Read Sharp UP-800 (serv.man23) Service Manual online
UP-820N/820F (V)
MASTER RESET
4 – 1
CHAPTER 4. MASTER RESET
1. MASTER RESET (ALL MEMORY CLEAR)
[MRS1 key & MRS2 key]
Position of MRS1 & MRS2 key is as follows.
MRS1 key : The key located on left upper corner. (B key)
MRS2 key : The key located on right upper corner. (A and B key)
Key board layout
[Secret key operation]
This operation is used as password of MRS operation.
Following key sequence have to enter after operate reset switch.
Following key sequence have to enter after operate reset switch.
If you operate wrong sequence then program reset is performed.
a : The key located on right upper corner.
b : The key located on left lower corner. (Flat keyboard)
b’: The key located on left lower corner. (Normal keyboard)
b’: The key located on left lower corner. (Normal keyboard)
c : The key located on left upper corner.
d : The key located on right lower corner.
• a
3b3c3d
Key board layout
Master resetting 1 and 2 can be accomplished by using the following
procedures.
procedures.
*Meaning of reset switch “ON” & “OFF” positions are as follows.
ON position : The position that CKDC becomes active state
(Normal status.)
OFF position: The position that CKDC becomes reset state
(Reset status)
There are two possible methods to perform a master reset.
• MRS-1
Procedure :
Clears the entire memory and resumes initial values.
1) Set the reset switch to OFF position and turn-on the machine.
2) Press and hold the MRS1 key and the reset switch move to ON
position.
3) And then, enter the secret key operation.
• 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.)
Procedure :
1) Set the reset switch to OFF position and turn-on the machine.
2) Press and hold the MRS2 key and the reset switch move to ON
position.
3) And then, enter the secret key operation.
Program the 0 to 9 keys, 00 key, 000 key, decimal point key, CL key, X
key, SBTL key, MODE key, cursor keys, HOME key, and CANCEL key
and ENTER key and TL key in this sequence.
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.)
key.)
To inhibit a particular key, press the 0 key at the point when that key
should be programmed.
2. PROGRAM RESETTING (INITIALIZATION)
Set the reset switch to OFF position and turn-on the machine.
And the reset switch move to ON position without any key pressing.
And the reset switch move to ON position without any key pressing.
This resetting resumes the initial program without clearing memory.
A
B
c
b
b'
d
a
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