TECHNICAL GUIDE
INDEX
ELECTRONIC CASH REGISTER
TROUBLE SHOOTING GUIDE
230ER
HARD KEY CODE TABLE (230ER)
The HARD KEY CODE TABLE which written in our service manual is for 190ER.
230ER table is as follows;
FEED 34 37 7 8 9 16 20 24 27
30 33 36 4 5 6 15 19 23 26
29 32 35 1 2 3 14 18 22 25
28 31 C 0 10 11 13 17 21
1. 230ER
Checking flowchart
Mode switch ON
ECR is working OK?
No
Power supply and PWD signal are OK? See A (Page 2)
Yes
Printer initialization is OK? See B (Page 3)
Yes
Display 0.00 is OK? See C (Page 4)
Yes
Key input is OK? See D (Page 6)
Yes
Transaction is OK? See E (Page7)
Yes
Receipt printing is OK? See F (Page8)
Yes
Drawer is open? See G (Page 8)
No
No
No
No
No
No
No
- 1 -
A. Power supply and PWD signal problem
Does the 27 V (AC) appear at secondary side of transformer?
Yes
Does the 25.6 V (DC) appear at the collector of transistor Q2?
Yes
Transistor Q2 and Q3 are OK?
(These parts are making Vp voltage for printer)
Yes
Does the PWD signal become "L" level?
(Collector of transistor Q10)
Yes
Is the regulator IC (IC1) working?
Input pin no.1 : DC 25.6 V
Outout Pin no.2 : DC 5.6 V
No
Replace IC1 (LM2575T-5.0/LB03)
Regurator IC
This IC has a feedback function.
When feedback terminal (pin no.4) detects voltage down, IC outputs more voltage
(more than 5 V).
In this circuit, feedback therminal gets less voltage level than output level
because there are voltage drop through the diode D8( about 0.6V).
Thus, output voltage become more than 5 volts. (about 5.6 V)
- 2 -
B. Printer problem
Motor problem (does not rotete)
No
Does the motor signal come out from CPU (pin no.43)? Repalce CPU
Yes
Does the transistor Q19 become ON? Replce Transistor Q19
Yes
Does the transistor Q9 become ON? Replace transistor Q9
Yes
Replace the motor unit
motor stop ON ON OFF OFF
Motor rotate ON ON ON ON
"L" to "H"
No
No
Transistor status
Q20 Q21 Q19 Q9
Timing signal (TP)
No
Does the TP signal come out from printer unit? Replace printer unit
Yes
Replace CPU
- 3 -
C. Display problem
Degit missing
Does the voltage common signal come to display LED?
(COM0,1,2,3 : about 5 V)
No
Does the degit signal come out from CPU?
Yes
COM0 : Pin no.41 of CPU ( Checking point : Base of transistor Q14)
COM1 : Pin no.40 of CPU ( Checking point : Base of transistor Q18)
COM2 : Pin no.39 of CPU ( Checking point : Base of transistor Q17)
COM3 : Pin no.38 of CPU ( Checking point : Base of transistor Q16)
Digital transistors (Q14,Q16,Q18,Q17) are OK?
Yes
Transistors (Q8,Q5,Q6,Q7) are OK?
Yes
Replace Display LED
Yes
Replace display LED
Segment missing
Does the segment signal come to display LED?
(SA0 ~ SG0, SA1 ~ SG1)
No
Does the segment signal come out from CPU?
( Pin no.21 ~ 31, Pin No.33 ~ 37 )
Yes
Does the segment signal come out from IC2 or IC3?
Yes
Replace display LED
COM0
COM1
COM2
COM3
SA1 ~ SG1
SA0 ~ SG0
SDP0
- 4 -
Display LED pin asignment
Display problem sample
8 8 8 8 8 8 8 8 SD0 signal missing
8 8 8 8 8 8 COM1 signal missing
8 8 8 8 8 8 8 Display LED broken
Notice of display LED
CE-2300 is using 2 type of display LED. Itsdifference is brightness.
When you replace LED for repair, use same type.
H type LED is a little bit brighter than G type.
- 5 -
D. Key input proble
Does the key common signal (KC0~ KC3) come out from CPU?
No
Replace CPU KC3 : Pin no.38
1
Does the key input signal (Ki0 ~ Ki9) come to CPU?
Yes
Replace CPU
KC0 : Pin no.41
KC1 : Pin no.40
KC2 : Pin no.39
Keyboard
KC0 ~KC3
CPU
Ki0 ~ Ki9
When a key is pressed , keyinput signal coming to CPU.
Key contact table
KC3
KC2
KC1
KC0
KI7 KI8 KI9 KI0 KI1 KI2 KI3 KI4 KI5 KI6
- 6 -
Mode key selection
CPU knows mode switch position according to difference of voltage lebel
at pin no.1.
CPU
1
OFF
1.7
3.2
4.2 0.9
E. Transaction problem
Data can not saving
Check the address bus and data bus at RAM chip.
In case you find NG signal , there is a damage either PCB (open/short circuit) or RAM chip.
Good signal waveform
5 V
GND
NG signal wave form
5 V
GND
5 V
GND
- 7 -
F. Receipt printing problem
Intermittent printing
Digit
Which is the problem, digit missing or nothing print? 1
Nothing
Does the HD COM signal come out from CPU?
Yes
Does the transistor Q22 become ON?
Yes
Does the transistor Q23 become ON?
Yes
Replace printer unit
1
What digit is missing? HD1 ~HD12
Does the HD signal come out from CPU?
Yes
Does the HD signal come out from IC7 or IC8?
Yes
Replace printer unit
G. Drawer problem (not open)
Does the drawer signal coume out from pin no.64 of CPU?
Yes
Does the transistor Q13 become ON?
Yes
Does the transistor Q12 become ON?
Yes
Replace lock ass'y of drawer.
5 V
GND
- 8 -
Loading...