Kern ABJ, ABS Service Manual
KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen-Frommern
E-Mail: info@kern-sohn.com
Tel: 0049-[0]7433- 9933-0
Fax: 0049-[0]7433-9933-149
Internet: www.kern-sohn.com
GB
Service Manual
Analytical Balances
Page 2
KERN ABS/ABJ
Version 2.1 ABS/ABJ-SH-e-0921
GB
KERN ABS/ABJ
Version 2.1
Service Manual
Analytical Balances
Basic Information
Grundlegende Hinweise
The device must be repaired only by trained specialist staff or personnel with
professional formation (such as a repair-specialist accredited by law concerning
verification).
The service manual is obligatory for repair work.
After repair, original conditions of the device have to be restored.
Only original spare parts should be used.
Instructions about conformity-evaluated scales:
Repair must be carried only at 100% compliance with the type approval.
A violation of this specification will result in a loss of the type approval!
After successful repair the balance will have to be reverified before it can be used
again in a statutorily regulated field.
Das Gerät darf nur von geschultem oder beruflich ausgebildetem
Fachpersonal (z. B. eichrechtlich anerkannter Instandsetzer) repariert werden.
Die Serviceanleitung ist bindend für Reparaturen.
Das Gerät muss nach erfolgter Reparatur wieder in den Originalzustand
zurückversetzt werden.
Es dürfen nur Originalersatzteile verwendet werden.
Hinweis zu konformitätsbewerteten Waagen:
Reparatur darf nur in 100% -iger Übereinstimmung mit der
Bauartzulassung erfolgen. Ein Verstoß gegen diese Vorgabe führt zum Erlöschen der
Bauartzulassung!
Nach erfolgreicher Reparatur muss eine Nacheichung erfolgen, um die Waage
wieder im gesetzlich geregelten Bereich verwenden zu können.
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Contents
1. SERVICE MENU.......................................................................................................... 6
1.1 How to enter the service menu mode......................................................................... 7
1.2 Contents of the service menu mode........................................................................... 8
1.2.1 Model name...................................................................................................... 8
1.2.2 Unloading the built-in weight .......................................................................... 8
1.2.3 Loading/Unloading the built-in weight............................................................ 8
1.2.4 Linear adjustment............................................................................................. 8
1.2.5 Inputting the weight values for linear adjustment............................................ 8
1.2.6 Software version No......................................................................................... 9
1.2.7 Print out the non-volatile RAM data................................................................ 9
1.2.8 Inputting the external weight value used for the calibration of the built-in
weight value. .................................................................................................... 9
1.2.9 Calibration of the built-in weight value ........................................................... 9
1.2.10 Editing the non-volatile RAM data.................................................................. 10
2. HOW TO INSPECT THE UNIT ASSY...................................................................... 11
3. INSPECTION/REPLACEMENT OF THE FULCRUM SPRING,
LOAD SPRING, AND PARALLEL GUIDE ............................................................. 13
3.1 How to dismount the unit assy................................................................................... 13
3.2 Inspect i o n a n d r e p l acement of the fulcrum spring, load spring, and parallel guide....... 13
4. PART REPLACEMENT.............................................................................................. 17
4.1 Replacement of the power board assy ....................................................................... 17
4.2 Replacement of the digital board assy....................................................................... 17
4.3 Replacement of the analog board assy....................................................................... 17
4.4 Replacement of the detector assy............................................................................... 18
4.5 Replacement of the switch panel............................................................................... 18
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5. ASSEMBLING THE CASE ASSY............................................................................ 19
6. BALANCE ADJUSTMENT........................................................................................ 20
6.1 Adjustment procedure of the balance ........................................................................ 20
6.2 How to turn ON the power while avoiding automatic span calibration
(With ABJ series only) .............................................................................................. 21
6.3 Height adjustment of the detector ASSY................................................................... 21
6.4 Adjustment of the shake protector............................................................................. 21
6.5 Mechanical balance and level adjustment ................................................................. 22
6.6 Rough adjustment of the eccentric error.................................................................... 23
6.7 Adjustment of the built-in weight loader mechanism
(With the ABJ series only)......................................................................................... 23
6.8 Fine adjustment of eccentric error............................................................................. 24
6.9 Linearity adjustment.................................................................................................. 25
6.10 Setting the ERROR CHECK ON/OFF...................................................................... 25
7. PERFORMANCE CHECK OF THE BALANCE..................................................... 26
7.1 Environment and conditions for checking the balance.............................................. 26
7.2 Repeatability check.................................................................................................... 26
7.3 Eccentric error check................................................................................................. 27
7.4 Linearity inspection ................................................................................................... 27
8. PART LIST.................................................................................................................... 30
9. TROUBLESHOOTING................................................................................................ 34
9.1 List of troubles........................................................................................................... 34
9.2 Countermeasures for each trouble ............................................................................. 34
9.2.1 “CAL E2”......................................................................................................... 34
9.2.2 “CAL E3”......................................................................................................... 35
9.2.3 “CAL E4”......................................................................................................... 36
9.2.4 “CAL d” ........................................................................................................... 36
9.2.5 “Err 01” ............................................................................................................ 37
9.2.6 “Err 04” ............................................................................................................ 37
9.2.7 “Err 05” ............................................................................................................ 37
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9.2.8 Span calibration (CAL) time is long................................................................ 37
9.2.9 Display is abnormal.......................................................................................... 38
9.2.10 The span points disperse whenever span calibration by using the built-in
weight is performed.......................................................................................... 38
9.2.11 “A CAL” appears frequently............................................................................ 38
9.2.12 The display deviates after stability mark (→) appears..................................... 39
9.2.13 Some sound is heard from the balance............................................................. 39
9.2.14 Nothing appears on the display........................................................................ 40
9.2.15 The switches on the front panel do not work ................................................... 40
9.2.16 The display becomes unstable when something is loaded on the pan ............. 40
9.2.17 Dispersion, fluctuation, zero drift, and poor return of zero point .................... 41
9.3 Checkpoints ............................................................................................................... 41
9.3.1 Detector assy position ...................................................................................... 41
9.3.2 Leak and disconnection of the coil assy........................................................... 41
9.3.3 Display when the power is turned ON ............................................................. 41
9.3.4 Temperature sensor signal check ..................................................................... 42
9.3.5 Dispersion of span calibration.......................................................................... 43
9.3.6 Dispersion, fluctuation, zero drift, and poor return of zero point .................... 43
10. PRINCIPLE OF MEASUREMENT............................................................................ 45
10.1 Magnet coil current value.......................................................................................... 45
10.2 Temperature correction of the current value of electromagnetic coil........................ 45
10.2.1 Temperature correction by the electric circuit ................................................. 45
10.2.2 Temperature correction by software ................................................................ 45
10.3 Linearity correction ................................................................................................... 46
10.4 Span calibration ......................................................................................................... 46
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1. SERVICE MENU
1.1 How to enter the service menu mode
First, let the balance display the weight value.
(1) Hold down both the [ON/OFF] key and PRINT key simultaneously for three
seconds or longer.
(2) Release both the [ON/OFF] key and PRINT key at the same time.
(3) Hold down both the CAL/MENU key and UNIT key simultaneously until the
model name is displayed on the LCD.
ABS has now entered the service menu.
ABJ:
(4) Display for inputting password is shown.
(5) Input the password using UNIT key and PRINT key. The password is
"P___321".UNIT key increases the figure by one and UNIT key moves
the digit to the upper. And PRINT key moves the blinking digit to right.
(6) When the password is set, press TARE key.
(7) Version No. and the model code are displayed and the balance enters into the
service menu.
ABJ has now entered the service menu.
NOTE (ONLY ABJ) : Adjustment log counter(ECTA model)
Note: Adjustment log counter purpose: To secure components that may
not be dismantled or adjusted by the user
Adjustment log counter works when LIN-ADJ and LIN-SET in service menu are
chosen. The indication of log counter is displayed at the time of the power on.
Example: A01- 3.00
A01: adjustment log counter *,
01 increment when enter LIN-SET, LIN-ADJ
3.00: application software version number
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* The number that it is written in label* and LCD displayed number must
correspond.
Label*: It is put on right side of balance. That is shown
temperature range etc.
1.2 Contents of the service menu mode
Contents of the service menu are as follows:
Display on the
Menu contents
LCD
E.AbS22 Model name
w.int Unloading the built -in weight after
loading/unloading it
w.SEt Loading/unloading the built-in weight
t-SPAn Aging
Lin-Adj Linear adjustment
Lin-SEt Inputting the weight values for linear
adjustment
1.00-1.02 Software version No.
--End-- End of service menu (Returns to the weight
display mode.)
EE oUt Printing out the non-volatile RAM data
(A printer dedicated for the balance is required.)
i CAL Span adjustment by the built-in weight (with the
ABJ series only)
CAL SEt Inputting the external weight value used for
span calibration
PCAL.SEt Inputting the external weight value used for the
calibration of the built-in weight value
PCAL Calibration of the built-in weight value (Do not
select this when you are using the ABS series.)
-wAd- A/D value of the load
(Approx. 800,000 to 1,000,000 counts without
any load on the weighing pan (1*): About 2.5
counts/0.1 mg)
-tAd- A/D value of the temperature (15,000 to 17,000
counts at the temperature around 25°C)
-oAd- AD value of the load after temperature
correction (unit: g) (The balance is normal when
the zero point is approx. 1 g. When it is 10 g or
more, the balance might be out of order.)
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-LAd- A/D value after temperature correction and
linear correction (unit: g)
-wG- Weight value
-bAt- Power supply voltage (unit: V)
S.id-Set Inputting Serial No. (Last five digits only)
Edit Editing non-volatile RAM data
trAdE:on Export specification setting (If set to Export
specification, “E” is attached to the left of the
model name
trAdE:oF Domestic specification setting
-End-- End of service menu (Returns to the weight
display mode.)
1.2.1 Model name
Displays the model name and the Domestic/Export setting condition.
“ AbS22” - AbS 220 for Domestic specification setting
“E.AbS22”- AbS 220 for Export specification setting
1.2.2 Unloading the built-in weight
By selecting “w.int”, the balance will unload the built-in weight.
1.2.3 Loading/Unloading the built-in weight
By selecting “w.SEt”, the operational phase of the built-in weight to the balance
proceeds by one step. ((1)→(2)→(3)→(1))
(1) the phase with the built-in weight unloaded.
(2) the phase with the built-in weight loaded.
(3) the phase with the built-in weight incompletely loaded.
1.2.4 Linear adjustment
Linear adjustment can be executed by selecting “Lin-Adj”. (See 6.9 Linearity
adjustment.)
1.2.5 Inputting the weight values for linear adjustment
The weight values for linear adjustment can be input by selecting “Lin-SEt.” (See
6.9 Linearity adjustment.)
Input the true weight values of the following weights.
for the balance with the maximum capacity of 320g:
50g, 100g, 150g, 200g, 230g, 300g, 350g
for Others:
50g, 100g, 150g, 200g, 230g
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How to input: Pressing the UNIT key increases the numeral value at the
blinking digit by one.
Pressing the PRINT
key moves the digit by one.
To validate the input value, press the TARE
"SEt" will be displayed for several sec to inform you that the
input has been validated.
key.
1.2.6 Software version No.
Displays the software versions of the control CPU and the operational CPU.
“1. 00 - 1. 02”: The number in the left indicates the software version No. of the
control CPU and the one in the right indicates that of the
operational CPU.
1.2.7 Print out the non-volatile RAM data
By selecting “EE oUt”, non-volatile RAM data is output to the balance (EP-50 or
EP-60A) connected.
1.2.8 Inputting the external weight value used for the calibration of the built-in weight
value.
By selecting “PCAL.SEt”, the external weight value for calibration of built-in
weight value can be input. Input the true value of the external weight for the
calibration of built-in weight value.
How to input: Pressing the UNIT key increases the numeral at the blinking
digit.
Pressing the PRINT
To validate the input value, press the TARE
"SEt" will be displayed for several sec to inform you that the
input has been validated.
key moves the digit by one.
key.
1.2.9 Calibration of the built-in weight value
With the ABJ series, the built-in weight value can be calibrated by using the
external weight(s).
Never execute this menu (function) with the ABS series balance.
How to calibrate the built-in weight value:
(1) Select “PCAL” in the service menu.
(2) First, the balance checks the zero point.
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(3) Load the external weight on weighing pan (1*) as the already set external
weight value blinks on the LCD .
(4) As “0. 0000 g” blinks after almost 10 sec, unload the external weight from
weighing pan (1*).
While “PCAL 1” is displayed, the balance measures the built-in weight.
While “PCAL 0” is displayed, the balance measures 0 point.
After span calibration by the built-in weight is executed, the balance displays
the weighing value.
1.2.10 Editing the non-volatile RAM data
By selecting “Edit”, the following display appears and the non-volatile RAM data
can be edited.
[Example of display]
00 : 0123
Data is indicated by two bytes.
Address
Meaning of the above display: 01 H is written at Address 00.
23 H is written at Address 01.
How to edit
• Pressing the CAL/MENU key increments the address by one.
• Pressing the UNIT key increases the numerical value of the blinking digit by
one.
• Pressing the PRINT key moves the digit.
• Pressing the TARE
key validates the data of the displayed address.
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2. HOW TO INSPECT THE UNIT ASSY
<Disassembly and Inspection>
(1) Pull out the power cable and remove weighing pan (1*), draft shield ring (2*), and pan
supporter assy (3*). (See Fig. 1 on page 47.)
(2) Remove the case assy. (See Fig. 1 on page 47.)
(2-1) Remove three screws (Semus M4 × 10) and dismount the case assy from the base.
(2-2) Pull out the operation cable from digital board assy (19*). Be careful not to damage
the cable in this occasion.
(3) Remove the analog board cover and the inner case. (See Fig. 4 on page 49.)
(3-1) Remove two screws (Semus M3 × 6) and dismount the analog board cover.
(3-2) Pull out the detector output cable and the coil current cable from analog board assy
(20*).
(3-3) Remove two screws (Semus M4 x 8) and remove the inner case.
Checkpoint 1: Check that the shake protector and the lever pin do not make
contact and no dust exists between them. (See 6.4)
Checkpoint 2: Check the soldering of Pt-Ni band (15*) and check that coil assy
(25*) is not disconnected. (See Fig. 9 on page 54.)
(4) Remove the weight holder and the built-in weight. (With the ABJ series only)
Remove two screws (Semus M3 × 8) and dismount the weight holder and built-in
weight. (See Fig. 7 on page 50.)
Checkpoint 3: Check that no dust adhere to the built-in weight.
Note: Keep the weight holder and the built-in weight away from dirt and/or dust.
Note: Do not lose rubber washers (27*).
(5) Remove the magnet cover. (See Fig. 2-1 on page 48.)
Remove four screws (pan head screw M2.5 × 6) and dismount the magnet cover.
Note: Keep the magnet assy away from dust.
Checkpoint 4: Check that coil assy (25*) makes no contact with the magnet assy
and no dust exist between them. (See Fig. 2-2 on page 48.)
• When they are in contact, loosen the tightening screws of the lever and coil assy
(25*) to adjust the position of coil assy (25*).
• If any dust exits, clean coil assy (25*) and the magnet assy as follows.
How to clean coil assy (25*) and the magnet assy:
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Remove the unit assy from the base. (Refer to Fig. 8 on page 53.)
Remove the magnet cover, then the magnet assy from the unit assy. (Refer to Fig. 2-3
on page 48.)
Clean coil assy (25*) and the magnet assy, taking the dust away from them by using
scotch tape.
Note: Keep the unit away from dust.
Note: Do not hold the error adjustment lever. (Refer to Fig. 8 on page 53.)
(6) Inspection of fulcrum spring (13*), load spring (14*), and parallel guide (37*).
Inspect fulcrum spring (13*), load spring (14*), and parallel guide (37*) according to “3.
INSPECTION AND REPLACEMENT OF FULCRUM SPRING, LOAD SPRING
AND PARALELL GUIDE.”
<Reassembly>
(7) Assemble the magnet cover (4 pcs.) using four screws (pan head screw M2.5 × 6.) (See
Fig. 2-1 on page 48.)
(8) Mount the built-in weight and the weight holder. (See Fig. 7 on page 50.)
Note: Do not mount the weight holder at the wrong direction and do not mount the
rubber washer(s) (27*) at the wrong position.
(9) Adjust the built-in weight loader mechanism. (See 6.7.)
(10) Mount the inner case and the analog board cover. (See Fig. 4 on page 49.)
Note: Do not pinch a cable between the base and the inner case.
(11) Mount the case assy. (See Fig. 1 on page 47.)
(12) Mount draft shield ring (2*), pan supporter assy (3*), and weighing pan (1*). (See Fig.
1 on page 47.)
(13) Adjust the level of the balance, turn ON the power, and check the balance operation.
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3. INSPECTION/REPLACEMENT OF THE FULCRUM SPRING, LOAD
SPRING, AND PARALLEL GUIDE
3.1 How to dismount the unit assy
(1) Same as (1) in Section 2 “HOW TO INSPECT THE UNIT ASSY.”
(2) Same as (2) in Section 2 “HOW TO INSPECT THE UNIT ASSY.”
(3) Same as (3) in Section 2 “HOW TO INSPECT THE UNIT ASSY.”
(4) Same as (4) in Section 2 “HOW TO INSPECT THE UNIT ASSY.”
(5) Remove the unit assy from the base.
Remove four screws (Semus M4 × 25) and dismount the unit assy from the base.
(See Fig. 8 on page 53.)
Note: Keep the unit assy away from dust.
Note: Do not hold the eccentric error adjustment lever of the force cell frame. (See
Fig. 8 on page 53.)
Checkpoint: Check that there is no strain, no crack, and/or no warp with upper
and lower parallel guides (37*). (See Fig. 15 on page 57.)
3.2 Inspection and replacement of the fulcrum spring, load spring, and
parallel guide
<Disassembly and Inspection>
Preparation: Disassemble and assemble the unit assy at a location free from dust.
Attention must be paid to prevent dust from entering the clearance
between parallel guide (37*) and the force cell frame, and the clearance
between the shake protector and the pins for lever.
(1) Remove the blue and the yellow lines connected to the temperature sensor from
detector assy (21*) using a soldering iron. (See Fig. 10 on page 54.)
(2) Remove Pt-Ni band (15*) using a soldering iron. Remove a screw (Semus M4 × 12)
to dismount the relay board from the force cell frame. (See Fig. 9 on page 54.)
(3) Loosen the nut with a wrench and remove the screw bar to which balance weight
(33*) and eccentric weight (*28) are attached, from the lever.
Note: Be sure to perform the work with a shake protector attached. (See Fig. 10 on
page 54) Otherwise, the spring might be damaged.
(4) Remove two screws (M4 × 6) and dismount the shake protector from the force cell
frame. (Refer to Fig. 10 on page 54.)
Note: Be careful not to bend fulcrum spring (13*) and load spring (14*).
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(5) Mount assembling jig (22*) for the ABJ series to the unit assy. (See Fig. 13 on page
56.)
Note: First, secure jig screw A1 tightly, and then insert A2 and A3 in this order.
Finally, tighten A2 and A3. To dismount the assembling jig, execute the
above procedure in reverse.
Replacing coil assy (25*):
By removing the magnet cover and the connection screw between the lever and coil
assy (25*), the coil assy can be replaced. (See Fig. 2-3 on page 48.)
(6) Remove one screw (bolt with a hole, SPG washer, small flat washer) and dismount
the pan supporter assy. (See Fig. 15 on page 57.)
Checkpoint: Check if there is any strain, crack, and/or warp with fulcrum spring
(13*) and load spring (14*).
(7) Remove fulcrum spring (13*) and load spring (14*) with a hex wrench. (See Fig. 13
on page 56.)
Checkpoint: Check if there is any strain, crack, and/or warp with fulcrum spring
(13*) and load spring (14*).
(8) Remove four screws for parallel guide (36*) respectively and dismount upper and
lower parallel guides (37*). (See Fig. 15 on page 57.)
Note: Do not lose the eccentric error adjustment spacer (34*) placed under parallel
guide (37*).
Note: Do not forget the original location of the eccentric error adjustment spacer
(34*) as it must be mounted on that location when reassembled.
Checkpoint: Check if there is any strain, crack, and/or warp with upper/lower
parallel guides (37*).
<Reassembly>
(9) Assemble upper/lower parallel guides (37*). (See Fig. 15 on page 57.)
Note: Align the mount hole of parallel guide (37*) and that of the force cell frame
at the center.
Note: Place the eccentric error adjustment spacer between the upper portion of the
column and parallel guide (37*) where it was placed before, and then fix it
with a screw. (18 kgf•cm)
Note: Do not use a used screw to fix parallel guide (36*).
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(10) Assemble fulcrum spring (13*) and load spring (14*) with the following procedure.
(See Fig. 14 on page 56.)
(a) Place each spring so that the mount holes of fulcrum spring (13*) and load spring
(14*), are aligned with the center of those of the unit assy.
(b) Insert spring set pin (24*) into the upper hole and lightly tighten the lower bolt
ensuring that each spring will not move. (See Fig. 14-1 on page 15.)
Fig. 14-1
(c) Tighten the lower bolt with 20 kg•cm ensuring that each spring will not move.
(d) Tighten the upper screw with the torque free washer touching the end surface of
the lever to prevent the spring from rotating together. (Torque 20 kg•cm) (See Fig.
14-2 on page 15.)
Fig. 14-2
(e) Check if each spring is not bent or cracked.
Note: When replacing fulcrum spring (13*) and load spring (14*), replace three of
them together at one time.
Note: Use the regular bolts, washers, and cup washers (26*) only.
Note: Do not use a used cup washer (26*) again.
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(11) Remove the magnet cover and after adjusting the position of coil assy (25*) (using a
screw), mount the magnet cover. (See Fig. 2-2 on page 48.)
(12) Fix the pan supporter assy with screw. (See Fig. 15 on page 57.)
Note: Tighten the screw with the torque of 25 kg•cm using a hex torque wrench.
Note: Mount the pan supporter so that it is visually parallel to the lever.
(13) Remove assembly jig for the ABJ series (22*) from the unit assy. (See Fig. 13 on
page 56.)
Note: Remove jig screws A3, A2, and A1 in this order.
(14) Incorporate the shake protector so that it does not make contact with the lever pin.
Checkpoint: Make adjustment according to “6.4 Adjustment of the shake
protector.”
(15) Mount the screw bar to which balance weight (33*) and eccentric weight (28*) are
attached to the lever. (See Fig. 12 on page 55.)
Checkpoint: Make adjustment according to “6.5 Adjustment of mechanical
balance and level.”
(16) Mount the relay board and solder Pt-Ni band (15*). (See Fig. 9 on page 54.)
(17) Solder two temperature sensor lines to A and B of detector assy (21*).
Note: Connect the yellow line to A and blue line to B.
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4. PART REPLACEMENT
4.1 Replacement of the power board assy
(1) Same as (1) in Section 2 “HOW TO CHECK THE UNIT ASSY.”
(2) Same as (2) in Section 2 “HOW TO CHECK THE UNIT ASSY.” (See Fig. 5 on
page 51 for the following.)
(3) Pull out the flat cable (26P) from power board assy (18*).
(4) Remove two screws (hex screws) at the RS232C connector portion using a box
driver.
(5) Remove three screws (Semus M3 × 8 and Semus M4 × 8) and dismount power board
assy (18*) from the base.
(6) Set new power board assy (18*) and fix it to the base with three screws.
(7) Tighten two screws (hex screws) at the RS232C connector portion.
(8) Connect the flat cable (26P) to power board assy (18*).
Note: The red line must be located in the left as viewed from the rear of the balance.
4.2 Replacement of the digital board assy
(1) Same as (1) in Section 2 “HOW TO CHECK THE UNIT ASSY.”
(2) Same as (2) in Section 2 “HOW TO CHECK THE UNIT ASSY.” (See Fig. 5 on
page 51 for the following.)
(3) Pull out all the cables from digital board assy (19*).
(4) Remove four screws (Semus M4 × 8) and dismount digital board assy (19*) from the
base.
(5) Mount new digital board assy (19*) to the base with four screws (Semus M4 × 8).
(6) Connect all the cables to digital board assy (19*).
4.3 Replacement of the analog board assy
(1) Same as (1) in Section 2 “HOW TO CHECK THE UNIT ASSY.”
(2) Same as (2) in Section 2 “HOW TO CHECK THE UNIT ASSY.” (See Fig. 4 on
page 49 for the following.)
(3) Remove two screws (Semus M3 × 6) and dismount the analog board cover.
(4) Pull out all the cables from analog board assy (20*).
(5) Remove two screws (Semus M3 × 10) and dismount analog board assy (20*) from
the inner case.
Note: Do not lose the spacer nut (type 1 M4).
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(6) Place the spacer nut (type 1 M4) between new analog board assy (20*) and the inner
case and fix it with two screws (Semus M3 × 10).
(7) Connect all the cables and mount the analog board cover.
4.4 Replacement of the detector assy
(1) Same as (1) in Section 2 “HOW TO CHECK THE UNIT ASSY.”
(2) Same as (2) in Section 2 “HOW TO CHECK THE UNIT ASSY.” (See Fig. 4 on
page 49 for the following.)
(3) Remove two screws (Semus M3 × 6) and dismount the analog board cover.
(4) Pull out the detector output cable from analog board assy (20*).
(5) Remove two screws (Semus M4 × 8) and dismount the inner case from the base.
(6) Remove two screws (Semus M3 × 8) and dismount detector assy (21*).
(7) Mount new detector assy (21*).
(8) Connect the detector output cable.
(9) Turn ON the power and adjust the height and the volume control of detector assy
(21*). See “6.3 Height Adjustment of the Detector Assy.”
(10) Mount the inner case.
(11) Mount the analog board cover.
4.5 Replacement of the switch panel
(See Fig. 6 on page 52 for the following.)
(1) Remove switch panel (9*).
(2) Wipe off dirt on the dented portion.
(3) Paste new switch panel (9*).
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