Instruction/ maintenance manual of the product MVH406GH Multiquip
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OPERA TION AND P AR TS MANUAL THIS MANU AL MUST A CCOMP ANY THE EQUIPMENT A T ALL TIMES. T o find the latest revision of this publication, visit our website at: www .
P A GE 2 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH406GH — PR OPOSITION 65 W ARNING.
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 3 NO TES.
P A GE 4 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) T ABLE OF CONTENTS Honda GX390U1SMX2 Gasoline Engine Air Cleaner Assembly ......................................... 44-45 Camshaft Assembly ...........
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 5 www .m ultiquip .com Ordering parts has never been easier! Choose from three easy options: WE ACCEPT ALL MAJOR.
P A GE 6 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — SAFETY MESSA GE ALERT SYMBOLS This Owner's Manual has been developed to provide complete instructions for the safe and efficient operation of the Multiquip MVH- 406GH Plate Compactor .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 7 This equipment, other proper ty , or the surrounding environment could be damaged if you do not follow instructions.
P A GE 8 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — RULES FOR SAFE OPERA TION W ARNING - Read This Manual F ailure to follo w instructions in this manual ma y lead to Serious Injury or e v en Death .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 9 MVH-406GH — RULES FOR SAFE OPERA TION Maintenance Safety ■ NEVER lubricate components or attempt service on a running machine. ■ AL W A YS allow the machine a proper amount of time to cool before servicing.
P A GE 10 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — OPERA TION AND SAFETY DECALS Figure 2. Operation and Safety Decals Figure 2 displa ys the operation and saf ety decals as they appear on the re versib le plate compactor .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 11 MVH-406GH —SPECIFICA TIONS e t a l P e l b i s r e v e R H G 6 0 4 - H V M . 1 e l b a T s n o i t a c i f i c e p S r o t c a p m o C e c r o F l a g u f i r t n e C) g k 0 0 6 , 5 ( .
P A GE 12 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — DIMENSIONS Figure 3. MVH-406GH Reversible Plate Compactor Dimensions S N O I S N E M I D . 3 E L B A T . F E RS N O I S N E M I D A) . m c 0 4 1 ( .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 13 MVH-406GH— FEA TURES Plate Compactor The Mikasa MVH-406GH is a walk behind, reversible plate compactor designed for the compaction of sand, clay and asphalt.
P A GE 14 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH— PLA TE COMP A CT OR COMPONENTS Figure 4. MVH-406GH Reversible Plate Compactor Components Figure 4 illustrates the location of the major components for the MVH-406GH Re v ersible Plate Compactor .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 15 MVH-406GH— ENGINE COMPONENTS Figure 5. MVH-406GH Engine Components INITIAL SER VICING The engine (Figure 5) must be checked for proper lubrication and filled with fuel prior to operation.
P A GE 16 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — PRE-INSPECTION Checking Engine Oil Level 1. T o chec k the engine oil lev el, place the compactor on secure level ground with the engine stopped.
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 17 Checking The Fuel 1. Remove the fuel cap located on top of fuel tank. 2. Visually inspect to see if fuel lev el is low . If fuel is low , replenish with diesel fuel (Figure 12).
P A GE 18 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) Adjusting Handle Height The height of the handle is adjustable for your comfort . 1 . Loosen the butterfly screw (Figure 14). 2 . T u r n the grip clockwise to raise the handle or countercloc k- wise to lower the handle.
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 19 5 . Place the engine ON/OFF switch (Figure 19) in the “ ON ” position. 6 . Grasp the star ter grip (Figure 20) and slowly pull it out. The resistance becomes the hardest at a certain position, corresponding to the compression point.
P A GE 20 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) ST O WING THE HANDLE 1 . Push up the handle upward (Figure 25) until the handle locks in place. Figure 25. Stowing the Handle Normal Shutdown 1 . Retur n the throttle le ver to the ST ART position (Figure 16).
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 21 MVH-406GH — MAINTENANCE Inspection and Maintenance Service T ables. 1 . T o make sure your plate compactor is alw a ys in good working condition before using, carry out the maintenance inspection in accordance with T ables 5 through 7.
P A GE 22 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — MAINTENANCE Engine Oil Replacement: 1 .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 23 MVH-406GH—MAINTENANCE Reinstalling the V -belt Engage V -belt to lower vibrator pulle y and push the V -belt to left side of upper clutch and, in the same manner as in removal, rotate offset wrench clockwise so that the V -belt goes back on.
P A GE 24 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) T roubleshooting See T ables 8 (engine) and 9 (plate compactor) on proceeding pages for engine and plate compactor troubleshooting guide.
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 25 MVH-406GH—TROUBLESHOO TING diagnosis based on the Engine T roubleshooting (T able 8) inf ormation shown below . If the problem cannot be remedied, please leave the unit just as it is and consult our company's business office or service plant.
P A GE 26 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH—TROUBLESHOO TING diagnosis based on the Compactor T roubleshooting (T ab le 9) inf or mation shown belo w .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 27 MVH-406GH—TR OUBLESHOO TING R O T C A P M O C G N I T O O H S E L B U O R T . 9 E L B A T M O T P M Y SE S U A C E L B I S S O PN O I T U L O S . k a e w n o i t a r b i v d n a w o l d e e p s l e v a r T ? s p i l s h c t u l C.
P A GE 28 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — EXPLANA TION OF CODE IN REMARKS COLUMN The contents and part numbers listed in the parts section are subject to change without notice . Multiquip does not guarantee the availibility of the parts listed.
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 29 MVH-406GH — SUGGESTED SP ARE P ARTS MVH-406GH W/ HOND A GX390U1SMX2 ENGINE 1 to 3 Units Qt y . ..... P/N ......................... Description 1 ......... 956100055 .
P A GE 30 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — NAMEPLA TE AND DECALS NAMEPLA TE AND DECALS 1 11 9 8 4 7 10 3 5 -6 (- 6.
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 31 MVH-406GH — NAMEPLA TE AND DECALS NAMEPLA TE AND DECALS NO . P AR T NO . P AR T NAME QTY . REMARKS 1 920201950 DECAL, OIL SAE 10W -30 ........................
P A GE 32 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — VIBRA TING PLA TE ASSY . VIBRA TING PLA TE ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 33 MVH-406GH — VIBRA TING PLA TE ASSY . VIBRA TING PLA TE ASSY .
P A GE 34 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — B ASE AND ENGINE ASSY . BASE AND ENGINE ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 35 MVH-406GH — B ASE AND ENGINE ASSY . BASE AND ENGINE ASSY .
P A GE 36 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — VIBRA T OR ASSY . VIBRA T OR ASSY ..
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 37 MVH-406GH — VIBRA T OR ASSY . VIBRA T OR ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS A 465910010 VIBRA T OR ASSY . .............................. 1 ....
P A GE 38 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — CONTR OL ASSY . CONTROL ASSY ..
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 39 MVH-406GH — CONTR OL ASSY . CONTROL ASSY . NO . P AR T NO .
P A GE 40 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — CONTR OL ASSY . (CONTINUED) CONTROL ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 41 MVH-406GH — CONTR OL ASSY . (CONTINUED) CONTROL ASSY . NO .
P A GE 42 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) MVH-406GH — HAND PUMP ASSY . HAND PUMP ASSY ..
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 43 MVH-406GH — HAND PUMP ASSY . HAND PUMP ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS B * 465910070 A CCUMLA T OR 1 C * 464910080 O-RING DUST ,SEAL,SET ...
P A GE 44 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) GX390U1SMX2 ENGINE — AIR CLEANER ASSY . AIR CLEANER ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 45 AIR CLEANER ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 1 16271ZE2010 P A CKING, ELBO W 1 2 17210ZE3505 AIR CLEANER ELEMENT ...................... 1 .....
P A GE 46 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) GX390U1SMX2 ENGINE — CAMSHAFT ASSY . CAMSHAFT ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 47 GX390U1SMX2 ENGINE — CAMSHAFT ASSY . CAMSHAFT ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 1 12209ZE8003 SEAL, V AL VE STEM 1 2 14100ZF6W01 CAMSHAFT ASSY .
P A GE 48 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) CARBURET OR ASSY . GX390U1SMX2 ENGINE — CARBURET OR ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 49 CARBURET OR ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 1#% 16010ZE2812 GASKET SET 1 2 # 16011ZA0931 V A L VE S ET , FL OA T 1 3 # 16013ZA0931 FL OA T S ET 1 4 # 16015ZE8005 CHAMBER SET , FLO A T .
P A GE 50 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) CONTROL ASSY . GX390U1SMX2 ENGINE — CONTR OL ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 51 CONTROL ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 2 16551ZE3000 ARM, GO VERNOR 1 3 16555ZE3000 ROD , G O VERNOR 1 4 16561ZE3000 SPRING, GO VERNOR 1 5 16562ZE3000 SPRING, THRO TTLE RETURN 1 7 16570ZE3W10 CONTROL ASSY .
P A GE 52 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) CRANKCASE CO VER ASSY . GX390U1SMX2 ENGINE — CRANKCASE CO VER ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 53 CRANKCASE CO VER ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 1 11300ZE3040 CO VER ASSY , CRANKCASE ................... 1 ......... INCLUDES ITEMS W/ # 2 11381ZE3801 P A CKING, CASE CO VER 1 3 15600ZG4003 OIL PLUG .
P A GE 54 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) CRANKSHAFT ASSY . GX390U1SMX2 ENGINE — CRANKSHAFT ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 55 CRANKSHAFT ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 7 13310ZF6W71 CRANKSHAFT CP .
P A GE 56 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) CYLINDER BARREL ASSY . GX390U1SMX2 ENGINE — CYLINDER B ARREL ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 57 CYLINDER BARREL ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 1 12000ZF6417 BARREL ASSY , CYLINDER .
P A GE 58 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) CYLINDER HEAD ASSY . GX390U1SMX2 ENGINE — CYLINDER HEAD ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 59 GX390U1SMX2 ENGINE — CYLINDER HEAD ASSY . CYLINDER HEAD ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 1 12200ZF6406 HEAD COMP ., CYLINDER ................
P A GE 60 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) F AN CO VER ASSY . GX390U1SMX2 ENGINE — F AN CO VER ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 61 GX390U1SMX2 ENGINE — F AN CO VER ASSY . F AN CO VER ASSY .
P A GE 62 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) FL YWHEEL ASSY . GX390U1SMX2 ENGINE — FL YWHEEL ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 63 GX390U1SMX2 ENGINE — FL YWHEEL ASSY . FL YWHEEL ASSY . NO .
P A GE 64 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) FUEL T ANK ASSY . GX390U1SMX2 ENGINE — FUEL T ANK ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 65 FUEL T ANK ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 1 16854ZH8000 R UBBER, SUPPOR T (107MM) 1 3 16955ZE1000 JOINT , FUEL T ANK 1 6 17510ZE3020ZB T ANK CP , FUEL/BLACK/GX390 1 7 17620Z0T305 FUEL T ANK CAP CP .
P A GE 66 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) GX390U1SMX2 ENGINE — IGNITION COIL ASSY . IGNITION COIL ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 67 GX390U1SMX2 ENGINE — IGNITION COIL ASSY . IGNITION COIL ASSY .
P A GE 68 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) GX390U1SMX2 ENGINE — MUFFLER ASSY . IMUFFLER ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 69 GX390U1SMX2 ENGINE — MUFFLER ASSY . MUFFLER ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 1 18310ZE2W61 MUFFLER COMP . (100DB) 1 2 18320ZE2W61 P ROTEC TOR COMP .
P A GE 70 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) GX390U1SMX2 ENGINE — PIST ON ASSY . PIST ON ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 71 PIST ON ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 1 13010ZF6013 RING SET , PIST ON(STD) 1 1 13011ZF6003 RING SET , PIST ON(0.25) 1 1 13012ZF6003 RING SET , PIST ON(0.
P A GE 72 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) GX390U1SMX2 ENGINE — RECOIL ST AR TER ASSY . RECOIL ST ARTER ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 73 RECOIL ST ARTER ASSY . NO . P AR T NO . P AR T NAME QTY . REMARKS 1 28400ZE3W01ZB ST AR TER ASSY .
P A GE 74 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) GX390U1SMX2 ENGINE — LABELS ASSY . LABELS ASSY .
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 75 GX390U1SMX2 ENGINE — LABELS ASSY . RECOIL ST ARTER ASSY . NO .
P A GE 76 — MVH406GH PLA TE COMP A CT OR — OPERA TION AND P ARTS MANU AL — REV . #3 (02/04/14) P A YMENT TERMS T erms of payment f or par ts are net 30 days. FREIGHT POLICY All parts orders will be shipped collect or prepaid with the charges added to the invoice.
MVH406GH PLATE COMPACTOR — OPERATION AND PARTS MANUAL — REV. #3 (02/04/14) — PAGE 77 NO TES.
OPERA TION AND P AR TS MANUAL Y our Local Dealer is: HERE’S HOW TO GET HELP PLEASE HA VE THE MODEL AND SERIAL NUMBER ON-HAND WHEN CALLING © COPYRIGHT 2014, MUL TIQUIP INC. Multiquip Inc , the MQ logo are registered trademarks of Multiquip Inc. and may not be used, reproduced, or altered without written permissi on.
An important point after buying a device Multiquip MVH406GH (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Multiquip MVH406GH yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Multiquip MVH406GH - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Multiquip MVH406GH you will learn all the available features of the product, as well as information on its operation. The information that you get Multiquip MVH406GH will certainly help you make a decision on the purchase.
If you already are a holder of Multiquip MVH406GH, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Multiquip MVH406GH.
However, one of the most important roles played by the user manual is to help in solving problems with Multiquip MVH406GH. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Multiquip MVH406GH 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