Saturn

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IC Info

Main PCB

IC BD SATURN MAIN VA0 USA

  • IC1: CPU: HD6417095F28 or HD6417095SF28
  • IC2: CPU: HD6417095F28 or HD6417095SF28
  • IC3: RAM: HM5241605TT-17, UPD4504161G5-Al2
  • IC4: RAM: HM5241605TT-17, UPD4504161G5-Al2
  • IC5: SCU (System Control Unit): 315-5688
  • IC6: DRAM Controller: 315-5778
  • IC7: ROM: EPR-17933, MPR-17933
  • IC8: RAM: CXK58267AM-10L, UPD43257B-10LL, M5M5255BFP-12LL, SRM20257LLM10, UM62257M-70LL
  • IC9: SMPC (System Manager and Peripheral Controller): 315-5744
  • ICl0: VDP1: 315-5689, 315-5883
  • ICll: RAM: HM5241605TT-1, UPD4504161G5-A12, HM5241605TT-15
  • IC12: RAM: UPD4502161G5-A12, HM5221605TT-17, LC382161T-17
  • IC13: RAM: UPD4502161G5-A12, HM5221605TT-17, LC382161T-17
  • IC14: VDP2: 315-5690, 315-5690-02, 315-5890
  • IC15: RAM: UPD4502161G5-A12, HM5221605TT-17, LC382161T-17
  • IC16: RAM: UPD4502161G5-A12, HM5221605TT-17, LC382161T-17
  • IC17: SCSP (Saturn Custom Sound Processor): 315-5687
  • IC18: CPU: MC68EC000FN12
  • IC19: RAM: HM514270AJ-8, UPD424270LE-70, HM514270AJ-7, MN414270SJ-08
  • IC20: PLL: 315-5746
  • IC21: RGB Encoder: CXA1645M
  • IC22: Audio DAC: TDA1386T
  • IC23: 74VHC04
  • IC24: 74VHC04
  • IC25: S-80741AL-A5
  • IC26: 74LS245
  • IC27: 74LS245
  • IC28: 74ACT245
  • IC29: 74LS245
  • IC30: 74LS245
  • IC31: RAM: HM514260AJ-7, UPD424260LE-70-E2, TC514260BJ-70, KM416C256BJ-7, MB814260-70PJ-G, HY514260BJC-70
  • IC32: RAM: HM514260AJ-7, UPD424260LE-70-E2, TC514260BJ-70, KM416C256BJ-7, MB814260-70PJ-G, HY514260BJC-70
  • IC33: 74HC157
  • IC34: Regulator: UPC78L05T, TA78L05F


CDROM PCBs

CDROM: ENR-007D

CDROM: EXL-P604

Capacitor Lists

IC BD SATURN MAIN VA0 PAL: 837-11493

Purchase these parts as a kit

CE3	100uF	6.3v
CE6	100uF	6.3v
CE15	10uF	16v
CE16	10uF	16v
CE18	100uF	6.3v
CE19	100uF	6.3v
CE20	10uF	16v
CE21	10uF	16v
CE22	4.7uF	25v
CE23	10uF	16v
CE24	220uF	4v
CE25	220uF	4v
CE26	220uF	4v
CE27	220uF	4v
CE28	220uF	4v
CE29	220uF	4v
CE30	220uF	10v (6.3v OK)
CE31	10uF	16v
CE33	22uF	6.3v
CE34	22uF	6.3v
CE35	47uF	6.3v
CE37	10uF	16v
CE42	10uF	16v
CE45	330uF	6.3v
CE46	330uF	6.3v
CE47	1uF	50v
CE48	1uF	50v
CE49	47uF	6.3v
CE50	47uF	6.3v
CE52	10uF	16v
CE53	47uF	6.3v
CE55	100uF	10v


IC BD SATURN MAIN VA0.5: 837-11076-02

Purchase these parts as a kit

CE3	100uF	6.3v
CE6	100uF	6.3v	
CE15	10uF	16v
CE16	10uF	16v
CE18	100uF	6.3v
CE19	100uF	6.3v
CE20	10uF	16v
CE21	10uF	16v
CE22	4.7uF	25v
CE23	10uF	16v
CE24	220uF	4v
CE25	220uF	4v
CE26	220uF	4v
CE27	220uF	4v
CE28	220uF	4v
CE29	220uF	4v
CE30	220uF	10v (6.3v OK)
CE31	10uF	16v	
CE33	22uF	6.3v
CE34	22uF	6.3v
CE35	47uF	6.3v
CE37	10uF	16v
CE42	10uF	16v
CE45	330uF	6.3v
CE46	330uF	6.3v
CE47	1uF	50v
CE48	1uF	50v
CE49	47uF	6.3v
CE50	47uF	6.3v
CE52	10uF	16v
CE53	47uF	6.3v
CE55	47uF	6.3v


837-11891-01 USA (VA1?)

Purchase these parts as a kit

CE3	100uF	6.3v
CE6	100uF	6.3v
CE15	10uF	16v
CE16	10uF	16v
CE18	100uF	6.3v
CE19	100uF	6.3v
CE20	10uF	16v
CE21	10uF	16v
CE22	4.7uF	25v
CE23	10uF	16v
CE24	220uF	4v
CE25	220uF	4v
CE26	220uF	4v
CE27	220uF	4v
CE28	220uF	4v
CE29	220uF	4v
CE30	100uF	6.3v
CE31	10uF	16v
CE33	22uF	6v
CE34	22uF	6v
CE35	47uF	6.3v
CE37	10uF	16v
CE42	10uF	16v
CE45	330uF	6.3v
CE46	220uF	6.3v
CE47	1uF	50v
CE48	1uF	50v
CE49	47uF	6.3v
CE50	47uF	6.3v
CE52	10uF	16v
CE53	47uF	6.3v
CE55	47uF	6.3v
CE56	47uF	16v
CE57	47uF	16v


IC BD SATURN MAIN VA SG: 837-12126

Purchase these parts as a kit

CE3	100uF	6.3v
CE15	10uF	16v
CE16	10uF	16v
CE18	100uF	6.3v
CE19	100uF	6.3v
CE20	10uF	16v
CE21	10uF	16v
CE22	4.7uF	25v
CE23	10uF	16v
CE24	220uF	4v
CE25	220uF	4v
CE26	220uF	4v
CE27	220uF	4v
CE28	220uF	4v
CE29	220uF	4v
CE30	100uF	6.3v
CE31	10uF	16v
CE32	10uF	16v
CE33	22uF	6v
CE34	22uF	6v
CE35	47uF	6.3v
CE36	10uF	16v
CE37	10uF	16v
CE42	10uF	16v
CE45	330uF	6.3v
CE46	220uF	6.3v
CE47	1uF	50v
CE48	1uF	50v
CE49	47uF	6.3v
CE50	47uF	6.3v
CE52	10uF	16v
CE53	47uF	6.3v
CE55	47uF	6.3v
CE56	47uF	16v
CE57	47uF	16v


IC BD SATURN MAIN VA SD: 837-12133

Purchase these parts as a kit

CE1	100uF	6.3v
CE3	100uF	6.3v
CE7	100uF	6.3v
CE15	10uF	16v
CE16	10uF	16v
CE18	100uF	6.3v
CE19	100uF	6.3v
CE20	10uF	16v
CE21	10uF	16v
CE22	4.7uF	25v
CE23	10uF	16v
CE24	220uF	4v
CE25	220uF	4v
CE26	220uF	4v
CE27	220uF	4v
CE28	220uF	4v
CE29	220uF	4v
CE30	100uF	6.3v
CE31	10uF	16v
CE33	22uF	6.3v
CE34	22uF	6.3v
CE35	47uF	6.3v
CE37	10uF	6.3v
CE42	10uF	16v
CE45	330uF	6.3v
CE46	220uF	6.3V
CE47	1uF	50v
CE48	1uF	50v
CE49	47uF	6.3v
CE50	47uF	6.3v
CE52	10uF	16v
CE53	47uF	6.3v
CE55	47uF	6.3v

Schematics

VA0 PAL

CD Adjustments

CD p/n 610-5679-20, -21

Adjustment Preparation
Apply markings to the positions of the variable resistors before adjustment. If the adjustment are out of the specifications, the following symptoms may occur.
[Focus gain]
If the focus adjustment is too low the pickup lens will not be able to focus properly and the disk will not rotate. If the adjustment is too high portions of a track may be skipped and noise will increase.
[Tracking gain]
If the tracking adjustment is too low the drive is more susceptible to shocks or bumps, portions of a track may be skipped or the disk time counter may stop. If the adjustment is too high the pickup lens may oscillate leading to unstable or distorted sound. The focus and tracking adjustments are done so as to mutually satisfy conflicting characteristics.
6-3. Test equipment and tools necessary for adjustment
  1. Oscilloscope
  2. DC voltmeter
  3. Non-metallic adjustment screwdriver
  4. Test CD (A-BEC TCD-792A)
6-4. CD Drive Unit Adjustment Procedure
6-4-1. FE (Focus Error) bias adjustment and focus gain adjustment
  1. Connect the oscilloscope to test point FE IN as shown in Fig. 6-2.
  2. Turn the power switch on and set the CD drive to the stop mode.
  3. Adjust RI 14 (FE bias) so the DC voltage at the test point (FE IN) is 0V.
  4. Play the first track of the test CD and adjust R111 (Focus gain) so the DC voltage is -7mV.
6-4-2. FE balance and tracking gain adjustments
  1. Connect the oscilloscope to test point BP IN as shown in Fig. 6-3.
  2. Turn the power switch on and play the first track of the test CD.
  3. After play has begun, connect the TEST pin to GND.
  4. Adjust Rl04 (FE balance) so the center voltage of the waveform is 0V.
  5. Adjust R113 (tracking gain) so the amplitude of the waveform is 0.4V as in Fig. 6-4.

Service Manual