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Yamaha AD824 Service Manual

Other manuals for AD824: Owner's Manual

Summary of AD824

  • Page 1

    Service manual pa 011523 hamamatsu, japan 1.45k-9731 k printed in japan '00.07 contents specifications ···································································· 3 panel layout ······································································· 5 circuit board layout ··················...

  • Page 2

    Ad824 2 warning: chemical content notice! The solder used in the production of this product contains lead. In addition, other electrical/electronic and/or plastic (where applicable) components may also contain traces of chemicals found by the california health and welfare agency (and possibly other ...

  • Page 3: Specifications

    Specifications ad824 3 important notice for the united kingdom connecting the plug and cord important. The wires in this main lead are coloured in accordance with the following code: blue: neutral brown: live as the colours of the wires in the main lead of this apparatus may not correspond with the ...

  • Page 4

    Ad824 4 *1. 24-bit linear, 128-times oversampling a/d converters. *2. Xlr-type connectors are electronically balanced (pin 1 = ground, pin 2 = hot, pin 3 = cold). *3. Trs phone jacks are electronically balanced (tip = hot, ring = cold, sleeve = ground). * where db represents a specific voltage, 0 db...

  • Page 5: Panel Layout

    On off power ad converter 1 2 3 4 5 6 7 8 peak signal nominal peak signal +48v sel nominal +48v word clock internal 44.1khz bnc slot 48khz sel db gain off on +48v master input (bal) out (bal) in (bal) insert com nverter ad824 8 2 3 1 4 5 6 7 8 3 2 1 4 5 6 7 8 4 3 2 1 5 6 7 slot out pc rs422 75 in on...

  • Page 6: Circuit Board Layout

    Ad824 6 circuit board layout main mysl ha jk ad ac rear panel assembly front panel assembly power transformer pn sw cn909 cn903 cn906 cn902 cn904 cn905 cn901 cn908 cn907 cn101 cn201 cn002 cn001 cn961 cn960 cn962 cn963 cn052 cn053 cn051 cn054.

  • Page 7

    Ad824 7 jk ad cn103 ad- cn104 ad- cn204 cn203 cn202 cn102 cn005 cn004 cn002 cn001 cn003 cn004 cn001 cn003 mysl ac dc pn sw cn002 cn008 cn010 cn011 cn007 cn006 cn005 cn009.

  • Page 8: Dimentions

    Ad824 8 dimentions 67.5 67.5 345 35 35 410 430 13 88 h: 97.5 30 30 48 (33) 274 10.8 45 17 355 d: 377.6 w: 480 unit: mm.

  • Page 9: Block Diagram

    Ch1 input jk101 insert out jk102 cn002 cn101 cn102 ic101 cn003 fs sdata out1 ~ 8 , fs-ad , 64fs-ad , 256fs-ad , reset-ad 64fs 256fs reset cn002 cn962 level pad pad ha1 ha1 ha2a ,ha2b ,ha2c +48v q102 ry101 ic101 ic102 pad ha2 a / d perk nominal signal ha1 ba insert in jk103 ic103 7 7 1 ic104 ic104 ai...

  • Page 10: Disassembly Procedure

    Ha top cover if plate [460] [530] [300] [450] x16 [290] [a] [500] x14 [310] [500]: bind head tapping screw-b a4.0x8 mfzn2bl (vc688800) fig. 1 [330]: bonding tapping screw-b 3.0x8 mfzn2bl (vn413300) [390]: bonding tapping screw-b 3.0x8 mfzn2bl (vn413300) [530]: bind head screw a4.0x12 mfzn2bl (vp1569...

  • Page 11

    Ad824 11 [400] [350] [370] [370] jk ad [350]: bonding tapping screw-b 3.0x8 mfzn2bl (vn413300) [370]: bonding tapping screw-b 3.0x8 mfzn2bl (vn413300) [400]: bind head tapping screw-b 3.0x6 mfzn2bl (ep600230) [430]: bind head tapping screw-b 3.0x6 mfzn2bl (ep600230) fig. 3 fig. 4 [400] [430] [430] a...

  • Page 12

    [60] [140] [140] [140] dc [40]: bonding tapping screw-b 3.0x8 mfzn2bl (vn413300) [60]: pan head screw sp4.0x8 mfzn2y (el200020) fig. 7 [140]: oval head screw b4.0x10 mfzn2bl (v6221000) fig. 8 • dc assembly [40] [40] [40] transistor holder rack mount angle rack mount angle [140] fuses fuses ad824 12 ...

  • Page 13

    Fig. 10 battery vn103500 vn103600(battery holder for vn103500) notice for back-up battery removal push the battery as shown in figure, then the battery will pop up. Druk de batterij naar beneden zoals aangeven in de tekening, de batterij springt dan naar voren. Battery battery holder main [80] pn sw...

  • Page 14: Lsi Pin Description

    Ad824 14 lsi pin description pin no. I/o function name pin no. I/o function name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 daux hdlt dout vfl opt sync mcc wc mcb mca sksy xi xo p256 lock vss tc dim1 dim0 dom1 dom0 km1 i o o o o o o o o o i i o o o o i i i i i auxiliary input for audio...

  • Page 15

    Ad824 15 pin no. I/o function name pin no. I/o function name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 pe14 pe15 vss a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12 a13 a14 a15 a16 vcc a17 ...

  • Page 16: Ic Block Diagram

    Ad824 16 ic block diagram hd74lv04afpel (is000400) hd74lvu04afpel (xy102a00) hex inverter main: ic914,920 hd74lv08afpel (is000800) quad 2 input and main: ic912 hd74lv32afpel (is003200) quad 2 input or main: ic926 hd74lv74afpel (is007400) dual d-type flip-flop main: ic907,919 sn74lv138ansr (is013810)...

  • Page 17

    Ad824 17 hd74lv245afpel (is024500) octal 3-state bus transceiver main: ad: ha: hd74lv273afpel (is027300) octal d-type flir flop main: ha: sn75121nsr (xu816a00) dual line driver main: ic930 sn75124ns (xn976a00) triple line receiver main: ic902 sn75c1168nsr (xu073a00) line driver / receiver main: ic90...

  • Page 18

    Ad824 18 njm2082m(t1) (xn797a00) njm2068md-t1 (xj553a00) njm4556al (xp844a00) dual operational amplifier main: ad: ha: pn: jk: 1 2 3 4 -v 8 7 6 5 output a +v non-inverting input a -dc voltage supply +dc voltage supply output b inverting input b non-inverting input b inverting input a + - + - ic918 i...

  • Page 19: Circuit Boards

    Ac, sw(h,w,b): 3na-v579150 ac, sw(j,u,v): 3na-v579140 power on/off 1 1 sw circuit board (j, u, v) ac circuit board (j, u, v) sw circuit board (h, w, b) ac circuit board (h, w, b) power transformer ac cord power on/off power transformer ac cord circuit boards ad824 19 ac circuit board (j, u, v) (xy03...

  • Page 20

    To ad-cn003 main circuit board a' a 3na-v579130 to ha-cn002 to mysl-cn054 to pn-cn960 to pn-cn961 to mysl-cn053 from dc-cn010 ad824 20

  • Page 21

    In out rs422 rs422 pc word clock from main-cn902 75 off on mysl circuit board a' a main, mysl: 3na-v579130 battery vn103500 vn103600(battery holder for vn103500) notice for back-up battery removal push the battery as shown in figure, then the battery will pop up. Druk de batterij naar beneden zoals ...

  • Page 22

    Main circuit board b' b 3na-v579130 ad824 22.

  • Page 23

    E' b b' main, mysl: 3na-v579130 mysl circuit board ad824 23 pattern side pattern side.

  • Page 24

    3na-v579110 input (bal) 123 4 5 6 7 8 1 ha circuit board c' c ad824 24.

  • Page 25

    Ad824 25 3na-v579110 to main-cn903 1 c' c to jk-cn202 to jk-cn102 to dc-cn007 component side.

  • Page 26

    Ha circuit board 3na-v579110 1 d' d ad824 26.

  • Page 27

    3na-v579110 1 d' d ad824 27 pattern side.

  • Page 28

    Ad824 28 3na-v579120 ad circuit board e' e insert in (bal) to main-cn909 12 3 4 5 6 7 8 to jk-cn203 to jk-cn103.

  • Page 29

    Ad824 29 jk circuit board e' e ad, jk: 3na-v579120 insert out (bal) to dc-cn011 1 2 34 5 6 78 from ha-cn201 to ad-cn204 from ha-cn101 to ad-cn104 to pn-cn962 component side component side.

  • Page 30

    Ad824 30 ad circuit board 3na-v579120 f' f.

  • Page 31

    Ad824 31 jk circuit board f' f ad, jk: 3na-v579120 pattern side pattern side.

  • Page 32

    3na-v579100 1 pn circuit board g' g g' g from dc-cn009 to main-cn905 from ad-cn002 to main-cn904 ad824 32 component side.

  • Page 33

    Pn circuit board 3na-v579100 1 h' h h' h ad824 33 pattern side.

  • Page 34

    To mysl-cn052 dc circuit board (j, u, v) 3na-v579140 1 i' i i' i power transformer power transformer to main-cn906 to ad-cn001 to pn-cn963 to ha-cn001 ad824 34 component side.

  • Page 35

    Dc circuit board (h, w, b) 3na-v579150 1 j' j j' j to mysl-cn052 power transformer power transformer to main-cn906 to ad-cn001 to pn-cn963 to ha-cn001 ad824 35 component side.

  • Page 36: Inspection

    1. Preparations 1-1 conditions · the setting for ad824 is gain 10 db, word clock int 48 khz. · word clock in 75 ohms is set to on. · signal input of only the ch to be measured. · input signal to nch when measuring nch. · 0 dbu=0.775 vrms · the output impedance of the oscillator connected is 150 ohms...

  • Page 37

    (5) noise level ein conditions: ch in 1 to 8 channels shorted using 150 ohms. However, if it does not enter within the permissible range shown above, the measured value shall be (gain per 1 khz) ≤ -128. (6) difference between channels specify so that it will be less than the difference in the gain r...

  • Page 38

    (2) bnc · connect ad824 word clock out and da824 word clock in. · insert my8-ae card into the slot and connect to dsa1 via the d-sub-cannon converter box. · set ad824 word clock settings to bnc. · set ad824 word clock settings to 44.1 khz and 48 khz. 2-6 fs operating range · connect the oscillator t...

  • Page 39: Test Program

    Ad824 39 1. Reparations · connect pc (operating ms windows) to com pc/rs422 terminal. The switch selects the pc. · euse a bnc cable to connect the in and out terminals of the world clock. · insert the slot inspection jig (tx800810) into the slot. · einsert the turning jig into com rs422 terminal (cn...

  • Page 40

    Ad824 40 when in the test program execution, select the test program number for the gain encoder and the program can be executed each time the [+48v] key is pressed. During selection, the number will flash on the 7segled and will change to steady on when the program is completed. The following is th...

  • Page 41

    Ad824 41 slot and cpu connection check the first line on the screen shows the condition at the data bus from the left d15, d14. . . . D1, d0. The second line on the screen shows the condition at the address bus from the left a15, a14 . . . A2, a1. The third line on the screen shown the condition at ...

  • Page 42

    Ad824 42 5. [d02] switch inspection select the test program number [d02] with the gain encoder. The led inspection will be executed when the [+48v] key is pressed. Or, it can also be executed by entering 1. The led near the relevant switch flashes. 2. When the switch is pressed, the led changes to s...

  • Page 43: Flash Rom Upgrade

    Ad824 43 flash rom upgrade the ad824 is equipped with flash memory (main: ic927). The software in the flash memory can be upgraded from the com pc/rs422 terminal. Upgrades can also be performed from a windows pc using the dedicated software. When the power is turned on, a check is made to confirm th...

  • Page 44

    Ad824 44 2-4. Loading the program click the [load] switch and the program will start to load. When completed, the following message will be displayed. 2-5. Others click the [disconnect] switch to reset the ad824 to the regular mode..

  • Page 45: Error Messages

    Ad824 45 error messages the ad824 performs several diagnostic checks when it’s turned on. If a problem isdetected, one of the following error codes appears briefly on the gain display. Internal backup-battery voltage low. Internal memory data corrupt. Internal backup-battery voltage low and internal...

  • Page 46: Parts List

    Contents overall assembly······························································································································ 2 front panel assembly ····················································································································· 4 rear ...

  • Page 47: Overall Assembly

    Ad824 2 overall assembly 500 440 460 470 90 100 140 130 120 420 445 400 100 450 390 330 530 520 290 80 40 rear panel assembly: see page 5 150 270 540 310 320 300 50 380 350 340 360 200 210 205 160 170 30 60 250 240 370 430 480 490 230 25 35 70 80 33 34 32 140 130 120 190 120 180 110 10b 10c 10d 10a ...

  • Page 48

    Ad824 3 overall assembly overall assembly overall assembly overall assembly overall assembly bottom assembly bottom chassis leg black bind head tapping screw-b protection sheet label label holder ferrite core cord holder holder, cord rear panel assembly rear panel assembly rear panel assembly rear p...

  • Page 49: Front Panel Assembly

    Ad824 4 if plate bind head screw label accessories dsub cable description 520 530 540 ref no. Vz678500 vp156900 cb076120 v5436200 part no. A4.0x12 mfzn2bl 9p h,w,b remarks 2 qty rank 05 01 07 *: new parts rank : japan only front panel assembly 10 40 50 20 30 90 60 70 100 110 80 front panel assembly ...

  • Page 50: Rear Panel Assembly

    Ad824 5 rear panel assembly rear panel assembly rear panel assembly rear panel assembly rear panel assembly rear panel rear panel rear panel ac cord assembly ac cord assembly ac cord assembly ac cord assembly cord strain relief cord strain relief cord strain relief circuit board circuit board bind h...

  • Page 51: Dc Assembly

    Ad824 6 dc assembly dc assembly dc assembly heat sink insulation sheet circuit board circuit board bonding tapping screw-b holder, transistor pan head screw fuse fuse fuse fuse fuse fuse fuse fuse fuse fuse fuse fuse description 10 20 30 30 40 50 60 f002 f002 f003 f003 f004 f004 f005 f005 f006 f006 ...

  • Page 52: Electrical Parts

    Ad824 7 electrical parts circuit board circuit board circuit board circuit board circuit board circuit board circuit board circuit board circuit board circuit board circuit board circuit board circuit board circuit board circuit board circuit board circuit board circuit board cap screw-b ac shield p...

  • Page 53

    Ad824 8 ic jumper wire jumper wire land terminal land terminal line filter metal oxide film resistor carbon resistor carbon resistor carbon resistor metal oxide film resistor carbon resistor carbon resistor carbon resistor metal oxide film resistor carbon resistor carbon resistor carbon resistor met...

  • Page 54

    Ad824 9 monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Electrolytic cap. Electrolytic cap. Electrolytic cap. Electrolytic cap. Monolithic ceramic cap. Monolithic ceramic cap. Electrolytic cap. Monolithic...

  • Page 55

    Ad824 10 monolithic ceramic cap. Electrolytic cap. Monolithic ceramic cap. Monolithic ceramic cap. Mylar capacitor monolithic ceramic cap. Electrolytic cap. Monolithic ceramic cap. Monolithic ceramic cap. Electrolytic cap. Monolithic ceramic cap. Monolithic ceramic cap. Electrolytic cap. Monolithic ...

  • Page 56

    Ad824 11 monolithic ceramic cap. Electrolytic cap. Monolithic ceramic cap. Monolithic ceramic cap. Mylar capacitor monolithic ceramic cap. Monolithic ceramic cap. Cable holder wire trap cable holder wire trap cable holder cable holder wire trap cable holder cable holder wire trap cable holder lc fil...

  • Page 57

    Ad824 12 phone jack phone jack phone jack phone jack phone jack phone jack phone jack phone jack phone jack phone jack phone jack phone jack chip inductance chip inductance carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) metal film resistor metal film resistor metal film resisto...

  • Page 58

    Ad824 13 metal film resistor metal film resistor carbon resistor carbon resistor carbon resistor carbon resistor (chip) metal film resistor metal film resistor metal film resistor metal film resistor metal film resistor metal film resistor metal film resistor carbon resistor carbon resistor carbon r...

  • Page 59

    Ad824 14 metal film resistor metal film resistor carbon resistor carbon resistor carbon resistor (chip) carbon resistor (chip) carbon resistor carbon resistor carbon resistor metal film resistor metal film resistor metal film resistor metal film resistor carbon resistor carbon resistor metal film re...

  • Page 60

    Vc328100 vc328100 hf754390 hf758100 vc329200 vc327100 vc327200 vc327200 hf754470 hf754470 vc327400 vc328900 vc327400 hf754390 rd258100 vc328900 vc328900 vc328800 vc329700 vc329700 vc329600 vc329600 hf754750 hf754750 rd258100 rd258100 hf755100 hf758100 hf758100 vc328800 vc328800 vc328100 vc328100 hf7...

  • Page 61

    Ub044100 ub044100 uu148100 ub052100 ub051330 ub052100 uu147470 ub044100 uu148100 ub044100 ub044100 ub051220 ub051220 ub245100 ub245100 ur877470 vj097400 vj097400 ub052220 ub052220 ub013100 ub013100 ur819100 ub051100 ub052220 ub051100 ub044100 ub044100 uu148100 ub052100 ub051330 ub052100 uu147470 ub0...

  • Page 62

    Ub052220 ub052220 ub013100 ub013100 ur819100 ub051100 ub052220 ub051100 ub044100 ub044100 uu148100 ub052100 ub051330 ub052100 uu147470 ub044100 uu148100 ub044100 ub044100 ub051220 ub051220 ub245100 ub245100 ur877470 vj097400 vj097400 ub052220 ub052220 ub013100 ub013100 ur819100 ub051100 ub052220 ub0...

  • Page 63

    Ad824 18 monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Electrolytic cap. Electrolytic cap.-kl electrolytic cap.-kl monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Electrolytic ca...

  • Page 64

    Ad824 19 diode diode diode diode diode diode diode diode lc filter lc filter lc filter lc filter lc filter lc filter lc filter lc filter lc filter lc filter lc filter lc filter lc filter lc filter lc filter lc filter lc filter lc filter ic ic ic ic ic ic ic ic ic ic ic ic ic ic ic ic ic ic ic ic ic ...

  • Page 65

    Q204 q205 q301 -303 q304 q305 q401 -403 q404 q405 q501 -503 q504 q505 q601 -603 q604 q605 q701 -703 q704 q705 q801 -803 q804 q805 r009 r101 r102 r105 r106 r107 r108 r109 r110 r111 r112 r113 r114 r115 r116 r118 r119 r120 r121 r122 r123 r124 r125 r126 r127 r128 r129 r130 r131 r132 r133 r134 r135 r145 ...

  • Page 66

    R210 r211 r212 r213 r214 r215 r216 r218 r219 r220 r221 r222 r223 r224 r225 r226 r227 r228 r229 r230 r231 r232 r233 r234 r235 r245 -247 r248 r249 r301 r302 r305 r306 r307 r308 r309 r310 r311 r312 r313 r314 r315 r316 r318 r319 r320 r321 r322 r323 r324 r325 r326 r327 r328 r329 r330 r331 r332 r333 r334 ...

  • Page 67

    Ad824 22 metal film resistor carbon resistor carbon resistor metal film resistor metal film resistor carbon resistor carbon resistor metal film resistor metal film resistor metal film resistor metal film resistor metal film resistor metal film resistor metal film resistor metal film resistor metal f...

  • Page 68

    Ad824 23 metal film resistor metal film resistor metal film resistor carbon resistor carbon resistor metal film resistor metal film resistor carbon resistor carbon resistor metal film resistor metal film resistor metal film resistor metal film resistor metal film resistor metal film resistor metal f...

  • Page 69

    Ad824 24 metal film resistor metal film resistor metal film resistor metal film resistor metal film resistor carbon resistor carbon resistor metal film resistor metal film resistor carbon resistor carbon resistor metal film resistor metal film resistor metal film resistor metal film resistor metal f...

  • Page 70

    Ad824 25 monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Mylar capacitor (chip) mylar capacitor (chip) monolithic ceramic cap. Electrolytic cap. (chip) monolithic ceramic cap. Elec...

  • Page 71

    Ad824 26 ic ic ic ic ic ic ic bnc connector bnc connector terminal plate chip inductance chip inductance ferrite bead chip inductance chip inductance ferrite bead ferrite bead chip inductance chip inductance carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) ...

  • Page 72

    Ad824 27 monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Monolithic ceramic cap. Electrolytic cap. (chip) electrolytic cap. (chip) monolithic ceramic cap. Monolithic ceramic cap. Electrolytic cap. (chip) electrolytic cap. (chip) monolithic ceramic cap. Monolithic ceramic cap....

  • Page 73

    Ad824 28 ic ic led led led led led led led led led led led led led led led led led led led led led led led led led led led led led led led display carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor...

  • Page 74

    Ad824 29 carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor...

  • Page 75

    Ad824 30 carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor (chip) carbon resistor...

  • Page 76

    Ad824 31 power transformer lithium battery ac cord assembly ac cord assembly ac cord assembly ac cord assembly fuse fuse fuse fuse fuse fuse fuse fuse fuse fuse fuse fuse fuse fuse description f001 f001 f002 f002 f003 f003 f004 f004 f005 f005 f006 f006 f007 f007 ref no. Xy175b00 vn103500 vs228900 vs...

  • Page 77

    12 11 10 9 8 7 6 5 4 3 2 1 a b c d e f g h i j k l m n o p q 12 11 10 9 8 7 6 5 4 3 2 1 a b c d e f g h i j k l m n o p q ad824 overall circuit diagram 1/4 (main, mysl) ad824 ad824 ad824 mysl main slot rs422 word clock in 75 Ω off on com kec-92530 kec-92530 note : see parts list for details of circu...

  • Page 78

    12 11 10 9 8 7 6 5 4 3 2 1 a b c d e f g h i j k l m n o p q 12 11 10 9 8 7 6 5 4 3 2 1 a b c d e f g h i j k l m n o p q ad824 overall circuit diagram 2/4 (ad, jk) ad824 ad824 ad824 jk ad kec-92529 kec-92529 note : see parts list for details of circuit board component parts : mylar capacitor : elec...

  • Page 79

    1 2 3 4 5 6 7 8 9 10 11 12 a b c d e f g h i j k l m n o p q 1 2 3 4 5 6 7 8 9 10 11 12 a b c d e f g h i j k l m n o p q ad824 ad824 ad824 ad824 overall circuit diagram 3/4 (ha) kec - 92528 ha multiplexer buffer inverter decoder d-ff d-ff d-ff d-ff d-ff d-ff op amp op amp op amp op amp op amp multi...

  • Page 80

    1 2 3 4 5 6 7 8 9 10 11 12 a b c d e f g h i j k l m n o p q 1 2 3 4 5 6 7 8 9 10 11 12 a b c d e f g h i j k l m n o p q ad824 ad824 ad824 ad824 overall circuit diagram 4/4 (pn, dc, sw, ac) pn dc ac sw kec-92527 kec-92531 kec-92531 kec-92531 njm7815fa(xd853a00) regulator +15v 1 2 3 1: output 2: com...