Roland
EP-11
Bass pattern
| Rock | Bossanova | |
|---|---|---|
| IV | ||
| Ш | ||
| П | ||
| I |
Rhythm & Chord cutting pattern
|
9:
BD SD |
RS C.HH CY | |
|---|---|---|
| Rhythm | Chord | |
| Rock | $2 A Pr 1 Pr | |
|
Bossa
Nova |
T BT BT BP | 4Prpppppppppp |
| Disco |
7 87 8
|
$7, D7, D7 |
| March | $7- D-7 D7 D7 | |
| Swing | ||
| Shuffle | Dit BT | |
| Slow rock | ||
| Waltz |
Arpeggio pattern (with keys C,E and G depressed)
| Rock,Bossanova,Disco,March | Swing,Shuffle | |
|---|---|---|
| īV | ||
| ш | ||
| П | ||
| Ι |
| UDD9252C-5 |
| μ - 062530-5 |
| PROGRAMMABLE INTERVAL TIMER |
| , | |||
|---|---|---|---|
| D, | 24 | Vcc (+ | |
| D6 0 | 2 | 23 | WR |
| D; • | 3 | 22 | RD |
| D, | 4 | 21 | CS- |
| D1 0 | 5 | 20 | A1 |
| D: | 6 | 19 | • A0 |
| D, • | 7 | 18 | CLK 2 |
| D, | 8 | 17 | OUT 2 |
| LK 0 | 9 | 16 | GATE 2 |
| UT 0 | 10 | 15 | CLK 1 |
| TE 0 | 11 | 14 | GATE 1 |
| GND • | 12 | 13 | OUT 1 |
| 1 |
| A 0 | A1 | WR | RD | ΖŚ | |
|---|---|---|---|---|---|
| Load Counter No. 0 | 0 | 0 | 0 | 1 | 0 |
| Load Counter No. 1 | 1 | 0 | 0 | 1 | 0 |
| Load Counter No. 2 | 0 | 1 | 0 | 1 | 0 |
| Write Mode Word | - | 1 | 0 | 1 | 0 |
| Read Counter No. 0 | 0 | 0 | 1 | 0 | 0 |
| Read Counter No. 1 | 1 | 0 | 1 | 0 | 0 |
| Read Counter No. 2 | 0 | 1 | 1 | 0 | 0 |
| No-Operation 3-State | 1 | 1 | 1 | 0 | 0 |
| Disable 3-State | х | х | х | х | 1 |
| No-Operation 3-State | х | х | 1 | 1 | 0 |
CIRCUIT DESCRIPTION
KEYBOARD & FUNCTION SWITCHES SCANNING
The CPU scans the keyboard and the function switches through matrix to know what keys or switches have been pressed and at what position switches are set.
One side of the matrix connects to (and through) address decoder IC14 to data bus, the other to port 1 through inverters IC12 and IC13. To read the keyboard, for example – see table below, the CPU places number 0000(16) on the data bus (DB6-DB3). The address decoder IC14 reads the data bits and holds OUT 0 low. Whatever keys in the busbar section are depressed will place high on their connecting port 1 pins. Example, when C2 key has been pressed, Port 1-0 will be H. Next, the CPU holds 0001 on the data bus and reads the matrix output at port 1. And down to 1001.
Input Matrix
| BUS | PORT- | -1 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 6543 | 0 | l | 2 | 3 | 4 | 5 | 6 | 7 | |
| 0000 | C2 | C# | D | D# | E | F | F# | G | |
| 0001 | G# | А | A# | В | С | C# | D | D# | |
| 0010 | Е | F | F# | G | G# | А | A# | В | LOWEI |
| 0011 | C4 | C# | D | D# | Е | F | F# | G | UPPEI |
| 0100 | G# | A(442) | A# | В | С | C# | D | D# | |
| 0101 | Е | F | F# | G | G# | A | A# | В | |
| 0110 | С | C# | D | D# | Е | F | F# | G | |
| 0111 | G# | А | A# | В | C7 | NOT USED | NOT USED | NOT USED | |
| 1000 | NORMAL | BASS | CHORD | ARPEGGIO | TRANSPOSE | HOLD | HARMONY |
START/
STOP |
|
| 1001 | ARPE |
GGIO
ATION |
RH | YTHM SELE | CT | BASS VA | RIATION | NOT USED |
To read some function switches the CPU needs additional information or subsequent process as below.
TRANSPOSE
Together with TRANSPOSE, a key to which current scale is to be shifted must be identified by pressing new note higher than middle C on the keyboard.
HOLD. START/STOP
Although these switches are momentarily-closed type, each switch should cause CPU TO or T1 pin to be kept at the following levels respectively during the mode.
T0 ... RHYTHM: STOP-H; START-L
T1 ... HOLD: OFF-H; ON-L
Every time the switch is pressed the CPU latches data into IC15, inverting the signal at the output pin.
Hold signal is sent to T1 via OR gate TR15, and in NORMAL mode, it is disabled by TR19 shorting to ground.
TONE GENERATION
MODE 3: Square Wave Generator
Master oscillator consisting of TR5 and TR7 routes 2.54MHz signal to Programmable Interval Timers IC8-IC10, which being operated in MODE-3 (see Fig. right),
Fah 3 1982
output squarewave with frequency determined by a number "n". The 8253 is organized as 3 independent 16-bit counters, each counter can divide input (CLOCK) by up to 65535 (FFFF). One of three 8253's is selected by CS and one of three counters by A0 and A1 inputs. The table below lists the assignment of counters to
keyboard. When a key is pressed on the EP-11, the CPU refers to "frequency table" stored in on-chip ROM to obtain data corresponding to "n" for that key. Then, the CPU issues 16-bit "n" data on to the data bus in 8-bit x 2 format.
Exp. n = 2873 (B39), counter output = 2540000 ÷ 884Hz.
| Normal | Auto Bass | Auto Chord | AutoArpegi | ||
|---|---|---|---|---|---|
| 8253 | 0 | Lower | Lower | Lower | |
| 0 | l | 4 notes | 4 notes | 4 notes | |
| ICIO | 2 | (Rhythmic) | (Arpeggio) | ||
| 8253 | Ö | ₩hole | , | ||
| l | l | 8 notes | Upper | Upper | Upper |
| IC9 | 2 | 4 notes | 4 notes | 4 notes | |
| 8253 | 0 | ||||
| 2 | l | ||||
| IC8 | 2 | Auto Bass | Auto Bass | Auto Bass | |
TONE GATE. ENVELOPE
Each output (CLOCK, 50% duty) from the counters in IC8-IC10 is frequency divided by flip-flop ½IC1. Divided waveform is NORed with direct clock signal at the base of TR1 to produce 25% duty cycle squarewave, one-half the input signal in frequency, having waveform suited to bass and piano sounds.
Envelope to be chopped by this base input is developed and fed to TR1 collector as follows.
When key(s) is pressed, CPU transfers serial gate data for that key(s) – maximum 8 keys – through DB7 to D pin of IC7 which, with Enable input, holds output pin(s) (addressed by A, B and C inputs) low in sequence. Called GATE signal.
The negative edge of GATE signal is differentiated by C2 x R9 and forward biases TR4, bringing C1 into full charge. Upon gate OFF, C1 discharges through TR3 which, however, with SUSTAIN ON, is cut off by a ground placed at base through conducting TR2. During Sustain ON C1 discharge rate is controlled by a voltage determined by SUSTAIN control setting.
CONTROL
PEDAL
LED LIGHTING
The function of Latch IC15 is essentially the same as that of Gate latch except the data is supplied from DB6.
RHYTHM TRIGGER. TEMPO LED LIGHTING. BASS GATE. DIN START/STOP
The 8 bits on the data bus, each bit distinctly represents individual data, are latched into independent flip-flips in IC20 and IC21, and from where outputted at the same time.
TEMPO CLOCK OSCILLATOR
The Rhythm clock oscillator is comprised of sawthooth generator (IC12 and TR13) and flip-flop (½IC6) which provides for 24 clocks/quater note whenever the EP-11 is on.
The clock is reset upon "rhythm start ON" and resumes after 5-10ms, allowing for positive synchronization with external instrument being controlled by the EP-11 via DIN socket.
When START/STOP is pressed for running, a low from Q2 of IC21 is distributed to (a) base of TR12 (discussed later), and TR14 from there (inverted to high) to (b) DIN socket and (c) a node to C22 and C23.
C23 differentiates positive edge of start signal and resets the flip-flip with the pulse. Similarly, with a positive pulse via C22, IC12 swings pin 2 to negative to fire TR13 which in turn rapidly charges C21, keeping pin 13 outside a threshold, thus causing generation to cease for 5-10ms (C22 x R39 time constant).
Rhythm clock is also used to control the EP-11 rhythm tempo and is accepted by the CPU through INT pin. However, to reduce interfarence with the CPU's other operations, it is processed as follows before being fed to INT pin.
(a) Clock is ANDed with Start signal from Q2 pin of IC21 at TR12 whose 50% squarewave is differentiated by C24 and converted to 1ms negative going pulse through TR17.
(b) Without Start signal, clock is not allowed to pass through TR12.
Feb.3.1982
NA
N
S
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
PANEL BOARD-A OPH157A(149H157A)(pcb 052H345A) Foil side
Component side
: M5218L
: 74LS259
· 4584
: 4069U
: 74LS42 : 4099
noise, selected
• M51 8049-055P
PANEL BOARD B OPH158A(149H158A)(pcb 052H346A)
EP-11
R
Component side
5045-03A 5045-04A
siein GND
F12V GND SP
Foil side
EP-11 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 3 4 6
7 8 9 10 11 12 13 14 15 0 3 4 5 6 POWER BOARD-S PSH057A(146H057A)100V
PSH076A(146H076)117V PSH077A(146H077A)220/240V
| FUS | FUSE | |||
|---|---|---|---|---|
| 1007 | 117V | 220/240 V | HOLDER | |
| FlOl | MGP-1A | MGP-1A CSA | SEMKO T500mA | TF-758 |
|
Fl |
MGP-3A | MGP-3A CSA | SEMKO T1.6A |
220/
240V |
| F2, F3 | jumper | jumper | SEMKO T315mA | only |
110/1170
220V (240V)
| PARTS LIST | |||
|---|---|---|---|
| KEYBOARD | IC | ||
| 004H005 | SK361B | 1517921BO | M5L8049-055P Single-Chip 8-Bit Microcomputer |
| CASE |
151791
1
0
15169310 |
8253 Programmable Interval Timer
74LS42 One-Of-Ten Decoder |
|
|
081H245
072H104C 072H105 065H093 099H043 085H040 22410510 092H012 066H023/024 068H038 064H118 064H119 |
CabinetH245PanelH104CBlindH105GrilleH093Baffle clothH043Baffle boardH040SpeakerS10P18Music rackH012Side panelH023-L/024-RRubber capH038 side panelHolderH118HolderH119 |
15169330
15159116 15159120 15159121 15159303H0 15159105 15189105 15189136B0 15199507B0 15199106 15199114 |
74LS2598-Bit Addressable Latches4069UBHex Inverter4099B8-Bit Addressable Latch40175BQuad Type D Flip FlopHD14584Hex Schmitt Trigger4013BDual Type D Flip Flop4558Dual OP AmpM5218LOP AmpM51514ALPower Amp7805Three Terminal Voltage Regulator78L15Three Terminal Voltage Regulator |
| Rubber 100t G-7 | TRANSISTOR | ||
|
KNOB
016H045 016H053 |
HO45 rotary
HO53 slide |
15129114
151291080 A 15119601 |
25A1019-GR
2SC1815-GR 2SC945-P (NZ, selected) 2SB605-K |
| DUTTON | DIODE | ||
|
016H029
016H030 016H031 016H032 016H036 |
hythm)
H029 orange H030 yellow H031 green H032 blue H036 white |
15019103
15019208 15019243 15019245 15019619 15029103 |
1S-2473
1SR35-200 1B4B1 rectifier stack 1B4B41 rectifier stack 05Z-15L zener TLR-124 LED |
| (auto p | ay) | RESISTOR | |
|
016H037
016H038 016H039 016H040 016H044 |
H037 orange
H038 yellow H039 green H040 blue H044 white |
13829821
13910105 |
RM8-103K lOk x 8 array
RM8-223K 22k x 8 array |
| (tone s | elector) | 13569154 | COO9S-1H470J05 470pF polystyrepe |
|
016H033
016H035 |
H033 ivory
H035 gray |
13639261M0
13639201M0 13659213M0 |
ECEA50M010 luF/50V electro. M-type
ECEA50MR47 0.47µF/50V electro. M-type ECET25R472SW 4700µF/25V |
| SWITCH | POTENTIOME | TER | |
|
13149102
13169605 13129526 13129527 13159505 |
1801-0121 power
KEJ10901 SUT-52A-R SUT-52A-T tone selector EVA-A03C14ACA slide, vari |
13219402
13219240 (Slide) |
EVH-OTAS10B15 100kB tune
EVH-5XAP20A14 10kA volume |
| JACK | 13339411 | EVA-TOHC14B15 100kB sustain | |
|
13449211
13449210 13429608 |
HLJ-0259-01-030 mono
HLJ-0259-01-010 stereo DIN connector TCS0250-1-1 |
13339410
13339412 |
EVA-TOHC14A54 JOKB bass level, rhythm level
EVA-TOHC14A54 JOkA lower level EVA-TOHC14A26 2MA tempo |
| COIL, TRANSFO | RMER | (Trimm | |
|
12449221
022H048J 022H048C |
Coil 40M-067-018
PT-H048J 100V PT-H048C 117V |
13299129
13299130 |
EVN-42JAAOOB14 10kB
EVN-42JAAOOB15 100kB |
| 022H048D | PT-H048D 220/240V | 12559133 | MCP_14 prim 100V |
|
PCB ASSEMBLY
149H157A 149H158A 149H159A 149H159A 146H072A |
PANEL BOARD-A OPH157A (pcb 052H345A)
PANEL BOARD-B OPH158A (pcb 052H346A) JACK BOARD OPH159A (pcb 052H347A) CPU BOARD AGH024A (pcb 052H344A) POWER BOARD-P PSH072A (pcb 052H348A) 100V |
12559311
12559314 12559511 12559511 12559509 12559509 12559521 12559519 |
MGP-1A CSA prim. 117V
MGP-3A Sec. 100V MGP-3A CSA sec. 117V SEMKO T500mA prim. 220/240V SEMKO T315mA sec. 220/240V SEMKO T1.6A sec. 220/240V Fuse holder TF-758 |
|
146H075A
146H075A 146H075A 146H076A 146H077A |
POWER BOARD-P PSH073A (pcb 052H348A) 117V
POWER BOARD-P PSH074A (pcb 052H348A) 220/240V POWER BOARD-S PSH075A (pcb 052H349A) 100V POWER BOARD-S PSH076A (pcb 052H349A) 117V POWER BOARD-S PSH077A (pcb 052H349A) 220/240V |
OTHERS
048H017 048H021 A 12389800 |
Heat sink HO17
Heat sink HO21 Ceramic resonator CSA6MHz and paired CSC30pF |
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
| _ | |
|---|---|
| 1 | С |
| Y |
EP-11
P/
co
PCE
EP-11SERVICENOTES1992.07.02ERRATA & SUPPLEMENT正誤表 & 追加情報ER00055(Small errors are ignored.重要でないエラーは無視します。)
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