SHARP ER-A770 Service Manual
POS TERMINAL
MODEL ER-A770
(For "U"&"A" version)
CONTENTS
1. Removing the rear cover......................................................................................... 2
2. Replacing the rear cover......................................................................................... 2
3. Removing the top cabinet ....................................................................................... 2
4. Replacing the top cabinet........................................................................................3
5. Removing the Noise filter PWB, Transformer and AC cord .................................... 3
6. Replacing the Noise filter PWB and Transformer.................................................... 3
7. Removing and replacing the keyboard unit............................................................. 3
8. Removing and replacing the LCD unit..................................................................... 4
9. Expansion RAM Board : UP-P02MB2..................................................................... 4
10. RS232 I/F: ER-A7RS .............................................................................................. 4
11. MCR unit: UP-E12MR............................................................................................. 5
12. Drawer box unit: ER-03DW/04DW..........................................................................5
13. Customer display: UP-I16DP..................................................................................5
14. Remote display: UP-P16DP....................................................................................6
15. How to extend display pole: UP-P16DP.................................................................. 7
16. SRN I/F: Standard................................................................................................... 8
17. RS232 I/F: Standard ............................................................................................... 8
Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.
SHARP CORPORATION
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
Symbol/PartsCod)
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Example of wiring for all optional devices connected to the system unit.
ERA-7RS (RS232) cable
RS232 cable
UP-P16DP cable
Drawer cable
Inline cable
Drawer earth cable
AC cord
Precautions
• Before installation, be sure to disconnect the AC power.
• Use gloves to protect your hands from being cut by the angle
and the chassis.
• Connect all the cables securely. When connecting or
disconnecting the cables, be careful not t o apply st ress to t he
cables. (It may cause disconnection.)
• Ground the human body to eliminate static electricity. When
assembling the LCD, use a discharge blower to prevent the
introduction of dust.
• Be careful when working near the high voltage transformer.
• Cable between the main PWB and the LCD: (CN10)
• Cable between the main PWB and the CKDC PWB:
(CN8)
e) Remove the earth wire
A
and .
1. Removing the rear cover
1) Remove the two screws fixed on the lower cabinet.
2) Remove the rear cover
.
2
Fig. 1
1
B
1
Fig. 2
5
1
C
2. Replacing the rear cover
Install the rear cover in the reverse order of removing.
3. Removing the top cabinet
1) Remove the two screws fixed on the lower cabinet.
2) Remove the top cabinet.
a) Lift the rear edge of the top cabinet in the direction of arrow
b) Slide the top cabinet in the direction of arrow
three pawls of the bottom cabinet at the same time. (Be care-
ful not to break the pawls.)
c) Lift the top cabinet and put it straight in the direction of arrow
.
(Be careful not to pull the cable between the top cabinet
and the main PWB.)
d) Pull and remove the following cables between the top cabinet
and the main PWB.
• Cable between the main PWB and the invertor PWB:
(CN13)
and remove
3
.
Fig. 3
6
2
4
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