HP D8904, Service Manual, Page: 2 / 72

TABLE OF CONTENTS
PAGE
1. SPECIFICATIONS ..................................................................................................... 3
2. PRECAUTION AND NOTICES ................................................................................ 5
2-1 SAFETY PRECAUTIONS .............................................................................. 5
2-2 PRODUCT SAFETY NOTICE ....................................................................... 5
2-3 SERVICE NOTES ........................................................................................... 5
2-4 HIGH VOLTAGE WARNING ....................................................................... 6
3. OPERATING INSTRUCTIONS ................................................................................ 7
4. ADJUSTMENT .......................................................................................................... 8
4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS ............................... 8
4-2 MAIN ADJUSTMENTS ................................................................................. 8
4-3 ADJUSTMENT METHOD ............................................................................. 8
5. CIRCUIT DESCRIPTION .......................................................................................... 12
5-1 MICRO CONTROLLER CIRCUIT .............................¡K¡K¡K¡K¡K¡K¡K¡K... 12
5-2 DEFLECTION CIRCUIT .............................¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K¡K... 13
5-3 TRANSISTOR & DIODE CIRCUIT .............................¡K¡K¡K¡K¡K¡K¡K¡K. 14
6. TROUBLE SHOOTING CHART .............................................................................. 15
6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS .............................. 15
6-2 ABNORMAL DISPLAY ................................................................................. 17
6-3 NO BLANKING .........................................................................................¡K. 18
6-4 HOR. /OSC /DEF /HV CIRCUIT FAULT ...................................................... 18
6-5 ABNORMAL HORIZONTAL DEFLECTION .............................................. 19
6-6 ABNORMAL VERTICAL SCANNING ........................................................ 20
6-7 SIDE-PIN CUSHION DISTORTION ............................................................. 20
6-8 POOR FOCUS ................................................................................................. 20
6-9 POWER SUPPLY TROUBLE SHOOTING CHART .................................... 21
7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY...................................... 22
8. PARTS LISTING ....................................................................................................... 23
9. BLOCK
DIAGRAM .....................................................................¡K¡K¡K¡K¡K¡K¡K..
41
10. IC BLOCK DIAGRAMS............................................................................................ 43
11. PCB LAYOUT ............................................................................................................ 48
12. SCHEMATIC DIAGRAM ......................................................................................... 50
Page 3 of 71 5Elr SERVICE MANUAL
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