Roland EP-85 SERVICE MANUAL

Page 1

OP 00 SERVICE NOTES

ep-85

TABLE OF CONTENTS	Page
SPECIFICATIONS	1
DISASSEMBLY	1
LOCATION OF CONTROLS & REAR VIEW	2
EXPLODED VIEW	3
KEYBOARD PARTS LIST	4
STAND EXPLODED VIEW & PARTS LIST KS-9E	4
BLOCK DIAGRAM	5
MAIN PCB ASSY	6
CIRCUIT DIAGRAM MAIN PCB ASSY	7
PIANO MODULE PCB ASSY & CIRCUIT DIAGRAM	8
CONTROL PCB ASSY & CIRCUIT DIAGRAM	9
HEADPHONE PCB ASSY & CIRCUIT DIAGRAM	9
RIGHT CONTACT PCB ASSY w/RUBBER CONTACT & CIRCUIT DIAGRAM	10
LEFT CONTACT PCB ASSY w/RUBBER CONTACT & CIRCUIT DIAGRAM	10
PARTS LIST	11
IDENTIFYING VERSION NUMBER	12
TEST MODE	12/13
AUDIO TEST	13
FACTORY SETUP	13

SPECIFICATIONS

- Keyboard	88 keys, velocity sensitive
- Polyiphony	28 voices
- Sounds	8 selectable via dedicated front-panel b E.PIANO, VIBRAPHONE, HARPSICHOR CHOIR), 241 Tones + 9 Drums Sets (se	outtons (PIANO1, PIANO2, D, ORGAN, STRINGS, lectable via MIDI)
- Digital effects	Digital Chorus, Digital Reverb
- Recorder	Records and plays back note and pedal ges. 1 songs (±1000 notes)	data as well as tempo chan
-Tuning function	± 50 cents (TUNE knob)
- Controls	VOLUME slider (global volume), Pianist Music Style selection buttons (Ballad, F BossaN, Rock'N Shuffle, Sl Rock, Latin METRONOME (on/off) button, INTRO/E TRANSPOSE ▲/▼ buttons, KEY START/ PLAY/DEMO buttons, Tone selection bu E.Piano, Vibraphone, Harpsichord, Orga REVERB buttons (Rear panel), TUNE k	: VOLUME ▲/▼ buttons, Pop, SI Swing, Swing, , SI Waltz, Rag Time), NDING button, TEMPO/KEY STOP button, Recorder REC ttons (Piano1, Piano2, an, Strings, Choir), CHORUS nob.
- Finish	Stage-piano look (black)
- Connectors	DC 12V / 1700mA (for ACJ/ASA adapto	r), MIDI IN/OUT connectors,
	Pedal DAMPER & SOFT jacks, INPUT (	L/Mono, R) jacks, OUTPUT
	(L/R) jacks,2 X PHONES jack (front sid	e)
- Speakers	12cm x2
- Output power	5 W x2
- Dimensions	1326 (W) x 382 (D) x 114 (H) mm
-Weight	15 Kg. (without AC- Adaptor)
- Power consumption	1700mA (DC 9V)
-Supplied accessories	DP-6 footswitch pedal
••	Owner's. Manual (I/SP/DUTCH) EP85/95	(K6018264)
	Owner's. Manual (E/D/F) EP85/95	(K6018265)
	MIDI Guide	(K6018109)
	Music Rest	(22195654KK)
	Power Adaptor ACJ 120V (117V)	(22448612)
	Power Adaptor ACJ 230V (230V)	(2244861101)
	Power Adaptor ACJ 230VE (230VE)	(2244861001)
	Power Adaptor ACJ 240VA (240VA)	(22448614)
- Options	Headphones: RH-120, RH-80, RH-20
	Footswitches (pedals): DP-2,DP-6
	KS-9E Keyboard stand

Page 2

LOCATION OF CONTROLS

Page 3

EXPI	LO	D	E	D	V	IE'	W

NO	PARIS NAME	PARIS NUMBER
1	VARNISHED BOTTOM CABINET	7698804000
2	SPACER 3M ART. SJ5012	J2359101
3	MAIN BOARD PCB ASSY	7698801000
4	VARN+SILK. SOCKET SUPPORT	7698805000
5	SPEAKER 4 OHM 120.20B/FX	K2418103
6	CONTROLS PCB ASSY	7698802000
7	VIBRATION DAMPER K600	K2268145
8	OVAL DIFFUSER F/4 LINEAR LEDS	K2238117
9	VARN+SILK. TOP CABINET	7698803000
10	GRILL F/LOUDSPEAKER	K2248125
11	HEADPHONES PCB ASSY	7695902000
12	MUSIC STOPPER	K2238113
13	88-KEY TP8P KEYBOARD ASSY	7698908000
14	MUSIC REST	22195654KK
15	HEADPHONES FIXING BASE	K2128105
16	ROT.POT. 10KB 90° MONO	13279884
17	DIN SOCKET MG/PR 5L	13429664RI
18	JACK SOCKET HLJ0520-01-110	13449125
19	SWITCH SDDWA-1401A	13129135
20	DC SUPPLY SOCKET HEC 2305-01-230	13449726
21	JACK SOCKET YKB 21-5006	13449252
22	SELF TAP.SCREW 3.5x19 TCTCPRBZ	J2289128
23	SCREW 2.9x10 TCTCPR TROP	J2289125
24	SELF TAP.SCREW 3.5x9.5 TCPRTFR	J2289115
25	SCREW 2.9x13 TCTCPR TRP	J2289130
26	2P COAXIAL CBL ASSY (28) -2C	7698905000
27	6-CBL ASSY (56) -C1+1 P.2	7695908000
28	4P CABLE ASSY (28/106) (W/4PC)	K3468160
29	20P FLAT CABLE (36) -2C	K3468161
30	20P FLAT CABLE (56) -2C	K3468162
31	16P FLAT CBL (42) W(16PC-16PC)	7627102001

Page 4

Mar, 1997

KEYBOARD PARTS LIST 88 KEY TP8 KEYBOARD ASSY

Ref	PARTS NAME	PARTS NUMBER	n.
1	KEY SPRING gr.63	J2179102	88
	NATURAL KEY A (gr.10) TP/8P LA(I)	J2579141	1
	NATURAL KEY C (gr.10) TP/8P DO	J2579142	7
	NATURAL KEY D (gr.10) TP/8P RE	J2579143	7
	NATURAL KEY E (gr.10) TP/8P MI	J2579144	7
2	NATURAL KEY F (gr.10) TP/8P FA	J2579145	7
	NATURAL KEY G (gr.10) TP/8P SOL	J2579146	7
	NATURAL KEY A (gr.10) TP/8P LA	J2579147	7
	NATURAL KEY B (gr.10) TP/8P SI	J2579148	8
	NATURAL KEY A (gr.10) TP/8P DO	J2579149	1
3	SHARP KEY (gr.10) TP/8P	J2579150	36
4	SELF TAP SCREW 2.9x8 TCTCPRBZ	J2289126	48
5	12P RUBBER CONTACT	22185238	1
6	13P RUBBER CONTACT	22185239	7
7	LEFT CONTACT PCB ASSY+RUBBER	7698904000	1
8	RIGHT CONTACT PCB ASSY+RUBBER	7698903000	1
9	88-KEY KEYBOARD CHASSIS TP/8P	J2819104	1
10	GUIDE BUSHING INFERIOR	J2359104	88
11	GUIDE BUSHING SUPERIOR	22158789	88
*	CONTACT BOARDS ARE COMPLETE WITH	RUBBER CONTACTS	-

STAND EXPLODED VIEW & PARTS LIST KS-9e

No	PARTS NAME	PARTS NUMBER
1	LEFT SIDE FRAME	K1128102
2	RIGHT SIDE FRAME	K1128101
3	REAR CROSS BAR 1132 MM	K1148107
4	FOOT FOR SIDE FRAME	K2358101
5	KEYBOARD HINGE CHASSIS	K2128113
6	CHASSIS FOR BAR	K2128114
7	HINGES F/HEADPHONES	22325414
8	SCREW M6x40 TC BURNISHED H.15	K2288101
	SCREW DRIVER TYPE 2	J2329101
	RIGHT POLYST. END-SIDE	K2638134
	LEFT POLYST. END-SIDE	K2638135
	MIDDLE POLYST. END-SIDE	K2638136
	POLYETH. ENVELOPE 25x45	K2678102
	OUTER PACKING KS-9E	K2618129
	CARTON PLATE 1440x440 MM	K2668102
	KS-9E MOUNTING SCHEME	K6018153

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sistered a

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Page 7

ep-85

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ep-85

Mar. 1997

Page 9

View from component side

CIRCUIT DIAGRAM (HEADPHONES PCB ASSY)

Page 10

Page 11

PARTS LIST EP-85 (117V/230V/230VE/240VA)

SAFETY I		CONSIDERATION ON F When ordering any parts listed in OTY PART	PARTS ORDERING the parts list,please specify the follo T NI IMBER	owing items in the order sheet.	DIODE	15129136	TRANSISTOR	2SC-2878-A/B	Q7/Q10 on MB
Use only replaceme	listed parts for ent.	Ex. 10 22 15 224 Failure to completely fill the abov even undelivered replacement.	2575241 Sharp Ke 47017300 Knob (oran re items with correct number and des	y C-20/50 ge) DAC-15D scription will result in delayed or		15019159RI	DIODE	1N-4148	All on CB, All on RCB, All on LCB, D3/D9, D11
NOTE : Tr << EMI >> : RCB = Righ LCB = Left	The parts marked "#" ar The parts marked A Use only listed parts for : Component for EMC. ht Contact Board P Contact Board C	e new (Initial Parts). have Safety - Related characteristics. replacement. HB = Phones Board B = Control Board				15339114 15029320RI 15029284RI J5019101 15019332RI J5019105 15091172BI	DIODE LED DIODE LED DIODE ZENER DIODE ZENER DIODE DIODE	RB420D T146 TLHG4401 - GRE TLHR4401 - REE BZX79C 4V7 BZX79C 6.2V IN-4002 BY 251	on MB D1 on PMB EEN D2,7,8,17, on CB All on CB D12, D13 on MB D2 on MB D1 on MB D10 on MB
PMB = Piar	no Modole Board N	IB = Main Board			RESISTO	R	DIODE	BT 231	DTO ON ME
-ASING #	7698803000	VARN+SILK. TOP CABINE	ET EP-85			15399917	CHIP RES. ARRAY	4X 10K E/U	RA8 on PMB
# # ASING	7698804000 22195654KK K2238113 K2248125	VARNISHED BOTTOM CA MUSIC REST MUSIC STOPPER GRILL F/LOUDSPEAKER	NBINET EP-85			15399932 J3919104 13819132Ri 13819131Ri J3809129 J3809139	CHIP RES. ARRAY CHIP RES.ARRAY UNINFL.RES. UNINFL.RES. UNINFL. RES. OXIDE RESISTOR	4X100 E/U 2512 8X10 K +2C 100 OHM 0.6W 5 10 OHM 0.6W 5 220 OHM 0.6W 5 2.2 OHM 3W	RA4 on PMB C RA1,2,3,5,6,7 on PMB 5% R2,3,4,5 on CB % R1 on CB 5% R51 on MB R21 on MB R21 on MB
#	7698805000	VARN+SILK. SOCKET SU	PPORT		POTENTI	OMETER
		HEADPHONES FIXING BA	ASE EP-/I	E		13279884 13359364	ROT.POT. SLIDER POT.	10KB 90ø MONC NNB-X10-B14	VR1 on MB VR1 on CB
	K2478200	BUTTON GROUP	22X8+DIFFBLACK		CAPACIT	OR
# #	K2478201 K2478203 K2478252 K2478253 22488183 22485192	BUTTON GROUP BUTTON GROUP 4-BUTTON GROUP+DIF 4-BUTTON GROUP+DIFF. POWER SWITCH KNOB N BLACK KNOB W/WHITE IN	15X8 +DIFF.(BLACK) (4) 15X8 -BLACK- 22X8 (GREY) 15X8(RED) 1.001-BLACK NDICATOR			J3519117 13529147RI J3629144 13649668RI 13639154 J3629134 13639651RI	CERAM.COND. CAPAC.ARRAY ELCTRL.COND. ELECTRL.CONDY ELECTRL.CONDY ELECTRL.CONDY	4.7N 25V 20% 8X100 PF 470UF 16V AX 47UF 25V / 1000UF 16V / 2200UF 16V / 2200UF 26V	C39 on MB CA1 on MB C4 on CB C5 on CB C24, C27 on MB C5, C9 on MB C1 on MB
WITCH	1312975301		R 160 All on			13649662RI	ELECTRL.CONDV	/ 3300UF 25V	C58 on MB
	13129135	SWITCH SDDWA-1401A	SW2	on MB		J3629103	ELECTROL.COND.	22U 25V P5	C2,23,26,29,35 01 MB C4, C8 on MB C6 10 22 44 56 57 60 61 on MP
ACK, SO	CKET	Tele March March				J3629104 J3629105	ELECTRL.COND.	47U 50V P5	C3,7,10,26,30,32 on MB
	13449726 13449252 13449125 13429664RI	DC SUPPLY SOCKET F JACK SOCKET Y JACK SOCKET F DIN SOCKET M	HEC 2305-01-230 JK2 c YKB 21-5006 JK1, c HLJ0520-01-110 JK5/J MG/PR 5L JK3, c	n MB JK2 on PHB K10 on MB JK4 on MB		J3629106 J3629107 J5369101 13649103J0 13659306	ELECTRL.COND. ELECTRL.COND. ELECTR. COND. UNPOL.COND. SPEC. COND.	4.70 637 F5 1UF 100V P5 22U 16V (SMD) 10U 16 P5 0.047F 5.5V BAD	C20,21,31 on MB C22,43,45,48,49,50,80,81 on MB C12,13,14,15,55 on PMB C71,72,74,75,77,78 on MB C57 on PMB
PEAKER					INDUCTO	R, COIL, FILTER
	K2418103	SPEAKER 4 OHM 120.20B	3/FX		< >	12449370	NOISE SUP.	SBT-0160W	L3, L8, L9, L11 on MB
EYBOAR	7608008000				< >	13529187	NOISE SUP.	ELKTR391CA	FL1,FL3/FL9 on MB
# `B 499V	NOTE :For detail	s, refer to KEYBOARD PART	TS LIST (Pag.4)		< > < > < >	12449382 12449380 J2399101	NOISE SUP. NOISE SUP. NOISE SUP.	EXC-ELDR25V BL03RN2-R62T2	L1 on MB L2, FL2, L7,L10,L12/L15 on MB L1/L6 on PHB
70 A001	7695902000	HEADPHONES PCB ASSY	1		CRYSTAL	, RESONATOR
# E #	7698802000 7698801001	CONTROLS PCB ASSY MAIN BOARD PCB ASSY	EP-85 EP-85	5		15299180	QUARTZ	24 MHZ	X1 on PMB
# #	7698903000 7698904000	RIGHT CONTACT PCB ASS LEFT CONTACT PCB ASS	SY W/RUBBER Y W/RUBBER		CONNEC	13419677BI
# #	15229718RI K525813210 K525813010 K525813410	I.C. 6N 137 I.C. K525813210 I.C. K525813010 I.C. HD6435328RW21F	PHOTO-COUPLER MASK ROM MASK ROM FLAT	IC6 on MB IC6 on PMB IC7 on PMB IC3 on PMB		133696888RI 133696888RI J3439103 J3439117 J3439120	20P FEM. CON 4P MALE CON 6P MALE CON 6P MALE CON 4P MALE CON	NECTOR AMP 1.27 NN. P 2.5 M NN. P 2.5 M NN. 900 P. 2.5 NN. 92 M	CN2,CN3 on PMB, CN1 on RCB, CN1 on LCB CN1 on MB CN3 on MB CN2 on CB CN2 on RCB, CN2 on LCB
	15169550RI 15259886	I.C. 74 HC138 I.C. 74 HCU 04	DIP CMOS CMOS SMD	IC3 on CB IC1 on PMB		J3439121	6P MALE CON	IN. P.2 M	CN4 on MB, W4 on PHB
	00129278 J5259110	I.C. SSC1080 FOB	(CUSTOM IC)	IC11 on PMB	WIRING, O	CABLE
	15239229 15259884 15259883 15259887 15219183 15199559RI 15199560RI 15189251	I.C. TC6116-GP4 I.C. TC7S08F MOS I.C. TC7S00F TE85L I.C. TC7SU04F FLAT I.C. M51953 A STANDING I.C. TD 62506P I.C. TD62305AP I.C. M5218 P	(CUSTOM IC) CMOS CMOS CMOS (RESET IC) (INTERF.DRIVER IC) (INTERF.DRIVER IC) (OP AMP)	IC4 on PMB IC5 on PMB IC12 on PMB IC13 on PMB IC4 on MB IC1 on CB IC2 on CB IC2 on MB	#	7698907000 7698905000 7695908000 K3468160 K3468161 K3468162	4P CABLE ASSY 2P COAXIAL CBL A 6-CBL ASSY 4P CABLE ASSY 20P FLAT CABLE 20P FLAT CABLE	(6) -2C P.2 (56) -2C (28/106) (W/4PC) (36) -2C (56) -2C	CN2 on RCB to CN2 on LCB CN3 on MB to CN2 on CB CN4 on MB to W4 on PHB CN1 on MB to Speaker CN3 on PMB to CN1 on RCB CN2 on PMB to CN1 on
	15289702 15199197RI 15199550RI	I.C. UPD6376 I.C. UA 7805 SCNC I.C. TDA 1905	DAC REGUL.(+5V) (POWER AMP)	IC3 on MB IC5 on MB IC1,IC2 on MB	000514	7627102001	16P FLAT CBL	(42) W(16PC- ^-	LCB 16PC) CN2 on MB to CN1 on CB
ANSIST	OR		(, ,		SCREW	J2289122	SELF TAP.SCREW	2 2X 6 TC TC
	15119155RI J5119101 15119154RI	TRANSISTOR TRANSISTOR TRANSISTOR	BC/560-B BD 371 C BC/549-B	Q1 on CB, Q4,13 on MB Q3 on MB Q1,2,5,6,11,12 on MB		J2289121 J2289125 J2289130	SELF TAP. SCR. SCREW SCREW	2.2X10 C.C 2.9X10 TC TC PF 2.9X10 TC TC PF	R TROP R TROP

DAOKING	J2289128 J2289108 J2289109 J2289115 J2289112 J2289113 J2139102 K2168102 J2359101	SELF TAP.SCREW SELF LOCK.SCREW SELF LOCK.SCREW SPEC.SCREW NUT TOOTHED WASHER SPACER FOR LED SPACER 3M	3.5X19 TCTCPF M3X10 TCTC H M4X14 TCTC H, 3.5X9.5 TCPRTF 3.5X12 TCTC TS 3MA H.3 I/D 3 H.2.8 D.E. 5.5 ART. SJ5012	BZ .6 9.5 R H.8
PACKING
#	K2638169 K2638170 K2678116 K2618178	RIGHT POLYST. END-SIDE LEFT POLYST. END-SIDE CARTENE ENVELOPE OUTER PACKING	HD 70X190	EP-85 EP-85 EP-85
MISCELL	ANEOUS
#	22248470 K2268128 K3468138 1342982301 K2238117 K2268145	ANTI-DUST COVER RED FELT COPPER STRIP POWER SUPPLY SOCKET OVAL DIFFUSER VIBRATION DAMPER	HOLDER Nø 2	PL30N MM. 1250X7X1 0.2X20X70 MM. 2H. F/4 LINEAR LEDS W300N (BLACK)
ACCESSO	DRIES
# #	K6018109 K6018264 K6018265 J3059103 22448612 2244861101 2244861001	MIDI GUIDE OWNER'S MANUAL (I/SP/E OWNER'S MANUAL (E/D/F DP-6 FOOTSWITCH PEDA POWER ADAPTORACJ 120 POWER ADAPTORACJ 230 POWER ADAPTORACJ 230	DUTCH) ) L (PEDAL W/CAB )V DV DVE	EP85/95 EP85/95 LE) (117V) (230V) (230VE)
⊿∆	22448614	POWER ADAPTORACJ 240	)VA	(240VA)

Page 12

IDENTIFYING THE SOFTWARE VERSION

Press "E Piano 3" while switching ON the instrument.

• •	0 0	0 •	•••	Soft.Ver.=1.00
00	• •	● ●	•••	Soft.Ver.=1.01
• •	00	•	•••	Soft.Ver.=1.02
• •	•	•	••	Soft.Ver.=1.03

The software version will be indicated by the tone leds on the control panel as shown above. To exit, switch the power off.

TEST MODE

Switch the instrument on while holding down the "Piano 1" button. In the model EP-85, the "Pop" button led turns on.

The leds of all the tone buttons blink until one the following possible checks is selected.

The TEST MODE includes 9 tests:

1) Piano1	Test Switch +Led
2) Piano 2	Test Pedal (or Audio test if pressed while switching on the imstrument).
3) E.Pia.1	Test Keyboard
4) Vibr.	Midi
5) Harp.	Ram
6) Organ	W Rom
7) String	Rom Program
8) Choir	Adc
9) Effect	Reverb
	Chorus

To exit, press the "Start" and "Choir" buttons simultaneously.

1) Switch and Led test

Press the "Piano1" button and all leds turn on.

When pressing each single button, you can hear a metronome beat while the corresponding button led lights. When pressing the buttons whithout leds, like TEMPO +/- and VOLUME +/-, the beat leds will turn on from left to right depending on the button you' ve pressed. Once all leds turn off, after checking all the corresponding buttons, the test is completed. You cannot exit this test mode before completing this check.

To exit press "Start" + "Choir" buttons simultaneously

2) Pedal test

Press "Piano2", connect the "Soft" and "Damper" pedals to the instrument.

When pressing the "Soft" pedal you'll hear a sound and the first led on the left of the tempo indicator will turn on.

When pressing the "Damper" pedal you'll hear a sound and the last led on the right of the tempo indicator will turn on.

To exit press "Start" + "Choir" buttons simultaneously

3) Keyboard test

Press the "E.Piano" button.

When pressing a key, a sound is generated; the key velocity level is shown by the leds on the control panel, since they turn on in sequence one after another depending on the velocity level, starting from level 1 (= the led on the "Piano" button turns on), up to 127, the highest level (= the "Choir" led turns on)

To exit press "Start" + "Choir" buttons simultaneously

4) Midi test

Press the "Vibraphone" button.

Shortcircuit the Midi IN/OUT sockets on the rear panel by using a MIDI CABLE.

If the "Play" button led lights, it's OK.
If the "Rec" button led lights, there's an ERROR.
The error cause, is: either a wrong transmission/reception, or that the MIDI CABLE was not connected correctly.

To exit press "Start" + "Choir" buttons simultaneously

5) Ram test (IC2 on Piano Module)

Press the "Harpsichord" button.

If the "Play" button led lights, it's OK.
If the "Rec" button led lights, there's an ERROR.
The error cause, is: something wrong either in the RAM (IC2 on Piano Module), or in the circuit.

To exit press "Start" + "Choir" buttons simultaneously

6) Wave Masked Rom test (IC7 on Piano Module)

Press the "Organ" button.

- If the "Play" button led lights, it's OK.

- If the "Rec" button led lights, there's an ERROR.

The error cause, is: something wrong either in the WAVE ROM (IC7 on Piano Module), or in the cir cuit.

To exit press "Start" + "Choir" buttons simultaneously

7) Programmed Masked Rom test (IC6 on Piano Module)

Press the "Strings" button.

If the "Play" button led lights, it's OK.
If the "Rec" button led lights, there's an ERROR.
The error cause, is: something wrong either in the PROGRAMMED ROM (IC6 on Piano Module), or in the circuit.

To exit press "Start" + "Choir" buttons simultaneously

8) Adc test

Press the "Choir" button to enter the Adc test mode (Tune/Volume)

Page 13

MASTER TUNE TEST

The "Piano1" and "Piano2" buttons blink, press "Piano1" and its led will light while the "Piano2" led turns off.

- When closing the "TUNE " potentiometer towards the " b " symbol, a falling sound can be heard; - when opening the "TUNE " potentiometer toward the " # " symbol, an increasing sound can be heard Each end position is signalled by a metronome beat.

To exit press "Start" + "Choir" buttons simultaneously

MASTER VOLUME TEST

When moving this potentiometer from "MAX" to "MIN", the general volume dicreases till no sound can be heard.

When moving the potentiometer from "MIN" to "MAX", the general volume reaches its highest level.

To exit press "Start" + "Choir" buttons simultaneously.

9) Effect test (IC8 on Piano Module)

Press the "Chorus" button, you'll hear a sound with the chorus effect. Press "Reverb", you'll heard a bassdrum tone and the metronome beats with reverb effect.

To exit press "Start" + "Choir" buttons simultaneously.

Audio test

Switch the instrument on while keeping the "Piano2" button pressed. You'll hear a hight frequency sound from the left speaker and a low frequency sound from the right speaker.

To exit, switch the instrument off.

Factory Setup

After finishing the checks, switch the instrument on while keeping the "REC" button pressed.

Both the "REC" and "PLAY" leds blink for a few seconds, this confirms the program has been reset.