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LQ-2180, Revision A, Troubleshooting, Repairing the C272MAIN Board - lq printing problems

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LQ-2180 Table 5-3. Repairing the C272MAIN Board (2/3) Problem Cause Checkpoint Solution Check the oscillator signal at pins 26 or 27 of the CRU1. The printer does CRU1 is not operate at all. defective. If the signal is not correct, replace IC4 (or replace the main board). Otherwise, replace CRU1. Carriage operation is abnormal. IC11 or IC4 is defective. Check input signal waveform (CH1) at pins 1, 2, 3, and 4 of IC4. Check output signal waveform at pins 8, 1, 18, and 11 of IC11. If the input signal is not correct, replace IC4 (or replace the main board). If the output signal is not correct, replace IC11. IC3 is defective. Check the output signal at pins 68, 69, 70, and 71 of IC3. If there is no output signal, replace IC3. Revision A Table 5-4. Repairing the C272MAIN Board (3/3) Problem Cause Paper feed is abnormal. IC1 is defective. IC3 is defective. IC2 is defective. Checkpoint Solution • Check input signal waveform at pins 1, 2, 23, and 24 of IC2. • Check output signal waveform at pins 6, 3, 18, and 21 of IC12. If the input signal is not correct, replace IC3. If the input signal is correct and the output signal is not correct, replace the IC12. • Check the output signal waveform at pin 111 of IC3. No data is printed., IC3 is defective., If this signal is not output, replace IC3. A particular dot fails to print., IC3 is defective or one of the head drive transistors is defective (Q4 Q27). • Check the voltage waveform at pin HD1 - HD24 of IC3. • Check the voltage waveform (CH2) for each transistor. If the head drive signal is not output, replace IC3. If the head drive signal is output, replace the head drive transistor. Troubleshooting Repairing the C272MAIN Board 42

Section	Page
LP-2180	1
Product Description	7
1.1 Specifications	8
1.1.1 Features	8
1.1.2 Accessories	8
Table 11. Items Included in the Printer	8
Table 12. Items Included in the Printer	8
Table 13. Items Included in the Printer	8
1.1.3 Printing Specifications	9
Table 14. Print Speed and Corresponding Printable Columns	9
1.1.4 Paper Handling	9
Table 15. Release Lever Settings	10
Table 16. Adjust Lever Setting Position	10
1.1.5 Paper Specifications	11
Table 17. Cut Sheet	11
Table 18. Cut Sheet (Multi Part)	11
Table 19. Card	12
Table 110. Envelope	12
Table 111. Continuous Paper (Single sheet and Multi Part)	13
Table 112. Continuous Paper with Labels	13
Figure 11. Printable Area - Label	13
Table 113. Roll Paper	14
1.1.6 Electrical Specifications	15
1.1.7 Reliability	15
1.1.8 Safety Approvals	15
1.1.9 CE Marking	15
1.2 Firmware Specifications	16
1.2.1 Control Codes and Fonts	16
Table 114. Character Tables and Available Typefaces	17
1.2.2 Interface Specifications	18
1.2.2.1 Parallel Interface (Forward Channel)	18
1.2.2.2 Parallel Interface (Reverse Channel)	18
1.3 Operation Instruction	19
1.3.1 Control Panel	19
Figure 12. Control Panel	19
Table 115. Operations at Power On	19
1.3.2 Bi-directional Adjustment Function	19
1. Bi-directional adjustment for draft mode	19
2. Bi-directional adjustment for draft copy mode	19
3. Bi-directional adjustment for LQ mode	19
1.3.3 EEPROM Initialization	20
Table 116. Initialization Area for EEPROM (1/2)	20
Table 117. Initialization Area for EERPOM (2/2)	20
1.4 Main Components	21
Operating Principles	24
2.1 Control Circuit	25
2.1.1 Overview of the Control Circuit Operation	25
Figure 21. Control Circuit Block Diagram	25
Figure 22. Data Flow	25
Table 21. Functions of the Main Board	26
2.1.2 System Reset Circuit	26
Figure 23. Reset Circuit	26
2.1.3 Printhead Driver Circuit	27
Figure 24. Printhead Drive Circuit	27
2.1.4 CR Motor Driver Circuit	28
Figure 25. CR Motor Driver Circuit	28
2.1.5 PF Motor Driver Circuit	28
Figure 26. PF Motor Driver Circuit	28
2.1.6 EEPROM Control Circuit	29
2.1.7 Sensor Circuit	29
Figure 27. EEPROM Control Circuit	29
Figure 28. Sensor Circuit	29
Disassembly and Assembly	30
Adjustment	32
4.1 Overview	33
4.1.1 Pre-operation for the Adjustment Program	33
1. Get a continuous paper. (136-column paper should be used to avoid printing on the platen.)	33
2. Set the release lever to the continuous paper position.	33
3. Connect the printer and the PC and turn the printer on.	33
4. Press the Load/Eject button to send the paper to the stand-by position. Then press the LF/FF b...	33
5. Double-click “LQSERIES.EXE”. The program starts up and the screen below appears.	33
Figure 41. LQSERIES.EXE Initial Screen	33
6. Move the cursor to “LQ-2180” and press the Enter key.	33
7. The following screen appears.	33
Figure 42. Destination Selection Screen	34
8. Check the printer to be adjusted for the destination; NLSP or Standard, then select the destin...	34
9. The following screen appears.	34
Figure 43. Main Menu Selection Screen	34
10. Select “Perform”. The following screen appears.	34
Figure 44. Main Menu Screen	34
4.1.2 Bi-D Adjustment	35
1. Perform the pre-operation. (See Section 4.1.1.)	35
2. Select “1. Bi-D Adjustment”. The following screen appears.	35
Figure 45. Initial Menu of the Bi-D Adjustment	35
3. Press the Space key to check the current Bi-D setting condition for the High speed draft mode....	35
Figure 46. Bi-D Pattern Sample	35
4. Output the patterns for the Draft Copy Mode and the LQ Mode, the rest of the three modes in th...	35
5. Examine the patterns for the three modes output in the previous steps, and correct the value i...	35
6. When this adjustment is completed, if you need to perform another adjustment using this progra...	36
4.1.3 TPE Level Reset	36
1. Perform the pre-operation. (See Section 4.1.1.)	36
2. Select “TPE Reset” in the main menu screen (Figure 44) and press the Enter key. The screen be...	36
Figure 47. Screen - TPE Reset	36
3. Select “Yes” and press the Enter key. FF is written in EEPROM when the printer power is turned...	36
4.1.4 Writing the User-characteristic Data	37
1. Perform the pre-operation. (See Section 4.1.1.)	37
2. Select “Set or Reply Starting Date” and press the Enter key. The screen below appears.	37
Figure 48. Screen - Set or Reply Starting Date	37
3. Select “Characteristic Status Code” and press the Enter key. The following screen appears.	37
Figure 49. Screen - Characteristic Status Code	37
4. Select “Set Starting year / month / date” and press the Enter key. The following screen appears.	37
Figure 410. Screen - Setting Starting Year / Month / Date	38
5. Input a 6-digit data. Be sure to input it correctly since this programs does not perform compa...	38
Troubleshooting	39
5.1 Overview	40
5.2 Troubleshooting Information	40
5.2.1 Printhead	40
5.2.2 Sensors	40
Table 51. Sensor Test Points	40
5.2.3 Motors	40
5.2.4 Error Codes with Indicators and Buzzer	40
5.3 Unit Level Troubleshooting	41
5.4 Repairing the C165 PSB/PSE Board	41
5.5 Repairing the C272MAIN Board	41
Table 52. Repairing the C272MAIN Board (1/3)	41
Table 53. Repairing the C272MAIN Board (2/3)	42
Table 54. Repairing the C272MAIN Board (3/3)	42
5.6 Repairing the Printer Mechanism	43
Maintenance	44
Appendix	46
7.1 EEPROM Address Map	47
Table 71. EEPROM Address Map (1/7)	47
0: PC437	47
1: PC850	47
2: PC860	47
3: PC863	47
4: PC865	47
5: PC861	47
6: BRASCII	47
7: Abicomp	47
8: ISO Latin 1	47
9: Roman 8	47
10: PC437 Greek	47
11: PC852	47
12: PC853	47
13: PC855	47
14: PC857	47
15: PC864	47
16: PC866	47
17: PC869	47
18: ISO Latin 1T	47
19: ISO 8859-7	47
20: MAZOWIA	47
21: Code MJK	47
22: Bulgaria	47
23: Estonia	47
24: PC774	47
25: ISO 8859-2	47
26: PC866 LAT	47
27: PC866 UKR	47
28: Hebrew 7	47
29: Hebrew 8	47
30: PC862	47
31: PCAPTEC	47
32: PC708	47
33: PC720	47
34: PCAR864	47
35: PC858	47
36: ISO 8859-15	47
37: Italic U.S.A.	47
38: Italic France	47
39: Italic Germany I	47
40: Italic U.K.	47
41: Italic Denmark	47
42: Italic Sweden	47
43: Italic Italy	47
44: Italic Spain	47
Table 72. EEPROM Address Map (2/7)	47
0: Roman	47
1: Draft	47
2: Sans serif	47
3: Courier	47
4: Prestige	47
5: Script	47
6: Others (the default)	47
Table 73. EEPROM Address Map (3/7)	48
0: 10 cpi	48
1: 12 cpi	48
2: 15 cpi	48
3: 17 cpi	48
4: 20 cpi	48
5: Proportional	48
0: Bi-d.	48
1: Uni-d.	48
2: Auto	48
0: Auto I/F selection	48
1: Parallel I/F	48
2: Type-B I/F	48
b0: Auto line feed 0: Off, 1: On	48
b1: Auto tear off 0: Off, 1: On	48
b2: Skip over perforation 0: Off, 1: On	48
b3: High speed draft 0: On, 1: Off	48
b4: Input buffer 0: On, 1: Off	48
b5: (reserved)	48
b6: (reserved)	48
b7: (reserved)	48
Table 74. EEPROM Address Map (4/7)	48
b0: Software 0: ESC/P2, 1: IBM 2391 Plus	48
b1: 0 slash, 0: Off, 1: On	48
b2: Buzzer 0: On, 1: Off	48
b3: Roll paper 0: Off, 1: On	48
b4: Auto CR (IBM) 0: Off, 1: On	48
b5: A. G. M. (IBM) 0: Off, 1: On	48
b6: (reserved)	48
b7: (reserved)	48
0: Roman	48
1: Sans Serif H	48
2: OCR-B	48
3: Orator	48
4: Orator-S	48
5: Script C	48
0: Friction Bin 1 or Tractor not Tear off	48
1: Friction Bin 1	48
2: Friction Bin 2	48
3: Friction Card	48
4: Tractor & Tear off	48
Table 75. EEPROM Address Map (5/7)	49
b0: LOAD function	49
b1: EJECT function	49
b2: FONT selection	49
b3: PITCH selection	49
b4: TEAR OFF function	49
b5: BIN selection	49
b6: Draft self test	49
b7: LQ self test	49
b0: LF function	49
b1: FF function	49
b2: Micro Adjust function	49
b3: Pause function	49
b4: Data dump	49
b5: Default setting	49
b6: Bi-d. adjustment	49
b7: (reserved)	49
0: Off	49
1: On	49
Table 76. EEPROM Address Map (6/7)	49
b0: black paper mode 0: Off, 1: On	49
b1: paper width measure 0: On, 1: Off	49
b2: b2 to b7: (reserved)	49
Table 77. EEPROM Address Map (7/7)	50
0: Standard version	50
1: NLSP version	50
0: Table2	50
1: Table1	50
7.2 Connector Summary	51
Figure 71. Cable Connections	51
Table 78. C272 Main Board Connection	51
Figure 72. Connector Pin Assignment (Changed/new items only)	52
1: A	52
2: B	52
3: -A	52
4: -B	52
5: HOLD	52
6: +5V	52
7: GND	52
8: GND	52
9: +35V	52
10: +35V	52
1: +35V	52
2: +5V	52
3: HOLD	52
4: +35V	52
5: -A	52
6: B	52
7: GND	52
8: GND	52
9: A	52
10: -B	52
1: RELEASE 1	52
2: GND	52
3: RELEASE 2	52
4: GND	52
1: RELEASE 1	52
2: GND	52
1: RELEASE 2	52
2: GND	52
1: PE	52
2: GND	52
7.3 Component Layout	53
Figure 73. C272Main Component Layout - Component Side	53
Figure 74. C272Main Component Layout - Soldering Side	54

Match case Limit results 1 per page

LQ-2180

Revision A

Troubleshooting

Repairing the C272MAIN Board

Table 5-3.

Repairing the C272MAIN Board (2/3)

Table 5-4.

Repairing the C272MAIN Board (3/3)

Problem

Cause

Checkpoint

Solution

The printer does

not operate at all.

CRU1 is

defective.

Check the oscillator signal at

pins 26 or 27 of the CRU1.

If the signal is

not correct,

replace IC4 (or

replace the main

board).

Otherwise,

replace CRU1.

Carriage operation

is abnormal.

IC11 or IC4 is

defective.

Check input signal waveform

(CH1) at pins 1, 2, 3, and 4 of

IC4. Check output signal

waveform at pins 8, 1, 18,

and 11 of IC11.

If the input

signal is not

correct, replace

IC4 (or replace

the main board).

If the output

signal is not

correct, replace

IC11.

IC3 is

defective.

Check the output signal at

pins 68, 69, 70, and 71 of

IC3.

If there is no

output signal,

replace IC3.

Problem

Cause

Checkpoint

Solution

Paper feed is

abnormal.

IC1 is

defective.

IC3 is

defective.

IC2 is

defective.

•

Check input signal waveform

at pins 1, 2, 23, and 24 of IC2.

•

Check output signal waveform

at pins 6, 3, 18, and 21 of

IC12.

If the input

signal is not

correct, replace

IC3. If the input

signal is correct

and the output

signal is not

correct, replace

the IC12.

No data is

printed.,

IC3 is

defective.,

•

Check the output signal

waveform at pin 111 of IC3.

If this signal is

not output,

replace IC3.

A particular

dot fails to

print.,

IC3 is

defective or

one of the head

drive

transistors is

defective (Q4 -

Q27).

•

Check the voltage waveform

at pin HD1 - HD24 of IC3.

•

Check the voltage waveform

(CH2) for each transistor.

If the head drive

signal is not

output, replace

IC3. If the head

drive signal is

output, replace

the head drive

transistor.