Tandy 6000 HD, Service Manual

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TANDY COMPUTER PRODUCTS
List of Figures
Number Description Page No.
1-1 Major Assemblies, TANDY 6000/6000-HD ......... 2
3-1 Cover/Bezel Assembly Mounting Screws ........ 10
3-2 Electronics Module Assembly .................. 15
4-1 Adjustments ................................... 20
5-1 Cable Interconnection Layout ................. 23
5-2 Cable Wiring/Connector Location
Floppy Disk Drive Version 1 ............... 25
5-3 Cable Wiring/Connector Location
Hard Disk Drive Version 1 ................. 27
5-4 Cable Wiring/Connector Location
Floppy Disk Drive Version 2 ............... 29
5-5 Cable Wiring/Connector Location
Hard Disk Drive Version 1 ................. 31
5-6 RS-232 Serial Interface Cable ............ 34
5-7 Line Printer/Parallel Output Cable .......... 34
5-8 FDC to Internal Drive Cable .................. 36
5-9 Video/Keyboard PCB to Keyboard Cable ........ 37
5-10 DC Power Cable ................................ 38
5-11 AC Input Cable ................................ 39
5-12 Main Logic Board to Sound Board Cable ....... 40
5-13 Video Cable ................................... 41
7-1 Read and Write Cycle Timing .................. 69
7-2 Write Cycle Timing ............................ 70
7-3 Read Cycle Timing ............................. 71
7-4 Refresh Cycle Timing of 68000................. 72
7-5 Bus Arbitration Circuit Timing ............... 77
7-6 Onboard BDTACK Generation .................... 78
7-7 I/O Controller Timing ......................... 81
7-8 Timing for Refresh Logic ..................... 84
7-9 I/O Processor PCB Block Diagram ............. 122
7-10 Video/Keyboard Interface .................... 166
PCB Block Diagram
7-11 Timing D i a g r a m ............................... 168
7-12 MC6845 Pin Identification ................... 170
7-13 Character Dot Pattern ........................ 173
7-14 Keyboard Timing Diagram ...................... 180
7-15 Test Layout, Power Supply ................... 197
7-16 Q7 Collector Waveform ........................ 199
7-17 Q7 Base Waveform ............................. 199
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