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Sony UP895 Service Manual - Page 70

Overall 2/2, MA-992/2

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MA-99(2/2) Overall (2/2) Overall (2/2) 2 4 10 VIDEO IN R1,R2 75Z TERMINATION 1/2 TO DIP-SW(S300) FL1,Q51 IC1 5 1 7 3 SELECTOR1 15 VIN 3 SYNCOUT 10 Q220 1 3 Q6 CNTROUT IN OUT IC2 BUFFER IC6 AMP VIDEO AMP 1 VIDEO AMP 2 11 CNTR 8 VCC 2 CLT TRAP FILTER Q50 AMP FL2,Q52 TRAP FILTER Q13 PEDESTAL CLAMP Q14 INTEGRATION CIRCUIT 3 Q200 Q17 CONTRAST GENERATOR AMP Q11,Q12 CLAMP PULSE GENERATOR IC4 7 12 VIDEO AMP 13 16 5 14 RV5 CONTRAST ADJUST AGC CIRCUIT RV2 RV3 GAIN REF ADJUST ADJUST IC5(1/3) SELECTOR2 TO SYSTEM CONTROLOR(IC304) 1/2 NT/PAL 1/2 nTRAP 1/2 nCSYNC 1/2 nAGC Q40 SYNC GENERATOR RV4 AGC OFF ADJUST 1/2 CONTRAST 1/2 BRIGHT TO FRONT PANEL(CN14) CONTRAST-H CONTRAST-L CONTRAST-C BRIGHT-H BRIGHT-L BRIGHT-C 11-4 D[7-0] L2,L3 Q7 21 VIN LPF AMP IC500 A/D CONV 19 VRT 14 23 CLK VTB RV6 Q16 BRIGHT ADJUST AMP Q21 REFERENCE GENERATOR VIDEO-OUT CN10 1 RY1 8 10 7 GND 5 3 6 SELECTOR4 Q1 RELAY DRIVE THRUE/EE 1/2 TO SYSCON(IC304) IC5(1/3) 2 15 1 SELECTOR3 Q174 HSYNC GENERATOR Q173 AMP 20 VOUT 8-1 D[7-0] IC502 D/A CONV 12 CLK 16 9 REF BLK R538,R539,R540 REFERENCE GENERATOR AD[7-0] 1/2 TO MEMORY&HEAD CONTROLOR(IC501) CLKOUT 1/2 TO MEMORY&HEAD CONTROLOR(IC501) PULSE 1/2 TO MEMORY&HEAD CONTROLOR(IC501) MA-99(2/2) 9-2 9-2 OVERALL (2/2) 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

9-2

UP-895/(E)

9-2

RV5

ADJUST

CONTRAST

AGC OFF

ADJUST

RV4

RV3

REF

ADJUST

GAIN

RV2

TO MEMORY&HEAD CONTROLOR(IC501)

TO FRONT PANEL(CN14)

TO SYSTEM CONTROLOR(IC304)

TO SYSCON(IC304)

TO DIP-SW(S300)

8-1

11-4

AMP

BRIGHT

RV6

Q16

ADJUST

AMP

L2,L3

LPF

AMP

VIDEO

IC4

AMP

Q14

INTEGRATION

CIRCUIT

Q13

PEDESTAL

CLAMP

CLAMP PULSE

GENERATOR

Q11,Q12

GENERATOR

BRIGHT-H

CONTRAST-L

CONTRAST-C

BRIGHT-C

BRIGHT-L

CONTRAST-H

Q220

BUFFER

IC5(1/3)

GENERATOR

BLK

1/2

DRIVE

RELAY

CNTR

SYNCOUT

CNTROUT

VIN

Q17

VCC

CLT

OUT

MA-99(2/2)

CN10

SELECTOR4

RY1

Q173

AMP

HSYNC GENERATOR

Q174

SELECTOR3

REF

IC502

VOUT

GENERATOR

D[7-0]

R538,R539,R540

REFERENCE

D/A CONV

CLK

GENERATOR

REFERENCE

Q21

D[7-0]

CLK

VTB

VRT

VIN

A/D CONV

IC500

AMP

CONTRAST

Q200

VIDEO AMP 2

IC6

VIDEO AMP 1

IC2

SELECTOR2

IC5(1/3)

AGC CIRCUIT

Q40

SYNC

SELECTOR1

IC1

FL2,Q52

TRAP FILTER

FL1,Q51

AMP

Q50

R1,R2

VIDEO-OUT

VIDEO IN

MA-99(2/2)

1/2

AD[7-0]

1/2

PULSE

GND

CLKOUT

THRUE/EE

nAGC

nTRAP

NT/PAL

nCSYNC

BRIGHT

CONTRAST

TERMINATION

Overall (2/2)

OVERALL (2/2)