Sharp ER-1910 Service Manual page 12

8) Test No.8: RAM test
@) Key operation
13 ~-[TLlor[GAAT]
(2) Description
Though read/write test is conducted from the address 4000H
to 5FFFH, the data are secured as they are saved before the
test started.
(3) Test results Termination print
At normal end — ae ee ee, ee oe 13, Ly
Error — fei tes ch Se ip Os
9) Test No.9: Key position code read test
CG) Key operation
14 —>[TLor[CA/AT|
@) Description eS ere
Key position of a key on the eeveoard is displayed when any
'key is depressed. (Hardware key contacts code)
The receipt ie ne keys only feed paper without: displaying,
~vand the | CA/AT | key is used to terminate the test.
For key seahion ass displayed, refer to Fig.7-1 to 7-5.
(3) Termination
Push the [TL] or [CA/AT] key.
Termination print 14
10) Test No.10: System clock test
@) Key operation
15 —[TLlor[CA/AT]
() Description
Used for the adjustment of the KDC (uPD7505C) system clock.
An 880 to 900us pulse is generated from P21 (pin 30) of the
KDC. The display becomes blanking.
For detail of adjustment, refer to the paragraph Clecuesing
circuit description.
(3) Termination
Set the mode switch to the PGM side.
Termination print 15
11) Test No.11: Counter clock test
@) Key operation
16 —[TL]or[CA/AT|
@) Description
_ For error adjustment, a 2048Hz pulse is issued from P21 (pin
3) of the KDC (uPD7507C). The display goes blank.
This test is for the factory adjustment only.
(3) Termination
Set the mode switch to the PGM side.
Termination print 16
12) Test No.12: Sequential test-1
G) Key operation
00 > [TL]or[CAVAT|
Refer to 2) test No.2 for the sum check data.
x x x x
@) Description
Within one second after the key operation, the test nos 1 thru
8, are able to carry out continuously.
NOTE-1: If a drawer sensor is equipped for test NO.5, the
control proceeds to a next step when the drawer is
closed after it was opened. If the sensor is not
equipped, the control jumps to a next step assuming
it has no drawer is installed.
NOTE-2: Simple print is done for the continuous print test of
test No.6.
NOTE-3: An error is always evoked, if the 27128 SOS ROM
is not mounted or 27256 SOS ROM is mounted at
test No.7-12.
ER= 2395
00-00-00
01 — —t-cierk and mode switch test.
091 60 2 Key switch test,
03. display test
04 ——Receipt switch test
05 —t—prawer test
—-*
O23 NTL
——Printtest
| 1 -ROM sum check
vee e-12E oar |
1 > == RAM sum check
0-00 | .
000-0002E
YOUR RECEIPT
——seren
THANK YOU
* The upper four digits shows the sum of key position codes
which have been pressed in the key switch test.
Fig. 7-9
@) Termination
Ailtests automatically terminate upon finishing the stamp test.
13) Test No.13: Sequential test-2
@) Key operation
x x x
20 -+[TLJorlOw/AT]
Refer to 2) test No.2 for the sum check data.
(2) Description |
It is similar as the test No.12 except that it ignores the drawer —
open sensor of the test No.5.