Sharp ER-A750 (serv.man4) Service Manual ▷ View online
PWB marking
Packing case
2) Cautions to be exercised when using the RAM
PWBs with the ER-A750
When using the above-mentioned RAM PWB version (1) with the
ER-A750, it is necessary to correct the RAM access timing. Use of
the above-mentioned RAM PWB version (2) does not require the
correction of the RAM access timing. For this purpose, a hardware
jumper (JP1), designed to judge to determine whether or not to cor-
rect the RAM access timing, is located on the main PWB of the
ER-A750 (Fig. 2). Before installing an optional RAM PWB, check its
version by referring to the description given in the above-mentioned
(1) and (2) and set the jumper as shown below. (The ER-A750 has
been factory-set for 150ns access time and TP cycle inserted.)
ER-A750, it is necessary to correct the RAM access timing. Use of
the above-mentioned RAM PWB version (2) does not require the
correction of the RAM access timing. For this purpose, a hardware
jumper (JP1), designed to judge to determine whether or not to cor-
rect the RAM access timing, is located on the main PWB of the
ER-A750 (Fig. 2). Before installing an optional RAM PWB, check its
version by referring to the description given in the above-mentioned
(1) and (2) and set the jumper as shown below. (The ER-A750 has
been factory-set for 150ns access time and TP cycle inserted.)
Fig. 3 Setting of the JP1 on the main PWB of the ER-A750
(1)
Setting when the ER-03MB or the ER-04MB is not marked with
"
"
|
"
(Position to which the ER-A750 has been factory-set)
(2)
Setting when the ER-03MB or the ER-04MB is marked with "
|
"
(ER-03MB/04MB PWB Face side)
Imprint " " on this white area.
CE
Imprint " " on the right side of the
model rabel.
model rabel.
Indivi dual case
E
C
Imprint " " under the model label.
Colleclive case
E
C
B
3
2
1
MAIN PWB
+C
17
Q6
IC
27
1
3
JP1
ZD
4
1
IC
16
Short position
IN case of (1)
IN case of (2)
1
3
1
3
3 – 3
3) Difference in operation according to the setting
of the jumper
Only when the ER-03MB or the ER-04MB is used in the above setting
state (1) will one cycle (i.e., cycle for generating pre-charge time of
the quasi-SRAM: TP cycle) of access be additionally inserted into the
CPU, thereby delaying the CPU speed slightly.
state (1) will one cycle (i.e., cycle for generating pre-charge time of
the quasi-SRAM: TP cycle) of access be additionally inserted into the
CPU, thereby delaying the CPU speed slightly.
4) Factory-setting of the ER-A750
The ER-A750 has been factory-set so that the JP1 is in the setting
state (1) (TP cycle inserted). However, if it has neither the ER-03MB
or the ER-04MB installed to it, this is automatically detected by soft-
ware, so the additional insertion of the TP cycle is not performed.
state (1) (TP cycle inserted). However, if it has neither the ER-03MB
or the ER-04MB installed to it, this is automatically detected by soft-
ware, so the additional insertion of the TP cycle is not performed.
Note:
When installing the ER-03MB or the ER-04MB, check the position
of the jumper by referring to Fig. 3.
Improper setting of the jumper may result in malfunction.
When installing the ER-03MB or the ER-04MB, check the position
of the jumper by referring to Fig. 3.
Improper setting of the jumper may result in malfunction.
4. IR module (PRM-850) soldering
conditions
When replacing the IR module (IC1), observe the following conditions.
Solder the IR module with the solder tip temperature at 280 degrees
C within 3 sec.
C within 3 sec.
5. IPL (Initial Program Loading) function
1) Introduction
The application software of the ER-A750 is written in the flash ROM
(IC6: VHILH80S01-1). In the following cases, writing procedure of the
application software into the flash ROM is required:
(IC6: VHILH80S01-1). In the following cases, writing procedure of the
application software into the flash ROM is required:
•
When the flash ROM (IC6: VHILH80S01-1) is replaced with new
one. The service part flash ROM does not include the application
software in it.
one. The service part flash ROM does not include the application
software in it.
•
When IPL writing is required because of change in the application
software.
software.
*
The service part of the main PWB unit (CPWBX7510BH01) in-
cludes the flash ROM (IC6: VHILH80S01-1) with the application
software written in it, and there is no need for writing the applica-
tion software when replacing the main PWB unit.
cludes the flash ROM (IC6: VHILH80S01-1) with the application
software written in it, and there is no need for writing the applica-
tion software when replacing the main PWB unit.
2) IPL procedure
There are two ways of IPL procedures.
•
IPL from P-ROM via ER-A7RS
•
IPL from PC via IR (infrared) communication
The detailed descriptions on the above procedures are given below.
3) IPL from P-ROM via ER-A7RS
(1)
Install the master ROM to the IC socket (IC12) on the ER-A7RS.
Master ROM: Part code: VHI27801RAA1A
(2)
IPL switch on the ER-A7RS: Set the IPL SW to ON position.
(3)
Install the ER-A7RS to the ER-A750. (The ER-A750 power
should be turned OFF.)
should be turned OFF.)
(4)
Turn on the power of the ER-A750.
(5)
The following display is shown and the IPL procedure is started.
When the procedure is completed, the message of "Completed."
is shown.
is shown.
LCD DISPLAY
IPL from PROM
C0 C1 C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD
CE CF
Completed.
Main PWB
Location No.IC1
Part code: VHIRPM850CB-1
Part code: VHIRPM850CB-1
P-ROM
IC12
IPL SW
OFF
ON
ER-A7RS
ER-A750
(SIDE VIEW)
(SIDE VIEW)
3 – 4
(6)
Turn off the power of the ER-A750.
(7)
Remove the ER-A7RS from the ER-A750.
(8)
Perform the master reset. (Refer to CHAPTER 4.)
4) IPL from PC via IR (infrared) communication
(1)
IR communication between the ER-A750 and PC is as follows:
(2)
Procedures on the PC side and on the ER-A750 side are as
follows:
RS-232C
CE-IR4
PC
without IR
without IR
ER-A750
ER-A750
PC with IR
1. PC+CE-IR4 system
2. PC only system
No
Procedure on P.C. side
No
Procedure on ER-A750 side
1
Copy “A7IPL.EXE” and S-type ROM object file
(ex. “A750_0A.ROM) into your Personal Computer (P.C.).
(ex. “A750_0A.ROM) into your Personal Computer (P.C.).
*
“A7IPL.EXE” and S-type ROM object file is separately
supplied.
supplied.
2
Turn OFF the power.
3
Select IPL Receiving Mode.
Set IPL switch “ON”.
1
Open the IR cover of the ER-A750.
2
IPL switch: Set the IPLIR SW to the left side when
viewed from the front.
viewed from the front.
4
Turn ON the power.
5
Starting of IPL Receiving Mode.
ER-A750 shows
“IPL from IR”
IPL from IR
6
Connect P.C. and ER-A750 via IR.
ER-A750
(SIDE VIEW)
(SIDE VIEW)
IR unit
IPLIR SW
IPLIR SW
3 – 5
7
Execute “A7IPL.EXE” on P.C.
Operation:
>A7IPL A750_0A.ROM
(“A750_0A.ROM” is file name of S-type ROM object.)
8
Program data is sent to ER-A750 automatically.
8
Program data is received from P.C. automatically.
IPL from IR
Connected IRDA 115200
C1 C2 C3 C4 C5 C6 C7 C8
C9 CA CB CC CD CE CF
Connected IRDA 115200
C1 C2 C3 C4 C5 C6 C7 C8
C9 CA CB CC CD CE CF
9
“A7IPL.EXE” is completed.
9
P.C. shows
ER-A750 shows
“Completed.”
“Completed.”
IPL from IR
Connected IRDA 115200
C1 C2 C3 C4 C5 C6 C7 C8
C9 CA CB CC CD CE CF
Completed.
Connected IRDA 115200
C1 C2 C3 C4 C5 C6 C7 C8
C9 CA CB CC CD CE CF
Completed.
10
Turn OFF the power.
11
Select Normal Mode.
Set IPL switch “OFF”.
12
Execute “Master reset” on ER-A750.
End
3 – 6
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