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service manual color television chassis : cn-001g model s/m no.:tcn001gef0 dtq-14p2/p3fcg dtq-14p2/v1fcwg/p2scg dtq-14v1/v5fcg/v1/v4scg dtq-14v5fcng/15u5scg dtq-14v6fcbg/fcpg/fbbg/fppg DTQ-14J4fcgg/fccg dtq-20v1/v4/v5fcg dtq-20v1/v4scg dtq-20p2/p3fcg/p2scg u.s.a canada (ac120v) dtq-14v6nbg/npg dtq-14v1/v3/v5fsg dtq-14v1/v3/v4/v5/v8/v9ssg dtq-14u1fsg/ssg/20u1fsg/ssg dtq-20p2ssg/15u5fsg/ssg/15u7ssg dtq-20v1/v3/v4fsg dtq-20v1/v3/v4/v5/v8/v9ssg middle america (ac 1 10v) dtq-14v1/v4/v5fspg dtq-14v1/v4/v5/u1sspg dtq-14v6nbpm/nppg dtq-20v1/v4fspg dtq-20v1/v3/v4/u1sspg dtq-15u5sspg dtq-14v1/v4/v8ssfg dtq-20v1/v4/v8ssfg dtq-14v4/20v4fcfg chile, peru, philippines (ac220v) (ac90~250) korea, usa, japen(ac90~260v) http : //svc.dw e .c o .kr c a u t i o n : i n t h i s m a n u a l , s o m e p a r t s c a n b e c h a n g e d f o r i m p r o v i n g . t h e i r p e r f o r m a n c e w i t h o u t n o t i c e i n t h e p a r t s l i s t . s o , i f y o u n e e d t h e l a t e s t p a r t s i n f o r m a t i o n , p l e a s e r e f e r t o p p l ( p a r t s p r i c e l i s t ) i n s e r v i c e i n f o r m a t i o n c e n t e r ( h t t p : / / s v c . d w e . c o . k r ) daewoo electronics corp.
1 table of contents appendix (appendix is provide only by internet [http://svc.dwe.co.kr]) safety precautions .................................................................................................................... 2 product safty servicing guidelines for audio - video producs ......................................... 2 product safty servicing guidelines for color television receivers ............................. 3 specifications ............................................................................................................................... 5 block diagram .............................................................................................................................. 6 alignment instructions ............................................................................................................ 7 service mode adjustments .................................................................................................................. 7 assembly adjustments .......................................................................................................................... 8 parental control password settings ........................................................................................... 12 voltage chart .............................................................................................................................. 13 waveforms ................................................................................................................................ ...... 16 schematic diagram ...................................................................................................................... 19 exploded view ............................................................................................................................... 20 electrical parts list ................................................................................................................. 28 ic description ................................................................................................................................ 1 trouble shooting chart s ........................................................................................................ 7 no power ................................................................................................................................ ..................... 7 no pictur e ................................................................................................................................ ................... 8 no soun d ................................................................................................................................ ...................... 9 ch don ? t m e mo r y o r ch s k ip .............................................................................................................. . .. 10 no colo r ................................................................................................................................ ...................... 1 1 no vertical deflection ......................................................................................................................... 1 1 no on-screen disply ............................................................................................................................... 1 2 remote control does not operate ................................................................................................. 1 2 2 product safety servicing guidelines for audio - video products caution : do not attempt to modify this product in any way. never perform customized installations without manufac- turer's approval. unauthorized modifications will not only void the warranty, but may lead to your being liable for ant result- ing property damage or user injury. service work should be performed only after you are thor- oughly familiar with all of the following safety checks and servicing guidelines. to do otherwise, increases the risk of potential hazards and injury to the user. while servicing, use an isolation transformer for protection from a.c. line shock. safety checks after the original service problem has been corrected, a check should be made of the following: subject:fire & shock hazard 1. be sure that all components are positioned in such a way as to avoid possibility of adjacent component shorts. this is especially important on those modules which are trans- ported to and from the repair shop. 2. never release a repair unless all protective devices such as insulators, barriers, covers, shields, strain reliefs, power supply cords, and other hardware have been reinstalled per original design. be sure, that the safety purpose of the polarized line plug has not been defeated. 3. soldering must be inspected to discover possible cold sol- der joints, solder splashes of sharp solder points. be cer- tain to remove all loose foreign particles. 4. check for physical evidence of damage or deterioration to parts and components, for frayed leads, damaged insulation (including a.c. cord), and replace if necessary. follow origi- nal layout, lead length and dress. 5. no lead or component should touch a receiving tube or a resistor rated at 1 watt or more. lead tension around pro- truding metal surfaces must be avoided. 6. all critical components such as fuses, flameproof resistor, capacitors, etc. must be replaced with exact factory types. do not use replacement components other than those speci- fied or make unrecommended circuit modifications. 7. after re-assembly of the ste always perform an a.c. leakage test on all exposed metallic parts of the cabinet. (the chan- nel selector knob, antenna terminals, handle and screws) to be sure the set is safe to operate without danger of electri- cal shock. do not use a line isolation transformer during this test use an a.c. voltmeter, having 5000 ohms per volt or more sensitivity, in the following manner : connect a 1500 ohm 10 watt resistor, paralleled by a .15 mfd. 150v a.c. type capaci- tor between a known good earth ground (water pope, con- duit, etc.) and the exposed metallic parts, one at a time. measure the a.c. voltage across the combination of 1500 ohm resistor and .15 mfd capacitor. reverse the a.c. plug and repeat a.c. voltage measurements for each exposed metallic part. voltage measured must not exceed .75 volts r.m.s this corresponds to 0.5 milliamp a.c. nay value exceeding this limit constitutes a potential shock hazard and must be corrected immediately. subject : graphic symbols the lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the service personnel to the pres- ence of uninsulated ?dangerous voltage? that may be of sufficient magnitude to con- stitute a risk of electric shock. the exclamation point within an equilateral triangle is intended to alert the service personnel to the presence of important safety information on service literature. subject : x-radiation 1. be sure procedures and instructions to all service person- nel cover the subject of x-radiation. the only potential source of x-rays in current t.v. receivers is the picture tube. however, this tube does not emit x-rays when the high volt- age is at the factory specified level. the proper value is given in the applicable schematic. operation at higher volt- ages may cause a failure of the picture tube or high voltage supply and under certain circumstances, amy produce radia- tion in excess of desirable levels. 2. only factory specified c.r.t anode connectors must be used. degaussing shields also serve as x-ray shield in color sets. always re-install them. 3. it is essential that service personnel have available an accu- rate and reliable high voltage meter. the calibration of the meter should be checked periodically against a reference standard. such as the one available at your distributor. 4. when the high voltage circuitry is operating properly there is no possibility of an x-radiation problem. every time a color chassis is serviced, the brightness should be run up and down while monitoring the high voltage with a meter to be certain that the high voltage does not exceed the specified value and that it is regulating correctly. we suggest that you and your service organization review test procedures so that voltage regulation is always checked as a standard servicing procedure, and that the high voltage reading be recorded on each customer?s invoice. 5. when troubleshooting and making test measurements in a product with a problem of excessive high voltage, avoid being unnecessarily close to the picture tube and the high voltage supply. do not operate the product longer than is necessary to locate the cause of excessive voltage. 6. refer to hv, b+ and shutdown adjustment procedures described in the appropriate schematic and diagrams (where used). subject : implosion 1. all direct viewed picture tubes are equipped with an integra implosion protection system. but care should be taken to avoid damage during installation. avoid scratching the tube. of scratched replace it. 2. use only recommended factory replacement tubes. subject : tips on proper installation 1. never install any product in a closed-in recess, cubbyhole or closely fitting shelf space, over or close to heat duct, or in the path of heated air flow. 2. avoid conditions of high humidity such as: outdoor patio installations where dew is a factor, near steam radiators where steam leakage is a factor, etc. 3. avoid placement where draperies may obstruct rear venting. the customer should also avoid the use of decorative scarves or other coverings which might obstruct ventila- tion. 4. wall and shelf mounted installations using a commercial mounting kit, must follow the factory approved mounting instructions. a product mounted to a shelf or platform must retain its original feet (or the equivalent thickness in spac- ers)to provide adequate air flow across the bottom, bolts or screws used for fasteners must not touch any parts or wiring. perform leakage test on customized installations. 5. caution customers against the mounting of a product on sloping shelf or a tilted position, unless the product is properly secured. 6. a product on a roll-about cart should be stable on its mount- ing to the cart. caution the customer on the hazards of try- ing to roll a cart with small casters across thresholds or deep pile carpets. 7. caution customers against the use of a cart or stand which has not been listed by underwriters laboratories. inc. for use with their specific model of television receiver or generically approved for use with t.v.s of the same or larger screen size. 8. caution customers against the use of extension cords, explain that a forest of extensions sprouting from a single outlet can lead to disastrous consequences to home and family. 10watt good earth ground such as the water pipe, conduit, etc. 1500 ohm a.c. voltmeter place this probe on each exposed metal part 0.15 uf 3 product safety servicing guidelines for color television receivers caution : do not attempt to modify this product in any way. unau- thorized modifications will not only void the warranty, but may lead to your being liable for any resulting property damage or user injury. service work should be performed only after you are thoroughly familiar with all of the following safety checks and servicing guide- lines. to do otherwise, increases the risk of potential hazards and injury to the user. safety checks after the original service problem has been corrected, a check should be made of the following: subject : fire & shock hazard 1. be sure that all components are positioned in such a way as to avoid possibility of adjacent component shorts. this is especially important on those chassis which are transported to and from the repair shop. 2. never release a repair unless all protective devices such as insula- tors, barriers, covers, shields, strain reliefs, and other hardware have been reinstalled per original design. 3. soldering must be inspected to discover possible cold solder joints, frayed leads, damaged insulation (including a.c. cord), solder splashes or sharp solder points. be certain to remove all loose for- eign particals. 4. check for physical evidence of damage or deterioration to parts and components, and replace if necessary follow original layout, lead length and dress. 5. no leads or components should touch a receiving tube or a resistor rated at 1 watt or more. lead tension around protruding metal sur- faces must be avoided. 6. all critical components such as fuses, flameproof resistors, capaci- tors, etc. must be replaced with exact factory types. do not use replacement components other than those specified or make unrecommended circuit modifications. 7. after re-assembly of the set always perform an a.c. leakage test on all exposed metallic parts of the cabinet, (the channel selector knob, antenna terminals, handle and screws) to be sure the set is safe to operate without danger of electrical shock. do not use a line isolation transformer during this test. use an a.c. voltmeter, having 5000 ohms per volt or more sensitivity, in the following manner : connect a 1500 ohm 10 watt resistor, paralleled by a 15 mfd. 150v a.c. type capacitor between a known good earth ground (9water pipe, conduit, etc.) and the exposed metallic parts, one at a time. measure the a.c. voltage across the combination of 1500 ohm resistor and 0.15 mfd capacitor. reverse the a.c. plug and repeat a.c. voltage measurements for each exposed metallic part. voltage measured must not exceed 0.75 volts r.m.s. this corresponds to 0.5 milliamp a.c. any value exceeding this limit constitutes a potential shock hazard and must be corrected imme- diately. graphic symbols : the lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the service personnel to the presence of uninsu- lated ?dangerous voltage? that may be of suffi- cienty magnitude to constitute a risk of electric shock. the exclamation point within an equilateral tri- angle is intended to alert the service personnel to the presence of important safety information in service literature. fuse symbol is printed on pcb adjacent to the fuse, with ?risk of fire replace fuse as marked?. the symbol is explained in the ser- vice manual with the following wording or equiv- alent. ?caution : for continued protection against fire hazard, replace only with same type (4a, 125v)? and ? attention : afin d?assu une protection permanente contre les risques d?incendie, remplacer unique- ment par un fusible de meme type et de ?4a, 125v?. subject : x-radiation 1. be sure procedures and instructions to all service personnel cover the subject of x-rays in current t.v. receivers is the picture tube. however, this tube does not emit x-rays when the high voltage is at the factory specified level. the proper value is given in the appli- cable schematic. operation at higher voltages may cause a failure of the picture tube or high voltage supply and, under certain cir- cumstances, may produce radiation in excess of desirable levels. 2. only factory specified c.r.t. anode connectors must be used. degaussing shields also serve as x-ray shield in color sets. always re-install them. 3. it is essential that the serviceman has available an accurate and reliable high voltage meter. the calibration of the meter should be checked perio - dically against a reference standard. such as the one available at your distributor. 4. when the high voltage circuitry is operating properly there is no possibility of an x-radiation problem. every time a color chassis is serviced, the brightness should be run up and down while monitor- ing the high voltage with a meter to be certain that the high voltage does not exceed the specified value and that it is regulating cor- rectly. we suggest that you and your service organization review test procedures so that voltage regulation is always checked as a standard servicing procedure. and that the high voltage reading be recorded on each customer?s invoice. 5. when troubleshooting and making test measurements in a receiver with a problem of excessive high voltage, avoid being unnecessarily close to the picture tub eand the high voltage compartment. do not operate the chassis longer than is necessary to locate the cause of excessive voltage. 6. refer to hv, b+and shutdown adjustment procedures described in the appropriate schematic and diagrams(where used). 10watt good earth ground, such as the water pipe, conduit, etc. 1500 ohm a.c. voltmeter place this probe on each exposed metal part. 0.15 uf 4 subject : implosion 1. all direct viewed picture tubes are equipped with an integral implo- sion protection system, but care should be taken to avoid damage during installation. avoid scratching the tube. if scratched, replace it. 2. use only recommended factory replacement tubes. subject : tips on proper installation 1. never install any receiver in closed-in recess, cubbyhole or closely fitting shelf space over, or close to heat duct, or in the path of heated air flow. 2. avoid conditions of high humidity such as : outdoor patio installa- tions where dew is a factor. near steam radiators where steam leakage is a factor, etc. 3. avoid placement where draperies may obstruct rear venting. the customer should also avoid the use of decorative scarves or other coverings which might obstruct ventilation. 4. wall and shelf mounted installations using a commercial mounting kit, must follow the factory approved mounting instructions. a receiver mounted to a shelf or platform must retain its original feet(or the equivalent thickness in spacers) to provide adequate are flow across the bottom, bolts or screws used for fasteners must not touch and parts or wiring. perform leakage test on cus- tomized installations. 5. caution customers against the mounting of a receiver on sloping shelf or a tilted position, unless the receiver is properly secured. 6. a receiver on a roll-about cart should be stable on its mounting to the cart. caution the customer on the hazards of trying to roll a cart with small casters across thresholds or deep pile carpets. 7. caution customers against the use of a cart or stand which has not been listed by underwriters laboratories, inc. for use with their specific model of television receiver or generically approved for use with t.v.?s of the same or larger screen size. model items dtq-20v1/v4fsp g dtq-20v1/v3/v4/u1ssp g dtq-15u5ssp g dtq-14v1/v4/v5fsp g dtq-14v1/v4/v5/u1ssp g dtq-14v6nbp g /npp g dtq-14v1/v4 / v 8/ u1 ssf g dtq- 20 v1/v4/v8/u1ssfg dtq-14v4/20v4fcf g remarks tv standard ntsc-m power input ac 120v 60 hz ac 220v 50/60 hz ac90-250v(fcfm series) power consumption 14 = 55w 20 = 6 5 w tuning system frequency synthesizer ( fs ) tuning system tuning ranges vhf : 2 ~ 13 (12) uhf : 14 ~ 69 (56) catv : 1 ~ 125 (125) sound output 1.3 w (14/20u1 series/20v8 series 1.3w + 1.3w) speaker 3 w 8 ohm antenna input impedance 75 ohm unbalanced auxiliary input terminal front : video, audio rear : video, audio "p" series without video, audio intermediate frequencies picture if carrier frequency : 45.75 mhz sound if carrier frequency : 41.25 mhz color sub-carrier frequency : 3.579545 mhz remote control r-43a08 special functions 3-language osd with caption wake-up on/off time sleep timer power restore dtq-14p2/p3fc g dtq-14p2/v1fcw g /p2sc g dtq-14v1/v5fc g /v1/v4sc g dtq-14v5fcn g /15u5sc g dtq-14v6fcb g /fcp g /fbb g /fpp g DTQ-14J4fcg g /fcc g dtq-20v1/v4/v5fc g dtq-20v1/v4sc g dtq-20p2/p3fc g /p2sc g dtq-14v6nb g /np g dtq-14v1/v3/v5fs g dtq-14v1/v3/v4/v5/v8/v9ss g dtq-14u1fs g /ss g /20u1fs g /ss g dtq-20p2ss g /15u5fs g / ss g / 15 u 7 ss g dtq-20v1/v3/v4fs g dtq-20v1/v3/v4/ v 5 / v8/v9ssg specifications 5 b lock d ia gr am 6 7 alignment instructions 1. service mode adjustments follow the steps below whenever service adjustment is required. see table- a and table- b to determine if service adjustments are required. 1) how to enter the service mode using the user remote control. turn the set on. direct the remote control to the reception window of tv. push buttons of remote control in sequence as follows. 1 ? mute ? displ ay ? mute then, the screen will appear as follows. using the channel up or channel down button, select the item you wish to adjust. (the color of selected item turns into the red.) press the volume up or down button to enter in the service mode you wish to adjust. 2) how to memorize the adjusted values in the service mode. must press displ ay button the state which the screen is displaying each of service menus after all adjustments are completed each of all service menu. table-a : adjust the values of service mode when a part is replaced. part replaced adjustment notes necessary unnecessary i701 (u-com) o data is stored in i703. i101 (main) o i703 (eeprom) o initial setting values are written from i701. adjusting items crt o adjust items related to picture tube only.(white balance adjustment) s2 scrn s5 ifc s6 geo s8 w/b s9 dp s12 fact s5 rfagcd s6 h. sh if t /v. sh if t /v.size s8 rd/bd/rb/gb/bb s9 b rightness 8 alignment instructions table-b * indicates the items with different settings each of sets s2 align rf agc threshold select agc reference voltage 22 10 automatically turn off in 15min for no received signal 0 0 0,1 0,1 1 0 0,1 0,1 0 0 0,1 0,1 0 0 0,1 0~3 0 0 0~3 0~3 3 0 0~3 0,1 0 0 0,1 0,1 0 1 0,1 0,1 on 15 on,off 0~30 align red out ac level align blue out ac level align red out dc level align green out dc level align blue out dc level align common rgb dc level 1 0 0,1 0,1 0 1 0,1 0,1 0 1 0,1 0,1 0 1 0,1 0,1 0 0,1 0 0,1 0 0,1 s12 factory initialization data initial range auto hvco auto rfagc mode adjustment items ok ok, ng ext screen adjustment h vco adj rf-delay agc point vco ch no agc ch no auto vco - - ok 0~63 33 04 0~7 90 0~125 ok ok, ng 0~15 02 0~7 3.75 3.25/3.5/3.75/4.0 - remarks vif f c clip level trap off no no,yes no no,yes 38 0~63 black stretch discharge black stretch charge forwarding mode killer level take off abcl gain aft defeat hvblk off sharpness video tsharp abcl blackstre.off sslicedown2 sslicedown1 osd level 0 0,1 tint color 1 0,1 0 0,1 0 0,1 4 0~7 0 0,1 0 0,1 1 0,1 0 0,1 4 0~7 64 0~127 64 0~127 brightness contrast 128 0~255 128 0~255 128 0~255 00 0~255 127 0~255 00 0~255 63 0~127 63 0~127 140 0~255 70 0~155 12 0~27 42 0~77 15 0~27 38 0~43 scr b-bias scr r-drive scr b-drive scr bright gb(green bias) bb(blue bias) scr r-bias scr g-bias vif video out gain rd(red drive) bd(blue drive) rb(red bias) 2 0~3 afc1 gain afc2 gain analog osd us/ja sw sync det auto slice down fbl vth l bgpfbp off 0 0~3 ok, ng vblk shift vblk shift on no sd power off h.shift(horizental shift) v.shift(vertical shift) v.size(vertical size) 03 0~7 09 s7(2) service sw v mute htone sw white back v free gamma control trap fine ad h free window fm level s5 s6 s7(1) y sw lpf y dl fine y dl time vout stop fsc free vif vco adj s8(1) s8(2) s9 s11 9 2) focus adjustment ? turn in a local station and adjust the focus control knob (located on fbt) for best picture details at high light condition. 3) rf agc delay adjustment (s5) ? receive a good local channel. ? enter the service mode and select service adjustment s5. ? you can see the osd as shown in below. ? select rfagcd item, press the volume up or down button until noise or beat in picture disappears. ? press the display button to memorize the data. 2. assembly adjustments 1) screen adjustment (s2) ? enter the service mode and select service adjustment s2. ? you cna see the one horizontal line on the screen. ? adjust the screen control volume (located on fbt) so that the horizontal line onscreen may be disappeared. ? press the volume up or down button to exit in the screen adjustment mode. in the screen adjustment mode, dont press other buttons except volume up or down button. note alignment instructions if control auto vco ok vif vco adj 33 auto hvco ok hvco adj 04 auto rfagc start rf-delay 90 agc point 3.75 vco ch no 22 agc ch no 10 4-3. vertical size adjustment ? select v. si ze ite m , adjust v. s iz e data value to proper vertical size as follows. ? you can see the osd as shown in below. 4-1. horizontal shift a djustment ? select h. s h if t item, adjust h. shift data value to obtain proper horizontal centering of the internal cross pattern at the left and right of the screen. 4-2. vertical sh if t adjustment ? select v. shift item, adjust v. shift data value to center the raster properly on thescreen. geometry h. shift 09 v. shift 02 v. size 38 vblk shift 0 3 vblk shift on no no sd power off no move adjust recall:set 10 alignment instructions 4) geometric adjustments (s6) ? enter the service mode and select service adjustment s 6 . 11 alignment instructions select subbrightness item, adjust subbrightness data value to obtain normal brightness level. press the display button to memorize the data. contrast fixed value = 12 tint fixed value = 42 color fixed value = 15 sharpness fixed value = 38 7) factory outgoing mode (s12 : fact) if you select the s12, then the set becomes factory outgoing status. you can see the osd outgoing ok 6) digital preset(d.p) adjustments(s9) subbrightness adjustment receive a good local channel. enter the service mode and select service adjustment s9. you can see the osd as shoown in below. d.p. brightness 64 contrast 12 tint 42 color 15 sharpness 38 move adjust recall : set 5) white balance adjustment(s8) receive a good local channel. enter the service mode and select service adjustment s8. you can see the osd as shown in below. using volume up or volume down, adjust service adjustment data of rd/gd/bd and rb/gb/bb until a good gray scale with normal whites is obtained.alignment instructions press the display button to memorize the data. rd 64 bd 64 rb 128 gb 128 bb 128 move adjust recall : set 12 3. parental control password settings if user forget parental control password as follows. 1) change the password. ? turn the set on. ? direct the remote control to the reception window of your tv/vcr ? using the menu buttons, select the special menu. ? using the the channel up ( ) or down ( ) duttons, select prental control. ? using the volume up ( ) , set the password menu. ? push buttons of remote control in sequence as follows. 2 2 1 1 ? parental control password is reset. ? using the 0~9 buttons, enter the password. ? using the 0~9 buttons, repeat the password. 2) reset the password ? turn the set on. ? direct the remote control to the reception window of your tv/vcr. ? push buttons of remote control in sequence as follows. 1 mute dis pl a y mute ? then, the screen will appear as follows. ? using the channel up ( ) or down ( ) buttons, select s12 fact. press the volume up ( ) button, the set becomes factory outgoing status. ? parental control password is reset. ? using the menu buttons, select the parental control menu, set the new password. alignment instructions s2 scrn s5 ifc s6 geo s8 w/b s9 dp s12 fact closed caption : off cc on mute : off power restore : off parental control special select a d ju st n exit enter the password # # # # parental control [0 - 9] : adjust n p re v . enter a new password parental control [0 - 9] : adjust n p re v . repeat the password # # # # parental control [0 - 9] : adjust n exit voltage chart 13 0 / 0 / 0 / 0 / 0 ' ' 0 ' ' 0 ' ' 0 ' ' 0 / 0 / 0 / 0 / 0 ' ' 0 ' ' 0 ' ' 0 ' ' 0 / 0 / 0 / 0 / 0 ' ' 0 ' ' 0 ' ' 0 ' ' 0 / 0 / 0 / 0 / 0 ' ' 0 ' ' 0 ' ' 0 ' ' 0 / 0 / 0 / 0 / 0 ' ' 0 ' ' 0 ' ' 0 ' ' - $ - $ - $ - $ 1 * / 1 * / 1 * / 1 * / - $ - $ - $ - $ 1 * / 1 * / 1 * / 1 * / 1 * / 1 * / 1 * / 1 * / . 0 % & . 0 % & |