
Video Signals Check
This procedure checks the video signals.
1. Turn off the instrument, then remove the bottom cover.
2. On the color module, disconnect the cable that connects the microprocessor board to the color
module. Refer to figure 6-30 for the cable location.
3. Load the operating system into one disk drive and apply power to the instrument. Allow enough
time for the operating system to load.
4. Probe the cable for the horizontal sync, vertical sync, and display data signals. The cable pin
numbers are listed in table 6-1.
The horizontal and vertical sync signals are TTL levels that resemble figure 6-31.
The display data signals have a baseline of approximately
−
1.7 V and vary in amplitude from the
baseline voltage to approximately 125 mV, depending on the characteristics of the colors displayed.
5. Reconnect the cable, then return to the color module flowchart.
Table 6-1. Cable Pin Numbers
Pin Numbers
Signal
3
Horizontal Sync
7
Vertical Sync
21
Red Display Data
29
Green Display Data
37
Blue Display Data
HP 16500A/16501A - Service
6-34
Содержание 16500A
Страница 14: ...Figure 1 1 Dimensional Detail HP 16500A 16501A General Information 1 6 ...
Страница 19: ...Figure 2 2 Power Cord Configurations HP 16500A 16501A Installation 2 3 ...
Страница 33: ...TABLE OF CONTENTS Section III Performance Tests Page 3 1 Introduction 3 1 ...
Страница 43: ...Figure 4 11 CRT Module Adjustment Flow Diagram HP 16500A 16501A Adjustments 4 8 ...
Страница 60: ...Figure 5 1 HP 16500A Assembly Parts HP 16500A 16501A Replaceable Parts 5 4 ...
Страница 62: ...Figure 5 2 HP 16500A Chassis Parts HP 16500A 16501A Replaceable Parts 5 6 ...
Страница 65: ...Figure 5 3 HP 16501A Assembly Parts HP 16500A 16501A Replaceable Parts 5 10 ...
Страница 67: ...Figure 5 4 HP 16501A Chassis Parts HP 16500A 16501A Replaceable Parts 5 12 ...
Страница 71: ...Figure 6 1 HP 16500A 16501A System Overview HP 16500A 16501A Service 6 2 ...
Страница 73: ...Figure 6 2 Microprocessor Block Diagram HP 16500A 16501A Service 6 4 ...
Страница 102: ...This page intentionally left blank HP 16500A 16501A Service 6 33 ...
Страница 106: ...Figure 6 32 Power Supply Check HP 16500A 16501A Service 6 37 ...
Страница 108: ...Figure 6 33 Power Supply Pins HP 16500A 16501A Service 6 39 ...
Страница 118: ...Figure 6 39 Power Supply Replacement HP 16500A 16501A Service 6 49 ...
Страница 120: ...Figure 6 40 Mother Board Replacement HP 16500A 16501A Service 6 51 ...
Страница 122: ...Figure 6 41 Rear Fan Replacement HP 16500A 16501A Service 6 53 ...
Страница 124: ...Figure 6 42 Side Fan Replacement HP 16500A 16501A Service 6 55 ...
Страница 126: ...Figure 6 43 Rear Disk Drive Replacement HP 16500A 16501A Service 6 57 ...
Страница 128: ...Figure 6 44 Front Disk Drive Replacement HP 16500A 16501A Service 6 59 ...
Страница 130: ...Figure 6 45 Microprocessor Board Replacement HP 16500A 16501A Service 6 61 ...
Страница 132: ...Figure 6 46 Front Panel Board Replacement HP 16500A 16501A Service 6 63 ...
Страница 134: ...Figure 6 47 Color Display Module Removal HP 16500A 16501A Service 6 65 ...
Страница 136: ...Figure 6 48 Transferring Parts HP 16500A 16501A Service 6 67 ...
Страница 138: ...Figure 6 49 Color Display Module Installation HP 16500A 16501A Service 6 69 ...
Страница 140: ...Figure 6 50 Expansion Interface Board Replacement HP 16500A 16501A Service 6 71 ...
Страница 142: ...Figure 6 53 Mainframe Interface Board Replacement HP 16500A 16501A Service 6 73 ...