Erba lyte service manual

Service Manual

ERBALYTE


Company Contact Details:
ERBA MANNHEIM
Mallaustrasse 69-73
68219 Mannheim Germany
Tel : (49-6-21) 8799770
Fax : (49-6-21) 8799688


Preface

In order to operate and service the instrument properly, please read the
operation manual and service manual carefully before operating.
When receiving the goods, please check the product model and spare parts
against the packing list. If missing or mistake, please contact Erba immediately.
Non-authorized personals are not allowed to open or repair the
instrument. The instrument must be grounded properly.
Never connect the plugs of the rear panel with electric metal materials.
Always remember to disconnect the power cable from the instrument
before open it. Do not remove any symbols from the instrument.
The waste may contain materials harmful to human body. It should be
discarded according to the safe laboratory procedures and government regulations.

-i-


Contents

Chapter 1. Instrument installation ....................................................................... 1
1.1 System introduction ........................................................................................ 1
1.2 Environment requirements ...............................................................................3
1.3 External Connections ...................................................................................... 3
1.4 Internal Connections ....................................................................................... 3
Chapter 2. Power-on check ................................................................................... 5
2.1 Self-test and adjustment .................................................................................. 5
2.2 Prompts during self-test and calibration........................................................... 7
Chapter 3. Function description and operation ..................................................... 8
3.1 Flow chart of the operation ............................................................................... 8
3.2 System functions .............................................................................................. 8
3.3 Extended programs: ......................................................................................... 8
3.4 Routine operation ............................................................................................ 10
Chapter 4. Routine maintenance .........................................................................13
4.1 Daily maintenance........................................................................................... 13
4.2 Weekly maintenance ........................................................................................ 13
4.3 Monthly maintenance...................................................................................... 13
4.4 Check tubing system ....................................................................................... 13
4.5 Check the sample probe .................................................................................. 17
4.6 Electrode maintenance and replacement ......................................................... 17
4.7 Maintenance of pump, valve and lifting unit ................................................... 19
Chapter 5. Hardware ........................................................................................... 21
5.1 Connector and Cable list ................................................................................ 21
5.2 PCB errors...................................................................................................... 21
5.3 Description of RS-232 interface....................................................................... 22
Chapter 6 Trouble-shooting ................................................................................ 24
6.1 Error prompts ................................................................................................ 24
6.2 Possible causes of errors ................................................................................ 25
6.3 Trouble-shooting of positioner and electrode................................................... 26
6.4. Slope unstable .............................................................................................. 26

6.5 Slope abnormal .............................................................................................. 27
6.6 AB slope and result abnormal ........................................................................ 27
6.7 Auto sampler trouble shooting. ...................................................................... 27
6.8 Aspiration abnormal ....................................................................................... 28

- ii -


Chapter 1. Instrument installation

1.1. Rear panel

1.

Power switch

2.

Power

3.

RS-232 serial port

4.

Grounding pole

5.

Machine label

socket

(including

fuse holder)

-2-


1.2 Environment requirements
1.

The instrument should be installed on a stable and solid platform that is free of
mechanical vibration and away from vibration source.

2.

The environment should be as free as possible from dust, corrosive gas, loud noises
and electrical interference.

3.

Avoid placing the instrument in direct sunlight or in front of a source of heat or vent.

4.

Ambient temperature: 10~35 , relative humidity:20%-85%.

5.

The power supply should be AC220/110V±10%, 50/60 Hz

6.

Power supply and grounding should be connected correctly.

7.

No strong electric field and magnetic field interference.

1.3 External Connections

1.

Power cable: should be connected to the power socket firmly and reliably
without loose or poor connection.

2.

Grounding: the grounding pole should be connected to ground properly. The grounding
wire should be as short as possible and the grounding resistance must be less than 10Ω

3.

If the power supply to the instrument is not stable, or there are high-power equipments
on the same line, then a power stabilizer (output ≥100W) is strongly suggested.

4.

Avoid

operating

the

instrument

under

high

humidity

environment

for

long

time,

otherwise

the instrument performance may be affected. Use desiccant or air

conditioner in case of necessary. Do not place the instrument near a water pool.

1.4 Internal Connections

Press the front door to open it.
1.

Pump tube installation: put the aspirating pump tube and the lactic pump tube
on the pump head, fix the tube connectors to the bracket, adjust the tube to the
middle of the pump head.

-3-


2.

Check the electrode assembly: take out the electrode assembly from the accessory kit. Check if the
setting screws are tightened, inlet and outlet port are clean, the filling solution of each electrode is
sufficient. If there are bubbles on the electrode probe, tap the electrode slightly to let
the bubbles disappear.

3.

Installation of the electrode assembly: insert the whole assembly to the mounting base, connect the
lead wire of each electrode (K、Na、Ca、PH、CL、Ref) to the plug of amplifier board correctly.
Connect the tube to the inlet and outlet port of the assembly.

4.

Check the liquid positioner: replug the positioner and make sure it is well connected.

5.

Check the tubing: make sure all the tubings are connected tightly and there is no leaking.

6.

Connect to the reagent pack: connect the Std A tube to port A of the reagent pack. Connect the Std B
tube to port B. Connect Std R tube to port R Connect the waste tube to port W.

7.

Installation of printing paper: open the printer cover, insert the printing paper into the guide slot (the
thermal side face down), feed the paper out from the slot on the printer cover.

Note:
a

Make sure all tubings are connected firmly and there is no leakage.

a

Make sure the positioner is connected firmly.

a

Make sure all the lead wires of the electrodes are connected firmly.

a

Make sure there is no bubble on the electrode probes.

a

The printing paper is using out when you see two red lines on it. Change
the printing paper in time.

-4-


Chapter 2. Power-on check
2.1 Self-test and adjustment

When switched on the power to the instrument, a system self-test
automatically.

will

be performed

The operator may be required to do some adjustments to ensure the

instrument operates satisfactorily under given conditions.

Operation

Function properly

Switch on the power,
the LCD light on.

Possible problems

-External power supply, power -External
switch,

internal

supply works properly
- LCD and cables works properly

power

supply,

power

power

switch

connections or fuse is
not good.
- Internal power supply
doesn’t work properly.

Detect the positioner,
printer and auto
sampler(if connected)

- The positioner works properly

- The positioner loose.

- The printer works properly

- The printer cables or
internal power supply is

- Auto sampler works properly

not good
- The

system

will

not

give alarm or stop even
if

errors found

on

the positioner or printer.
The

operator

should

turnoff the instrument
manually and solve the
problem.
Feed paper and print- - The power supply and paper
out the system version

- Internal power supply

feeding of the printer is good
- Data transmission of the
printer is good

is not good
-

The
is

printing

paper

not installed

correctly.
- The printer cables are
loose or not good.
Sample probe moves - The lifting motor, limit switch
up until it touches

the

position

switch, then
down

to

and cables work properly.

limit Check
moves probe

if

the wash position during the movement.

-5-

not good

sample - Adjust or replace the

is bended or out of

block

¶

the

- The lifting mechanism is

sample probe if
necessary



Calibrating …

-The liquid distribution valve -The system gives alarm
and optical coupler,

lifting

and

mechanism, switches

and

found

software works properly.

stops

if

errors

on

liquid

distribution valve, lifting
mechanism or switches.

The

instrument - Pump motor works properly

-Pump motor is malfunction

aspirates Std B and - The tubing system is good if - The
Std

A in

turn for

test

and

display

the voltages

the

of

voltage

display - The inlet tubes for Std A
and

operation manual

connected

function

turn
of

off

system

self-test
If

there

is

are

to

the

wrong ports

valve,

aspirated

A, - If slope is not stable,
then it shows “shift”

signal - If slope is abnormal,

detection and data

then it shows “X”

processing work normally

enters

into main menu after

Std

B, tubing connections,

pump,

Std.B

voltage - Std A or Std B is not

program.
after - All electrodes,
Std

tubing

system is leaking

display or print by extended

The

the

and print please refer to the

the

OK
OK
OK
OK
OK

position,

showing

into

- The operator can

54.5
52.3
51.6
25.5
55.6

correct

reach

aspirated
-Details

Slope
K：
Na：
Cl：
Ca：
pH：

cannot

Std B and Std A can be
distribution valve correctly

Screen display
calibration:

liquid

-Refer to trouble-shooting
for the

reason

unstable

or abnormal

of

slope

MainMenu
Sample

Cal.

W. List

STD

Service

Results

no - the internal clock works
more normally

- The

internal clock

is

malfunction

if

the

than 2 minutes, the

system can

not

enter

system

into

operation

for
will

enter

into standby

mode

standby mode

Note:
Try the other side of the printing paper or change the whole paper roll if there is no
printing on the paper. Adjust the position of the paper if it is misalignment.
If the sample probe is found distortion, misaligned or bended, the operator should
adjust or change the probe and make sure it can move into the wash block correctly.
If

the

aspiration

connections,

is

abnormal,

the

operator

should

check

the

tubing

reagent connections and electrode connections and make sure there

is no blockage or leakage.
Activate the electrode for 10-30 minutes before using if the electrode has
been stored or not used for a long time. Run calibration when electrode is stable.
-6-


2.2 Prompts during self-test and calibration
2.2.1 Display Prompts

Code

2.2.2

Error

1

The optical coupler of liquid distribution valve failed

2

Elevator switch failed

Print Prompts

Code

Error

Error 0#

Liquid positioning failed

Error 1#

Liquid detecting failed

Warn 2#

Bubbles detected

Error 3#

Too much or less sample aspirated

Error 4#

Slope abnormal

Error 5#

Slope unstable

Error 6#

AB Slope abnormal

Error 7#

AB Slope unstable

For the solutions please refer to “Trouble-shooting”

-7-


Chapter3. Functional description and operation
3.1 Flow chart of operation
Please refer to the operator’s manual.

3.2 System functions
Please refer to the operator’s manual.

3.3 Extended programs:
Press Service in the main menu, press Time and enter “983”, press Exit, then the system

will enter into
extended program menu, the screen displays:

(Attention: the extended programs are not open for the end-users to avoid wrong setting)
3.3.1 Print voltage
Press Pr.Vol , the button turns white. The voltages of the liquid positioner and all
electrodes will be printed out during calibration or sample measurement.
Press Pr.Vol again, white color disappear from the button. The voltages will not be
printed out
During calibration or sample measurement. This is the default setting.
-8


3.3.2 Print PH value
Press Pr.PH , the button turns white. The pH value will be printed out when the
sample measurement is completed.
Press Pr.PH again, the button turns dark. The pH value will not be printed out when
the sample measurement is completed. This is the default setting.
3.3.3 Print TCa
TCa is a calculated parameter.
Press Pr.TCa , the button turns white. The value of iCa and TCa will be printed out
when the sample measurement is completed.
Press Pr.TCa again, the button turns white. Only the value of iCa will be
printed out when the sample measurement is completed. This is the default setting.

3.3.4 Adjust pH
This function has been fixed at factory, no need to adjust it again.

3.3.5 Standby mode setting
The instrument will enter into Standby mode if there is no operation in 2 minutes. In

standby mode, the operator should press Wake Up to activate the instrument to the
working mode. If the instrument stays in standby mode for 4 hours, it will maintain the
electrodes automatically. When wake up the instrument, it will carry out a calibration
before returning to the working mode.
The operator can change the waiting time for entering into standby mode. The suggested
waiting time is 2-60 minutes.
To change the waiting time, press Standby ,input the value, then press Yes to confirm.

3.3.6 Test Valve
The liquid distribution valve may be blocked or leaking after using for a long time. The
measuring results could be affected. Therefore it is necessary to check the valve
periodically.
Touch Valve, the system will aspirate Std A and Std B automatically. Observe the
aspiration volume, flow speed, the switch of Std.A/Std.Bin the valve and the bubbles to
determine if the valve is working properly or not.

-9-


3.3.7 Show voltage
Press Showmv, the button turns white. The voltages of the liquid positioner and all
electrodes will be displayed on the screen during calibration or sample measurement.
Press Show mv again, the button turns white. The voltages of the liquid
positioner and all electrodes will not be displayed on the screen during calibration or
sample measurement.

3.3.8 Setup the reference range
Touch Range, the screen displays:
K

1 xxx

2 xxx

Na

3 xxx

4 xxx

Cl

5 xxx

6 xxx

ica
Tca

7 xxx

8 xxx

9 xxx

10 xxx

PH
Set

Exit

PressSet, input all the reference values in turn,thenpress Exit to quit.

3.3.9 Record of de-protein operation
Press Pr.Clea to print out the last date that the de-protein program been performed.

3.4 Routine operation

3.4.1 Safety precautions
1. The electric voltage inside the instrument

may be harmful to human body.

Do not open the instrument without disconnecting it from the power supply.
2.

3.

Because the samples may have pathogenesis bacterium or viruses, all replaced
tubes, electrodes and

waste

the

procedures

safe

laboratory

containers

should

be

discarded

according

to

and government regulations.

The reagents are irritating to eyes, skin and diaphragm. Wear proper personal protective
equipment (e.g.gloves, lab coat, etc.) and follow safe laboratory procedures when
handling them in the laboratory.

- 10 -


4. The reagents are harmful to human body. If the reagents accidentally spill on your skin,
wash them off with plenty of water and if necessary, go to see a doctor.
5.

If the reagents accidentally spill into your eyes, wash them off with plenty of water and
immediately go to see a doctor

3.4.2 Sample Collection and handling
Sample

collection

Always

avoid

1.

and

handling

must

be

carried

out

by

the

professionals.

the hematolysis. In addition, the following points should be noted:

The serum or plasma can be stored in the refrigerator, but they must be warmed up
to room temperature before test.

2.

When preparing the blood serum samples, do not add any materials like the surface
active agent that may interfere in the measurement or even damage the sensor.

3.

Hemolysis can affect K result significantly as well as other parameters. Special remark
should be made for hemolysis sample, and the results are for reference to the lab only.

4.

If the serum has not been separated completely, the fibrins in the sample may affect the
aspiration, and the proteins may deposit inside the tubing thus causing contamination
or blockage. In such a case, the results will be affected, so the operator should clean the
tubing on time.

5.

The sample should be tested within 2 hours, otherwise the result may be not accurate.

3.4.3 Operation precautions
1.

The analyzer is designed to work continuously for 24 hours a day. No need to shut
down the machine everyday.

2.

Do not use the standard solutions of flame photometer. They include strong
acid and other supplements that may damage the electrodes.

3.

Not all commercial controls are suitable for ISE measurement. Some of them contain
too much chemical additives that may interfere in the measurement.

4.

The bubbles should not be aspirated during sample aspiration, otherwise the
results will be unreliable.

5.

When the sample reaches the checking point, make sure there are no bubbles
inside, otherwise the samples should be measured again.
- 11 -


6.

Never aspirate the sample directly from the blood separating tube, because
it is very easy to block the tubing system. Always move the serum to a small
and clean tube or cup with a pipette before testing on the instrument.

7.

If the ambient temperature fluctuates for more than 10 , the instrument should be
calibrated again

8.

The pH value of the standard solutions and the samples should be within 6-9,
otherwise it will interfere in the measurement of sodium ions.

9.

Discard the reagent if mild dew or deposition found.

10. Perform the routine maintenance according to the manual.
11. Every electrode has a serial number. Keep it on the electrode. The warranty of the
electrodes will become invalid if the number is not mentioned.
12. When removing the sample tube after aspiration, be careful not to hit the sample
probe, otherwise the probe will bend or get misaligned and may not move into the
wash block properly.
13. Do not open the front door during calibration or sample measurement, otherwise
the result will be affected.
14.

Check and make sure the grounding is good if static interference is found.

3.4.4 Daily operation
Please refer to the operator’s manual.

- 12 -

Chapter 4. Routine maintenance
4.1 Daily maintenance
Keep the instrument clean, especially the sampling unit.

4.2 Weekly maintenance
1.

Check the electrodes and make sure the filling solutions are sufficient. Add filling
solution if the volume is less than 2/3.

2.

Check if there is salty crystal on the internal electrode, if so, clean it with wet tampon.

3.

Check and clean the rubber in the wash block. Clean the sample probe.

4.

Run deprotein program in service menu. (If less than 5 samples per day,
then just run deprotein program every 2 weeks) Check and clean the tubing system.

5.

Run “Na adjust” program if the slope of Na electrode is less than 50.

4.3 Monthly maintenance
1.

Check the tubing system and make sure there is no blockage or leakage.

2.

Check the internal electrode and make sure it doesn’t blanch or its coating doesn’t flake
off. Change the internal electrode if necessary. Check the filling solution, change it if it
become contaminated or dirty.

3.

Observe the voltage of the electrode. If the voltage of K,、Na,、Cl are all less than 20 mV,
then change the reference filling solution first. If it doesn’t improve, change the reference
membrane.

4.

Run calibration if the slopes are low.

4.4 Check tubing system
Check the tubing system if the aspiration volume or flow speed is abnormal, or bubbles
found. Observe the flow speed, liquid position and bubble status during sample test or
calibration.
1.

Blockage will cause insufficient aspiration volume for sample, Std A and Std B, or no
aspiration at all if the blockage is very bad.
- 13 -

2. Leakage will cause bubbles or no aspiration.
3. A segment of air will appear in the tube when the liquid distribution valve switches
between Std A and Std B. When aspirating Std A, if small bubbles found at the
outlet of distribution valve, then the flow path inside the distribution valve for Std A
is leaking. If bubbles always stay at the inlet of Std A and can not be excluded, then
the flow path for Std A is blocked slightly. Check flow path for Std B by the same way.
4.

The blockage in the distribution valve is usually caused by contamination
in Std A or Std B. It is important to keep the reagents under proper temperature.

5.

The bubbles will appear near the connector if it is leaking. Tighten the tube or
connect it again. Cut a small piece of tube if necessary.

6.

If leakage found between the electrodes, then the O ring between the electrodes may
not be present or maybe out of position, or the setting screws might not be not
tightened.

7.

If the pump tube is distorted, leaking or aged, it will cause no aspiration, insufficient
aspiration volume or incorrect liquid position. Change the pump tube if necessary.

8.

Wash the tubing system regularly to prevent the blockage caused by protein

deposition. Clean the sample probe externally. Clean the wash block.

- 14 -



4.5 Check the sample probe
1.

Adjust the sample probe if it is misaligned or bend. Make sure the sample probe
can move into the wash block smoothly and correctly.

2.

If the sample probe is blocked, move it up to top position, take the probe out, and
use a thin needle to remove the blockage from the probe.

3.

If the wash block is blocked, lift up the sample probe, remove the cover of the wash
block, take out the rubber and clean it.

4.6 Electrode maintenance and replacement
4.6.1 Structure of the electrode

(For Erba lyte plus there will not be Ca & PH electrode)

4.6.2 Replacement of internal electrode and filling solution
Follow the steps below to replace the internal electrode or filling solution:
1.

Pull out all electrode wires from the plugs. Remove the tubes from the inlet and
outlet of the electrode assembly.

2.

Loose the fixing nuts of the electrode assembly.

3.

Disassemble the whole electrode assembly.

4.

Discard the electrode to be replaced.

5.

Take a new electrode and add the filling solution.

6.

Assemble the electrodes in correct order. Make sure that the rubber gaskets are in
right position.
- 17 -


7.

Tighten the fixing nuts of the electrode assembly.

8.

Connect the tubing to inlet and outlet. Insert the electrode wires back to the plugs.

9.

Run calibration again.

If the internal electrode blanches or its coating flakes off, then remove the old filling solution,
add fresh filling solution and install a new internal electrode.
Change the filling solution if it is insufficient or the slope of the electrode is too low. Take
out the internal electrode (do not touch any metal materials), remove the old filling solution,
add fresh solution to 85% of total volume, thenput the internal electrode back and tighten it.
K filling solution is for K electrode only, Ca filling solution is for Ca electrode only, and
reference filling solution is for reference electrode only. Na/Cl filling solution is for Na, Cl and
pH electrodes.
4.6.3 Replace the reference membrane
Follow the steps below to replace the reference membrane:
1.

Pull out all electrode wires from the plugs. Remove the tubes from the inlet and
outlet of the electrode assembly.

2.

Loose the fixing nuts of the electrode assembly.

3.

Take out the reference electrode.

4.

Loose the screw cap, take out the internal electrode, remove the filling solution, O-

5.

Soak

6.

Refill the reference filling solution and tighten the screw cap

7.

Clean and dry the electrode.

ring and old reference membrane (see the following figure).
evenly

8.

the
on

new
the

reference

membrane

in distilled

water,

then place

it

internal interface and put on the O-ring.

Assemble the electrodes in correct order. Make sure that the rubber gaskets are in
right position.

9.

Connect the tubing to inlet and outlet. Insert the electrode wires back to the plugs.

10. Run calibration again.

- 18
-


4.7 Maintenance of pump, valve and lifting unit
4.7.1 Maintenance of aspirating pump
After long time of using, the pump tube will get aged and may cause inaccurate
aspiration volume and result in bad results. So, it is necessary to change the pump tube.

If there is big noise when the pump head rotating, disconnect the pump tube, pull
out the pump head, loose three setting screws, take out the plate, add a little lubrication
oil to the ball bearing, then assemble the pump head back. If the pump head is damaged,
then change it with a new one.
4.7.2 Maintenance of distribution valve
The function of the distribution valve is to switch the flow path to Std A or Std B according
to the control program. The valve status is detected by an optical coupler. The performance
of the optical coupler can be affected by dust or foreign objects, and may cause
wrong

switching

between

Std

A

and

B.

In

such case,“1#”、”2#” or “3#” error

message will be shown on the screen and will be printed out. Clean the optical coupler
periodically.
Disassemble the valve:
Loosen the four setting screws on the valve plate, pull the whole valve out a little, loosen

four nuts, take out the valve plate and four copper standings, loose the setting screws for
the optical coupler. Take out the optical coupler. Turn the valve head with a tweezers and
take it out. Loose two screws on the valve cap and take the cap out. Clean five O rings on
the valve cap. Clean the valve body and rotor.
Assemble the valve:
Install the rotor and cap to the valve body, tighten two screws. Pay attention to the five O
rings on the cap. Install the optical coupler to center position. Put on the valve head,
tighten the screws on the valve motor axis. Put the copper standings back, tighten
the valve body to the plate. Tighten the valve plate to instrument.
Note:
Pay attention to the position of the O-rings, copper standings, optical coupler and
connectors of Std.A and Std.B
- 19 -


Maintain the valve once every year. Keep the optical coupler clean and check it
periodically.

4.7.3 Lifting unit
The maintenance of the lifting unit is by removing the dust, foreign objects and oil dirt
from it. Remove the cover of the sample probe, remove the sample probe, clean the axis and
add a little grease. Let the sample probe move up and down for several times, make sure it
moves smoothly and low noise.

Note:
The electrode should be sealed and stored under dry environment. Do not add filling
solution to it.
The tubing and O-rings should be sealed and stored under dry environment.
The internal electrode should be sealed and stored under dry environment. Do not
store with metal materials.

- 20 -


Chapter 5. Hardware
5.1 Connector and Cable list

Connector Cable

Connector

Cable

J101

Optical coupler cable

J203

Positioner cable

J102

Elevator switch cable

J204

Signal cable

J103

Auto sampler home
position optical coupler
Auto sampler counter
optical coupler cable

J205

RS232 cable

J206

Pressure sensor cable

J104
J107

Transformer output cable

J207（PRT）

Printer data cable

J108

Printer power cable

J207（Key）

Touch screen cable

J109

Air
outlet
valve
connection cable

J208

LCD cable

NBQ

LCD inverter power cable

J110

Liquid outlet valve
connection cable

J111

Mixing motor
supply cable

J112

Auto sampler motor cable

J114

Lifting motor cable

J115

Valve motor cable

J116

Aspirating Pump motor
bl
Lactic acid pump motor
cable

J117

power

5.2 PCB errors

1.

Because of vibration or dust accumalation, the connectors or IC chips may have
loose connections. Disconnect the power cable, open the rear cover, and check the cables
and IC chips.
- 21 -


2.

When after switch on the power, the LCD doesn’t light on, the lifting unit doesn’t work,
the pump motor doesn’t work: check 9-pin DC power cable and transformer output cable
J107.

3.

When switch on the power, the LCD doesn’t light on, but the lifting unit work normally:
Check U102 (LM7812)、9-pin DC power cable, NBQ connector and 12V voltage.
The LCD inverter may be damaged.

4.

The lifting unit can not move, the valve doesn’t work: Check U103 (LM7812)、
9-pin DC power cable、U106、U107.

5.

The pump motor doesn’t work: Check U110、LM7812、9-pin DC power cable、U108、
U109

6.

The signals of calibration or measurement are confused or all zero: check cable J204.

7.

If the program works incorrect, clean the dust accumulated around U301 IC chip and
check. It is recommended to clean PCB with pure alcohol and blow to dry.

8.）Auto sampler doesn’t move, check U104, 74HC373,U105, ULN2803A.
9.）No AB test result, check J206 connector and U209, LM324.
10.）No print. Check J108, J207(PRT) connectors and the connectors between printer head
and print control board. Replace the printer head if it is broken.

Note:
Only authorized personnels are allowed to repair the PCB.

5.3 Description of RS-232 interface

The analyzer can send or receive command/data via RS-232 interface.
5.3.1 Features
Electric feature： comply with EIA RS232C Transmission mode： asynchronism
Stopbit

1digit

Databit 8digit
Paritybit none
Transmission speed：

19200 baud

- 22 -