Sharp ER-A220 (serv.man2) Service Manual ▷ View online
ECR-ER-02FD cable
Fig. 3-2
Interfacing signals
Pin
No.
Signal
name
In/Out
On level
Description
1
GND
—
—
Signal ground
2
ER
Out
Low
Equipment ready
3
DR
In
Low
Data set ready
4
RXD
In
High: MARK
Low: SPACE
Receive data
5
TXD
Out
High: MARK
Low: SPACE
Transmit data
6
CD
In
Low
Carrier detect
7
RR
Out
Low
Ready to receive
8
CS
In
Low
Clear to send
9
RS
Out
Low
Request to send
4. Application specification
The following service (SRV) modes are available for the serial data
transfer of the ECR
1) Data transmit (Source side)
2) Data receive (Target)
5. Data format
A single byte image of the RAM data to be transmitted is divided into a
high order 4 bits and low order 4 bits and converted into ASCII code.
high order 4 bits and low order 4 bits and converted into ASCII code.
Then, the image of the memory is sent in the following format:
Memory top address: 0000H FFFFH
Top address of the memory to be transmitted in ASCII number.
Page : 00 02
Page of the memory to be transmitted in ASCII number.
Page of the memory to be transmitted in ASCII number.
Sum check
End code : Hex 0D
NOTE : In order that contents of RAM memory may not over-ride
pages for this job, RAM image is sent in unit of 64 bytes from
the address 0000. In other words, 128 bytes are sent at one
the address 0000. In other words, 128 bytes are sent at one
time on the transmit data format.
RAM DATA FORMAT
Exhibit :
Code table
HEX
ASCII
Character
HEX
ASCII
Character
0
30
0
8
38
8
1
31
1
9
39
9
2
32
2
A
41
A
3
33
3
B
42
B
4
34
4
C
43
C
5
35
5
D
44
D
6
36
6
E
45
E
7
37
7
F
46
F
6. END record
End message:
Fixed to 30303030.
End massage:
Fixed to 4646.
Sum check
End code:
CR (0D)
SD
2
SD
RD
CTS
RD
3
6
5
3
2
6
8
ER-02FD
7
5
SG
RTS
4
DCD
8
DTR
20
DSR
7
1
4
ECR
CTS
SG
RTS
DCD
DTR
DSR
1
FG
FRAME GROUND is connected
to the shield of the cable.
to the shield of the cable.
25PIN D-SUB
9PIN D-SUB
SD : TRANSMITTED DATA
RD : RECEIVED DATA
DTR: DATA TERMINAL READY
DSR: DATA SET READY
RTS: REQUEST TO SEND
DCD: DATA CARRIER DETECTOR
CTS: CLEAR TO SEND
FG : FRAME GROUND
RD : RECEIVED DATA
DTR: DATA TERMINAL READY
DSR: DATA SET READY
RTS: REQUEST TO SEND
DCD: DATA CARRIER DETECTOR
CTS: CLEAR TO SEND
FG : FRAME GROUND
96
X
#/TM/ST
TL/NS
98
X
#/TM/ST
TL/NS
1
2
3
4
Data (128bytes)
BD
7E
83
FC
03
B6
42 44 37 45 38 33 46 43 30 33 42 36
30
3
4
30
30
30
1
2
7. Operational method
1) To prepare an ECR to receive data from another ECR or the ER-
02FD, the memory size of the receiving unit must the same as or
greater than the sending unit.
greater than the sending unit.
2) Master reset the receiving ECR.
3) Connect loader cable between ECRs.
4) Set the receiving ECR ready to receive.
5) Start the sending ECR.
6) Transmission status.
Description of error status
1 : Application error (Command error)
2 : Application error (Parity error)
3 : Application error (Check sum error)
4 : Application error (Data size error)
5 : Hard ware error
6 : Power off error
7 : Time out error
8 : DSR off error(when data transmission starts)
11 : Application error (Transmit data size error)
12 : Application error (Block sequence error)
15 : Application error (different model error)
7) Service reset the receiving ECR.
8. Saving/Loading of data to/From the FD
unit Configuration
1) Turn off the power switch of the ER-02FD, and set the DIP
switches of the FD unit as follows:
ER-02FD (The ER-01FD functions of the ER-02FD are
used.)
used.)
2) Connect the cable.
Saving data
1) Turn on the power switch and insert a floppy disk which has been
formatted.
2) Start the SEND JOB on the ECR side as follows:
3) Data transmission is started and the green lamp on the ER-02FD
blinks.
Loading data
1) Turn on the power switch and insert the floppy disk which stores
the data.
2) Start the RECEIVE JOB on the ECR side as follows:
3) Press the SEND key on the FD unit.
4) Data transmission is started and the Green lamp on the ER-02FD
blinks.
5) Service reset the ECR.
96
X
#/TM/ST
TL/NS
98
X
#/TM/ST
TL/NS
OFF ON OFF OFF OFF ON
X
ON OFF OFF
OFF ON
DS-1
1
2
3
4
5
6
7
8
1
2
3
4
DS-2
Data rate
4
6
Rate [bps]
OFF
OFF
19200
Disk format
CCP/M: OFF
PC-DOS: ON
CCP/M: OFF
PC-DOS: ON
ON
OFF
9600
96
X
#/TM/ST
TL/NS
98
X
#/TM/ST
TL/NS
CHAPTER 7. SERVICE PRECAUTION
1. Cautions to be taken when removing
the upper cabinet
When removing the upper cabinet, first remove the printer cover
and then remove the upper cabinet from the let side, as shown in
the sketch below.
the sketch below.
2. Cautions to be taken when installing
the pop-up display connector cable
Exercise care not to have the wrong direction of the pop-up display
connector cable when connecting the cable to the Key I/F connector
CN14.
CN14.
When connecting the cable, make sure:
The cable is not kinked.
The cable contact surface points upward against the PWB when
inserting the cable.
inserting the cable.
CN14
Surface points
CHAPTER 8. IPL (Initial Program Loading) FUNCTION
The application program of the ER-A220 is written on the CPU internal
FLASH ROM.
When servicing the unit, it is necessary to write the application pro-
When servicing the unit, it is necessary to write the application pro-
gram on the CPU internal FLASH ROM.
When the CPU is changed :
The following CPUs delivered as service parts do not have the
application program written on them.
application program written on them.
PARTS NAME
PARTS CODE
LOCATION No.
CPU
IC8
When the application program is changed, such as when the ver-
sion is updated.
sion is updated.
Use the MASTER ROM (EP-ROM : 256 kbyte) to write the applica-
tion program.
PARTS NAME
PARTS CODE
LOCATION No.
MASTER ROM
Attach to the IC
socket of IC2.
socket of IC2.
IPL operating procedure
Power off the ECR.
Set the short pin : SP1 to the IPL mode on the main PWB
Install the MASTER ROM (EP-ROM) to the IC SOCKET : IC2 on
the main PWB
Power on the ECR.
Enter the Service rest.
(Turn the Mode switch from SRV’ to SRV position.)
When writing is finished, power off the ECR.
Return the short pin:SP1 to the Normal mode.
Remove the MASTER ROM (EP-ROM) from the IC socket:IC2.
Power on the ECR.
Master reset.
(While holding down PAPER FEED key, Mode switch turn to SRV’
position to SRV position. )
IC2:Install the MASTER ROM (EP-ROM)
SP1 : IPL mode
Normal
IPL
IPL mode
Service reset starts
The CPU operating clock is set.
(2 multiplies of the main clock
are selected)
(2 multiplies of the main clock
are selected)
Control moves to memory
expansion mode.
expansion mode.
External bus software wait + 1
is set.
is set.
Master ROM data is confirmed.
If the external ROM data is
correct, writing starts.
correct, writing starts.
When writing is finished, the
buzzer sounds (3 short beeps).
buzzer sounds (3 short beeps).
If the external ROM data is not
correct, the buzzer keeps
sounding (requesting resetting).
correct, the buzzer keeps
sounding (requesting resetting).
By setting SHORT PIN:SP1, the
CPU runs into the IPL mode.
CPU runs into the IPL mode.
IPL program is copied from
Master ROM to the CPU internal
RAM.
Master ROM to the CPU internal
RAM.
Control jumps to the copied
program on the CPU internal
RAM.
program on the CPU internal
RAM.
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