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q74a service manual
q74a service manual -2- contents precautions ................................................................................................. 4 items ............................................................................................................ 6 how to connect the several cables to the lcd monitor .......................... 7 ? setting up the lcd monitor ..................................... ................................ 7 adjusting the monitor ................................................................................ 8 q74a specirications ...................................................................................... 9 ? q74a specifications .................................................................................. 9 display modes ............................................................................................ 10 powersaver ..................................................................................................... 10 osd menu .................................................................................................... 11 ? menu tree ............................................................................................ 11 factory set ................................................................................................ 12 burn-in mode ............................................................................................. 12 inverter & power ...................................................................................... 13 ? inverter & power(q74a) ........................................................................ 13 ? specification ......................................................................................... 13 ? electrical characteristics ........................................................................... 13 ? pin connection ...................................................................................... 14 troubleshooting ...................................................................................... 15 ? no operating at all ................................................................................... 15 ? doesn t display on lcd ............................................................................ 16 explode view ............................................................................................. 18 ? q74a .................................................................................................. 18 part list ..................................................................................................... 19 ? q74a mechanical part list ........................................................................ 19 ? q74a ad b/d part list ............................................................................ 20 ? q74a function key b/d part list ........................................................... 23 ? q74a function led b/d part list ........................................................... 23 ? inverter & power bd part list(flf1742-20a) .............................................. 24 ? inverter & power bd part list(flf1742-20a) .............................................. 25 circuit diagram ........................................................................................ 26 ? ad b/d(q74a) ...................................................................................... 26 ? inverter & power b/d(flf1742-20a) ........................................................ 31 pcb layout .................................................................................................... 34 ? ad b/d top silk (q74a) ....................................................................... 34
q74a service manual -3- ? ad b/d top pattern (q74a) ............................................................... .. 35 ? ad b/d bottom silk (q74a) ............................................................... .36 ? ad b/d mask top (q74a) ............................................................... ...... 37 ? ad b/d mask bottom (q74a) .............................................................. 3 8 ? func b/d top silk (q74a) ............................................................... ..... 39 ? func key b/d bottom pattern (q74a) ................................................ 39 ? func led b/d top silk (q74a) ............................................................. 39 ? func led b/d bottom pattern (q74a) ................................................ 39
q74a service manual -4- q74a precautions warning : the following information will help you avoid the risk of electric shock, serious injury, and death. z plug the power cord into a properly grounded outlet. there is the risk of electric shock. z if you hear a noise or smell smoke from the computer or adaptor, unplug the power cord immediately, and call the service center. there is the risk of electric shock or fire. z do not overload an electrical outlet with too many devices. there is the risk of fire. z do not unplug from the outlet by pulling the power cord or when your hands are wet. there is the risk of electric shock or fire. z do not bend the power cord ex cessively or place heavy objects on it. keep children and pets away from the power cord as they may damage the power cord. there is the risk of electric shock or fire. z do not use a damaged power cord or plug. make sure the plug fits snugly into the outlet. there is the risk of electric shock or fire. z do not expose the monitor to the direct sun light. z do not block the fan louvers. there is the risk of fire or damage to the monitor. z do not attempt to disassemble, fix, or modify the monitor. there is the risk of electric shock or fire. z keep the monitor away from high temperature, humidity, and dust. operating environment = 0 ~ 40 degrees celsius operating environment = 30 ~ 80 relative humidity z do not allow any object or liquid to enter inside the monitor. there is the risk of electric shock, fire, or damage to the monitor.
q74a service manual -5- caution : the following information will help you avoid the ris k of minor ofr moderate injury,or damage to the monitor. z use a proper voltage/current level indicated. z do not clean the lcd with abrasive chemicals. there is the risk of damage to the lcd. z do not scratch and damage the lcd with sharp objects. z keep the monitor away from objects and electrical appliances that may generate electromagnetic fields. z place the monitor on a flat, stable surface. the monitor may fall and there is the risk of damage or injury. z unplug the power cord when the monitor is not in use for a prolonged period of time. instruction for cleaning the monitor z make sure the power cord is unplugged. z do not spill or pour liquid on the monitor. z cleaning the lcd panel 1. use a clean, soft cloth to wipe off dust from the lcd. 2. if still not clean, wipe the lcd with a clean so ft cloth with a small amount of glass cleaner without alcohol or ammonia. z caution do not use alcohol or ammonia based cleaning products. abrasive chemicals, such as alcohol or ammonia, may damage the monitor. the company is not responsible for the damages to the monitor caused by the use of alcohol or ammonia based cleaning products.
q74a service manual items ? l c d mon i t o r ? s t an d ? po we r co rd ? 1 5 p in d - s u b c a b l e ? us e r m an u a l ? 2 4 p in d v i c a b l e * 1 ? aud i o c a bl e *2 *1 : for dvi model on l y. *2 : for a u dio model o nly. notice please m ake s u re the fol lowing items are in c l u de d with yo u r mon itor. i f any item s a re mis sing, conta c t your dealer . . -6-
q74a service manual how t o co nnect th e s e ve ral cables t o th e lc d monit o r ? setting up the lcd monitor no. nam e cable conne ctions 1 power power cord 2 pc 15-pin d-su b signal cab le 3 dvi dvi-d c a bl e * 1 4 spk i n audio c a ble * 2 5 spk out exter n al s p e aker cable * 2 *1 : for dvi model on l y *2 : for aud io model onl y -7-
q74a service manual adjus ting the monit o r t h e fu nctio n c ont r ol b u ttons h o w to u s e t h e f u n c t io n k e y menu k ey: 1 . fir s t cli c k : the os d m a in men u appe ar s . 2 . s e co nd c li ck : the o s d m ain m e nu dis ap pear s. s e lect k ey : s elect a co mmand f un ct io n. d o wn k ey : 1 . move the on-screen highlighted comand i tem to the nex t on e. 2 . decre a se the c urre nt option va l u e. mu te k ey : * 2 s o u n d m u t e o n / o f f b u t t o n . u p key : 1 . move th e on-screen highlighted c omand i t e m t o t h e p r e v i o u s o n e . 2 . inc r ea se t h e cu rrent o p t ion v a l u e. au to k ey : *1 t his will optimi ze i mage q uality automaticall y . mwe key : you can man u ally a djust the screen to your e n v i r o n m e n t o n t h e c o m p u t e r . ex.) in t ernet, gam es, mo vies ... *1 : for ana log mode on ly , *2 : for audio model only. -8-
q74a service manual q74a specirica t ions ? q74a specifications mode a na log digita l type t ft active matrix 17 inc h siz e 337.92 x 270.336 (mm) pixel pitch 0 .264 x 0.264 (mm) panel d i spla y colo r 8 -bit ( 16,77 7,216 c o lors) ba sic 1280x1 024 @60hz displ a y resolution ma ximu m 1280x1 024 @75hz 1280x1 024 @60hz horiz o nta l 31.5 ~ 80khz 31 ~64k hz frequen c y v e rtica l 56 ~ 75hz 59 ~ 61hz 15 pin d -sub 24pin d vi-d connectors speaker inp u t/head phon e o utput(audio cable) *1 tilting degr ee (u/d) -5 ~ 20 d egree plug&play vesa ddc 1/2b inpu t interna l t ype : 100~240v a c,50/ 60hz, 0 .5a consu m ptio n under 40w ( spea k e r max 4w * 1) power standby mo d e 1 w less power ma nagement p owersa ver tempera t u r e 0~25 ( 32H~77H) environmental consideration humidity 90% less dimensions o utside 387mm * 185mm * 396mm (w* d *h) weight 3 .9kg *1 : for aud io model onl y notic e this m onitor can be in stalled on a n y p l u g & p l a y c o m p a t i b l e s y s te m. intera c t ion of t he m oni t or a nd c o m puter systems will p rovide th e be s t operating conditions a nd m onitor s ettings. i n most c ases, monit or instal lation w ill procee d autom a tically , un less t he u ser wishes t o s e l e c t alternate se t t ings. -9-
q74a service manual -10- display modes mode resolution horizontal frequency(khz) vertical frequency(hz) pixel clock (mhz) sync polarity(h/v) 720 x 400 31.468 70.087 28.322 -/+ 31.468 59.940 25.175 -/- 35.000 66.670 30.240 -/- vga 640 x 480 37.500 75.000 31.500 -/- 37.879 60.300 40.000 +/+ 48.077 72.188 50.000 +/+ svga 800 x 600 46.875 75.000 49.500 +/+ 48.363 60.004 65.000 -/- 56.476 70.000 75.000 -/- xga 1024 x 768 60.023 75.029 78.750 +/+ 63.981 60.020 108.000 +,-/+,- sxga 1280 x 1024 79.976 *1 75.025 *1 135.000 *1 +/+ *1 *1 : for analog mode only. powersaver state power consumption recovery time led color on under 40w - green off less than 1w within 2 sec amber
q74a service manual -11- osd menu ? menu tree main menu sub menu function description brightness control of brightness contrast control of contrast h position control of horizontal position v position control of vertical position phase control of phase clock control of horizontal clock picture auto adjust automatic adjust position bluish color te mperature 9300k (some blue color) redish color te mperature 6500k (some red color) user red : 0 ~ 100 green : 0 ~ 100 blue : 0 ~ 100 color auto color automatic adjust color osd h posi moves the osd menu osd v posi moves the osd menu osd timer osd display time osd transparency osd transparency language select osd language recall factory default values input select dvi, analog mode change audio sound mute on/off function. *1 misc volume you can adjust the volume. *1 *1 : for audio model only
q74a service manual -12- factory set osd menu => misc => recall => yes. every value changes factory setting value. after factory set executes, power off ? power on automatically. you must push the ?auto? button because of optimum image quality automatically. when user want factory setting value, you must execute this function. burn-in mode if you push the down button more than 5 seconds in disconnected signal cable status, you can see changed color. burn-in mode displays chaged color continually. (white, red, blue, green etc.) we can check normal operating status of the monitor under mass production. if you want to finish burn-in mode, you can turn off the power by only push the power button.
q74a service manual -13- inverter & power ? inverter & power(q74a) z l.i.p.s : lcd inverter power system(flf1742-20a) ? specification z operate 4 ccfl lamps. z current feedback control z input voltage : dc 12v. z when any lamp doesn?t operate, the panel is under protection status. protection status means that ci rcuit protect the other lamp. z pwm control. z remote power on/off control z high efficiency ? electrical characteristics description min typ max sign remark input voltage 11.0 12.0 13.0 vin input current 1.5 1.7 1.9 a 12vdc output current 5.0 6.0 7.0 marms 1ccfl current lamp frequency 40 47 55 khz normal operation on vin=12v on/off=5v on/off control shunt-down(lamp off) off vin=12v on/off=0v kick-off voltage more than 1100 vrms kick-off
q74a service manual -14- ? pin connection - input connector con1 pin no. symbol descripition 1,2 vin 1 input voltage : 12v 3,4,7 gnd gnd 5,6 vin 2 inopt voltage : 5v 8 on/off power system return 9 nc nc - output connector cn1,2,3,4 pin no. symbol descripition 1 hv1,2,3,4 hi voltage terminal 2 lv1,2,3,4 lov voltage terminal
q74a service manual -15- troubleshooting ? no operating at all what you see suggested actions is the power inserted correctly? insert the plug correctly referring to the user manual. does the power adapter operate correctly? check the power adapter. the green led is ok. the power adapter op erates correctly, but the lcd monitor does not operate correctly. check the harness of the func. b/d. does the power on/off and the led operate corretly? if the program of the micom is error, then exchange the micom. if the ad b/d is error, then exchange the ad b/d. the power on/off and the led operate correctly, but the osd menu doesn?t display on screen. first, operate the factory set. second, check the panel harness that is connected to the ad b/d. check the lamp harness of the panel. lastly, exchange the lips. the osd menu operates correctly but the image doesn?t display on screen. insert the signal cable correctly referring to the user manual. check the lamp harness of panel and inverter. lastly, check the lamp of panel. the power on/off operates correctly, but the screen is ?all white?. the lamp is ok. check the panel harness that is connected to the ad b/d. the power on/off operates correctly, but the screen is ?all black?. check the lamp cable. check or exchange the lips. check the panel cable.
q74a service manual -16- ? doesn?t display on lcd ? video mode not supported ? message [windows] reboot safe mode. (press the f8 key during booting). remove graphiccard driver. reboot normal mode. reinstall graphiccard driver. ?no signal? message check the signal cable. check dpms mode in pc. check pins of the signal cable. if pc keeps dpms status continually (no signal input, led color amber) check the signal cable. check pins of the signal cable. check hs_vga and vs_vga in schematics. doesn?t display on screen correctly include osd menu check scaler output signal. check panel harness between panel and ad b/d. check solder status of the scaler. doesn?t display on screen correctly except osd menu check the signal cable. check scaler input signa l (rgb,h-sync,v-sync) noise in vertical pattern. execute auto adjust. according to graphic card. check 60hz vertical frequency in display properties. display position error execute auto adjust display position error occurred on dark or moving picture.(like game) in this case, you must execute auto config in windows screen.
q74a service manual -17- color error include osd menu check the panel harness. check scaler output signal. color error except osd ment. check the signal cable. check pins of the signal cable. check input/output signal of the signal cable key button error check the function(key) harness. check the function ass?y (mechanical). brightness differ between upper and lower on screen. because of viewing angle.
q74a service manual explode vi ew ? q74a -18-
q74a service manual pa r t l i s t ? q74a mechanical p a rt list -19-
q74a service manual -20- ? q74a ad b/d part list location parts code parts name parts spec. remar k ce16 cexf1c471a c electro 16v 470uf 20% 10x12.5 tap ce5,ce6,ce12, ce13,ce14, ce15 cexf1c101a c electro 16v 100uf 20% 6.3x11 tap ce7, ce8, ce9, ce10, ce11 cexf1c100a c electro 16v 10uf 20% 5x11 tap con1 97e6200710 conn wafer 12507wr-30000 (30p lvds) c6, c7, c8, c10, c11, c12, c18,c19, c20, c21, c22, c23, c24, c25, c26, c27, c28, c29, c30, c31, c34 , c37, c38, c39, c40, c41, c42, c43, c44, c45, c46, c47, c48, c49 hcck104zba c chip cera 50v 100nf z 1608 c9 hcch103kba c chip cera 25v 10nf k 1608 c13, c14, c15 hcck200jba c chip cera 50v 20pf j 1608 hcck330jba c chip ce ra 50v 33pf j 1608 c17 hcck221jba c chip cera 50v 220pf j 1608 c35, c36 hcck101jba c ch ip cera 50v 100pf j 1608 c32, c33 hcck220jba c chi p cera 50v 22pf j 1608 dz1, dz2, dz3 , dz4, dz5, dz6 dudzs5.6b- zenor diode udz s 5.6b(sod-323), rohs ??? dz7 dzmm55c5v6 zener diode zmm55c5v6 d2, d3, d4, d5, d6, d7, d8, d9, d10d11, d12, d13, d14,d15, d16 dbav99---- chip diode bav99 (sot-23) fb4, fb5, fb7 hfa1608121 bead chip cim10j121nc(bead_120 ohm_1608) fb3, fb6, r60 hrfs000jba r chip 1/16w 0 ohm j 1608
q74a service manual -21- fb8 hfa3216121 bead chip cim31j121ne (bead_120ohm_3216) j4 97e6200110 15-pin d-sub hdr10-15f-rl j5 97e6200734 conn wafer ibp-07r-20t(gil-s-7p-s2l2-ef) : right angle j6 97e6200790 dvi_29pin 361r02-0 j7 99e6203095 conn wafer ibp-09s-20t(gil-s-9p-s2t2-ef) : q4, q5 tsbt3904-b tr chip sbt3904 q2, q3 tsbt3906-b tr chip sbt3906 r21, r24, r26, r41, r42, r43 , r52, r53, r64, r65 hrfs103jba r chip 1/16w 10k j 1608 r20 hrfs222jba r chip 1/16w 2.2k j 1608 r27, r28, r45, r46 , r50, r54, r55, r57, r58, r59, r61, r66, r100, r101 hrfs472jba r chip 1/16w 4.7k j 1608 r7, r8, r9, r10, r11, r12, r13, r14 r15, r16, r22, r51 hrfs101jba r chip 1/16w 100 ohm j 1608 r17, r18, r19 hrfs750jba r chip 1/16w 75 ohm j 1608 r23, r25 hrfs201jba r chip 1/16w 200 ohm j 1608 r29, r30, r31, r33, r35, r36, r37r38, r39, r40 hrfs100jba r chip 1/16w 10 ohm j 1608 r32, r34 hrfs220jba r chip 1/16w 22 ohm j 1608 r44 hrfs821jba r chip 1/16w 820 ohm j 1608 r47, r48 , r67, r68 hrfs330jba r chip 1/16w 33 ohm j 1608 r49 hrfs391jba r chip 1/16w 390 ohm j 1608 r56 hrfs223jba r chip 1/16w 22k j 1608 r62 hrfs104jba r chip 1/16w 100k j 1608 r63 hrfs122jba r chip 1/16w 1.2k j 1608 u2 1a111733dc ic regulator apl1117-33uc-tr(to-252) u3 1ap1117e18 ic regulator ap1117e18a, sot223-3l u4 1tsum56al- ic scaler tsum56al-lf ( mstar ) u5 1at24c02n- ic eeprom at24c02n-10su-2.7 , lead free u6 1fdc6329l- ic loadswitch fdc6329l supersot tm-6 , rohs u7 1ps25lv512 ic flash memory ps25lv512 ( mstar ) , 512kbit ,
q74a service manual -22- u8 1at24c16-- ic eeprom (atmel) at24c16n-10su-2.7(soic 8p), rohs ??? x1 5xj14r318e crystal quartz 14.3181mhz xtal2 20pf dip ce1, ce4 cexf1c471a c electro 16v 470uf 20% 10x12.5 tap ce2, ce3 cexf1c102a c electro 16v 1000uf 20% 10x16 tap c1, c2 hcck104zba c chip cera 50v 100nf z 1608 c5 hcck105zba c chip cera 50v 1uf z 1608 c3, c4 hccf474mba c chip cera 16v 470nf m 1608 c3, c4 hccf474kba c chip cera 16v 470nf k 1608 d1 dzn4002--- diode 1n4002 100v 1a t-26 fb1, fb2 hfa1608121 bead chip cim10j121nc(bead_120 ohm_1608) j1 97e6200600 conn wafer 53014-0410 j2, j3 97e6300220 stereo jack st-320 (5p 3.5pi) q1 tsbt3904-b tr chip sbt3904 r4 hrfs472jba r chip 1/16w 4.7k j 1608 r2 ,r3 hrfs103jba r chip 1/16w 10k j 1608 r5, r6 hrfs303jba r chip 1/16w 30k j 1608 r1 hrfs304jba r chip 1/16w 300k j 1608 u1 1tda7496l- ic audio tda7496l(st) -red calor : dvi part -blue calor : audio part
q74a service manual -23- ? q74a function key b/d part list location parts code parts name parts spec. a/j remark pcb 97e6500843-00 function_pcb 1 layer(102.5*15mm) hl711s/d j1 99e6203075 conn wafer ibp- 07s-20t(gil-s-7p-s2l2-ef) j2 99e6203045 conn wafer ibp-04s -20t(gil-s-4p-s2t2-ef) r1,r2 hrfs152jba r chip 1/6w 1.5k j 1608 r3 hrfs302jba r chip 1/6w 3k j 1608 sw1,sw2, sw3,sw4, 5s51280a6- tact switch 1280a6 (knob-5mm) ? q74a function led b/d part list location parts code parts name parts spec. a/j remark pcb 97e6500844-00 led function_pcb 2 layer(41.5*15mm) hl711s/d j1 99e6203045 conn wafer ibp-04s -20t(gil-s-4p-s2t2-ef) led dlsam3270- led led 3pai 3pin(2.54-pitch) sw5 5s51280a6- tact switch 1280a6 (knob-5mm)
q74a service manual ? inverter & power bd part list(flf1742-20a) n o . r e f . p a r t ty p e 1 s t . v e n d o r 2 n d . v e n d o r q , t y 1 l f 101 l f l 002a ? ? g e t 1 2 p c 1 0 1 l t v - 81 7b - m , t c e t 1103 l i t o n v i s h a y 1 3 b d 101 k b p 206g t s c 1 4 d 1 04, 10 5 s b 560 v i s h a y - g s d i o d e s 2 5 d 1 0 3 m b r 10h 1 50c t v i s h a y - g s 1 6 c 105 c e 8 2 u 4 00v 85 s d , s h l , g s ? ? , ? ? , ? ? 1 7 c 103 , 104 k n b 1560m k p - 3 34k i s k r a p i l c o , ? ? 2 8v s 1 v a r i s t o r 7 d 4 7 1 i l j i n ( a m o t e c h ) c n r 1 9 c 101 , 102 d g 1 02y 1 ? ? , ? ? 2 1 0 c 106 d g 2 22y 1 ? ? , ? ? 1 1 1 c 2 c e 2 20u 25 v 105l x z , w l , r t ? ? , ? ? , ? ? 1 1 2 c n 10 0 s c - 8r - f 152p 32r -g b s u p e r c o m 1 1 3 c n 1 0 1 g i l - s -9 p - s 2 t 2 -e f l g ? ? 1 1 4 i c 101 f s d m 0 565r f a i r c h i l d 1 1 5 c n 1, 2, 3, 4 3 5002w r - 02, j e 2 0 7 - b 1t - 0 2 ? ? j a e e u n 4 1 6 t 101 t r s l 01 4a ? ? g e t 1 1 7 t 3 t r s 1801u - d i p ? ? , ? ? ? ? 1 1 8 u 1 , 2 a p 4511 g d - d i p a p e c 2 1 9 u 3 b i t 3105 - d i p b i t e k 1 2 0 d 1 01 r s 1 j , u f 4007 t s c s h s 1 2 1 z d 104 z y 160 s h s 1 2 2 d 2 , 4 d a n 217 , b a v 99 r o h m d i o d e s 2 2 3 d 5 d a p 202 u r o h m 1 2 4 z d 1, 2, 3 u d z s 5 . 6 b , b z t 5 2c 5v 6s - 7 r o h m d i o d e s 3 2 5 z d 102 u d z s 1 0 b , b z t 5 2c 10v 0s r o h m d i o d e s 1 2 6 z d 101, 1 0 3 u d z s 2 0b , b z t 5 2 c 20v 0s r o h m d i o d e s 2 2 7 q 1 2 n 3904 , m m b t 3 904 r o h m d i o d e s 1 2 8 c 1 , 1 7 c c 106z 10v 3 216 ? ? , t d k ???? 2 2 9 c 8 c c 473k 50 v 2012 ? ? , t d k ???? 1 3 0 c 1 3 c c 271k 50 v 2012 ? ? , t d k ???? 1 3 1 c 6 , 7 , 9 , 12, 2 0 c c 103k 50 v 2012 ? ? , t d k ???? 5 3 2 c 11, 22, 24, 122 c c 104k 50 v 2012 ? ? , t d k ???? 4 3 3 c 3 , 4 , 14, 19 , 119 c c 105z 16v 2 012 ? ? , t d k ???? 5 3 4 r 1 16, 11 7 c r 2 012j 2 0 0 ? ? r o h m 2 3 5 r 1 14, 11 5 c r 2 012j 1 8 1 ? ? r o h m 2 3 6 r 2 8, 29 c r 2 012j 2 2 1 ? ? r o h m 2 3 7 r 1 21 c r 2 012j 1 2 2 ? ? r o h m 1 38 r 1 19, 12 2 c r 2 012j 3 3 2 ? ? r o h m 2 39 r 1 , 16, 20 , 22, 24 c r 2 012j 1 0 3 ? ? r o h m 5 4 0 r 2 , 3 , 1 0 c r 2 012j 1 8 3 ? ? r o h m 3 -24-
q74a service manual ? inverter & power bd part list(flf1742-20a) n o . r e f . p a r t t y pe 1 s t . v en d o r 2 nd . v e nd o r q , t y 41 r 1 2 c r 2012 j 433 ?? r o h m 1 42 r 2 6 c r 2012 j 753 ?? r o h m 1 43 r 1 1 c r 2012 j 134 ?? r o h m 1 44 r 5 c r 2012 j 154 ?? r o h m 1 45 r 8 , 2 5 c r 2012 j 224 ?? r o h m 2 46 r 9 c r 2012 j 824 ?? r o h m 1 47 r 2 7 c r 2012 j 105 ?? r o h m 1 48 r 15, 19 c r 2012 f 3600 ?? r o h m 2 49 r 126 c r 2012 f 1431 ?? r o h m 1 50 r 123 c r 2012 f 1801 ?? r o h m 1 51 r 124 c r 2012 f 2702 ?? r o h m 1 52 r 101, 102, 103 c r 3216 j 334 ?? r o h m 3 53 r 111 r d 1 / 4 w j 3. 9 o h m ?? ?? ?? ?? ? 1 54 r 105, 106 r d 1 / 4 w j 33k o h m ?? ?? ?? ?? ? 2 55 c 112 22 1k 1 k v ?? ? ? 1 56 c 113 22 2k 1 k v ?? ? ? 1 57 c 115 c e 680u 25v 105r d , km ? ? , ? ? , ? ? 1 58 c 117, 118 c e 1000 u 10v 105r d , km ? ? , ? ? , ? ? 2 59 c 110 c e 47u 5 0 v 85/ c e 47u 50v 1 0 5 ?? , ? ?, ?? 1 60 i c 102 t l 431a f a i r c h i l d ? ? 1 61 b c 102 e b f l 001a ? ? ? ? g e t 1 62 c 5 , 1 0 c l 100k 3k ? ? ? ? ? ? 2 63 d 102 p r 1003, f r 104 d i o d e s ? ? ? ? ? 1 64 t h 101 s c k 08053m s , n t c 5d - 9 t h i n k i n g ? ? ? ? ? 1 65 f 101 s r - 5 3 . 1 5 a ?? ?? ? 1 66 p . w. b f r - 1 p l 1742c 20 ? ? ? ? 1 -25-
q74a service manual -26- circuit diagram ? ad b/d(q74a)
q74a service manual -27- q74a service manual -27-
q74a service manual -28- +5 v bt 1 3 1 + c e 1 1 1 0 uf / 1 6 v bk l t - e n tp 3 1 a v d d _p ll_3. 3 +5 v +5 v q5 s b t 3904 3 1 2 r6 0 0 r 2 6 1 0 k c 3 2 22p rx e c - r 2 4 1 0 k fla sh _me mo ry j5 3 2 4 5 1 6 7 ke y 1 ke y 2 gn d le d _ r gn d le d _ g vc c gi n r5 5 4. 7k rx o 3 + r6 2 100k d8 ba v9 9 1 2 3 u8 at 2 4 c1 6( s o i c ) 1 2 3 4 5 6 7 8 a0 a1 a2 gn d s d a sc l wp vc c bt 7 1 a v d d _a d c _3. 3 in v _ o n tp 2 9 1 bt 4 1 bt 9 1 bt 1 2 1 bt 5 1 r 5 2 1 0 k vd d c _ 1 . 8 bt 2 5 1 bt 1 4 1 sd a_ d v i rx e 1 - so g i n bt 1 6 1 gn d _ p o w e r rx o 0 - +5 v bt 1 0 1 r6 7 3 3 d7 bav 9 9 1 2 3 r27 4 . 7 k de t dv i bt 2 1 1 bt 6 1 bt 1 8 1 vd d p _ 3 . 3 tp 5 1 rx o 0 - r5 1 100 v ddc _ 1 . 8 c3 9 0. 1uf st _ d et pa nel _i nte rf ace ds da ri n rx e 3 + r 2 5 2 0 0 +5 v ke y_ int er fac e rx 1 + r 5 7 4 . 7 k rx o 2 - r6 8 3 3 rx e c + rx e 3 - bt 2 0 1 r5 0 4. 7k tp 3 0 1 m u t e ri nm v d d p _3. 3 r5 4 4. 7k rx e c - rx e 3 - bt 3 1 r 5 9 4 . 7 k bt 2 2 1 bt 8 1 c 3 3 22p a v d d _m p ll_3. 3 rx o 1 + bt 2 3 1 rx e 0 - r 4 1 1 0 k r3 2 2 2 rx e 0 + rx o c + c4 1 0. 1uf in v _ o n r 6 4 10k tp 2 8 1 rx o c - r100 4. 7 k q2 s b t 3 906 2 1 3 on _p an nel r42 1 0 k rx o 2 + q4 s b t 390 4 bk l t - v br i o n _p annel rx e 0 + co n 1 1 2507 w r - 3 0 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 3 1 3 2 vd d p _ 3 . 3 e epr om bi n rx e 3 + rx e 0 - bt 2 1 rx e 2 - rx o 2 + r 4 9 390 rx 2 - rx 2 + + ce 1 4 100uf / 1 6 v av d d _ d v i _ 3 . 3 rx o 2 - r28 4 . 7 k 0 sc a l er & pa n e l h l 7 20d ti t l e d o c u m ent n u m ber r e v s heet of d esi g n c h e c k app r o va l w ooy ou ng t e l e c o m c o . , lt d. m odel rx c - c 3 8 0 . 1uf sc l _ d vi bt 1 9 1 gi n m r 2 3 2 0 0 rx o 0 + rx e 2 - bt 1 5 1 r 5 3 1 0 k c4 4 0. 1uf rx c + rx o 3 - +5 v ds cl rx e c + c4 2 0. 1uf c4 3 0. 1uf rx 0 - rx o 1 - rx e 2 + r6 1 4 . 7 k rx e 1 + r3 4 2 2 rx o 3 - rx o 1 - + ce 1 5 100 uf / 16v x1 14. 3 18m h z bt 1 1 c 4 8 0 . 1 u f q3 s b t 390 6 2 1 3 di m _ a d j u6 f d c 632 9l 4 5 6 3 2 1 yt n on- o f f r 1_c 1 v_ o u t 2 v_ o u t 1 r2 rx e 2 + bt 2 6 1 d i m _ a d j c 4 9 0 . 1 u f rx o c + p s 25 l v 51 2( s o i c ) u7 1 2 3 4 5 6 7 8 cs so wp gn d s i sc k ho l d vc c bt 2 7 1 c4 0 0. 1uf rx o 3 + rx o 0 + r 5 8 4 . 7 k hs y n c rx 1 - r 6 5 10k r6 6 4. 7k scaler & panel tp 4 1 +5 v tp 3 1 1 vo l u m rx o c - vsy n c e r 1 01 4. 7 k dv i_i np ut rx e 1 + c 3 7 0 . 1uf bt 2 4 1 rx 0 + rx o 1 + rx e 1 - c4 5 0. 1uf r6 3 1. 2k vd d p _ 3 . 3 r5 6 223 u4 t s u m 56al- lf 3 3 3 2 30 29 18 3 5 3 4 19 31 4 1 4 2 4 0 16 17 80 81 78 79 55 61 72 82 94 56 62 73 83 95 58 64 85 57 63 84 4 7 28 27 2 14 11 8 5 25 26 23 24 22 20 21 1 4 8 4 9 5 0 51 52 53 54 15 4 3 3 7 3 6 3 8 3 9 76 77 70 71 74 75 96 97 92 93 90 91 86 87 88 89 4 4 4 5 4 6 66 69 3 4 6 7 10 12 13 59 60 65 67 68 100 99 98 9 g n d v d d p dd ca _ s d a gn d bi n 0 p g p i o _ p 15/ p w m 0 v d d c gi n 0 m ddca _ s c l g p i o _ p 2 3 g p i o _ p 2 2 s d i a v d d _p ll bi n 0 m by p ass v c t r l lv b 0 m gn d lv a 3 m lv a 2 m lv b 2 m v d d c g p i o _ p 13 vd d p l va1 p l vb1 p g n d g p i o _ p 14 l vac kp l va0 p g p i o _ p 12 gn d lv a 1 m r s t g p i o _ p 24/ p w m 2 vs y n c 0 hs y n c0 gn d av d d _ d vi gn d av d d _ d vi gn d re f m re f p ri n 0 p av d d _ a d c ri n 0 m gi n 0 p s ogi n 0 dd cd_ s c l g p i o _ p 27/ p w m 1 v d d p g n d vd d c mo d e [ 0 ] mo d e [ 1 ] l va3 p re x t g p io _ p 1 1 / i 2 c _ m d a s d o n c c s z s c k gn d l vb0 p lv b c k m l vb2 p lv b 1 m vd d p xi n x o u t g p i o _ p 07 g p i o _ p 2 6 / p w m 0 g p i o _ p 02 / s a r 3 g p i o _ p 06 g p i o _ p 2 5 / p w m 1 r s t n g p i o _ p 00 / s a r 1 g p i o _ p 01 / s a r 2 g p io _ p 1 0 / i 2 c _ m c l n c n c vd d c l vbc kp r+ r- g+ g- b- ck + ck - lv a c k m l va2 p lv a 0 m l vb3 p lv b 3 m d d c d _ s d a g p i o _ p 1 6 / p w m 2 a v d d _ m p l l b+ bt 1 7 1 v ddp _ 3 . 3 bt 1 1 1 c4 7 0. 1uf bi n m
q74a service manual ce 4 470 uf / 16v fb 1 bead _12 0ohm _1608 r5 30k gn d c2 0. 1uf c4 470nf fb 2 bead _12 0ohm _1608 c3 470nf r4 4. 7k volu m e ai n - r tp 1 1 ce 3 1000 uf / 16v +5 v audio_part r1 30 0k d1 1n 4002/ d i p 1 2 ce 2 1000 uf / 16v j1 1250 7w r- 04 a 1 2 3 4 lef t gn d gn d ri g h t s pea ker w afe r r3 10k q1 sbt 39 04 1 2 3 c5 1uf ai n - r ce 1 470uf / 16v tp 2 1 ai n - l u1 t d a74 96l 12 1 11 2 3 20 19 5 6 7 4 8 10 9 13 16 14 15 18 17 mu t e g1 st by g2 g3 g20 g19 var ou t - l vol var ou t - r li n nc svr ri n p13 vc c r_ o u t vc c g18 l_ o u t + 12v mu te ai n - l r2 10k j2 s t - 320 2 3 4 5 1 aud io inp ut j3 s t - 320 2 3 4 5 1 r6 30k c1 0. 1u f -29-
q74a service manual -30- d1 1 ba v99 1 2 3 c 3 5 100pf sd a - d v i d9 ba v9 9 1 2 3 9 rx 0 - +5 v c4 r3 1 1 0 r4 8 3 3 d1 2 ba v99 1 2 3 r4 6 4. 7k rx 2 - d1 3 ba v9 9 1 2 3 d1 6 ba v9 9 1 2 3 c 3 6 1 0 0 p f d1 4 ba v9 9 1 2 3 de t _ d v i j6 d v i _30p 3 2 1 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 31 34 3 2 1 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 c1 c2 c3 c4 c5 3 1 3 4 rx 2 - r4 5 4. 7k rx 1 - sd a _ d v i rx 0 + u5 at 24 c 0 2( s o i c ) 1 2 3 4 5 6 7 8 a0 a1 a2 vs s sd a sc l wp vc c d z 4 udz s 5 . 6 b 1 2 8 r3 5 1 0 r4 4 8 2 0 24 rx c+ c1 rx c- r2 9 1 0 rx 0 - d v i ( d i g t ia l v i sua l i n t e r f a ce ) 29p 0 dv i i n p u t h l 720d ti t l e do c u me n t nu mb e r re v s hee t of de s i g n che ck a p p r o v a l w o o y o ung t e l e c o m c o . , lt d. m odel rx 2 + rx 0 + r4 7 3 3 dvi_input sc l_ d v i c 3 4 0 . 1uf rx c+ r3 7 1 0 e e p _ r o m +5 v rx c- r4 0 1 0 rx 1 - d1 0 ba v9 9 1 2 3 rx 1 + de t _ d v i sc l - d v i d z 5 udz s 5 . 6 b 1 2 16 1 r4 3 1 0 k d z 6 udz s 5 . 6 b 1 2 d1 5 ba v9 9 1 2 3 +5 v r3 3 1 0 c2 rx 1 + r3 6 1 0 r3 9 1 0 rx 2 + 17 r3 0 1 0 c3 r3 8 1 0
q74a service manual -31- le d _ g r e e n r2 1. 5k j1 co n 8 7 6 5 4 3 2 1 gnd 5v key 2 l e d_ re d sw 4 st s-1 1 0 2 a-1 sw 2 st s-1 1 0 2 a-1 gn d r3 3k gn d gn d r car bon film( t-52 small ) r1 1. 5k j2 co n4 1 2 3 4 sw 1 st s-1 1 02 a-1 ke y 1 sw 3 st s-1 1 02 a- 1 le d _ r e d led 1 sam 5270 3 2 1 le d _ g r een sw 5 st s - 1102a-1 ke y 1 gnd j3 co n4 4 3 2 1
q74a service manual ? inverter & power b/d(flf1742-20a) - adapter cutcuit -32-
q74a service manual -inverter c i r c uit -33-
q74a service manual -34- pcb layout ? ad b/d t o p silk (q74a)
q74a service manual ? ad b/d t o p p a tt ern (q74a) -35-
q74a service manual ? ad b/d bott om silk (q74a) -36-
q74a service manual ? ad b/d mask t o p (q74a) -37-
q74a service manual ? ad b/d mask bott om (q74a) -38-
q74a service manual ? func b/d t o p silk (q74a) ? func key b/d b o tt om p a tt ern (q74a) ? func led b/d t o p silk (q74a) ? func led b/d b o tt om p a tt ern (q74a) -39-

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