Saturn:Super Prologue 21 Model SKC-3000

Super Prologue 21 Recommended Maintenance

Super Prologue 21 is a Saturn built into a Kareoke machine with a VA0 Saturn motherboard. This page covers the SKC-3000 variant. Not other variants.

Common failures include no power, black screen on powerup and not reading discs. Overhauling a Prologue 21 should not be taken lightly and only approached by absolute experts with a very large amount of experience.

There is a messy wiring harness system inside the Prologue unit with total disassembly required to access the CD-ROM drive which is a common failure point. It is recommended to take photos on your phone overdocumenting your disassembly process in order to reduce pain in reassembly. It is also recommended to unplug, from wiring harnesses, ONE card at a time for recapping and then connecting the wiring system back to the card. Rinse and repeat.

Main motherboard is a normal VA0 Saturn motherboard with modification to the cartridge slot; the cartridge slot is modified to accomodate the kareoke scsi card subsystem. FRAM modification can be applied. However a region free bios replacement is not recommended as the Saturn uses a unique EEPROM module compared to standard VA0-VA0.5 Saturn motherboards. Unless the Specific Kareoke BIOS EEPROM is region patched do NOT place a regular region free EEPROM in the socket.

Roland 01-HR-SE Harmony Board

Should have a Sega logo somewhere along with "SKZ-0001 835-12275".

For this card you can use through hole capacitors fine provided they're pushed downward and position strategically.

Roland Harmony Board 01-HR-SE

Capacitor	Microfarad	Voltage
C13	100uf	6v SMD
C14	100UF	6V SMD
C7	100UF	6V SMD
C100	10UF	16V SMD
C64	10UF	16V SMD
C51	10UF	25V
C98	10UF	25V
C48	10UF	16V SMD
C97	1UF	50V SMD
C96	1UF	50V SMD
C26	10UF	16V SMD
C62	10UF	25V
C66	10UF	25V
C63	10UF	25V
C71	100UF	6V SMD
C74	10UF	16V SMD
C35	10UF	16V SMD
C36	10UF	16V SMD
C54	10UF	25V
C55	10UF	25V
C32	10UF	25V
C94	10UF	25V
C52	10UF	16V SMD
C39	10UF	16V SMD
C85	10UF	16V SMD
C88	10UF	16V
C3	1UF	50V SMD

Denon GU-2824-3 I/O Unit

Denon I/O Unit

Capacitor	Microfarad	Voltage
C465	100uf	10v
C506	100UF	6.3V
C451	330UF	6.3V
C502	100UF	16V
C457	2.2UF	50V

Sega DSP Board ASSY 70459323 00

Made by BOSS. Note the light capacitor damage from SMD Capacitors.

BOSS card. Note leaking SMD capacitors.

BOSS DSP Board

Capacitor	Microfarad	Voltage
C14	1uf	50v
C7	1UF	50V
C16	10UF	16V
C27	10UF	16V
C24	10uf	16v
C18	10UF	16V
C38?(right below C16)	1UF	50V
C30 (below C38)	1UF	50V
C28	47UF	6V
C29	47uf	6v
C? (right below C28)	1UF	50V
C52? (near IC10 silkscreen)	1UF	50V
C59	10UF	16V
C71	10UF	16V
C68	10UF	16V
C62	10UF	16V
C82 (below C59)	1uf	50v
C74 (above C72)	1UF	50V
C72	47UF	6V
C73	47UF	6V
C105	100UF	16V
C90	330UF	6V? (try to go to 10V)?
C101	100UF	16V
C100	100UF	16V

Roland 01-SE Sound Module Board

Primary Roland Sound MIDI module.

MIDI card

MIDI Card

Capacitor	Microfarad	Voltage
C3	10uf	16v
C15	10UF	16V
C40	10UF	16V
C19	10UF	16V
C52	100uf	16v
C54	47UF	16V
C53	47UF	16V
C24	100UF	16V
C23	47UF	16V
C25	10uf	16v
C29	10UF	16V
C32	10UF	16V
C36	10UF	16V
C33	47UF	16V
C37	100UF	16V
C34	100UF	16V
C67	47uf	16v
C69	100UF	16V
C68	47UF	16V

SCSI Card

SCSI Card plugs into modified VA0 Saturn board. The HDD connects to this card. On this special 'sandwhich' card is full of RAM and SCSI LSI. It is two cards connected together with a connector.

If using radial capacitors keep in mind the capacitor legs must be very carefully trimmed so the card can be closed together again.

Denon GU-2825-2 (RAM)

Capacitor	Microfarad	Voltage
C155	47uf	16v
C156	47UF	16V
C153	47UF	16V
C154	47UF	16V
C150	100uf	16v
C149	100UF	16V
C147	100UF	16V
C148	100UF	16V
C152	10UF	50V
C151	10uf	50v
C124	100UF	6.3V
C117	100UF	6.3V
C183	100UF	6.3V