Roland EP-30 Quick start guide

ROLAND ELECTRONIC PIANO MODEL EP-30
TOUCH RESPONSE TYPE
ROLAND PIANO
SERVICE NOTE
THE FIRST EDITION
Roland Corporation

INDEX
1. SPECIFICATIONS . 2
2. GENERAL BLOCK DIAGRAM . 3
3. CABINET DISASSEMBLING . 4
4. LOCATION OF THE CIRCUIT BOARD ASSEMBLIES . 5
5. PARTS LAYOUT X, CIRCUIT DIAGRAM . 6
5-1. MASTER GENERATOR . 6
5-2. DIVIDER. 8
5-3. GATE .10
5-4. VOICING FILTER & AMPLIFIER. 12
5- 5. POWER SUPPLY. 14
6. ALIGNMENT PROCEDURE . 16
6- 1. ADJUSTMENT FOR GATE CUTOFF. 16
6-2. ADJUSTMENT FOR DYNAMIC RANGE OF TOUCH SENSITIVITY
.16
6-3. ADJUSTMENT FOR MASTER GENERATOR . 17
6-4. ADJUSTMENT FOR DEGREE OF TREMOLO MODULATION ... 18
7. GENERAL SCHEMATIC DIAGRAM . 21
8. STANDARD WAVE-FORMS Xc VOLTAGES ON THE CIRCUITS ... 23
9. PARTS LIST . 25

ROLAND
PIANO
MODEL EP-30
SPECIFICATIONS
Keyboard
Changeover Switches
Tone Selectors
61 Keys(5 Octaves t FI - F6)
PIANO
I
PIANO
II
HARPSICHORD I
HARPSICHORD II
BASS Changeover Switch
VIBRATO Switch
Control Knobs ...6
Main VOLUME (with SENS.-OFF Switch; Pull the Main
VOLUME knob, and touch-sensitivity will
be OFF.)
TONE Control
BASS Volume
VIBRATO RATE
VIBRATO DEPTH
PITCH Control
OUTPUT Jack (high impedance) . 1
PEDAL Jack (for DP-l) . 1
PHONES Jack (for Headphones of general stereo amplifier).1
POWER Switch
Pilot Lamp
AC Voltage
Power Consumption
Dimensions
Weight
Accessories
s 100V, 117V, 220V, 250V, 50/60HZ
: 10VA
: 900(W) x 300(D) x 150(H)mm
(35•4(W) x 11.8(D) x 5.9(H)inch)
* 14-5Kg(31.9Lbs)
: Music Rack. 1
Pedal Switch(DP-l).1
Connection Cord 2.5m. 1
(with Pin-Plug Adaptor)
* OUTPUT VOLTAGE
SENS. ON SENS. OFF
PIANO
1.8Vp-p max. 0.9Vp-p max
HARPSICHORD
2.4Vp-p max. 1.2Vp-p max
BASS(VR max.)
5.0Vp-p max.
2.5Vp-p max
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

SENS.
OFF
SWITCH
61
KEYS
KEYBOARD

3. CABINET DISASSEMBLING (Pig. 2)

4. LOCATION OP THE CIRCUIT BOARD ASSEMBLIES
VOLUME
SIDE
block:
POWER TRANSFORMER DIVIDER BOARD ASSEMBLIES
- 5 -
(Pig- 5)

5. PABTS LAYOUT & CIRCUIT DIAGRAM
5-1. MASTER GENERATOR
5-l(a) MASTER GENERATOR BOARD ASSEMBLY (AG-997)
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5-l(b) MASTER GENERATOR CIRCUIT DIAGRAM (Fig. 8)

Only on DV-999.
- 9 -

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ASSEMBLIES H Q J
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60 48 36 24 12
59 47 35 23 11
58 46 34 22 10
57 45 33 21 9
56 44 32 20 8
55 43 31 19 7
54 42 30 18 6
53 41 29 17 5
52 40 28 16 4
51 39 27 15 3
50 38 26 14 2
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5-4. VOICING FILTER 8c AMPLIFIER
5-4(a) VOICING FILTER 5c AMPLIFIER BOARD ASSEMBLY!FL-999) (Fig. 13)

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5-5* P0 WER SUPPLY
5-5(a) POWER SUPPLY BOARD AS SEMBLY( P C-999)
- 14 -

5-5(t>) POWER SUPPLY CIRCUIT DIAGRAM (Pig- 16)
- 15 -

6. ALIGNMENT PROCEDURE
6-1. ADJUSTMENT FOR GATE CUTOFF
1) Setting
Main VOLUME .Max.
TONE Control.Max.
HARPSICHORD II.ON
Other Controls.OFF
* To connect with a headphone or a guitar amplifier etc.
2) Procedure
While non-depressing a key, leakage signal sound Yia the gate
is audible only.
Connect a D.C. voltage meter to the 32nd terminal on the Gate
Circuit Board assembly.
Adjust the Cutoff adjustor(semi-fixed resistor) on the Board
GT-991 so that voltage of the 32nd terminal against the earth
may reach about -0.34V.
When it is less than -0.34V, the leakage signal will increase.
And conversely more than —0.34V, the sound-envelope will become
short.
As these standard values fluctuate a little in accordance with
the quality variations of products, find the condition that the
sound-envelope will not become short unnaturally and the leakage
signal is minimum.
Notice
The cutoff voltage -0.34V is approximate value.
6-2. ADJUSTMENT FOR DYNAMIC RANGE OF TOUCH SENSITIVITY
For adjusting dynamic
range of toueh sensitiv¬
ity.
(Fig. 17)
- 16 -

1) Set the Main VOLUME and the TONE Control at the proper position
in accordance with an amplifier or a headphone used#
2) Push the Tone Selector PIANO II.
3) Connect the @terminal of D.C. voltage meter to the 4th terminal
of Power Supply Board, and connect the 0 terminal of D.C. voltage
meter to the 6th terminal of the board.
4) Adjust the Dynamic Range Adjuster( semi-fixed resistor) on the
Power Supply Board so that the voltage difference between the 4th
and the 6th terminal may reach about 13V.
5) For EP-30, signal level difference(Dynamic Range) is set at about
20dB.
Here, signal levels are max. signal by Fortissimo depressing key
and min. signal by Pianissimo depressing key. And this measure is
satisfied when the voltage difference between abovementioned
terminal the 4th and the 6th is at about 13V.
In case of the voltage difference is under 13V.
Fortissimo playing is difficult to be done.
In case of the voltage difference is over 13V.
Pianissimo playing is difficult to be done.
The Dynamic Range fluctuates a little in accordance with the qual¬
ity variations of products.
So, set the Dynamic Range Adjuster(semi-fixed resistor VR601) at
the position where Fortissimo playing and Pianissimo playing can
be done easily.
The voltage difference 13V is approximate value.

Setting
1) Set the PITCH Control knob at the center position.
2) Make the VIBRATO Switch OFF.
Count the frequency which appears in the 14th terminal on the
Master Generator Board, using a digital frequency counter.
Adjust LI by the nonmetallio driver so that the frequency may
come to 1760Hz. And check the operation of PITCH Control.
In case of max. counterclockwise turning of the PITCH Control
knob.
The frequency is about 1744Hz.
In case of max.clockwise turning of the PITCH Control knob.
The frequency is about 1776Hz.
6-4. ADJUSTMENT FOR DEGREE OF TREMOLO MODULATION
EP-30 can produce both vibrato and tremolo effects simultaneous¬
ly. The Modulation Oscillator is mounted on the Voicing Filter
and Amplifier Board Assembly, and the oscillation wave-form is
sine wave having about lOVp-p wave-form height.
The oscillation frequency is varied in the region of about 3Hz -
8Hz.
The Vibrato effect is obtained, giving the Master Generator the
frequency modulation via the Vibrato Switch.
The Tremolo effect is the amplitude modulation via FET(Q507)»
For EP-30, the Vibrato Circuit will not be adjusted,and the Trem¬
olo Circuit will be adjusted only.
See the voltage wave-form between the Gate of FET(Q507) and the
earth by a synchroscope in D.C. range.
Adjust the semi-fixed resistor VR501 so that the output voltage
- 18 -

of Modulation Oscillator may reach about 2Vp-p.
Adjust the semi-fixed resistor VR502 so as to get the vias voltage
as about -2V.
There are quality variations of FETs. So, the vias voltage -2V is
approximate value.
Set the Main VOLUME and the TONE Control at a proper position for
the performance.
Make the Tone Seleotor PIANO I and the VIBRATO switch ON.
And set the VIBRATO DEPTH Control knob at the center position.
Fix VR502 at the position where the best tremolo effect can be
obtained.
- 19 -