AT&TメーカーTL74458の使用説明書/サービス説明書
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User's manual TL74108/TL74208/TL74308/ TL74408/TL74258/TL74358/ TL74458 5.8 GHz cor ded/cor dless tel ephone/answering syst em with caller ID/call waiting.
Model # : TL74108 (single handset)/TL74208 (two handsets)/ TL74308 (three handsets)/TL74408 (four handsets)/ TL74258 (two handsets)/TL74358 (three handsets)/ TL74458 (four handsets) Type: 5.
T elephone base Belt clip for cordless handset (1 for TL74108) (2 for TL74208/TL74258) (3 for TL74308/TL74358) (4 for TL74408/TL74458) Power adapter for telephone base Power adapter for handset charge.
Getting s tarted Quick ref erence guide handset .............................................. 1 Quick ref erence guide telephone base .............................. 2 Installation prepar ation ................... 3 Additional handsets ...............
Appendix G Important safety inf ormation ..... 71 Appendix H FCC part 68 & A CTA ....................... 74 Appendix I FCC part 15 ......................................... 76 Appendix J Limited warranty .............................. 77 Appendix K T echnical specifications .
1 Getting st arted Quick r ef er enc e guide - handset CID Press to display the call er ID information (page 46). DIR Pr ess to dis pla y t he di r ec tor y (page 39). PH ONE /FL ASH Pr ess to mak e or answ er a ca ll. Duri ng a ca ll, pr ess t o re cei ve an inc omin g c all if c all wa itin g i s ac tiv at ed (page 18).
Getting st arted Quick r ef er enc e guide - t elephone base 2 IN USE On when handset is in use, when the answering system is answering an incoming call or you are registering a handset. Flashes when another telephone is in use on the same line, or you are deregistering a handset from the telephone base.
3 S T O P ! Se e p age 8 for easy instructions. Y ou mu st in sta ll and c har ge th e h and se t b att er y bef or e us ing th e cor dl ess ha nd set . Avoid placing the t elephone base t oo close to: • Communication devices such as: television sets, VCRs, or other cordless t el ep ho ne s.
4 Getting st arted Additional handsets (optional) Ad d ne w ha ndse ts t o ma k e y ou r t ele phon e m or e v er sa til e ( se e pa ge 6 8) Y ou r t el epho ne ca n ac com moda te up t o f our c or dl ess hand set s.
5 2. Press the tab on the base battery cover (on the bottom of the telephone base) toward the cover and swing open the battery door. 3. Insert three new AAA alkaline batteries, matching the + and - signs engraved on the telephone base.
6 IM POR T AN T I NF OR MA T IO N 1. Use o nl y t he po we r adap ter s s uppl ied w ith t hi s pr od uc t or e qui va len t. T o order a replacement power adapter , visit our website at www .telephones.at t.com , or call 1 (800) 222-3111 . In Canada, dial 1 (866) 288-4268 .
7 1. Plug the small end of the handset charger power adapter into the jack on the underside of the charger , then route the cor d through the slot as shown. 2. Plug the handset charger power adapter into a power outlet not controlled b y a wall switch.
Getting st arted Handset bat t ery inst allation & char ging Install the batt ery as shown below . After installing the battery , you can make and receive short calls, but replace the handset in the charger when the handset is not being used. For optimal performance, charge the handset battery for at least 16 hours befor e use.
Getting st arted Install ation options The telephone base comes with the mounting bracket already installed for desktop use. If wall mounting is desired, a telephone outlet wall mounting plate with mounting studs is required.
Getting st arted Install ation options 10 4. Remove the telephone handset tab, r otate and replace it t o hold the corded handset secur ely in place when telephone base is mounted on the wall. 2. Co nn e c t th e te le ph on e li ne c or d an d po we r ad ap t er t o th e j ac ks o n th e bo t t om o f th e t el e p ho ne b as e.
11 Getting st arted Install ation options W all mount to desktop inst all ation T o change the telephone base from the wall mount position to deskt op position.
12 Getting st arted Install ation options 4. Remove the telephone handset tab, r otate and replace for deskt op use. 3. Co nn ec t t he te le ph o ne li n e c or d a nd po w er ad a p t er t o th e ja.
13 Getting st arted Belt clip & optional headset T o a t t a c h th e be l t cl ip : Snap the belt clip into the retaining tabs on both sides of the handset as shown in the figure. T o r e m o v e t h e b e l t c l i p : Gently lift either of the belt clip retaining t abs, shown in the figure, outwards to r emove the belt clip from the handset.
T elephone oper ation 14 Basic oper ation Making a call Using a cordless handset: • Press PHONE /FLASH or SPEAKER , then enter the telephone number. To end a call: • Press OFF /CLEAR or return the handset to the charger. The screen displays the elapsed time as you talk (in hours, minutes and seconds).
T elephone oper ation 15 Basic oper ation Clearspeak TM dial-in-base speak erphone Du rin g a cal l y ou c an pr ess SPE AK ER on th e t el ep ho ne ba se t o al te rn at e bet we en ha nds -f r ee sp eak er pho ne a nd nor ma l han dse t us e. Pr ess SP EAK ER o n t he te lep hon e ba se to ha ng up.
T elephone oper ation 16 Basic oper ation Las t number r edial T o view the five most recently dialed numbers: Using a cor dless handset: • Press REDIAL /P AUSE to display the most recentl y called number (up to 30 digits). • Press , or REDIAL /P AUSE repeatedly t o view up to five r ecently called number s.
Basic oper ation Handset locat or Th e ha nd se t lo ca to r f ea tu r e is u se fu l i f yo u mi sp la ce a ha nd se t. T o s t a rt t he p ag in g to ne : • Pr es s HA ND SE T L O CA T OR /I NT ER C OM o n th e t el ep ho ne b a s e.
18 T elephone oper ation Options while on calls V olume contr ol P r es s t he V OL UM E k ey s o n th e si de o f th e ha nd se t or o n th e t el ep ho ne b as e to a dj u st li st en in g v o l um e. E ac h pr es s of t he b ut to n in c r ea se s or d ec re as es t he v ol um e.
T elephone oper ation 19 Options while on calls Mute The mute function allows you to silence the microphone. You can hear the caller, but the caller will not be able to hear you. To mute the call on a cor dless handset: • Press MUTE/ REMOVE to silence the microphone.
T elephone oper ation 20 Chain dialing This featur e allows you to initiat e a dialing sequence from number s stored in the dir ectory, caller ID history or r edial list while you ar e on a call.
21 Int er com Usi ng a c or dles s han dse t: Use th e i nter com fe at ur e f or c onv ersa tio n bet wee n h andse ts or th e t elep hon e b ase . 1. Pr es s IN T . T he s cr ee n wi ll s ho w IN TE R C O M T O: 2. En te r a ha nd se t nu mb er . T h e s cr ee n wi ll s ho w CA LL IN G HA ND SE T X .
T elephone oper ation Int er com Usi ng the tel epho ne bas e: Y ou c an in iti at e a n int erc om cal l at the t el eph one bas e w ith any sy st em han dset. 1. Pr ess HA NDS ET L OCA T OR / INT ER C OM on th e te le pho ne bas e. 2. En te r a ha n ds et n um be r .
T elephone oper ation Call tr ansfer using int er com Using a cor dless handset: Use the intercom feature to transfer an outside call to the telephone base or a c ordless handset in the system. 1. During a conversation with an outside call, press INT .
T elephone oper ation Call tr ansfer using int er com Using the tel ephone base: Use the intercom feature to transfer an outside call to any of the cor dless handsets in the system. 1. During a conversation with an outside call, press HANDSET L OCA TOR /INTERC OM .
25 T elephone oper ation Handset set tings Using the featur e menu, you can change settings to customiz e how the telephone works. 1. Pr ess MENU/ SELECT in idle mode (when the phone is not in use) to enter the f eature menu. 2. Use or to scroll to the f eature t o be changed.
26 RI NG ER V OL UM E > DI RE CT OR Y CA LL L OG > RI NG ER V OL UM E RI NG ER T ON E T elephone oper ation Handset set tings Ringer volume Us ing t hi s m enu , y ou ca n s et a r in g vo lu me le ve l (1 -6) , or tu rn th e rin ger o ff . Whe n th e r ing er i s tu rne d of f, th e w ill a pp ear on t he ha nds et sc re en.
27 T elephone oper ation Handset set tings K ey tone The handset is factory pr ogrammed to beep with each key pr ess. If you turn off the KEY TONE , there will be no beeps when k eys are pr essed. T o tu rn th e K EY T O NE on o r off : 1. Press MENU/ SELECT in idle mode t o enter the featur e menu.
28 T elephone oper ation Handset set tings Visual message waiting (voic email) indicator If you subscribe to a voic email service offer ed by your local tel ephone company , the voicemail waiting indicator featur e will provide visual indication when you have new voic email messages.
29 T elephone oper ation Handset set tings T emporary ring silencing Press OFF/ CLEAR or MUTE/ REM OV E while the telephone is ringing to sil ence the ringer temporaril y . This will silence the ringer without disconnecting the call. The next inc oming call will ring normally at the preset v olume.
30 T elephone oper ation T elephone base settings Using the featur e menu, you can change settings to customiz e how the telephone base works. 1. Pr ess MENU/ SELECT in idle mode (when the phone is not in use) to enter the f eature menu. 2. Use C ID or D IR to scr oll to the featur e to be changed.
31 MSG # - - T elephone oper ation R I N G E R V OL UM E < RI NG E R V O L U M E R I N G E R T ON E MSG # - - MSG # - - T elephone base settings Ringer volume Us ing t hi s m enu , y ou ca n s et a r in g vo lu me le ve l (1 -6) , or tu rn th e rin ger o ff .
32 T elephone oper ation T elephone base settings Ringer tone Th is fe atu re al lo ws y ou t o cho os e one of 1 0 rin ger t on es. T o cho os e a r ing er t on e: 1. Press MENU/ SELECT in idle mode t o enter the featur e menu. 2. Us e CI D or DI R to scroll t o the > RINGER T ONE menu, then press MENU /SELE CT .
33 T elephone base settings Language In th is m enu , y ou c an se le ct t he lan gu ag e u sed f or al l s cr een d is pla ys . T o sel ec t a la ngu age : 1. Press MENU/ SELECT in idle mode t o enter the featur e menu. 2. Use CI D or DI R to scroll to the > LANGUA GE menu, then press MENU /SELECT .
Dir ectory Dir ect ory Shar ed dir ectory The directory is st ored in the telephone base, and is shared by all handsets and the t elephone base. Changes made to the dir ectory on any one handset or telephone base will apply t o all.
Dir ectory New dir ect ory entries T o creat e and stor e a new dir ectory entry Us ing a c or dl es s h an ds et: 1. Press MENU/ SELECT in idle mode t o enter the featur e menu 2. Press MENU /SELECT again t o enter the > DIRECT ORY menu. 3. Pr ess on a handset to highlight S T ORE.
New dir ect ory entries 7. Enter the name when prompt ed. • Use th e dia l pad to ente r a na me (u p to 15 char act ers) . Each time a k ey is pr essed, the char acter on that k ey wi ll be displa yed. Ad dition al k ey pre sses w ill p rod uce other ch arac ter s on that k ey .
37 New dir ect ory entries T o creat e and stor e a new dir ectory entry Us ing t he t el ep ho ne ba se: 1. Press MENU/ SELECT in idle mode t o enter the featur e menu 2. Press MENU /SELECT again t o enter the > DIRECT ORY menu. 3. Pr ess CI D o r DI R to highlight S TORE.
38 New dir ect ory entries 7. Enter the name when prompt ed. • Use th e dia l pad to ente r a na me (u p to 15 char act ers) . Each time a k ey is pr essed, the char acter on that k ey wi ll be displa yed. Ad dition al k ey pre sses w ill p rod uce other ch arac ter s on that k ey .
39 Dir ectory An dr ew 555-6789 Ba rb ar a 555-9876 Dir ect ory r eview T o review dir ectory entries Using a cor dless handset: 1. Pr ess DIR in idle mode to display the fir st listing in the direct ory. DIRECT ORY EMPTY will be displayed if ther e are no dir ectory entries.
Dir ectory 40 Dir ect ory sear ch T o search by name Follow the steps below to search for direct ory entries on a handset or the telephone base. 1. Pr ess DIR in idle mode to display the fir st listing in the directory . DIRECT ORY EMPTY will be displayed if ther e are no dir ectory entries.
Dir ectory 41 T o dial, delete or edit entries T o dial, delete or edit a directory entry (name and number), the entry must be displayed on the handset. Use directory sear ch or review (pages 39-40) to display an entry . Display dial T o dial a displayed number from the direct ory, • Press PHONE /FLASH or SPEAKER on a cordl ess handset.
42 Dir ectory T o dial, delete or edit entries 2. Pr es s MEN U / S EL E C T . Y ou wi ll be pr om pt ed t o Y o u wi ll b e pr o m p t ed t o ED IT N AM E. • Pr e ss t he d ia l pa d k ey s t o a dd c ha ra ct er s ( pa ge 3 6) . • Pr e ss M UTE /R E MO V E t o e r as e ch ar ac t er s .
43 Caller ID operation Caller ID oper ation Informa tion about caller ID with call waiting Th is pr od uc t h as c al le r I D wi th c al l w ai t in g f ea tu r e th at wo rk s w it h y ou r l oc al te le ph on e c om pa n y se rv ic e.
44 Caller ID operation Caller ID oper ation How the caller ID his tory works The caller ID history stor es information about the last 50 incoming calls. Review the caller ID history to find out who called, t o easily return the call, or to copy the call er’s name and number into your dir ectory .
Caller ID operation 45 Caller ID oper ation Memory match If the incoming telephone number e xactly matches a telephone number in y our direct ory , the name that appears on the screen will mat ch the corresponding name in y our directory .
Caller ID hist ory To review caller ID his tory Using a cor dless handset: 1. Press CID to review the caller ID hist ory . The caller ID history displays the caller ID entries in reverse chronological order starting with the most recent call.
47 Caller ID hist ory To dial from caller ID his tory Using a cor dless handset: While reviewing an entry in the caller ID history: • Press PHONE/ FLASH or SPEAKER to call the number as it is displayed in the caller ID history .
Caller ID operation NOTE : If both the name and number are not provided, UNABLE TO SA VE will be displayed. 48 Caller ID hist ory Other options • Press MUTE /REMOVE on a cordless handset or press X DELETE on the tel ephone base to delete the displayed entry from the caller ID history.
49 Answering system oper ation A bo u t th e an s w er in g s y s t e m Answering sys tem and voic email Y our telephone has both a digital answering system and voic email indication. V oicemail is offered b y your telephone servic e provider (fees may apply).
Answering system oper ation 50 A bo u t th e an s w er in g s y s t e m The answering system can r ecor d up to 99 messages, depending on the length of each message. Individual messages can be up to four minutes long, and the tot al maximum r ecording time is 14 minutes.
51 Day & time announcement T o check day & time Y ou can press CL OCK when the system is idle t o hear the current day and time. If you subscribe to Caller ID servic e from your local telephone c ompany , the time will automatically be set with every inc oming call.
52 Answering syst em mode Unless you change it, the answering system will be on and ready to record messages. You can turn the answering system off, but if you do so, the answering system will not answer calls and record incoming messages. T o turn the answering system on or off: • Press ANSWER ON to turn off your answering system.
Answering system oper ation 53 Out going announcements Outgoing announcements ar e the messages callers hear when calls ar e answered by the answering system. The telephone has a pr erecor ded outgoing announcement: “ Hello. Please lea ve a message after the t one.
Out going announcements T o delete your out going announcement 1. Pr ess ANNC. Y ou will hear “ Announcement. Press PLA Y or press REC ORD ." 2. Press PLA Y /S TOP t o begin playback. 3. Pr ess DELETE during playback to delete your announcement, "Announcement del eted.
55 NOTE: To adjust the voice prompt volume, press VOLUME . Answering syst em setup You can change the number of rings, call screening status, remote access code and message alert tone. To change the answering system setup: 1. Press SETUP repeatedly to hear the settings for different features.
Answering syst em setup Number of rings Y ou can set the answering system to answer an incoming call aft er two, four , or six rings. Y ou can also select toll sav er , which is explained below . Unless you change it, the answering system answers an inc oming call after f our rings.
57 Answering syst em setup Call scr eening You can turn the call screening feat ure on or off . Unless you change it, the call screening feature is set to on.
Answering syst em setup Message alert tone When the message alert tone is set to On , and there is at least one new message, the telephone base will beep every 10 seconds. Unless you change it, the message alert tone is set to off. To change the setting: 1.
Message playback Press PLAY /STOP to hear messages. The system announces the number of messages, then begins playback. If you have new messages, you will hear only the new messages (oldest first). If there are no new messages, the system will play back all messages (oldest first).
R ecor ding & playing memos Memos are messages you r ecord yourself . They are saved, pla yed back and deleted exactly lik e in co mi ng m es sa ge s. Y ou c an r ec or d a m em o as a reminder to your self, or lea ve a message for so me on e el se w ho u se s th e an sw er in g sy st em .
Message count er displays Th e me ss ag e co un te r u su al ly d is pl ay s th e t ot al nu mb er o f an sw er in g sy st em m e ss ag es . Se e th e t a b l e b el ow f or ot he r me ss ag e co un t er d is pl a ys . Message count er displays 0 No messages.
R emote ac cess You can access your answering system remotely by dialing your home telephone number from any touch-tone telephone. To remotely access your answering system: 1.
R emote ac cess * 7 Press to r ecord a new announcement. 0 Press to t urn the answering system on or off . 8 Press to end r emote acc ess (the call will be terminated).
Appendix A Scr een icons & al ert t ones One beep every 10 seconds Message alert. Scr een icons & al er t tones Ringer off. Handset battery char ging (animated display). Low batt ery (flashing); place handset in charger t o recharge. Microphone is muted.
65 Indicator lights ANSWER ON On when answer ing sy stem is on and r eady t o receiv e call s. V OIC EM AIL Fl ash es w hen y ou ha ve n ew vo ic em ai l. V oic em ai l is a ser vi ce of fe r ed by yo ur l oc al te lep hon e c om pan y , and i s dif fe r ent fr om an swe ri ng sy st em mes sag es .
66 Appendix C T elephone base and handset display scr een messages PHONE The handset is in use. DIRECTORY EMPTY You ar e accessing an empty direct ory. MUTED The microphone is muted. LOW BATTERY The handset batt ery needs to be recharged. INCOMING CALL There is a call coming in.
67 Appendix C T elephone base and handset display scr een messages Scr een display messages Failed int ercom or conf erence call (there are alr eady two handsets being used). UNABLE TO CALL TRY AGAIN Another system tel ephone is already using the direct ory or call log.
68 Appendix D Adding and r egist ering handsets Your telephone can accommodate up to four cordless handsets. You can add new handsets (TL77008, sold separately) to the TL74108/TL74208/TL74308/ TL74408/TL74258/TL74358/TL74458 at any time, but each new handset must be registered with the telephone base before use.
69 Appendix E R eplacing a handset Y ou may need to de-r egister your handsets if: Y ou have four regist ered handsets and need t o replace a handset. -OR- Y ou wish to change the designated handset number of your regist ered handsets. Y ou must first de-register ALL the handsets, and then r e-register each handset you wish to use.
70 Appendix F Ma in te nan c e T aking care of your t elephone Y our cordless tel ephone contains sophisticated el ectronic parts, so it must be treated with car e. Avoid r ough treatment. Place the handset down gently . Save the original packing materials to protect y our telephone if you ev er need to ship it.
71 Appendix G Important saf ety inf ormation This symbol is to alert y ou to important operating or servicing instructions that may appear in this user’s manual. Always f ollow basic safety precautions when using this pr oduct to reduc e the risk of injury , fire, or electric shock.
72 Appendix G Important saf ety inf ormation Especially about c or dless t elephones Privacy: The same featur es that make a cordless t elephone convenient create some limit ations.
73 Appendix G Important saf ety inf ormation Pr ecautions for users of implant ed cardiac pac emakers Cardiac pacemak ers (applies only to digital cor dless telephones): Wir eless T echnology Research.
74 Appendix H F CC P art 68 and A CT A T hi s eq u i pm e n t c om p li e s w i t h P ar t 6 8 of t he F C C r ul e s a n d w i th t ec h ni c a l r e q ui r em e nt s a d o pt e d b y t he A dm i n is t r a t iv e Co u nc i l f o r T e rm i na l A t t a ch m e nt s ( A C T A ) .
Appendix H F CC P art 68 and A CT A I f t h is p r o du c t h a s m e mo r y d i a li n g l o ca t i on s , y o u m a y ch o o se t o s t o r e e m e r g en c y t el e ph o ne n um b e rs (e . g ., p ol i ce , f i r e , m e d ic a l ) i n t h es e lo c at i o ns .
76 Appendix I F CC P art 15 This equipment has been tested and f ound to comply with the r equirements for a Class B digital device under P art 15 of the Federal Communications Commission (FC C) rules. These requir ements are int ended to provide reasonable pr otection against harmful interferenc e in a residential inst allation.
Appendix J Limit ed warr anty Th e A T& T b r an d is u se d un de r li ce ns e - an y r ep ai r , re pl ac em e nt o r wa r r an ty se rv ic e, a nd a ll q ue st io ns a bo ut t hi s pr od uc t sh ou ld b e di r e ct e d t o: I n th e Un it ed St at e s of A me ri ca , vi si t ww w .
Appendix J Limit ed warr anty Wh at i s no t co ve r ed b y th i s l im it ed w a rr a nt y? T hi s li m i t ed w ar ra nt y d oe s no t c o ve r : PR OD UC T th at h as b ee n su bj ec t ed t o mi su.
Appendix J Limit ed warr anty W h a t m us t y ou r e tu rn w i t h t h e P R OD U C T t o ge t wa rr an ty s er v i c e? Y ou m u s t : Return the entir e original package and cont ents including the.
Channels 95 Operating temperat ure 32°F — 122°F 0°C — 50°C T elephone base voltage (AC voltage, 60Hz) 96 — 130 Vrms T elephone base voltage (AC adapter output) 9VDC @600mA Handset voltage 3.2 — 4.7 VDC 550mAh Charger volt age (AC adapter output) 9VDC @200mA Replacement handset battery 3.
81 Appendix L T r oubleshooting If you have diffi cul ty with you r tel ephon e, ple ase try the sug ges tio ns be low . For Cus to mer Serv ic e, visi t our websi te at ww w .t el ep hon es.a t t.c om , or call 1 (800 ) 222 –311 1 . In Can ada dial 1 (8 66) 288- 4268 .
82 Appendix L T r oubleshooting My cordl ess handset isn’t performing normally • Make sure the power cor d is securely plugged into the telephone base. Plug the unit into a diff erent, working electrical outlet not contr olled by a wall swit ch. • Move the cordless handset closer t o the telephone base.
83 Appendix L T r oubleshooting C ONNECTING... displays on my cordl ess handset The batteries will not hold a charge • If the cordless handset is in the char ger and the charge light does not come on, re fer to The char ge light is off in this T roubl eshooting guide.
84 Appendix L T r oubleshooting • Y ou may be able to improve the perf ormance of your cordl ess phone by installing your new tel ephone base as far as possible fr om any other existing cor dless telephone syst em that may alr eady be installed. • Other electronic pr oducts can cause interfer ence to your cor dless phone.
85 Appendix L T r oubleshooting • Charge the batt ery in the cordl ess handset for at least 16 hours. For optimum dail y performance, r eturn the cordl ess handset to its base when not in use. • Y ou may have too many ext ension phones on your telephone line t o allow all of them to ring simultaneously .
86 The charge light is off • Make sure the power and line cor ds are plugged in correctl y and securely . • Unplug the unit’s electrical power. W ait for 15 seconds, then plug it back in. Allow up to one minute f or the cordl ess handset and telephone base to r eset.
87 Appendix L T r oubleshooting S ys t em do es no t r ec ei ve ca ll er I D wh en on a c al l • Make sure you subscribe t o caller ID with call waiting featur es services pro vided by your local tel ephone company .
88 S y s t e m d o e s n o t r e s p o n d t o r e m o t e c o m m a n d s • Make sure to ent er your remot e access code correctl y (see pages 62-63). • Make sure you ar e calling from a t ouch-tone phone. When you dial a number , you should hear tones.
89 A AC adapter , 6, 7 Alert tones, 64 Answering calls, 15 Answering system, 49-63 Auto off , 15 B Battery char ging, 8 Battery inst allation, 8 Belt clip, 13 C Call interc ept, 52 Call screening, 52 .
90 T T echnical specifications, 80 T elephone base installation, 6 T elephone base settings, 30-33 T elephone operating range, 80 T roubleshooting, 81-88 V Voic email, 65 Voic email waiting indicator .
Fold her e. Cut along dotted line. Call your phone number , then enter your two-digit acc ess code (preset to 19 ). Action Remot e command Play all messages .................. 1 Play new messages ............... 2 Delete the message .............. 3 Delete all old messages .
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デバイスAT&T TL74458の購入後に（又は購入する前であっても）重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります：
AT&T TL74458をまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはAT&T TL74458の技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。AT&T TL74458の取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。AT&T TL74458で得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
AT&T TL74458を既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はAT&T TL74458の不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、AT&T TL74458に関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちAT&T TL74458デバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
