Nakamichi DVD-15, Service Manual

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Pin No. Port Name I/O FUNCTION
1 NC --- No connection.
2,19,23,38,48
AVSS --- Ground pin.
3 LPCVREF O LPC (laser power control) reference voltage output.
4 LPCI1 I LPC (laser power control) non-inverting input pin.
5 LPCI2 I LPC (laser power control) inverting input pin.
6 LPCO O LPC (laser power control) output..
7 LDON I LPC (laser power control) on/off control (H;LD on, L: LD off).
8 FBAL I Focus balance control input.
9 VFEI_P I Focus AMP positive input pin.
10 VFEI_N I Focus AMP negative input pin.
11 FEO O Focus error output pin.
12 FE3XINN I Focus AMP negative input pin.
13 FE3XINP I Focus AMP positive input pin.
14 VFE2N4 O Vin2, Vin4 summing output.
15 VFE1N3 O Vin1, Vin3 summing output.
16 VGAOUT O Focus balance AMP output.
17 ASI I Servo full addition AMP inverting input.
18 ASO O Servo full addition AMP output.
20 TPSP I OP-AMP non-inverting input.
21 TPSO O OP-AMP output.
22 TPSN l OP-AMP inverting input.
24,25,43,79 AVDD --- +5V power supply pin.
26 REFCAPFIX --- Fixed delay capacitor connecting pin.
27 REFCAPDLY --- Variable delay capacitor connecting pin.
28 CLIMITER --- Phase error limit capacitor connecting pin.
29 VDOWN O Low reference voltage output (nominal: 1.25V)
30 HOLD I Select TE detection method. (L: TE detection method, H: improved method)
31 LIMIT --- Phase error limit capacitor connecting terminal.
32 POF NEG l POF AMP negative input pin.
33 POF O TE (tracking error) phase off-track voltage output.
34 VREF O Reference voltage output (nominal: 2.5V).
35 TBAL I Tracking balance control pin (nominal input range: 2.5V
±
1.25V).
36 VUP O High reference voltage output (nominal: 3.75V)
37 TE O TE (tracking error) AMP output.
39 TE_N I TE (tracking error) AMP inverting input.
40 CMN I Comparator inverting input.
41 CMOUT O Comparator output.
42 CMP l Comparator non inverting input.
44 POFP I POF non inverting input.
45 OFTR_2 O CD off-track analog output.
46 POFN l POF inverting input.
47 POF_2.2 O 2.2V reference voltage output.
49 XDVD l DVD control pin.
50 XCD2 I CD 2X control pin.
51 XCD4 l CD 4X control pin.
52 OFTR O Off track detect output pin.
53 COFTR --- OFTR AMP filtering capacitor connecting pin.
54 COFTR_FAST O OFTR AMP timing capacitor connecting pin.
55 BUF_COFTR O Buffered output of OFTR AMP.
56 OFTRVTH --- OFTR AMP threshold voltage setting pin.
7.5 CYC11AP000 (DVD Pre-AMP) - IC100 on DVD Main P.C.B. Ass’y
(to be continued)
IC BLOCK DIAGRAMS