Equipment information

Alesis HR-16B Drum
Manufacturer:
Model:
HR-16B
Date:
1995
Category:
Group:
Description:
Drum Machine
Service Manual
Manual Type:
Service Manual
Pages:
40
Size:
916.58 Kbytes (938577 Bytes)
Language:
english
Revision:
1
Manual-ID:
Date:
1995 07 27
Quality:
Electronic document, no scan, very well readable.
Upload date:
2017 09 26
MD5:
411563d2dc4a40e5cebf50b5c4747e77
Downloads:
1048

Information

PREFACE ... ii READ THIS! ... ii WARNINGS ... iii SAFETY SUGGESTIONS ... iv General Troubleshooting ... v 1.0 General Description ... 1 1.1 Main PC Board Revisions ... 1 2.0 Power Supply ... 1 2.1 Battery Backup ... 2 2.2 PUP Circuit ... 2 3.0 The 8031 ... 3 3.1 Reset ... 3 3.2 Memory Mapped I/O ... 4 3.3 Keypad I/O ... 4 3.4 MIDI I/O ... 4 4.0 DM3AG ASIC ... 5 4.1 Mask ROMs ... 5 5.0 Analog Signal Paths ... 6 5.1 Drum Signal Output ... 6 5.2 Piezo/Data Slider Input ... 6 5.3 Tape I/O ... 6 5.4 Tape Output ... 7 5.5 Tape Input ... 7 6.0 Test Procedures ... 7 6.1 General Testing ... 8 6.2 Internal Diagnostics and Hidden Keys ... 8 6.3 DAC Adjustments ... 8 7.0 Updates and Corrections ... 9 7.1 New SRAM Supply Circuit ... 9 7.2 Glass Zener (D15) ... 9 7.3 Dirty Cliff jacks ... 10 7.4 Ground CE ... 10 7.5 RF resistor ... 10 7.6 10K MIDI Resistor (R5) ... 11 7.7 MIDI Pullup ... 11 7.8 RF Shields ... 11 7.9 LCD Contrast Adjustments ... 11 7.10 DAC Drift ... 12 7.11 Old Keypad PC Boards ... 12 7.12 Lifting R41 ... 12 7.13 Reset Capacitor ... 12 7.14 Sram Capacitor ... 12 7.15 Tape Capacitors ... 13 7.16 RF chokes ... 13 7.17 AQ reset threshold ... 13 7.18 AQ R116 ... 13 7.19 Volume Slider Wiring ... 13 7.20 PUP Capacitor ... 14 8.0 Common Solutions ... 15 9.0 Service Parts List ... 18 10.0 Software History ... 20 11.0 MIDI Implementation ... 23 12.0 Service Manual History ... 31 INDEX ... 32

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