Saturn:Super Prologue 21 Model SKC-3000

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. Other variants are different interally but overall are the same; a Kareoke machine using Saturn as a processor.

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.

RAM card connected to SCSI card

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

Denon GU-2825-1 Has all the components for Saturn to interact with SCSI HDD with SCSI port connected. It also connects to the Denon RAM card.

SCSI card that connects to Saturn and HDD

Denon SCSI LSI Card

Capacitor	Microfarad	Voltage
C69	100uf	6.3v
C3	100UF	6.3V
C1	100UF	6.3V
C42	100UF	6.3V
C30	100uf	6.3v
C18	100UF	6.3V
C14	10UF	25V
C26	10UF	25V
C38	10UF	25V
C37	10uf	25v
C25	10UF	25V
C24	10UF	25V
C13	10UF	25V
C12	10UF	25V
C36	10UF	25V
C119	10UF	16V
C118	10UF	16V
C125	10UF	16V

Denon GU-2826-1

Denon Card with 4 (!) Composite video out, S-video out, two composite inputs? and a console port.

Composite card

Composite/S-video Card

Capacitor	Microfarad	Voltage
C903	220uf	16v
C902	220UF	16V
C904	10UF	16V
C926	100UF	16V
C928	470uf	6.3v
C923	100UF	16V
C925	470UF	6.3V
C920	100UF	16V
C922	470UF	6.3V
C917	100uf	16v
C919	470F	6.3V
C905	10UF	16V
C906	10UF	16V
C908	100UF	16V
C914	1UF	50V
C913	1UF	50V

Denon NCMK-C2X

Denon card resposible for some mixing of audio and video?

Denon card with mixing capabilities.

Soldered wiring harness. You will need to remove and add the harness back once you're done recapping

Denon Mixing board

Capacitor	Microfarad	Voltage
C182	220uf	25v
C184	220UF	25V
C10	10UF	16V
C5	10UF	16V
C12	100uf	16v
C377 (Behind green port)	1UF	50V
C3	1UF	50V
C13	100UF	16V
C8	1UF	50V
C16	1uf	50v
C180	10UF	16V
C168	10UF	16V
C167	10UF	16V
C179	10UF	16V
C161	1UF	50V
C164	1UF	50V
C158	100uf	16v
C157	100UF	16V
C162	22UF	50V
C155	1UF	50V
C150	10UF	16V
C138	10UF	16v
C149	10UF	16V
C136	10UF	16V
C130	10UF	16V
C153	1UF	50V
C126	10UF	16V
C113	1uf	50v
C125	10UF	16V
C135	10UF	16V
C121	1UF	50V
C122	22UF	50V
C116	100UF	16V
C115	1UF	50V
C118	100uf	16v

Denon GU-2825-3

Seems to be the external SCSI for for the Prologue unit that connects to Commander CD-changer unit.

Notice the two fuses that could potentially blow. They're 1.6A each

EXT SCSI Interace

Capacitor	Microfarad	Voltage
C164	10uf	6.3v
C162	10UF	16V
C17	100UF	6.3V

Yamaha XR650

Yamaha DC Module card

EXT SCSI Interace

Capacitor	Microfarad	Voltage
C3	470uf	16v
C4	470UF	16V
C2	100UF	16V
C1	100UF	16V

Denon GU-2821-2

One of two Denon cards on the front metal plate, right behind Prologue front panel

Denon Front Plate card

Capacitor	Microfarad	Voltage
C375	220uf	25v
C71	10UF	16V
C72	10UF	16V
C374	220UF	25V
C85	10uf	16v
C86	10UF	16V
C108	100UF	16V
C110	100UF	16V
C98	100UF	16V
C95	100uf	16v
C189	10UF	16V
C190	10UF	16V
C353	220UF	25V
C351	220UF	25V
C329	10UF	16V
C33? (part is cut off)	10UF	16V
C335	10uf	16v
C336	10UF	16V
C363	100UF	16V
C284	100UF	16V
C282	100UF	16V
C364	100UF	16v

Denon GU-2831-3

Card attached to front faceplate responsible for volume adjustments.

Denon Volume card

Capacitor	Microfarad	Voltage
C224	100uf	16v
C223	100UF	16V
C224	10UF	16V
C236	100UF	16V
C235	100uf	16v
C225	22UF	50v
C221	10UF	16V
C213	10UF	16V
C388	10UF	16V
C215	10uf	16v
C204	10UF	16V
C387	10UF	16V
C241	10UF	16V
C242	10UF	16V
C243	10UF	16V
C247	0.1UF	50V
C254	22uf	50v
C249	100UF	16V
C248	100UF	16V
C261	0.1UF	50V
C259	10UF	16V
C255	100UF	25v
C267	100uf	16v
C260	10UF	16V
C268	100UF	16V
C324	100UF	16V
C308	100uf	16v
C384	10UF	16v
C323	100UF	16V
C307	100UF	16V
C305	100UF	16V
C306	100uf	16v
C315	100UF	16V
C314	100UF	16V
C382	10UF	16V
C383	10UF	16V
C292	100UF	16V
C290	100UF	16V
C300	100uf	16v
C381	10UF	16V
C289	100UF	16V
C291	100UF	16V
C300	100UF	16V