Separately sourced scan, sheets 1–2

Schematic Diagram

XII. Schematic Diagram

Schematic sheet 1: the four-track cross-field head assembly (No. 7) with its record/playback, bias, and erase head switching, feeding the CD-512 record/playback amplifier board (Tr1–Tr4) and the CD-511 board, wired to the microphone and line input jacks, line outputs, stereo phones jack, VU meters, and DIN connectors ⤢ zoomSchematic sheet 1: the four-track cross-field head assembly (No. 7) with its record/playback, bias, and erase head switching, feeding the CD-512 record/playback amplifier board (Tr1–Tr4) and the CD-511 board, wired to the microphone and line input jacks, line outputs, stereo phones jack, VU meters, and DIN connectors

Schematic sheet 2: the bias oscillator section (XR-OSC and 150-OSC transformers, Tr6–Tr7), the power supply with its 100–240 V voltage-selector taps, rectifier diodes, pilot lamp, and motor circuit, plus the factory transistor-type list in the margin and a note that the right-channel P.C. board is the same as the left ⤢ zoomSchematic sheet 2: the bias oscillator section (XR-OSC and 150-OSC transformers, Tr6–Tr7), the power supply with its 100–240 V voltage-selector taps, rectifier diodes, pilot lamp, and motor circuit, plus the factory transistor-type list in the margin and a note that the right-channel P.C. board is the same as the left

Component BOM

Site note

This bill of materials is site-derived, not a page of the manual: every row was read off the two schematic sheets above at full zoom, then cross-referenced against two more factory sources — the chapter IX replacement-parts table, which carries Akai's own nomenclature and stock numbers, and the chapter X printed-circuit board layouts for the CD-512 and CD-511 cards (manual pages 20–21), whose silkscreens print designators and values directly on the boards. Values are transcribed exactly as the schematic prints them: resistors in ohms ("150K" = 150 kΩ), electrolytics as µF/working-volts ("10/10" = 10 µF, 10 V), other capacitors in µF when printed as a decimal (".01") and in pF when suffixed P ("330P"). Where the sources disagree, all readings are given in the Notes column; with three sources, a 2-to-1 split names its likely outlier. The sheets label one channel only; sheet 2's note says the right-channel P.C. board is the same as the left. Designators below 100 are chassis-mounted parts, the 100-series sit on the CD-511 equalizer/head-switching card, the 200-series on the CD-512 record/playback amplifier card, and the 400-series on the oscillator card.

Semiconductors

Ref	Schematic	Chapter IX listing	Notes
Tr1, Tr2	2SC650 Ⓐ	Transistor 2SC650 (A) — C9-003a
Tr3, Tr4	2SC281 Ⓑ	Transistor 2SC281 (B) — C9-003b
Tr5	2SC458 Ⓑ	Transistor 2SC458 (B) — C8-006
Tr6, Tr7	2SC696 [suffix illegible]	Transistor 2SC696 — C10-004	The margin list prints circled grade letters after 2SC696 that don't resolve at scan resolution.
D101	(type not printed)	Diode 1N34A — C8-005
D-1, D-2	(type not printed)	Silicon Diode SW-05-01 — C7-017 / C10-007	Rectifier pair off T1's secondary.

CD-512 record/playback amplifier card

Ref	Schematic	Chapter IX listing	Notes
R201	100K	Resistor 1/4P 100KΩ J — C9-004f
R202	100K	Resistor 1/4P 100KΩ J — C9-004f
R203	150K	Resistor 1/4P 150KΩ K — C9-004h
R204	3.3K	Resistor 1/4P 3.3KΩ K — C9-004b
R205	220	Resistor 1/4P 220Ω K — C9-004a
R206	22K	Resistor 1/4P 22KΩ K — C9-004d
R207	4.7K	Resistor 1/4P 4.7KΩ K — C9-004c
R208	100K	Resistor 1/4P 100KΩ J — C9-004f
R209	120K	Resistor 1/4P 120KΩ J — C9-004g
R210	10K	Resistor 1/4P 10KΩ K — C9-004m
R211	4.7K	Resistor 1/4P 4.7KΩ K — C9-004c
R212	15K	Resistor 1/4P 15KΩ K — C9-004n
R213	470	Resistor 1/4P 470Ω K — C9-004k
R214	100	Resistor 1/4P 100Ω K — C9-004i	Chapter IX prints this designator as "(R) 214)".
R215	1.5K	Resistor 1/4P 1.5KΩ K — C9-004l
R216	330	Resistor 1/4P 330Ω K — C9-004j
R217	68K	Resistor 1/4P 68KΩ J — C9-004e
VR201	20KB	Variable Resistor 20KB — C9-006	Playback-level preset.
C201	10/10	Condenser 10μ 10V — C9-005b
C202	10/10	Condenser 10μ 10V — C9-005b
C203	50/25	Condenser 50μ 25V — C9-005d
C204	10/10	Condenser 10μ 10V — C9-005b
C205	.01	Condenser 0.01μ 50V — C9-005g
C206	10/10	Condenser 10μ 10V — C9-005b
C207	1/10	Condenser 1μ 10V — C9-005i
C208	100/3	Condenser 100μ 3V — C9-005a
C209	100/3	Condenser 100μ 3V — C9-005a
C210	.022	Condenser 0.22μ 50V — C9-005h	Sources disagree: the schematic prints .022 and the CD-512 board layout (manual p. 20) also reads .022; chapter IX's 0.22μ is the odd one out, off by a decade.
C211	330P	Condenser 330P 35WV — C9-005e
C212	10/25	Condenser 10μ 25V — C9-005c
C213	220P	Condenser 220P 35V — C9-005f
T201	(value not printed)	Headphone Transformer 7K 8Ω — C9-007

CD-511 equalizer / head-switching card

Ref	Schematic	Chapter IX listing	Notes
R101	68K	Resistor 1/4P 68KΩ K — C8-008b
R102	22K	Resistor 1/4P 22KΩ K — C8-008c
R103	22K	Resistor 1/4P 22KΩ K — C8-008c
R104	5.6K	Resistor 1/4P 5.6KΩ K — C8-008g
R105	22K	Resistor 1/4P 22KΩ K — C8-008c
R106	10K	Resistor 1/4P 10KΩ K — C8-008f
R107	15K	Resistor 1/4P 15KΩ K — C8-008d
R108	1K	Resistor 1/4P 1KΩ K — C8-008i
R109	120K	Resistor 1/4P 120KΩ K — C8-008a
R110	10K	Resistor 1/4P 10KΩ K — C8-008f
R111	12K	Resistor 1/4P 12KΩ K — C8-008e
R112	27K	Resistor 1/4P 2.7KΩ K — C8-008h	Sources disagree: the schematic clearly prints 27K, but chapter IX and the CD-511 board layout (manual p. 21) both print 2.7K — the schematic is the odd one out, off by a decade.
VR151	2KB	Variable Resistor V-10K5 2KΩ B — C8-009	Chapter IX lists the 2KΩ (B) preset without a designator; the schematic and the CD-511 board layout both print one, and both prints are cramped at scan resolution — VR151, possibly VR161. The 2KB value matches in all three sources.
C101	.15	Condenser 0.15μ 35V K — C8-010j
C102	330P	Condenser 330PF 35V K — C8-010d
C103	.012	Condenser 0.012μ 50V J — C8-010f
C104	120P	Condenser 120PF (J) — C8-010k
C105	.01	Condenser 0.01μ 50V K — C8-010e
C106	.015	Condenser 0.015μ 50V K — C8-010g
C107	.056	Condenser 0.056μ 50V K — C8-010i
C108	3/25	Condenser 3μ 25V — C8-010a
C109	.022	Condenser 0.022μ 50V K — C8-010h
C110	10/10	Condenser 10μ 10V — C8-010b
C111	30/3	Condenser 30μ 3V — C8-010c
C112	220P	—	No chapter IX row, but the CD-511 board layout prints C112 220P — board and schematic agree.
L101	47mH	—	No chapter IX row; the board layout prints the same value.
L102	3mH	—	No chapter IX row; the board layout prints the same value.
SW101	(record/play slide switch)	—	Chapter IX lists card slide switches without a designator; the board layout prints SW101 beside its REC⇄PLAY legend.

Chassis: amplifier and power supply

Ref	Schematic	Chapter IX listing	Notes
R1	680	Resistor 1/4P 680KΩ — C7-013a	Sources disagree: the schematic prints 680 with no K (unlike its neighbor R2 220K); chapter IX lists 680KΩ.
R2	220K	Resistor 1/4P 220KΩ — C7-013b
R3	68K	Resistor 1/4P 68KΩ — C7-013c
R4	910	Resistor 1W L 910Ω — C7-013e
R5	82	Wired Resistor 2W 82Ω — C7-013d
R6	47	—	Schematic only; in the head-shield/DIN circuit at J8.
R7	170	Wired Resistor 5W 170Ω — C4-002a	Chapter IX lists it in the Switch Block without a designator; the schematic supplies R7.
R8	4.7K	Resistor 1/4P 4.7KΩ — C7-013f
R9	15K	Resistor 1/4P 15KΩ — C7-013g
VR1	50KA	Variable Resistor 50KΩ (A) — C7-007	Record-level control.
C1	500/50	Tubular Type Electrolytic Condenser 500μF 50WV — C7-014a
C2	1000/25	Tubular Type Electrolytic Condenser 1000μF 25WV — C7-014b
C5	1µ	—	Motor circuit; schematic only.
C6a	20µ	—	Motor circuit; schematic only.
C6b	0.8µ	—	Motor circuit; schematic only.
HT-1.5	(choke, one per channel)	—	In series with each playback head line; schematic only.
T1	(100–240 V primary taps)	Power Transformer (T-1) — C7-002	Primary tapped 100 / 110 / 120 / 200 / 220 / 233 / 240 V.
PL1	(pilot lamp)	Pilot Lamp — C7-010b

Oscillator card

Ref	Schematic	Chapter IX listing	Notes
R402	10	Resistor 1/2W 10Ω K — C10-006c	Chapter IX lists the card's three resistors without designators; the schematic supplies them.
R403	1K	Resistor 1/4W 1KΩ K — C10-006a
R404	100	Resistor 1/4W 100Ω K — C10-006b
C401	10µ/50	Condenser 10μ 50V — C10-005c
C402	100/3	Condenser 100μ 3V — C10-005b
C403	.047	Condenser 0.047μ 50V — C10-005e
C404	.01	Condenser 0.01μ 50V — C10-005d
C405	9000P	Condenser 9000PF 500V — C10-005a
C406	220P	Condenser 220P — C10-005f
C407	220P	Condenser 220P — C10-005f
XR-OSC	(oscillator transformer)	Oscillator Coil — C10-003	Drawn inside the card boundary labeled 150-OSC.

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