HR-16/HR-16B Drum Machines Service Manual V1.00 7/27/95
HR-16/HR16B Service Manual 1.00

03/31/06

PREFACE
This document is intended to assist the service technician in the operation, maintenance and repair of the HR16 and HR-16B Drum Machines. Together with the HR-16/B Reference Manual, this document provides a complete description of the functionality and serviceability of these machines. Any comments or suggestions you may have pertaining to the document are welcome and encouraged.

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Only Service Centers authorized by Alesis in writing are authorized to perform service and repairs covered by an Alesis warranty (if any), and transfer of the Manual to you does not authorize you to be an authorized Service Center. Therefore, if you perform, or if the Manual is used to perform, any service or repairs on any Alesis product or part thereof, any and all warranties of Alesis as to that product and any service contract with Alesis for that product shall be voided and shall no longer apply for such product, even if your services or repairs were done in accordance with the Manual. All service or repairs done by you or with reference to the Manual shall be solely your responsibility, and Alesis shall have no liability for any such repairs or service work. All such service or repairs are performed at the sole risk of the person performing the service or repairs. You agree that all such work will be performed in a competent, professional and safe manner at all times and to indemnify and fully hold Alesis and its successors and assigns harmless in the event of any failure to so perform. Your purchase of the Manual shall be for your own ultimate use and shall not be for purposes of resale or other transfer. As the owner of the copyright to the Manual, Alesis does not give you the right to copy the Manual, and you agree not to copy the Manual without the written authorization of Alesis. Alesis has no obligation to provide to you any correction of, or supplement to, the Manual, or any new or superseding version thereof. Alesis shall have the right to refuse to sell or otherwise transfer repair parts or materials to you in its sole discretion. You shall not use, sell or otherwise transfer spare or replacement parts supplied by Alesis to you (i) to repair or be used in products manufactured for or by third parties or (ii) to any third parties for any purpose. You shall not make any warranties or guarantees with respect to the products of Alesis or the use thereof on behalf of Alesis or in your own name. The foregoing describes the entire understanding related to sale or transfer of the Manual to you, and no other terms shall apply unless in a writing signed by an authorized representative of Alesis.

WARNINGS

TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE THIS PRODUCT TO WATER OR MOISTURE.

CAUTION

RISK OF ELECTRIC SHOCK DO NOT OPEN
The arrowhead symbol on a lightning flash inside a triangle is intended to alert the user to the presence of un-insulated "dangerous voltage" within the enclosed product which may be of sufficient magnitude to constitute a risk of electric shock to persons.

3.2 Memory Mapped I/O In order to easily control the vast number of hardware functions that the 8031 needs to access, a system of memory mapped I/O is used. The basic idea is to make hardware functions appear to the 8031 as unused memory locations. That way all that the software has to do is write to a memory location in order to send that information to a specific device such as the LCD, or ASIC. 74HC138 (U13) performs the majority of the work in this circuit. Two things are required before U13 becomes active. 1> A15 must be low (i.e. the 8031 is accessing the lower 32K of address space). 2> The 8031 WRite line must be active (the 8031 is performing a memory write). A15 is used to directly control which function (memory or I/O) is active. Once U13 is enabled, addresses A8-A10 are decoded by it, and the latch corresponding to the value of the decoded address is strobed. At this point, data on the 8031 data buss is "written" into the latch. 3.3 Keypad I/O Keypad I/O is handled through a simple polling process Each row of the keypad matrix is pulled low one at a time (via U14 which is memory mapped). If any button along the row is pressed, the corresponding column input (U22) will appear high. If no buttons are pressed, all column inputs will appear as a low. D9D15 and R42-R47 provide protection for the outputs of U14. Use diagram 3 to localize individual button failures. 3.4 MIDI I/O The MIDI hardware is a standard implementation. MIDI out begins at the 8031's TXD port (pin 11) and travels via R6 to the darlington pair Q1/Q2. Note that the 8031's internal pullup is not very strong, and Diagram 3 older units (revision A) may require the addition of an external pullup resistor for the MIDI out to function correctly (see section 7.7). MIDI in consists mostly of the opto isolator (U4), protection diode D6, pullup R7, and threshold resistor R5. Note that the threshold resistor may need to be changed in order to eliminate false MIDI triggers (see section 7.6).

4.0 DM3AG ASIC

The DM3AG ASIC is a complex LSI device, specifically designed for the purpose of playing percussion samples. Obviously, the internal workings of such a device are beyond the scope of this manual. However, a brief description of some of the important pins follows.
NAME MD0-MD7 CLOCK DAC0-DAC16 A0-A19 D0-D7 SNH0 SNH1 SNHIN STRES STB PIN#(s) 27-42-51, 53-60 3-17, 19-23 61-Function 8031 Data Buss Input. Asic Clock Input (6MHz in HR-16). Output to DAC. Mask Address Buss Mask Rom Data Buss Output Sample and Hold Control " " " " " Output Sample and Hold Inhibit. Instruction reset strobe. Instruction latch strobe.

7.0 Updates and Corrections

2N4401

Diagram 7 Diagram 6 7.1 New SRAM Supply Circuit All Revisions. The new SRAM supply circuit (See diagram 7) supplies a solid 5V to the SRAM, preventing input data from being higher in amplitude than the supply voltage, which can cause data corruption. First, remove the original diode (D8), then install the new circuit. Diagram 8 shows the location to install the circuit in Revision A & CA PC boards, while diagram 6 shows the location for revision AQ PC boards. The installation of this circuit is highly recommended, and is absolutely necessary if a 58257 SRAM is in the unit. This is because '257s are much more sensitive to supply voltage the older '256 SRAMs.

Diagram 8

7.2 Glass Zener (D15) Revisions A & CA. For a short time, glass package 1N5231B zener diodes were used instead of the more familiar metal package. These were found to be unreliable, and should be replaced with metal package zeners.
7.3 Dirty Cliff jacks All Revisions. Occasionally, oxidation will build up on the cliff jack contacts, causing the jack normaling to fail. When this happens, some drum sounds will be "lost" when using the unit in mono. (Only one cable plugged in). The solution is to thoroughly clean the normaling contacts (See diagram 9 for location).
Diagram 9 7.4 Ground CE All Revisions. It was discovered that many units returned for odd crashes all appeared to have a common component (National EPROMs). After further investigation it was revealed that it was not due Diagram 10 to defective components, but due to a minor "incompatibility". It was determined that using CE (pin 20) to enable the device took too long, and the 8031 would occasionally attempt to read it's instructions before the data was valid. The solution to this effect was to leave the EPROM permanently enabled, and use OE (pin 22), which operates much faster, to control it's access to the data buss. On revision A PC boards, this requires cutting a trace, scraping the solder mask from the closest ground trace and adding a jumper (see diagram 11). On revision CA PC boards, this requires that pin 20 of the EPROM be lifted out of the socket, and a jumper installed (see diagram 10). On revision AQ PC boards, pin 22 of the EPROM must also be lifted, the end (away from the 8031) of R110 is lifted, and a jumper between the two is added. While non National EPROMs do not seem exhibit this scenario, it's recommended that this update be performed on all units.

C-20 leaking excessively. Faulty 8031, EPROM, or SRAM. Faulty DM3AG ASIC. (Pulling down the 8031 data buss.) Faulty I/O latch pulling down lines on data buss. Other faulty reset component. Open or short in 8031 data buss. Open or short in 8031 address buss. Faulty LCD pulling down lines on data buss. Faulty LCD. Faulty LCD cable. Faulty 74HC138 (U13), or open between U13 and LCD header. C-20 leaking excessively. Faulty 8031, EPROM, or SRAM. D15 is glass package type (Revision A or CA only). R116 is pulling 8031 Vcc too low (revision AQ only).
Troubleshoot and repair as necessary. (see section 7.13) Troubleshoot and repair as necessary. (see section 3.X) Troubleshoot and repair as necessary. Troubleshoot and repair section 3.2) Troubleshoot and repair section 3.1) Troubleshoot and repair section 3.X) Troubleshoot and repair section 3.X) Test with new LCD. Test with new LCD. as necessary. (see as necessary. (see as necessary. (see as necessary. (see
LCD shows no, or scrambled display (the rest of the unit seems to function normally).
Replace and retest. Troubleshoot and repair as necessary. Troubleshoot and repair as necessary. (see section 7.13) Troubleshoot and repair as necessary. (see section 3.X) Replace with metal package type (see section 7.2). Add jumper across resistor.

Intermittent reset.

Intermittent reset. (cont.)

No sound at all.

No sound from a particular drum.

Intermittent buttons.

R28 (reset threshold) is wrong value. (Revision AQ only). Other faulty component is 8031 reset circuit. Faulty DM3AG ASIC, PCM-54 DAC, 4052 analog switch, or op-amp. Faulty volume slider. User error (i.e. drum pads set to wrong outputs, volumes set to )etc.). User error (i.e. drum pads set to wrong outputs, volumes set to )etc.). This is particularly noticeable on drums that panned hard left or right (TOM 1 and TOM 3 of the default drum kit). Dirty, or broken cliff (1/4") jack. This is particularly noticeable on drums that panned hard left or right (TOM 1 and TOM 3 of the default drum kit). Faulty Analog switch. Faulty op-amp (U20, U21) or component in surrounding circuitry. Component failure in keypad circuitry. (This is actually fairly rare, but it can happen). Old keypad PC Board. Dirty rubber keypad. Faulty ribbon cable. Needs MIDI pullup resistor. Faulty Transistor (Q1 or Q2). Faulty 8031. Faulty opto-isolator (U4). Threshold resistor (R5) wrong value. Faulty 8031. Broken 1/8" jack (J6). User error. Faulty 8031. Broken 1/8" jack (J5). User error. Faulty 8031. Faulty integrator capacitor (C11 or C23). Faulty comparator (U1). Faulty slide potentiometer. Broken wire between slider and keypad PC board. Faulty ADC circuit. (Usually if this is the case, the keypad velocity will not work either.) Faulty 8031. Faulty ADC circuit. (most likely a short or open in the binary weighted resistor network). Broken cliff (1/4") jack. Faulty 8031. Faulty SRAM bypass capacitor (blue monoblock type). Faulty or incorrect SRAM. SRAM not in standby mode while power off (CE pin 20 not held high). Faulty battery. Faulty reset circuit (not going into reset during power down). Faulty SRAM. Broken Piezo lead. Faulty cable. Faulty ADC circuit. Faulty reset circuit. Faulty 8031, EPROM, or SRAM. Open or short in address or data busses. Faulty DM3AG ASIC pulling down data buss.

Add another 3K resistor in parallel (see section 7.17). Troubleshoot and repair as necessary. Troubleshoot and repair as necessary. Test AUX outs. Repair as necessary. Check operating parameters. Check operating parameters. Adjust them as necessary.
Troubleshoot and repair as necessary. (see section 7.3)
Troubleshoot and repair as necessary. Troubleshoot and repair as necessary. Troubleshoot and repair as necessary. (see section 3.3) Replace with new style keypad PC board and retest. Clean keypad contacts with non-residue cleaner (such as Blue Shower). Replace and retest. Add if necessary (see section 7.7). Troubleshoot and repair as necessary. Troubleshoot and repair as necessary. Replace and retest. See section 7.6. Troubleshoot and repair as necessary. Replace and retest. See section 5.3. Troubleshoot and repair as necessary. Replace and retest. See section 5.3. Troubleshoot and repair as necessary. Replace and retest. Troubleshoot and repair as necessary. Replace and retest.
No (or intermittent) MIDI out.
No (or intermittent) MIDI in.

No tape out.

No tape in.
Data slider not working at all.
Data slider skipping numbers. Foot switches not working. Not retaining memory when power removed. (No battery backup. Battery is dead.)
Troubleshoot and repair as necessary. (see section 5.2) Replace and retest. Troubleshoot and repair as necessary. (see section 5.2) Troubleshoot and repair as necessary. Replace and retest. Replace capacitor and battery. Check battery current (see section 2.1). See section 2.1. Troubleshoot and repair as necessary. Replace capacitor and battery. Check battery current (see section 2.1). Troubleshoot and repair as necessary. Replace and retest. Troubleshoot and replace as necessary. Replace and retest. Troubleshoot and repair as necessary. Troubleshoot and repair as necessary. Troubleshoot and repair as necessary.
Not retaining memory when power removed. (No battery backup. Battery is not dead.) Drum pads not sensitive to velocity.

12/14/87 1.03

12/16/87 1.04

12/30/87 1.05

1/4/88

6/15/88

8/25/88
1) Fixes bug that caused the HR-16 to send out an incorrect MIDI song position pointer if any tempo change steps occurred in the song previous to the current song position. 2) Fixes bug that caused the HR-16 to send out an incorrect MIDI song position pointer if an empty pattern (8 beats, no drum events) was used in a step of a song previous to the current song position. 3) Added feature that allows "spot erasing" while in record mode when quantize is off. This means that the erase button and a drum button can be held down while recording with quantize off in order to erase all drum events (quantized or not) that occur during the time that the buttons are held down. 4) Added more steps of shuffle resolution, and changed the percentage display relationship to the clock. The original shuffle values and new values are shown below: QUANT 1/4 1/6 1/8 1/12 1/16 1/24 1/32 1/48 1/64 OFF OLD SHUFFLE 0, 50% 0-16, 50%-75% 0-12, 50%-75% 0-8, 50%-75% 0-6, 50%-75% 0-4, 50%-75% 0-3, 50%-75% 0-1, 50%-62.5% 0, 50% 0, 50% NEW SHUFFLE 0, 50% 0-24, 50%-68.8% 0-16, 50%-66.7% 0-12, 50%-68.8% 0-8, 50%-66.7% 0-6, 50%-68.8% 0-4, 50%-66.7% 0-2, 50%-62.5% 0-1, 50%-58.3% 0,50%
Despite the displayed percentage being smaller in the new values, there are actually more shuffle steps than before. The old displayed percentages represented the ratio between the clock location of the shuffled beat, and the clock location half way between two un-shuffled beats. The new percentage represents the percentage of the total time of two occurring beats that the first of a shuffled pair will take. For example, 1/16 notes set to shuffle 8 (shifting every other 16th note 8 clocks late), will result in the first 16th note getting 32 clocks, and the second 16th note getting 16 clocks (instead of 24 each when shuffle=0). This results in the first 16th note getting 66.7% of the total time of both 16th notes (32/48=66.7%), which is equivalent to 16th note triplets. This percentage representation is more useful than the old percentage. ?/?/89 2.00 HR-16 and HR-16/B: 1) Fixes lots o' bugs. 2) Add lots o' features. HR-16/B only: 1) Changed JAM BLOCK name to BLOCK. HR-16 and HR-16/B: 1) Fixed bug which caused single step with swing on to advance in incorrect amounts. If swing was advanced by 1 while in 16th not quantize, the steps would be 23/96, 48/96, 71/96 instead of 25/96, 48/96. 73/96. This is now fixed. 2) Added copyright notice on power on. HR-16 and HR-16/B: 21

?/?/90

7/3/90

3/10/92

1) Fixed bug which caused a wrong amount of silence at the beginning of a pattern if its length was changed to a shorter value from the top and there was no drum event on the old or new downbeat. For example, if no events existed on beats 1 and 2, and the length from top was changed to be shorter by one beat, the amount of silence before the first event would be wrong. 2) Fixed bug which caused sysex loading to be garbled if any real-time MIDI information was received during the sysex dump. This seemed to only be a problem with IBM MPU-401 interfaces. 3) All individuals names have been removed from the software.

11.0 MIDI Implementation

ALESIS HR-16/HR-16B MIDI SYSTEM EXCLUSIVE FORMAT
The following information is provided as a guide for programmers wishing to modify the data received via MIDI from the HR-16 for the purpose of interchanging patterns from separate block dumps, modification of drum setups, MIDI channel assignments, etc. Great care must be taken to insure that all modified addresses are valid, since one incorrect value (the length of a pattern, for example) could result in all data being lost in the HR-16. These errors may not show up immediately, since the incorrect values may not be accessed by the HR-16 until a particular pattern or song is selected. Therefore, it is recommended that any data manipulation programs be thoroughly tested after loading into the HR-16 by selecting and recording on many patterns and songs before assuming that the data is valid. For any of the sysex commands to be transmitted or received, the SYSEX ENABLE function (MIDI/UTIL page 15) must be turned on. All 11 possible commands will be transmitted in the following format: HEX F0H 00H 00H 0EH 01H 00H-0AH. F7H COMMENTS SYSTEM EXCLUSIVE STATUS BYTE
ALESIS I.D. NUMBER HR-16 I.D. NUMBER SYSEX COMMAND DATA EOX
The following sysex commands are transmitted and received by the HR-16:

COMPLETE MEMORY DUMP

A system exclusive MIDI data dump from the HR-16 is initiated by holding the TAPE button down, pressing (and releasing) the left arrow button once, and then pressing the RECORD button. This command is followed by a block of data representing the contents of the HR-16's memory. In order to optimize the data transfer, 8 MIDI bytes are used to transmit each block of 7 HR-16 data bytes. If the 7 data bytes are looked at as one 56bit word, the format for transmission is eight 7-bit words beginning with the most significant bit of the first byte, as follows: SEVEN HR-16 BYTES: A6 A5 A4 A3 A2 A1 B6 B5 B4 B3 B2 B1 C6 C5 C4 C3 C2 C1 D6 D5 D4 D3 D2 D1 E6 E5 E4 E3 E2 E1 F6 F5 F4 F3 F2 F1 G6 G5 G4 G3 G2 G1

0: 1: 2: 3: 4: 5: 6:

A7 B7 C7 D7 E7 F7 G7

A0 B0 C0 D0 E0 F0 G0

0: 1: 2: 3: 4: 5: 6: 7:
TRANSMITTED AS: A7 A6 A5 A4 A3 A2 A0 B7 B6 B5 B4 B3 B1 B0 C7 C6 C5 C4 C2 C1 C0 D7 D6 D5 D3 D2 D1 D0 E7 E6 E4 E3 E2 E1 E0 F7 F5 F4 F3 F2 F1 F0 G6 G5 G4 G3 G2 G1

A1 B2 C3 D4 E5 F6 G7 G0

In order to use the data properly, it must be decoded properly into HR-16 byte format. The following list gives the data locations within the "unpacked" (decoded) block of data, starting with the first byte of the block being 000. NOTE: All absolute addresses must have an offset of 8200H added to them (e.g., an absolute pointer to a pattern that starts at 35AH should have the pointer value 855AH). 000H-0C7H 0C8H 0C9H 0CAH 0CBH 0CCH 0CDH 0CEH 0CFH 0D0H 0D1H 0D2H 0D3H 0D4H 0D5H 0D6H 0D7H 0D8H 0D9H 0DAH 0DBH 0DCH 0DDH 0DEH 0DFH 0E0H 0E1H 0E2H 0E3H 0E4H 0E5H 0E6H 0E7H-0EBH 0ECH-F3H 0F4H 0F5H-FDH DON'T CARE MIDI channel Receive MIDI drum triggers (0=off, 1=on) Transmit MIDI drum triggers (0=off, 1=on) MIDI note assignment of CLICK (0-127) MIDI note assignment of KICK (0-127) MIDI note assignment of SNARE (0-127) MIDI note assignment of CLS HAT (0-127) MIDI note assignment of MID HAT (0-127) MIDI note assignment of OPEN HAT (0-127) MIDI note assignment of CLAPS (0-127) MIDI note assignment of PERC 3 (0-127) MIDI note assignment of PERC 4 (0-127) MIDI note assignment of TOM 1 (0-127) MIDI note assignment of TOM 2 (0-127) MIDI note assignment of TOM 3 (0-127) MIDI note assignment of TOM 4 (0-127) MIDI note assignment of RIDE (0-127) MIDI note assignment of CRASH (0-127) MIDI note assignment of PERC 1 (0-127) MIDI note assignment of PERC 2 (0-127) MIDI echo (0=off, 1=on) MIDI program select (0=off, 1=on) Clock mode (0=MIDI & internal, 1=internal only, 2=tape) MIDI clock out (0=off, 1=on) Auto start (0=off, 1=on) Click value Click in play (0=off, 1=on) Manual voice/tune/mix (0=off, 1=on) Pad dynamics (0-0AH) Song loop (0=off, 1=on) Sysex enable (0=off, 1=on) Software version: 5 ascii bytes, starting with a space (20H) if an HR-16, or a "B" (42H) if an HR-16B, followed by a 4 digit version number (e.g., "2.00", or 32H, 2EH, 30H, 30H) DON'T CARE 0 DON'T CARE 24
0FEH 0FFH 100H-187H 188H-191H 192H-1A1H 1A2H-1FFH 200H 201H 202H 203H 204H 205H " 2C6H 2C7H 2C8H-2CCH 2CDH 2CEH 2CFH-2D0H 2D1H 2D2H 2D3H-2D4H 2D5H 2D6H-2D7H 2D8H 2D9H 2DAH 2DBH-2FFH 300H-301H 302H 303H 304H 305H 306H 307H " 3C8H 3C9H 3CAH-3CCH 3CDH-3D2H 3D3H-3D6H 3D7H-3FFH 400H-?

27H 0B5H DON'T ALTER(this can be DON'T CARE if manual voice/tune/mix is off) DON'T CARE 0 DON'T CARE MSB of absolute pointer to pattern 00 LSB of absolute pointer to pattern 00 MSB of absolute pointer to pattern 01 LSB of absolute pointer to pattern 01 MSB of absolute pointer to pattern 02 LSB of absolute pointer to pattern 02 " " " " MSB of absolute pointer to pattern 99 LSB of absolute pointer to pattern 99 DON'T ALTER LSB of absolute pointer to first byte past SONG 99 data MSB of absolute pointer to first byte past SONG 99 data DON'T ALTER LSB of FF00H minus data in 0CDH & 0CEH MSB of FF00H minus data in 0CDH & 0CEH DON'T ALTER Shuffle amount (0-24, 0=50%) DON'T ALTER Tempo (20-255) Quant clock count (must correspond to Quant value 0-9: 96, 64, 48, 32, 24, 16, 12, 8, 6, 1) Quant value (0-9) DON'T CARE DON'T ALTER MSB of absolute pointer to song 00 LSB of absolute pointer to song 00 MSB of absolute pointer to song 01 LSB of absolute pointer to song 01 MSB of absolute pointer to song 02 LSB of absolute pointer to song 02 " " " " MSB of absolute pointer to song 99 LSB of absolute pointer to song 99 DON'T ALTER DON'T CARE DON'T ALTER DON'T CARE PATTERN 00 DATA
The pattern and song data must be dealt with in a specific manner: 1) All pattern and song data must be in consecutive order, i.e., pattern 05 data cannot be before pattern 02's data. The order for the data should be pattern 00 through 99, followed by song 00 through 99. HR-16/HR16B Service Manual 1.00 25
2) If a pattern or song does not exist, its MSB pointer will = 0, which is an illegal pointer address. Since there will be no data for this pattern, it is skipped, i.e., if pattern 04 is empty, pattern 05's data follows after pattern 03's data. 3) There can be no gaps in the data. Pattern 01's data must follow directly after pattern 00's data, etc. 4) Locations 2CDH-2CEH (start of free memory) and 2D1H-2D2H (length of free memory) must be kept valid. 5) Song 99 MUST exist. This means that at least an empty song (03H 00H FFH) must be at the end of memory, and song 99 must point to it. 6) It is suggested that all DON'T CARE data be left in the state that it is received in, although these locations can be replaced with zeroes.
PATTERN DATA FORMAT The following is the format of each pattern, starting with the address pointed to byte the absolute pointer to the pattern (offset by 8200H): 00H 01H 02H 03H 04H 05H 06H 07H 08H 09H 0AH 0BH 0CH 0DH 0EH 0FH 10H 11H 12H 13H 14H 15H 16H 17H 18H 19H 1AH 1BH 1CH 1DH 1EH 1FH 20H 21H LSB of number of bytes in pattern, including header. MSB of number of bytes in pattern, including header. LSB of number of beats in pattern in BCD format (0 beats = MSB of number of beats in pattern in BCD format empty pattern) KICK sound number (0-30H) KICK output assign (bit 7) and volume (bits 0-6: 0-63H) KICK panning (bits 5-7: 0=L, 6=R) & pitch (bits 0-4:0=-16, 1FH=+15) SNARE sound number (0-30H) SNARE output assign (bit 7) and volume (bits 0-6: 0-63H) SNARE panning (bits 5-7: 0=L, 6=R) & pitch (bits 0-4:0=-16, 1FH=+15) CLS HAT sound number (0-30H) CLS HAT output assign (bit 7) and volume (bits 0-6: 0-63H) CLS HAT panning (bits 5-7: 0=L, 6=R) & pitch (bits 0-4:0=-16, 1FH=15) MID HAT sound number (0-30H) MID HAT output assign (bit 7) and volume (bits 0-6: 0-63H) MID HAT panning (bits 5-7: 0=L, 6=R) & pitch (bits 0-4:0=-16, 1FH=15) OPN HAT sound number (0-30H) OPN HAT output assign (bit 7) and volume (bits 0-6: 0-63H) OPN HAT panning (bits 5-7: 0=L,6=R) & pitch (bits 0-4:0=-16, 1FH=15) CLAPS sound number (0-30H) CLAPS output assign (bit 7) and volume (bits 0-6: 0-63H) CLAPS panning (bits 5-7: 0=L, 6=R) & pitch (bits 0-4:0=-16, 1FH=+15) PERC 3 sound number (0-30H) PERC 3 output assign (bit 7) and volume (bits 0-6: 0-63H) PERC 3 panning (bits 5-7: 0=L, 6=R) & pitch (bits 0-4:0=-16, 1FH=+15) PERC 4 sound number (0-30H) PERC 4 output assign (bit 7) and volume (bits 0-6: 0-63H) PERC 4 panning (bits 5-7: 0=L, 6=R) & pitch (bits 0-4:0=-16, 1FH=+15) TOM 1 sound number (0-30H) TOM 1 output assign (bit 7) and volume (bits 0-6: 0-63H) TOM 1 panning (bits 5-7: 0=L, 6=R) & pitch (bits 0-4:0=-16, 1FH=+15) TOM 2 sound number (0-30H) TOM 2 output assign (bit 7) and volume (bits 0-6: 0-63H) TOM 2 panning (bits 5-7: 0=L, 6=R) & pitch (bits 0-4:0=-16, 1FH=+15) 26

STEP EDIT MODE This command is used to enter or exit step edit mode, as well as for stepping through the edited pattern. If it is received while in song mode, it will be ignored. If a step command is given while not in step mode, it will also be ignored. The HR-16 will always transmit the current quantize and swing settings before sending an enter step command. When receiving a step to next beat, any additional drums on the existing beat will be skipped. When receiving a step to next drum command when currently on the last drum of a beat, the command will be ignored. 000000xxB F7H x: 0=enter step mode, 1=exit step mode, 2=step to next beat, 3=step to next drum EOX
REQUEST SYSEX DUMP This command is used to request a complete sysex memory dump from the HR-16. After receiving this command (if not in PLAY mode), the HR-16 will send out its complete memory via MIDI. F7H EOX
CHANGE VOICE, TUNE, MIX SETTINGS This command is receive only, and is used to change the voice settings of the current pattern. It can function while the pattern is playing, and will update the display if the settings being displayed are
changed. It will be ignored if in song mode. The format is packed as 8 MIDI bytes per 7 data bytes as described in the MIDI bulk dump explanation. The data is identical to bytes 4 through 33H in the pattern data format. data F7H 48 data bytes, transmitted as 55 MIDI bytes EOX
MIDI COMMUNICATIONS TEST This command is used to insure that bi-directional MIDI communication is functioning. If an HR-16 receives the inquiry command (F0H, 00H, 00H, 0EH, 01H, 09H, 00H, F7H), it will respond with the response command (F0H, 00H, 00H, 0EH, 01H, 09H, 01H, F7H) only if MIDI ECHO is turned off. If MIDI ECHO is on, the transmitting device will see the inquiry message returned to it if bi-directional communication is functioning. This function is useful in determining that the HR-16 is ready to receive additional MIDI information. For example, selecting a pattern, or copying a pattern can cause a delay in which the HR-16 will ignore incoming MIDI information if its input buffer overflows. By sending this command after a copy pattern command (command 5), and then waiting for the response before sending any additional commands, it can be insured that the HR-16 will not miss any information. 0000000xB F7H x=0=MIDI inquiry, x=1=MIDI response EOX

ERASE PATTERN OR SONG This command is used to erase the currently selected pattern or song. It will be ignored if in play mode. F7H EOX
12.0 Service Manual History
7/27/95 V1.00 1st release.
+ +12V, 1, 2 +5V, 1, 3, 15 -12V, 1/4 inch jacks, 6 1/8 inch cable, 8 12MHz, 3 1N5231B, 9, 4052, 6, 16, 5.1V zener, 6MHz, 74HC04, 10, 18 74HC04s, 6 74HC138, 4, 15, 18 74HC540, 6, 18 7805, 1, 18 7812, 1, 18 7912, 1, 8031, 3, 4, 5, 6, 7, 8, 10, 11, 13, 15, 16, 18 A A, 1, 4, 6, 7, 9, 10, 11, 12, 13, 15, 23, 27 A0-A19, 5 A15, 4 A8-A10, 4 adapter, 1 adapters, 7 ADC, 16 Address Buss, 5, 8, 15 adjustment, 6, 8, 9, 17 Analog switch, 6, 16 analog to digital, 6 AQ, 1, 6, 9, 10, 11, 13, 15, 16, 18 ASIC, 3, 4, 5, 6, 10, 15, 16, 17, 18, 19 audio test, 8 Auto start, 24 B Battery backup, 2, 3, 8, 12, 16 battery drain, 2, 12 binary weighted resistor network, 6, 16 button failures, 4 buzz, 8 bypass, 1, 14, 15, 16 C C1, 1, 18 C11, 13, 16, 18 C16, 6, 18 C2, 1 C20, 3, 12 C23, 13, 16 C3, 1 C34, 6, 18 C4, 1, 18 C47, 12 C5, 1, 15, 18 C50, 6 C59, 2 C6, 1, 18 C62, 3, 14 C64, 3 C65, 3 C7, 1 CA, 1, 9, 10, 11, 12, 13, 14, 15 cassette, 6, 20 CE, 5, 10, 16 ceramic disk, 12, 13, 15 chokes, 13 Click value, 24 cliff jack, 10 CLOCK, 3, 5, 10, 15, 21, 24, 25 comparators, 6 contacts, 10, 12, 16 COPY, 29, 30 crashes, 10, 16, 17 D D1, 1, 18 D15, 3, 4, 15, 18 D19, 6 D2, 1, 18 D21, 11 D3, 1 D4, 1 D5, 1, 15 D6, 4, 18 D7, 2, 5 D8, 9 DAC, 5, 6, 8, 11, 16, 17, 18, 21 DAC0-DAC16, 5 data buss, 2, 3, 4, 5, 10, 15, 16, 17 data corruption, 2, 3, 9 data slider, 6, 16, 17 DataDisk, 7 distortion, 13 DM3AG, 3, 5, 6, 15, 16, 17 drift, 12 dropouts, 7 E EPROM, 3, 8, 10, 15, 16, 17 H hot glue, 13 HR-16, 3, 5, 6, 7, 8, 11, 12, 15, 17, 18, 20, 21, 22, 23, 24, 28, 29, 30 HR-16B, 17, 18, 23, 24 I I/O, 3, 4, 6, 8, 15, 17 Instruction latch strobe, 5 Instruction reset strobe, 5 internal diagnostics, 8 J J1, 1, 18 J11, 6, 18 J12, 11, 18 J5, 16, 18 J6, 16 jitter, 6 jumper, 10, 11, 13, 15 K keypad, 3, 4, 6, 12, 16, 18, 19, 20 L LCD, 3, 4, 11, 15, 18, 20 LED Test, 8 Lithium, 2, 18 lock-up, 3 low order address, 3 low power, 2, 13 LSI, 5 M Manual voice/tune/mix, 24, 25 Mask Rom, 5, 17, 18 mask ROMs, 5 MD0-MD7, 5 MEM PWR, 2 MEMORY DUMP, 23, 29 memory mapped I/O, 3, 4 microprocessor, 1 MIDI, 3, 4, 8, 11, 15, 16, 20, 21, 22, 23, 24, 28, 29, 30 mono, 10, 18 monolithic block ram capacitors, 12, 13 Most Significant Bit, 6, 23 N noise, 2, 3, 7, 8, 11, 12, 13, 14 normaling, 10 O OE, 10 op-amp, 3, 16, 17 opto isolator, 4, 11 oscillation, 3 Output Sample and Hold, 5 output section, 6 Oxidation, 7, 10 oxidize, 12 P PATTERN DATA, 26, 27, 30 PCM-54, 6, 8, 12, 16, 17 piezo, 3, 6, 16, 18 power supply, 1, 13, 14, 15, 17 program, 3, 20, 24 program change, 21 pullup resistor, 4, 7, 16

PUP, 2, 14, 17 Q Q1/Q2, 4 Q10, 2, 18 Q11, 2 Q12-Q13, 3 Q3, 6 Q4, 3 Q5, 3 QUANTIZE, 21, 22, 28, 29 R R.F., 1, 10, 11, 13 R.F. suppression, 1 R10, 3 R100, 3, 19 R105, 3 R110, 10 R133, 13 R16-R20, 6 R22, 6, 19 R23, 6, 19 R24, 3, 12, 19 R25, 3 R27, 3 R28, 3, 13, 16, 19 R29, 3 R30, 3 R41, 12, 19 R5, 4, 11, 16, 19 R52, 6 R53, 6 R54, 6, 19 R6, 4, 11, 19 R60, 12 R63, 6, 19 R68, 6 R7, 4, 11, 19 R73-R75, 6
R90, 6, 8, 18 R96, 3 R97, 2 R99, 3 RAM Test, 8 raw +10V, 1, 3 read, 3, 6, 10, 20 reinitializing, 8 reset, 1, 2, 3, 12, 13, 15, 16 ribbon cable, 16 ROM Test, 8 RXD, 3 S S1, 1 samples, 5 self test, 8 shield, 11 shorts, 1, 11 SHUFFLE, 21, 25 SIP, 6, 19 SNH0, 5 SNH1, 5 SNHIN, 5 software history, 15 solder mask, 10, 11 SONG DATA, 25, 26, 27, 28 Song Pointer, 20 SRAM, 1, 2, 3, 8, 9, 15, 16, 18 SRAMs, 2, 9 standby current, 2 STB, 5 steering diode, 2 STEP EDIT, 29 stereo panning, 6 STRES, 5 SYSEX, 22, 23, 24, 29 T tape backup, 6
tape input, 6, 8, 13 Tape output, 6, 7 tape sync, 6, 20 threshold, 3, 4, 11, 12, 13, 16 TOM 1, 16, 24, 26 TOM 3, 16, 24, 27 trimpot, 6, 8, 11, 18 troubleshooting, 3, 15 TXD, 3, 4, 11 U U1, 3, 6, 16, 18 U10, 1, 18 U11, 3, 18 U13, 4, 15, 18 U14, 4, 18 U19, 6, 18 U2, 6, 18 U20, 2, 6, 14, 16, 18 U21, 6, 16 U22, 4, 18 U3, 6 U4, 4, 16 U6, 10, 13, 18 U8, 1, 18 U9, 1, 18 update, 10, 30 user error, 6, 15, 16 V Vcc, 15 velocity, 6, 16 voltage doubler, 1 volume slider, 6, 13, 16, 17 W wave shaping, 6, 7 write, 3, 4 Z Z1, 3, 18