Panel The Touch Panel is glued to the front bezel 1 Remove the top cover as described above 2 Disconnect J203 ribbon cable from the Mother Board 3 Use a knife to work a corner of the Touch Panel loose and pull the panel away from the front bezel 4 Feed the ribbon cable through the slot in the front plate 5 Make sur...

Page 55: ...d Conditions All prices are F O B Branford Connecticut Payment Net 30 days Minimum order is 100 on all orders requiring an invoice prior to payment When payment accompanies purchase order no minimum applies A 15 restocking charge will be made on an instrument returned for credit or exchange unless a waiver is issued in writing by an employee of Ivy Biomedical Systems Inc One instruction manual and...

Page 56: ...BOARD LAYOUT DIAGRAMS Model 101R NR Service Manual This page is intentionally left blank ...

Page 57: ...BOARD LAYOUT DIAGRAMS Model 101R NR Service Manual A BOARD LAYOUT DIAGRAMS ...

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Page 59: ......

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Page 61: ...SCHEMATICS Model 101R NR Service Manual B SCHEMATICS ...

Page 62: ...SCHEMATICS Model 101R NR Service Manual This page is intentionally left blank ...

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Page 65: ... AUDIO_OFF AUDIO_SHIELD SPEAKER_GND SPEAKER T500 ALERT_AUDIO DELTRG ALERT_OUT V_SYNC Z Z_GND T150 ECG_AUDIO TREND_INT ECG_X1000 REC_GND LNFREQ 12VREC TRGOUT D D D D D D D D D D D D A D D D D A D D D D A A A A A A A A A A D D D D D D D D D A 12V 12V 12X 12V 5V 5V 5V 5V 12V 12V 5V 12V 5V 12V 12V 12V 12V 12V 5V 8V 8V 12V 5V 7V 7V 12V U13 LF351 3 2 1 5 6 7 4 R92 49 9K TP17 TRIGGER J207 POWER ON LED 1 ...

Page 66: ...MP R19 100 OHM U11C DG201ACJ 9 11 10 C17 1UF CER D25 1N6263 D19 1N6263 R59 10K R73 150K C44 01UF MP R26 80 6K R108 10K RV3 20K TOP V BAL U17B MC34004P 5 6 7 C42 1UF CER C41 1UF CER C18 1UF CER C15 100PF NPO R109 10K R110 162K RV4 5K TOP S R28 15K D1 1N6263 D2 1N4148 J202 YOKE 1 2 3 4 5 RV5 20K TOP H GAIN R27 9 09K R29 30 1K R5 100 OHM 1 2W 5 RV6 5K TOP SYM C8 47UF MP R70 10K R68 49 9K U17C MC34004...

Page 67: ... 7 C138 220PF NPO D37 1N4148 R238 1K C80 47UF MP C91 033UF MP R177 221 OHM C131 6 8UF TANT Q44 PN4393 3 1 2 R178 210K C81 680PF NPO R137 30 1K R187 90 9K RV13 200K TOP 60 HZ ADJ R159 10K R179 80 6K D69 FDH333 R160 150K C82 15UF MP D68 FDH333 R146 100K R180 33 2K R250 50M 5 C71 033UF 5 MP R237 100K R138 12 7K D55 1N4148 R148 178K R161 3 24M C98 1UF CER R139 6 04K C72 033UF 5 MP U54A LT1058ACN 3 2 1...

Page 68: ...R A0 A1 CS CLK0 G0 OUT0 CLK1 G1 OUT1 CLK2 G2 OUT2 VCC GND U52 HM62256LP 12 10 9 8 7 6 5 4 3 25 24 21 23 2 27 22 11 12 13 15 16 17 18 19 20 26 1 28 14 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 WE OE D0 D1 D2 D3 D4 D5 D6 D7 CS1 A13 A14 VCC GND U21 ADC0803 18 17 16 15 14 13 12 11 1 2 3 5 6 7 19 4 9 8 20 10 DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 CS RD WR INTR VI VI CLKR CLK VREF AGND VCC D GND C134 1UF CER U...

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