Instruction/ maintenance manual of the product RAV-SM1403AT-E1 Toshiba
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R410A FILE NO. A1 1-016 SER VICE MANUAL (SPLIT TYPE) OUTDOOR UNIT < DIGIT AL INVER TER> RA V -SM1103A T -E1 RA V -SM1403A T -E1 PRINTED IN JAP AN, Jan.
– 2 – CONTENTS Precaution f or Safety .......................................................................................................... .. 6 New Refrigerant (R410A) .........................................................................
– 3 – Original instruction Please read carefully through these instructions that contain impor tant inf or mation which complies with the “Machiner y” Directive (Directiv e 2006/42/EC), and ensure that you understand them.
– 4 – Definition of Pr otective Gear When the air conditioner is to be transpor ted, installed, maintained, repaired or remov ed, wear protectiv e glov es and ‘safety’ work clothing. In addition to such normal protective gear , wear the protective gear described below when under taking the special work detailed in the table below .
– 5 – W arning Indications on the Air Conditioner Unit [Confirmation of warning label on the main unit] Confir m that labels are indicated on the specified positions If removing the label during par ts replace, stic k it as the or iginal.
– 6 – Precaution f or Safety The manuf acturer shall not assume any liability f or the damage caused by not obser ving the description of this manual. D ANGER Before carrying out the installation, maintenance, repair or remov al wor k, be sure to set the circuit break er to the OFF position.
– 7 – W ARNING General The appliance shall be installed in accordance with national wiring regulations. Capacity shor tages of the power circuit or an incomplete installation ma y cause an electr ic shock or fire .
– 8 – Refrigerant The refrigerant used by this air conditioner is the R410A. Check the used refrigerant name and use tools and materials of the par ts which match with it. F or the products which use R410A refr igerant, the refrigerant name is indicated at a position on the outdoor unit where is easy to see.
– 9 – Check after repair Once the repair work has been completed, check f or refr igerant leaks, and chec k the insulation resistance and water dr ainage. Then perform a tr ial run to check that the air conditioner is r unning properly . After repair work has finished, check there is no troub le.
– 10 – Explanations given to user • If y ou hav e discovered that the f an grille is damaged, do not approach the outdoor unit but set the circuit breaker to the OFF position, and contact a qualified ser vice person to hav e the repairs done. Do not set the circuit breaker to the ON position until the repairs are completed.
– 11 – Ne w Refrig erant (R410A) This air conditioner adopts a new HFC type refrigerant (R410A) which does not deplete the ozone la yer . 1 . Safety Caution Concerned to Ne w Refrigerant The pressure of R410A is high 1.6 times of that of the f or mer refrigerant (R22).
– 12 – 4 . T ools 1. Required T ools for R410A Mixing of diff erent types of oil may cause a troub le such as generation of sludge, clogging of capillary , etc.
– 13 – Model name Outdoor unit RA V - P ower supply T ype Compressor Motor (kW) P ole Refrigerant charged (kg) Refrigerant control Standard length (m) Min.
– 14 – 20 18 16 14 12 10 02 0 4 0 6 0 Compressor speed (rps) 80 100 120 8 6 4 2 0 Current (A) 20 22 22 18 16 14 12 10 0 2 04 06 0 Compressor speed (rps) 80 100 120 8 6 4 2 0 Current (A) • Conditions Indoor : DB27˚C/WB19˚C Outdoor : DB35˚C Air flow : High Pipe length : 7.
– 15 – 2 . CONSTR UCTION VIEWS (EXTERNAL VIEWS) RA V -SM1103A T -E1, RA V -SM1403A T -E1 365 17.5 17.5 21 21 40 70 29 90 191 20 40 39 47 43 43 95 600 150 60 26 Knock out (For dr aining) Knock out .
– 16 – RBC-TWP30E2, RBC-TWP50E2 (Simultaneous T win) Inner diameter Ø C Inner diameter Ø D Inner diameter Ø D A B Model (RBC-) TWP30E2 Liquid side Gas side TWP50E2 Liquid side Gas side ABCD 36 14 Ø9.5 Ø6.4 43 23 Ø15.9 Ø12.7 34 14 Ø9.5 Ø9.
– 17 – 3 . REFRIGERA TING CYCLE DIA GRAM RA V -SM1103A T -E1, RA V -SM1403A T -E1 Indoor unit Outdoor unit Distributor (Strainer incorporated) TCJ sensor Air heat e xchanger Strainer Strainer TC sensor Strainer Ball valv e Outer dia. ØA P ack ed v alve Outer dia.
– 18 – * 4 poles are provided to this compressor . The compressor frequency (Hz) measured with a clamp meter is 2 times of rev olutions (r ps) of the compressor . RAV-SM1103AT-E1 Pressure Pipe surface temp. Temp * Comp. * Comp. (MPa) (kg/cm 2 G) Pd Ps Pd Ps TD TS TC TL TE Hz Fan In Out Cooling Standard 3.
– 19 – 4. WIRING DIA GRAM.
– 20 – 5. SPECIFICA TIONS OF ELECTRIC P AR TS Compressor Outdoor f an motor Reactor 4-wa y valv e coil High-pressure SW PMV coil P .C . board Fuse Fuse Fuse Surge absorber Rectifier Electrolytic c.
– 21 – 6. REFRIGERANT R410A This air conditioner adopts the new refrigerant HFC (R410A) which does not damage the ozone la yer . The working pressure of the new refrigerant R410A is 1.
– 22 – T able 6-2-1 Thicknesses of annealed copper pipes 1. Joints F or copper pipes, flare joints or sock et joints are used. Prior to use, be sure to remove all contaminants . a) Flare Joints Flare joints used to connect the copper pipes cannot be used f or pipings whose outer diameter exceeds 20 mm.
– 23 – c) Inser tion of Flare Nut d) Flare Processing Make certain that a clamp bar and copper pipe have been cleaned. By means of the clamp bar , perform the flare processing correctly . Use either a flare tool for R410A or con ventional flare tool.
– 24 – 43˚to 45˚ 45˚to 46˚ AB C D Fig. 6-2-2 Relations between flare nut and flare seal surface 2. Flare Connecting Procedures and Precautions a) Make sure that the flare and union por tions do not have an y scar or dust, etc. b) Correctly align the processed flare surface with the union axis .
– 25 – 6-3. T ools 6-3-1. Required T ools Ref er to the “ 4. T ools ” 6-4. Rechar ging of Refrigerant When it is necessar y to recharge refrigerant, charge the specified amount of new refrigerant according to the f ollowing steps.
– 26 – Gauge manifold [ Cylinder with siphon ] [ Cylinder without siphon ] OUTDOOR unit Gauge manifold OUTDOOR unit Refrigerant cylinder Electronic balance Refrigerant cylinder Electronic balance Siphon 1) Be sure to mak e setting so that liquid can be charged.
– 27 – Nitrogen gas cylinder Pipe Flow meter M Stop valv e F rom Nitrogen cylinder Nitrogen gas Rubber plug 2. Characteristics required for flux • Activated temper ature of flux coincides with the brazing temperature . • Due to a wide effectiv e temperature range, flux is hard to carbonize .
– 28 – 6-6. Instructions for Re-use Piping of R22 or R407C Instruction of W orks: The existing R22 and R407C piping can be reused for our digital in ver ter R410A products installations.
– 29 – 6-6-5. Final Installation Checks Do not apply the refrigerator oil to the flare surface . Existing pipe: NO * Use a new pipes. Clean the pipes or use the new pipes . ∗ In case that a gas pipe Ø1 9 mm or bigger is used f or the outdoor unit of SM80 (3 HP) : (Our R410A model 3 to 6 HP gas pipe size is Ø15.
– 30 – Reference outside diameter (mm) Ø9.5 Ø15.9 Ø19.1 W all thickness (mm) 0.8 1.0 1.0 6-6-6. Handling of Existing Pipe When using the e xisting pipe, carefully check it f or the following: .
– 31 – 7.CIRCUIT CONFIGURA TION AND CONTROL SPECIFICA TIONS 7-1. Outdoor unit control 7-1-1. Prim circuit board (MCC-1630) Compressor output lead P03, P04, P05 P ower supply circuit protection fuse F03 (250V , 3.
– 32 – 7-1-2. Outline of Main Controls 1. Pulse Modulating V alve (PMV) control 1) For PMV with 50 to 500 pulses during operation, respectiv ely . 2) In cooling operation, PMV is controlled with the temper ature difference between TS sensor and TC sensor .
– 33 – Objective model I 1 value [A] SM110 SM140 COOL HEA T COOL HEA T 20.4 21.2 21.2 21.2 3. Current release control The output frequency and the output v oltage are controlled by A C current value detected b y T20 on the outdoor P .C . board so that input current of the inv er ter does not exceed the specified v alue.
– 34 – 4-2. Heating fan control 1) An outdoor f an is controlled by TE sensor , T O sensor and operation frequency . (It is controlled with W1 f or minimum and the maximum is controlled according to the f ollowing tab le.
– 35 – 6. Shor t intermittent operation preventive contr ol 1) For 3 to 10 minutes after oper ation star t, in some cases, the compressor does not stop to protect the compressor e ven if receiving the thermostat-OFF signal from indoor . How ev er it is not abnor mal status.
– 36 – Start of heating operation 0 10 15 c b a d [min.] * TE [ ˚ C] – 5 – 10 – 13 – 18 A zone B zone C zone D zone A zone B zone C zone D zone * F rom 10 minutes to 15 minutes after a heating operation star ted, the minimum v alue of TE is stored in memor y as TEO and the minimum temperature of T O as T oO .
– 37 – 8. TR OUBLESHOOTING 8-1. Summary of T roubleshooting <Wired remote controller type> 1. B ef ore troub leshooting 1) Required tools/instruments • + and – scre wd riv ers, spanners, radio cutting pliers , nippers, push pins for reset s witch • T ester, thermometer , pressure gauge, etc.
– 38 – <Wireless remote contr oller type> 1. B ef ore troub leshooting 1) Required tools/instruments • + and – scre wdr iv ers, spanners, radio cutting pliers , nippers, etc. • T ester, thermometer , pressure gauge, etc. 2) Confirmation points bef ore check a) The f ollo wing oper ations are nor mal.
– 39 – 8-2. T roubleshooting 8-2-1. Outline of judgment The pr imar y judgment to chec k whether a trouble occurred in the indoor unit or outdoor unit is carried out with the f ollowing method.
– 40 – 8-2-2. Other s (Other than Check Code) Lamp indication Operation Timer Ready Simultaneous flash Operation Timer Ready Alter nate flash Check code — — Cause of tr ouble occurrence During.
– 41 – <Operation procedure> 1 2 3 4 Returned to usual display 24 1 3 S E T TIME TIMER S E T TE ST FIL TER L L RE S E T TEMP . CL FA N SA VE A A S WIN G/ FI X VENT M O D E O N / O F F U NI T LOUVER T 8-2-3.
– 42 – 8-2-4. Check Code List (Outdoor) : Go on, : Flash, : Go off AL T (Alter nate): Alternate flashing when there are two flashing LED SIM (Simultaneous): Sim ultaneous flashing when.
– 43 – : Go on , : Flash , : G o o f f AL T (Alter L L nate ): Alt er nate flashin g when there are t w o flashin g LED SIM (Si m ultaneous ): S i m R e m o t e co nt r o ll er F 01 F .
– 44 – Err or mode detected b y indoor unit Operation of dia g nostic functio n C he c k code E 03 E 04 E 08 L 03 L 07 L 08 L 09 L 30 P1 0 P12 P1 9 P 31 F 01 F 02 F1 0 F2 9 E1 0 E1 8 Cause of o p .
– 45 – Err or mode detected b y outdoor unit The indoor unit chec k code has been ramified from 4 series and after . The ramified chec k code is display ed only when combined with 4 -ser ies indoor unit.
– 46 – Operation of diagnostic function Check code Indoor unit before after 3 series 4 series H03 H03 P03 P03 P04 P04 P05 P20 P22 P22 P26 P26 P29 P29 Cause of operation Current detection circuit error Discharge temp. error ∗ Discharge temp. (TD) ov er specified value w as detected.
– 47 – Err or mode detected b y remote contr oller or central contr oller (TCC-LINK) ∗ 2 The check code cannot be displa y ed b y the wired remote controller . (Usual operation of air conditioner becomes unav ailable .) For the wireless models , an error is notified with indication lamp.
– 48 – Contents Err or Displa y ∗ When fixations of the errors w ere overlapped, the latest error is displayed. ∗ When D800 to D804 are slowly flashing or D805 is flashing, push and hold SW800 and SW801 simulta- neously f or 5 seconds or more.
– 49 – 8-2-5. Diagnostic Procedure f or Each Check Code (Outdoor Unit) 1) This section describes the diagnostic method f or each check code displa yed on the wired remote controller . 2) In some cases , a check code indicates multiple symptoms. In this case, confirm LED display on the outdoor P .
– 50 – Check code Outdoor LED displa y — Check and tr oubleshooting (Item without special mention Indicates part of outdoor unit.) [Indoor/Outdoor communication err or] [Case thermostat operation] Check CODE No . [14]. Correct wiring of connectors and terminal blocks.
– 51 – Check code [F04] [F06] [F07] Outdoor LED displa y Check and tr oubleshooting (Item without special mention Indicates part of outdoor unit.) [Dischar ge temp. sensor (TD) err or] • There is a possibility that it is one of the f ollowing errors.
– 52 – Check code [F08] [F12] [F13] [F15] Outdoor LED displa y Check and tr oubleshooting (Item without special mention Indicates part of outdoor unit.
– 53 – Check code [F31] Outdoor LED displa y Check and tr oubleshooting (Item without special mention Indicates part of outdoor unit.) [EEPROM err or] [H01] [Compressor break down] [H02] [Compressor lock] z z z { z z { z z z { Check outdoor P .
– 54 – Check code [H03] Outdoor LED displa y Check and tr oubleshooting (Item without special mention Indicates part of outdoor unit.) [Current detection circuit err or] [L10] [Unset model type] : Only when ser vice P .C. board is used z z z z { z z { z z z z { Check outdoor P .
– 55 – Check code [P04] Outdoor LED displa y <DChec k and troubleshooting (Item without special mention Indicates part of outdoor unit.) ∗ There is a possibility that it is one of the f ollowing errors. Confir m LED on outdoor P .C. board to judge which error it is .
– 56 – Check code [P04] Outdoor LED displa y Check and tr oubleshooting (Item without special mention Indicates part of outdoor unit.) [P ower suppl y error (Vdc)] → Ref er to [P05] column. [High pressure protective operation] → Ref er to [P20] column.
– 57 – Check code Outdoor LED displa y Check and tr oubleshooting (Item without special mention Indicates part of outdoor unit.) [4-way v alve rever sal error] [P19] z z z { Is operation of 4-wa y valve normal? (Check pipe temp . and etc. in cooling/heating operation.
– 58 – Check code [P20] Outdoor LED displa y Check and tr oubleshooting (Item without special mention Indicates part of outdoor unit.) [High pressure pr otective operation] z z { Reset the power supply and then perform test run matching to the season.
– 59 – Check code [P22] Outdoor LED displa y Check and tr oubleshooting (Item without special mention Indicates part of outdoor unit.) [Fan system err or] A single operation of the outdoor f an can be confir med by handling the ser vice s witch SW800, SW801.
– 60 – Check code Check and tr oubleshooting (Item without special mention Indicates part of outdoor unit.) [P26] [P29] Outdoor LED display z { [Short-circuit of compressor drive element] — No code z z { [P osition detection circuit err or] [Other error] Compressor disorder due to sudden change of load, etc.
– 61 – Resistance (k Ω ) (50˚C or low er) Resistance (k Ω ) (50˚C or higher) 0 0 50 100 150 200 0 5 10 15 20 10 20 30 40 50 60 70 80 90 100 T emperature (˚C) Resistance (k Ω ) 0 0 10 20 30 4.
– 62 – Red White Blac k Connector : White Red White Blac k T able Inspection of outdoor unit main par ts No. 1 2 3 P ar ts name Compressor (Model : DA422A3F-12M) Outdoor f an motor (Model : WDF-34.
– 63 – 9. SETUP A T LOCAL SITE AND OTHERS 1. Display r ange on remote controller The setup range (Operation mode/Air volume select/Setup temp) of the indoor unit which was set to the master unit is reflected on the remote controller .
– 64 – Indoor unit power-ON sequence <Cautions at test run> • P ower supply/Indoor/Outdoor serial and Gr wiring: OK • P owers of all indoor units are turned on within 3 minutes. • Reception time f or remote controller operation (After power supply w as tur ned on) 1) When address is OK : Approx.
– 65 – 9-3. Outdoor Unit V arious displays and v arious operations are enab led by push b uttons (ser vice) s witches and LED on the outdoor control P .C . board. Service switc h (SW800, SW801) operations LED display • 4 patterns are provided for LED displa y .
– 66 – 9-3-2. V arious settings on outdoor unit (Existing piping, po wer sav e, cooling-only , etc.) (1) Service s witch setting V arious settings are av ailable b y setting ser vice switches. [Operating method] 1) Check LED display is the initial status .
– 67 – In the case to return the setting to one at shipment from factor y When to return the setting to one at shipment from the factor y due to reinstallation and so on, the setting can be returned in the f ollowing procedure. 1) Check LED display is the initial status .
– 68 – D800 D801 D802 D803 D804 D805 D800 D801 D802 D803 D804 D805 LED displa y Control contents Error displa y (Error which is occurr ing at present) The error which is occurring at present is display ed. LED goes off while an error does not occur .
– 69 – 1-2. Err or displa y The error which is occurring at present and the latest error (the latest error data including one which is occur- ring now) can be confir med b y lighting LED D800 to D805 on the outdoor control P .C. board. A. Error display whic h occur s at present : ON, : OFF , : Rapid flashing (5 times/second) B.
– 70 – C. Sensor , current, compressor operation frequenc y , PMV opening display The v alues, such as the temperature sensor or the current value, which the controller detects are easily confirmed.
– 71 – 2. Special operation f or maintenance check (SW800 and SW801 operations) The follo wing special oper ations for maintenance check can be perf or med by handling the service s witches SW800 and SW801. [Operating method] 1) Check LED display is the initial status .
– 72 – 9-4. Applicable Control of Outdoor unit The f ollo wing controls are enab led by connecting the par t “Application control kit” (TCB-PCOS1E2) sold separ ately . (1) Pow er peak cut control * The capacity of the outdoor unit is saved by the Demand signal from outside and corresponds to the temporary peak cut.
– 73 – Setup of line address of outdoor unit, indoor unit address, and group address Completion of cabling work Turn on power of outdoor unit. Turn on power of outdoor unit. Connect one remote controller with one indoor unit (1 : 1) tentatively with communication cable.
– 74 – 10-2. Address Setup & Gr oup Contr ol <T erminology> Indoor unit No . : N - n = Outdoor unit line address N (Max. 30) - Indoor unit address n (Max.
– 75 – 1-1 Individual (Master/Sub) 2-1 Sub/Header 1-1 Sub/Header 1-2 Sub/Follo wer 3-1 Master/Header 3-2 Sub/Follo wer 3-3 Sub/Follo wer 10-2-2. Automatic Address Example fr om Unset Address (No miswiring) 1.
– 76 – 10-2-3. Automatic Address Example fr om Unset Address (No miswiring) 1. Standard (One outdoor unit) Only turning on sour ce power supply (A utomatic completion) 2. Group operation (Multiple outdoor units = Multiple indoor units with serial communication only , without twin) Only turning on sour ce power supply (A utomatic completion) 3.
– 77 – A B A B T er minal bloc k for remote controller wiring of indoor unit T er minal bloc k Remote controller unit Remote controller wire (Procured locally) 10-3. Remote Contr oller Wiring • Strip off approx . 9 mm the wire to be connected. • For single system, use non pola rity , 2 core wire is used f or wiring of the remote controller.
– 78 – 1 Push SET + CL + TES T b uttons simultaneousl y f or 4 seconds or more . 2 ( ← ← ← ← ← Line ad dress) Using the temperature setup / b uttons, set 12 12 12 12 12 to the CODE No. 3 Using timer time / buttons, set the line ad dress.
– 79 – 2. T o kno w the position of indoor unit body by address • T o confir m the unit No. in the group control (Follow to the procedure during operation) (in this procedure , the indoor units in group control stop .
– 80 – Model name J 806 J 800 J 801 J 802 J 803 J 804 Factory setting (default) - - - - - - RAV-SM1103AT-E1 - Cut - - - - RAV-SM1403AT-E1 - - Cut - - - Reuse the sub heat sink. Applying thermal grease to the surface and the back of the sub heat sink.
– 81 – 12. HO W T O EXCHANGE COMPRESSOR 12-1. E xc hanging Procedure of Compressor (Outline) 12-2. Exc hang e of Compressor For e xchange of compressors , refer to (11) Compressor in Section 13. Detachments . START Has refrigerant recovery work been done? YES Remove the defective compressor.
– 82 – 13. DET A CHMENTS No. c Part name Common procedure Remarks RA V -SM1103A T -E1, RA V -SM1403A T -E1 Pr ocedure CA UTION Nev er f orget to put on the glove s at wor king time, otherwise an injur y will be caused b y the parts, etc. 1. Detac hment 1) Stop oper ation of the air conditioner , and also tur n off s witch of the breaker .
– 83 – No. d e Par t name Discharge por t cabinet Side cabinet Pr ocedure 1. Detac hment 1) Perf orm work of item 1 of c . 2) Remov e screws (M4 x 8, 3 pcs.) of discharge por t cabinet f or par tition plate. 3) Remov e screws (M4 (He xagon) x 10, 2 pcs .
– 84 – Inverter assembly Inverter assembly Reactor (Partition plate side) Relay connector Front cover Inverter fixing plate Case thermo lead Complessor lead connector 4way valve PMV There is a hook for the partition board at the rear side. Wire clamp No .
– 85 – No . Part name Pr ocedure Remarks g Outdoor unit control P .C. board 1) P erf or m works of 1 of c , 2) of f . 2) Remo ve the guide. (M4 x 8, 1 pc.) 3) Remov e connectors and lead wires which are connected to the other parts from the cycle P .
– 86 – No. h Par t name F an motor Pr ocedure 1) Perf orm works of items 1 of c , 1 of d , 2) Remov e the flange nut fixing the fan motor and the propeller f an. • Loosen the flange nut by turning clock- wise. ( T o tighten the flange nut, tur n it counterclockwise .
– 87 – No. i P ar t name Compressor Pr ocedure 1) Ev acuate refr iger ant gas. 2) Perf orm works of items 1 of c , 1 of d , e and f . 3) Remo ve screws which fixes the piping panel (F ront) and the bottom plate. (M4 (Hexagon) x 10, 2 pcs .) 4) Remov e screw of the piping panel (F ront) and the piping panel (Rear).
– 88 – Pulse Modulating V alv e (PMV) coil No . Part name Pr ocedure Remarks j k PMV main unit P ositioning projection PMV coil Dent par t Dent par t Dent par t 1 . Detac hment 1) P er f or m w or ks of items 1 of c and e . 2) Remo ve the coil from PMV body while pulling it upward.
– 89 – Discharge port cabinet Bell mouth Remove two screws Discharge port cabinet Bell mouth Minus screwdriver Fan guard Hooking claw Discharge port cabinet Slit (3 positions) Claw (3 positions) Bell mouth Par t name F an guard Pr ocedure 1 . Detac hment 1) Perf orm works of items 1 of c and d .
– 90 – 14. EXPLODED VIEWS AND P ARTS LIST.
– 91 – Location Part No. Description No. 1 43005727 CABINET , AIR, OUTLET 2 43100350 CABINET , FRONT , ASSY , ROHS 3 43100349 CABINET , SIDE, ASSY , R OH S 4 4310A009 PLA TE, R O OF 5 4301V071 GU .
– 92 – Location Part No. Description No. 701 43150351 SENSOR, TD 702 43150350 SENSOR ASSY 703 43150353 SENSOR 704 43150352 SENSOR 705 43150355 SENSOR 706 43F63338 HOLDER, ASSY (SENSOR) 707 4316V49.
TOSHIBA C TOSHIBA C TOSHIBA C TOSHIBA C TOSHIBA C ARRIER CORPORA ARRIER CORPORA ARRIER CORPORA ARRIER CORPORA ARRIER CORPORA TION TION TION TION TION 23-17, T AKANA W A 3 CHOME, MINA TOKU, TOK YO , 108-8580, JAP AN Cop yr ight © 1999 to 2012 TOSHIBA CARRIER CORPORA TION, ALL Rights Reser ved.
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However, one of the most important roles played by the user manual is to help in solving problems with Toshiba RAV-SM1403AT-E1. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Toshiba RAV-SM1403AT-E1 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center