Sharp ER-A750 Service Manual page 63

15-2. MRS, SRV reset
The ER-A750 does not have the mode switch. The procedure for
resetting MRS, SRV is different from that of conventional cash regis-
ters.
in the ER-A750, MRS, SRV resetting is selected and executed by the
key which has bee depressed when the CKDC reset is released to
start the system.
(In the case of MRS, security is added by a key operation equivalent
to a pass word.)
Procedure
1 POWER OFF
2 Slide CKDC reset switch to reset position (slide switch)
3 POWER ON
4 Slide CKDC reset switch to normal position.
At this time,
•
if no key is pressed, go to step 5
•
if a specified key is pressed, go to step 6.
5 Perform program reset (SRV reset).
6 The machine waits for secret key input. Enter 4 kinds of secret
keys before master resetting (secret key positions are fixed).
Which type of master reset should be performed at this time
(MRS1 or MRS2) is determined by the key which was pressed in
step 4.
If the secret key input is wrong, reset the program. (The secret
key input is like a pass word, to prevent the user from master
resetting inadvertently.)
Flow chart
Start
CKDC start
condition read
No
Hard reset
start?
Yes
*Slide Switch
operation
MRS1 key
ON?
Yes
Secret key
judgement
No
OK?
Yes
SRV reset
MRV reset
No
Normal
start?
SRV reset
Yes
Recovery
No
MRS2 key
ON?
Yes
Secret key
judgement
No
OK?
Yes
10-key position SRV reset
input sequence
MRV reset
Fig. 16
16. Drawer
The ER-A750 can use up to 2 optional external drawers.
16-1. Drawer solenoid drive
P34 P37 inside the CPU are allocated for the port output of the
drawer solenoid drive.
Built-in port Signal name
P34
P35
P36
P37
One port corresponds to one drawer. Theoretically, it is possible to
drive multiple drawers at the same time, but this processing must be
inhibited softwarewisely because of power supply capacity and
driver hardware factors. If a power failure is detected, the drawer
solenoid drive must be stopped as soon as possible.
* The drawer solenoid drive time must controlled in the range of 40
ms to 50 ms by the timer.
16-2. Drawer open/close sense
The drawer open/close sense signal is input into the built-in port of
the CPU. the sense signal of an optional drawer sensor is also wired
ORed before inputting.
•
P33=1: Any of the drawers is open.
7 – 33
Table 22
Remarks
DR0 Drawer 1 (optional drawer)
DR1 Drawer 2 (optional drawer)
DR2 Reserved
DR3 Reserved