Read Sharp ER-A750 (serv.man4) Service Manual online
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
Click on the first or last page to see other ER-A750 (serv.man4) service manuals if exist.