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System Control Reading of Keys, 4-4-2. Reading of Function Switches

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4-4. System Control Section The system control section mainly consists of a microcomputer (IC304) and performs the following processing. 4-4-1. Reading of Keys IC304 monitors the PRINT, OPEN/CLOSE, COPY, FEED, and REMOTE keys on the door panel. Each key is activated when the falling edge of a signal is detected. IC304 73pin 74pin 75pin 76pin Signal name nDOOR_KEY nPRINT_KEY nCOPY_KEY nFEED_KEY 4-4-2. Reading of Function Switches IC304 monitors the setting of a front slide switch, inner slide switches, and a rear DIP switch and reflects its setting on the operation. Front slide switch (on the front panel) IC304 80pin Function POSI/NEGA 1pin STANDERD/SIDE 79pin PRINT SIZE Operation L: NEGA H: POSI L: STANDARD H: SIDE 0.00 V: SMALL 1.25 V: NORMAL 2.50 V: ZOOM1 3.75 V: ZOOM2 5.00 V: ZOOM1&2 Inner slide switches (S1 through S4) IC304 5pin Function SMOOTH 2pin SHARPNESS 4pin PAPER TYPE 3pin GAMMA Operation L: NORMAL H: HIGH 0.00 V: NORMAL 2.50 V: SOFT 5.00 V: HARD 0.00 V: TYPE I 1.67 V: TYPE II 3.33 V: TYPE III 5.00 V: TYPE IV 0.00 V: TONE I 2.50 V: TONE II 5.00 V: TONE III 4-8 UP-895/(E)

Section	Page
Cover	1
Table of Contents	3
1.Operating Instructions	7
2.Service Information	17
2-1. Board Layout	17
2-2. Disassembly	17
2-3. Removal of Major Parts	18
2-3-1. Removal of Mechanical Block	18
2-3-2. Removal of MA-99 Board	19
2-3-3. Removal of Switching Regulator	19
2-3-4. Removal of Thermal Head	20
2-4. Tightening the Screws	21
2-5. Installation of Fan Motor	22
3.Electrical Alignment	23
3-1. AGC Adjustment	23
3-2. Video Level Adjustment	23
3-3. Brightness and Contrast Adjustment	24
3-4. Head Voltage Adjustment	25
3-5. Initialization of Print Count History	25
4.Circuit Operation Description	27
4-1. Video Circuit	29
4-1-1. BNC Input Connector - Trap Filter Circuit	29
4-1-2. nC-SYNC Generator Circuit	29
4-1-3. AGC Circuit	29
4-1-4. Brightness and Contrast Control	29
4-1-5. A/D Conversion and D/A Conversion	29
4-2. Clock Generator Circuit	30
4-3. Memory and Head Control Circuit	30
4-3-1. Reading the Serial Data from System Control	31
4-3-2. Writing in Frame Memory	31
4-3-3. Transfer from Frame Memory to Line Memory	31
4-3-4. Thermal Head Control and One-Line Memory	31
4-4. System Control Section	34
4-4-1. Reading of Keys	34
4-4-2. Reading of Function Switches	34
4-4-3. Platen Motor Control	35
4-4-4. Head Up and Down Control	36
4-4-5. Monitor of Door Sensor	36
4-4-6. Monitor of Paper Sensor	36
4-4-7. Monitor of Head Temperature Sensor	37
4-4-8. Control of Head Fan Motor (for Head Cooling)	37
4-4-9. Control of Video Circuit Section	37
4-4-10. Control of Memory and Head Control Circuit	38
4-4-11. Gamma Correction and Thermal Storage Correction	39
4-4-12. Discrimination of Video Signal to be Input	39
4-4-13. Remote Interface	39
4-4-14. Storage of Print Count History	39
4-5. Thermal Head Section	40
4-5-1. Structure	40
4-5-2. Basic Operation	41
4-5-3. Stair Generation	41
4-5-4. Temperature Correction	42
4-5-5. Line Count Correction	42
5.Troubleshooting	43
5-1. Print is Faulty	43
5-2. Print is Too Dark or Too Light	44
5-3. “Paper Sensor” is Out of Order	45
5-4. Head Operation (Up & Down) is Out of Order	46
5-5. Paper Feeding is Out of Order	47
5-6. Door (Opening and Closing) is Out of Order	48
6.Service Mode (Self-diagnostic Function)	49
6-1 Printing the Test Pattern	49
6-2. Up/Down Operation of Head	50
6-3. Feed Operation	50
6-4. Display and Clearing of Print Sheet History	51
7.Semiconductor Pin Assignments	53
8.Spare Parts	55
8-1. Notes on Repair Parts	55
8-2. Exploded Views	56
8-3. Electrical Parts List	61
9.Block Diagram	69
Overall	69
10.Schematic Diagrams and Board Layouts	71
Frame	72
KY-454	73
SE-531	73
SE-532	73
SU-52	73

Match case Limit results 1 per page

4-8

UP-895/(E)

4-4.

System Control Section

The system control section mainly consists of a microcomputer (IC304) and performs the following

processing.

4-4-1.

Reading of Keys

IC304 monitors the PRINT, OPEN/CLOSE, COPY, FEED, and REMOTE keys on the door panel.

Each

key is activated when the falling edge of a signal is detected.

IC304

Signal name

73pin

nDOOR_KEY

74pin

nPRINT_KEY

75pin

nCOPY_KEY

76pin

nFEED_KEY

4-4-2.

Reading of Function Switches

IC304 monitors the setting of a front slide switch, inner slide switches, and a rear DIP switch and reflects

its setting on the operation.

Front slide switch (on the front panel)

IC304

Function

Operation

80pin

POSI/NEGA

NEGA

POSI

1pin

STANDERD/SIDE

STANDARD

SIDE

79pin

PRINT SIZE

0.00 V:

SMALL

1.25 V:

NORMAL

2.50 V:

ZOOM1

3.75 V:

ZOOM2

5.00 V:

ZOOM1&2

Inner slide switches (S1 through S4)

IC304

Function

Operation

5pin

SMOOTH

NORMAL

HIGH

2pin

SHARPNESS

0.00 V:

NORMAL

2.50 V:

SOFT

5.00 V:

HARD

4pin

PAPER TYPE

0.00 V:

TYPE

1.67 V:

TYPE

3.33 V:

TYPE

III

5.00 V:

TYPE

3pin

GAMMA

0.00 V:

TONE

2.50 V:

TONE

5.00 V:

TONE

III