Roland EP-77 Service Notes
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Roland EP-77 Service Notes

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  • Page 2: Location Of Controls

    Damper Soft Power 1000 mA Mono Mono Use Roland ACO Adaptor Only Stereo Stereo "THIS CLASS (B) DIGITAL APPARATUS COMPLIES WITH CANADIAN INTERFERENCE-CAUSING EQUIPMENT REGULATIONS" THIS DEVICE COMPLIES WITH PART 15 OF FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS:(1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2)THIS DEVICE MUST ACCEPT "CET APPAREIL NUMERIQUE DE LA CLASSE (B) RESPECTE LE...

  • Page 3: Exploded View

    EP-77 Dec, 1999 EXPLODED VIEW No. Part No. Description 7711507000 VARN+SILK. TOP CABINET K2248125 GRILL F/LOUDSPEAKER 7711508000 VARN+SILK. SOCKET SUPPORT K2198107 PLASTIC MUSIC REST 7711501000 MAIN PCB ASSY 7711502000 CONTROL PCB ASSY 7711503000 BEAT & TEMPO PCB ASSY JACK PCB ASSY...

  • Page 4: Part List

    GUIDE BUSHING SUPERIOR 22158789 1P CONDUCTIVE RUBBER LR 13/1 7625920000 CONTACT BOARDS ARE COMPLETE WITH RUBBER CONTACTS CONTACT BOARDS ARE COMPLETE WITH RUBBER CONTACTS STAND EXPLODED VIEW & PARTS LIST (KS-EP-77) PART LIST Part No. Description K1128121 RIGHT SIDE FRAME...
  • Page 5 Dec, 1999 EP-77 PARTS LIST EP-77 (117V/230V/230VE) SAFETY PRECAUTIONS : CONSIDERATION ON PARTS ORDERING 15189189 I.C. UPC 4570HA VERT. (OP.AMP.) IC7 on JB When ordering any parts listed in the parts list,please specify the following items in the order sheet.
  • Page 6 EP-77 Dec, 1999 PARTS LIST STAND KS-EP-77 WIRING, CABLE K3468211 CABLE (100) From CN4 on JB to SPEAKERS CASING Q.ty K3468159 16P FLAT CABLE ASSY (72) From CN5 on MB to CN1 on LCB K3468162 20P FLAT CABLE (56) From CN6 on MB to CN2 on RCB...

  • Page 7: Block Diagram

    EP-77 Dec, 1999 BLOCK DIAGRAM BEAT & TEMPO BOARD CONTROL BOARD TEMPO LED+SW MASTER BEAT VOLUME MATRIX VR101 SW116 MIDI OUT MIDI IN INPUT OUTPUT Note L(MONO) DAMPER SOFT Mass Production Develop.-Pre Product. IC5,IC7 IC10 AD BEAT 4M-MASK SRAM 4M-FLASH...
  • Page 8 EP-77 Dec, 1999 PHONES PCB ASSY & CIRCUIT DIAGRAM ASSY 7711504000 YKB21-5078 R1 100I 53014-0710 R2 100I AGND 100/16 L+ SEND-H L- SEND-H R+ SEND-H R- SEND-H L+ SPK 100/16 R4 100I L- SPK R5 100I To JACK/AMP BOARD (CN3)
  • Page 9 EP-77 Dec, 1999 CIRCUIT DIAGRAM (JACK PCB ASSY) D+5V YKF51-5054 1SS133 FBR07HA850TB-00 IC1C D+5V IC1D HD74LS04P HD74LS04P DAMPER DTA114ES 10nF HLJ7101-01-3010 IC1E 1SS133 IC1A HD74LS04P HD74LS04P 100nFC IC1F IC1B HD74LS04P HD74LS04P 1SS133 FBR07HA850TB-00 1SS133 D+5V SOFT D+5V D+5V 1SS133 HLJ7101-01-3010...
  • Page 10 EP-77 Dec, 1999 BEAT & TEMPO PCB ASSY & CIRCUIT DIAGRAM ASSY 7711503000 R109 R110 R111 R112 VREF R114 R113 C109 CN103 100nF C108 53015-0410 0.33/63 BEAT TEMPO AD-BEAT AD-TEMPO SW116 VR101 R115 RK11K1140 SRBV15-F0820-11 C110 To CN4 Main Board...

  • Page 11: Circuit Diagram (Main Pcb Assy)

    EP-77 Dec, 1999 CIRCUIT DIAGRAM (MAIN PCB ASSY) BATTERY Backup RB420D IC2C TC7W00F IC2B TC7W00F XRES XRAM XCS7 I/O8 IC2A I/O7 TC7W00F I/O6 I/O5 I/O4 I/O3 I/O2 I/O1 MODE0 MODE1 FLASH CT1 FLASH CT0 RN2421 1.5k XRAM XHWR HM62256LF P -7T...
  • Page 12 EP-77 Dec, 1999 CONTROL PCB ASSY & CIRCUIT DIAGRAM ASSY 7711502000 View from component side LED101 C101 TLHR-4401 100nF POWER CN101 C102 R101 100/16 IC101 53014-1010 Q101 TC74HC138P LED102 RN2227 D101 D102 D103 TLHR-4401 1N4148 1N4148 1N4148 SCAN C SCAN B...
  • Page 13 EP-77 Dec, 1999 LEFT CONTACT PCB ASSY w/RUBBER ASSY 7695005000 View from component side RIGHT CONTACT PCB ASSY w/RUBBER ASSY 7695004000 View from component side CIRCUIT DIAGRAM (LEFT CONT.PCB ASSY) CIRCUIT DIAGRAM (RIGHT CONT.PCB ASSY)
  • Page 14 | Device Check | --> | Error Display | Metro +--------------+ +---------------+ Play +-----------------+ |[Demo] | Version Display | <---------+ And now, you can find out ep-77 by checking Cho/Rev LED. +-----------------+ |[Demo] ep-77 Chorus LED +------------------+ Reverb LED | Button/LED Check | +------------------+ Press the [Demo] button, then you can go Button/LED Check.
  • Page 15 EP-77 Dec, 1999 5. Tempo & Beat Check (A/D) Tempo Knob |Rev ------------------+---------------- Left Center Right Beat knob |Metro Play ------------------+------------------------ Press the [Demo] button, then you can go to Pedal/MIDI Check. 6. Pedal/MIDI Check Connect the MIDI Out to the MIDI In.

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