The PAC-S10 is an expansion module for the Pioneer Laseractive CLD-A100 Laserdisc player. It enables playback of Genesis cartridges, Sega CD, and laserdisc-based MegaLD games. A Laseractive player with a PAC-S10 module is the equivalent of a Sega CD, plus MegaLD functionality.
Items in () are designations from the Pioneer block diagram.
- IC1: CPU 1 (Genesis): HD68HC000FS8
- IC2: SRAM: 65256BLFP-10T
- IC3: SRAM: 65256BLFP-10T
- IC4: CPU 2 (Genesis / SMS): Z84C0006FEC (FM AUDIO D.P.)
- IC6: 315-5660 (MEGA DRIVE D.P.)
- IC7: M51C262-10 (V.RAM)
- IC8: M51C262-10 (V.RAM)
- IC13: CPU 3 (Sega CD): TMP68HC000F-12
- IC16: 74HC00A
- IC17: SRAM (CD-ROM Decoder): MB8464R-70L or MB8464A-80L
- IC18: SRAM (CD-ROM Decoder): MB8464R-70L or MB8464A-80L
- IC20: HC245
- IC22: Save RAM: MS6264CLL-10FC (Back up RAM)
- IC23: ROM: 27C210A (BIOS)
- IC24: DRAM (CD/LD Program RAM): MS514256A-80ZC
- IC25: DRAM (CD/LD Program RAM): MS514256A-80ZC
- IC26: DRAM (CD/LD Program RAM): MS514256A-80ZC
- IC27: DRAM (CD/LD Program RAM): MS514256A-80ZC
- IC28: 315-5632 (MEGA DRIVE D.P. in block diagram)
- IC29: DRAM (Sega CD): HM511664ZP8 (WORD RAM)
- IC30: DRAM (Sega CD): HM511664ZP8 (WORD RAM)
- IC31: Battery Backup IC: MB3790
- IC32: CD-ROM Decoder: LC8951
- IC36: LD-ROM Data Processor: PD6103A (LD-ROM D.P. LDV.- GRAP.V. SYNC.GENE)
- IC9, IC10: OpAmp: LM324N
- IC90: OpAmp: LM324N
- IC14: SRAM: TC51832AFL-10
- IC15: Sound Generator: 315-5476A
- IC21: SRAM: TC51832AFL-10
- IC33: DAC: LC7881M
- IC34: OpAmp: C844G
- IC35: OpAmp: C4574G
- IC37: OpAmp: 4558
- IC38: OpAmp: 4558
- IC39: HC244
- IC40: 4053BP
- IC43: T529B
- IC45: OpAmp: LM324N
Save RAM Battery
The PAC-S10 uses a LIR2016. There is enough room on the underside between the PCB and case to retrofit a battery holder for a LIR2032.
One way to tell if your battery has gone bad is to open the cartridge port and smell the inside. If you detect a faint fish-like odor, it's very likely to be that the battery has gone bad and leaked.
C11 10uf 16v C28 10uf 16v C46 10uf 16v C111 10uf 16v C112 10uf 16v C113 10uf 16v C115 47uf 16v C129 10uf 16v C141 10uf 16v C150 47uf 16v - Some PCBs have this cap outline backwards. The negative should face the SMAIN silkscreen. C167 470uF 10v C200 10uf 16v C201 10uf 16v C302 10uf 16v C303 10uf 16v C304 10uf 16v C305 47uf 16v C306 10uf 16v C307 10uf 16v C309 10uf 16v C310 10uf 16v C311 10uf 16v C312 10uf 16v C314 10uf 16v C315 10uf 16v C316 10uf 16v C317 10uf 16v C328 10uf 16v C330 10uf 16v C331 10uf 16v C337 NONE C338 10uf 16v C431 100uf 6v C434 10uf 16v C436 10uf 16v C438 10uf 16v C451 47uf 16v C453 47uf 16v C456 10uf 16v C459 10uf 16v C901 47uf 16v
SSUB & KOSUB PCB:
C15 10uf 16v C21 10uf 16v C26 100uf 6v C41 10uf 16v C101 10uf 16v C102 10uf 16v C103 10uf 16v C104 10uf 16v C105 10uf 16v C106 10uf 16v C109 1uf 50v C110 100uf 6v Moved to KOSUB board, where present C117 10uf 16v C118 10uf 16v C119 10uf BP 16v C120 10uf BP 16v C121 47uf 16v C122 47uf 16v C124 10uf 16v C125 10uf 16v C128 10uf 16v C135 10uf 16v C137 10uf 16v C138 10uf 16v C403 10uf 16v C404 10uf 16v C407 10uf 16v C409 10uf 16v C413 10uf 16v C414 10uf 16v C415 10uf 16v C416 10uf 16v C417 10uf 16v C418 10uf 16v C420 10uf 16v C422 10uf 16v C501 10uf 16v C503 10uf 16v C505 10uf 16v C508 10uf 16v C140 10uf 16v KOSUB C101 100uf 6.3v This capacitor is installed at C110 when KOSUB is not present
Bad Capacitors and Recapping Notes
Every one of the dozen or so PAC-S10 modules that I've opened has had leaking capacitors. I consider any original PAC-S10 module to be living on borrowed time, and should have its capacitors preemptively replaced.
After recapping a PAC-S10, double-check the resistance between +5 and GND to test for short. You should see a value probably around ~2K ohms, and it will slowly increase as the meter voltage charges the caps. If you see a fixed resistance less than 10 ohms, you have a dead short and will blow one of the IC protectors in the CLD-A100 power supply. A large amount of the caps in the PAC-S10 are used for decoupling, and it's quite easy to short +5 to GND during cap replacement due to the small surface-mount footprint and (typically) damaged solder resist layer.
In extreme cases, once the old caps are removed and PCBs cleaned, you may note that some traces appear compromised. Note the poor appearance of small traces between the pads of C121, as well as the pads of C403. The cap leakage has made it past the solder mask and began to corrode the copper. Luckily, most of the PAC-S10 caps are "bypass" caps between +5 and Ground. Damage to bypass cap traces is less likely. Also note the missing pad a C138.