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ER-A280F/280N (V)   LEAD-FREE SOLDER

■ LEAD-FREE SOLDER

The PWB’ s of this model employs lead-free solder. The “LF” marks indicated on the PWB’s and the Service Manual mean “Lead-Free” solder. The

alphabet following the LF mark shows the kind of lead-free solder. 

When repairing a lead-free solder PWB, use lead-free solder thread. Never use conventional lead solder thread, which may cause a breakdown or an accident. 

Since the melting point of lead-free solder thread is about 40°C higher than that of conventional lead solder thread, the use of the exclusive-use soldering iron is rec-

ommendable. 

Since the melting point of lead-free solder is about 220°C, which is about 40°C higher than that of conventional lead solder, and its soldering capacity is inferior to

conventional one, it is apt to keep the soldering iron in contact with the PWB for longer time. This may cause land separation or may exceed the heat-resistive tem-
perature of components. Use enough care to separate the soldering iron from the PWB when completion of soldering is confirmed. 

Since lead-free solder includes a greater quantity of tin, the iron tip may corrode easily. Turn ON/OFF the soldering iron power frequently.  

If different-kind solder remains on the soldering iron tip, it is melted together with lead-free solder. To avoid this, clean the soldering iron tip after com-
pletion of soldering work. 

If the soldering iron tip is discolored black during soldering work, clean
and file the tip with steel wool or a fine filer. 

5mm

Lead-Free

Solder composition 
code (Refer to the 
table at the right.)

Solder composition

Sn-Ag-Cu

Sn-Ag-Bi
Sn-Ag-Bi-Cu

Sn-Zn-Bi

Sn-In-Ag-Bi

Sn-Cu-Ni

Sn-Ag-Sb

Bi-Sn-Ag-P
Bi-Sn-Ag

a

b

z

i

n

s

p

Solder composition code

a

ER-A280F/280N (V)   MAJOR KEYS USED IN THE SRV MODE

The following major keys are used in the SRV mode.

Programming layout key cover for normal key
Part Code: PCOVB2344BHSA

Note: Free Key layout is available except Receipt paper feed key.

Note: Free Key layout is available except Receipt paper feed key.

Since the master reset has been executed before shipping from the

factory, when the power is supplied initially, the screen enters the ser-

vice mode.

FUNCTION

KEY

DESCRIPTION

CURSOR UP

2

Move cursor to up (1 character)

CURSOR DOWN

4

Move cursor to down (1 character)

CURSOR RIGHT

3

Move cursor to right (1 character)

CURSOR LEFT

1

Move cursor to left (1 character)

PAGE UP

PAGE UP

Move cursor to up (1 page)

PAGE DOWN

PAGE DOWN

Move cursor to down (1 page)

BACK SPACE

BS

Back space

DELETE

DEL

Delete

CLEAR

CL

Clear numeric entry or error message

CANCEL

CANCEL

Operation cancel & back to previous menu

ENTER

ENTER

Data entry

ALL ENTER

TL

All entry terminate

HOME

HOME

Home menu display

COPY

COPY

Copy preset data.

ER-A280F/280N (V)

MASTER RESET AND PROGRAM RESET

1 – 1

In order to operate the cash register properly, you must execute master

resetting before operating for the first time. Follow this procedure.

There are tow possible methods to enter the SRV mode.

• Method1

Operator  can enter the SRV-mode by program reset operation.

Please refer to “Program resetting” about program reset operation.

• Method2

Enter the SRV mode secret code when the MODE menu is displayed.

[MODE] 

3 xxxxxxxx (SRV mode secret code) 3 [ENTER]

If [CANCEL] key is pressed while the top menu of SRV mode is dis-

played, it changes to the REG mode.

Position of MRS1 & MRS2 key is as follows.

MRS1 key : RECEIPT key

MRS2 key : The key located right side of RECEIPT key (A key)

This operation is used as password of MRS operation.

Following key sequence have to enter after operate reset switch.

If you operate wrong sequence then program reset is performed.

• a

3b3c3d

ER-A280N

ER-A280F

Master resetting 1 and 2 can be accomplished by using the following

procedures.

There are two possible methods to perform a master reset.

• MRS-1

Clears the entire memory and resumes initial values.

1) Power is on (Insert the plug into the outlet)

2) Push the reset switch

3) Depress the RECEIPT key with pushing the reset switch

4) Release the reset switch

5) Operate by following key sequence

a

3b3c3d

• MRS-2

Clears the entire memory and resumes initial values. (Master resetting
2 enables the layout of fixed keys in addition to master resetting 1.)

1) Power is on (Insert the plug into the outlet)

2) Push the reset switch

3) Depress the RECEIPT and “A” key with pushing the reset switch

4) Release the reset switch

5) Operate by following key sequence (Secret key operation)

a

3b3c3d

Program the 0 to 9 keys, 00 key, decimal point key, X key, SBTL key,
MODE key, cursor keys, HOME key, and CANCEL key, CL key and

ENTER key and TL key in this sequence.

(This means that the key first pressed is programmed as the 0 key, the
key pressed second as 1 key ---- and the last key pressed as the TL

key.)

To inhibit a particular key, press the 0 key at the point when that key
should be programmed.

a

b

c

d

A

RECEIPT

A

a

b

c

d

RECEIPT

Reset switch

ER-A280F/280N (V)

MASTER RESET AND PROGRAM RESET

1 – 2

1) Power is off (power plug is pulled out)

2) Push the reset switch

3) Insert the power plug into the outlet with pushing the reset switch

4) Release the reset switch

This resetting resumes the initial program without clearing memory.

Note:

When power is on, the reset switch is operated.

Then there is possibility to break RAM data.
So, in Program reset, power plug is pulled out first.

And it is also the same for master reset.

But in master reset, RAM will be clear.
And we think it is not problem to break RAM data by operating the
reset switch when power is on for master reset.