background image

FP3700-T41 User Manual

5-3

5.1 Troubleshooting

Does the screen display

correctly?

YES

YES

NO

NO

Is the computer operating?

Start the computer.

YES

NO

Is the RGB cable/

DVI-D cable connected

correctly?

Connect the RGB cable/DVI-D
cable correctly.

 2.4 Cable Diagrams

Adjust the screen display position.

 3.3 Operation Mode

Setup and Display Positioning

There is a problem with the FP
unit.  Please contact your local
FP distributor.

Summary of Contents for Pro-Face FP3700-T41

Page 1: ...FP3700 T41 User Manual Digital Electronics Corporation ...

Page 2: ...r damages or losses resulting from the use of this product All Company Manufacturer names used in this manual are the registered trade marks of their respective companies 2003 Digital Electronics Corporation Thank you for purchasing Digital s TFT type color display panel the FP3700 T41 hereafter referred to as the FP unit The FP unit is a TFT type color liquid crystal display monitor for Windows c...

Page 3: ...tions where sever bodily injury death or major equitment damage will occur Indicates situations where bodily injry or machine damage can occur Warning Caution The list below describes the symbols used in this manual Explains a situation that requires a moderate amount of caution Indicates a word or phrase that has an additional explanation A reference point Describes the word or phrase marked by t...

Page 4: ...ine damage or production stoppage Critical alarm indicators and their con trol activator units must be designed using stand alone hardware and or mechanical interlocks After the FP s backlight burns out unlike the FP s Standby Mode the touch panel is still active If the operator fails to notice that the backlight is burned out and touches the panel a potentially dangerous machine miss operation ca...

Page 5: ...t may cause an explosion The FP is not appropriate for use with aircraft control de vices aerospace equipment central trunk data transmis sion communication devices nuclear power control de vices or medical life support equipment due to these de vices inherent requirements of extremely high levels of safety and reliability When using the FP with transportation vehicles trains cars and ships disast...

Page 6: ...ct sunlight excessively dusty or dirty environments or where chemicals or their vapors are present in the air Avoid restricting the FP s natural ventilation or storing and using the FP in an environment that will increase the FP s internal temperature Do not use the FP in areas where sudden large changes in temperature may occur These changes can cause conden sation to form inside the unit possibl...

Page 7: ...e LCD unit s contrast ad justment Any brightness variations that result are normal for LCD displays There are minute grid points on the LCD surface These points are not defects The displayed color will look different when viewed from an angle outside the specified view angle This is also normal Displaying a single screen image for long periods of time can cause an afterimage to remain To correct t...

Page 8: ... 1 2 1 1 ElectricalSpecifications 2 1 2 1 2 EnvironmentSpecifications 2 1 2 1 3 StructuralSpecifications 2 2 2 2 Functional Specifications 2 3 2 2 1 Performance 2 3 2 2 2 Display 2 3 2 3 Interface Specifications 2 4 2 3 1 Analog RGB Interface 2 4 2 3 2 DVI D Interface 2 6 2 3 3 RS 232C Interface 2 8 2 3 4 USB Interface 2 9 2 4 Cable Diagrams 2 10 2 4 1 RGBInterfaceCablePinConnections Optioncable V...

Page 9: ... Precautions Input Output Signal Lines 3 9 3 3 OperationModeSetupandDisplayPositioning 3 10 3 3 1 Preset Settings and Adjustments for Dip Switch Operation 3 10 3 3 2 Status of Front LED in Operation Modes 3 12 3 3 3 Calibration of OSD Display Position 3 12 CHAPTER 4 TOUCH PANEL DATA 4 1 Touch Interface Data 4 1 CHAPTER 5 TROUBLESHOOTING 5 1 Troubleshooting 5 1 5 1 1 Possible Device Problems 5 1 5 ...

Page 10: ...le to be connected to the FP The FP unit s analog interface is designed for standard VGA mode The number of dots pixels displayed are as follows Size H Sync kHz V Sync Hz Dot Clock MHz Screen Resolution Expansion H Horizontal V Vertical Display Resolution 640 400 24 827 56 000 21 053 640 400 31 469 70 000 25 175 640 480 31 469 59 992 25 175 640 480 37 500 75 000 31 500 640 480 35 000 66 667 30 240...

Page 11: ... monitor The flat front panel provides protection equivalent to the rigorous IP65f standard Even without its optional protective cover the front panel is highly resistant to both water and dust Panel can be used as a VGA Display Since the FP3700 T41 is equipped with an analog RGB interface and a DVI D Interface it can be connected to a PC and other similar devices The PC s dot clock frequency howe...

Page 12: ...that the GLC is securely mounted into a metal panel 1 Designates the type of protection provided 2 Indicates the degree of protection provided to the human body by the unit and the degree of protection provided by the unit s front face from particles dust intrusion into the interior of the unit Here 6 indicates that the unit is completely protected from dust intrusion 3 Indicates the degree of pro...

Page 13: ...2 set FP3700 T41 Installation Guide 1 ACPowerCord 1 CordClamp 1 USB Cable Strap 1 User Manual Installation Guide Package Contents The Power Cord included in the FP unit s package is designed only for AC100V or AC115V use Any other voltage will require a different cord Theseitemshaveallbeencarefullypackedwithspecialattentiontoproductquality However shouldyoufindanythingdamagedormissing pleasecontac...

Page 14: ...ll include the FP be sure to design the FP unit s power cut off switch as a separate disconnect device and locate it where the operator can easily reach it Be sure the unit the FP is built into uses an EN60950 1 approved structure UL c UL CSA Application CE Marking The FP3700 T41 is a UL c UL CSA listed product UL File No E220851 This unit conforms as a product to the following standards UL508 Ind...

Page 15: ...Preface xiv FP3700 T41 User Manual Memo ...

Page 16: ...ace Cable FP61V IS00 O 5m Straight Cable Dsub 9 pin female For Touch data and Command transmission DVI DCable FP DV01 50 5m FP DV01 100 10m XGA standard DVI D 24 pin For image signal output The FP DV01 100 can be used only when connected to a PS 2000B unit Analog RGB Interface Cable FP CV02 45 4 5m XGA standard Dsub 15 pin male For image signal output Chapter 1 Introduction 1 System Design 2 Optio...

Page 17: ...d transmission to the FP This is a straight Dsub9 pin female cable Analog RGB Cable FP CV02 45 Analog RGB interface cable when image signal is output to the FP from the host VGA specifications Dsub15 pin male 4 5m USB Cable FP US00 USB interface cable 5m used for touch panel data transmission between the host and the FP or command transmission to the FP A B type cable DVI D Cable FP DV01 50 FP DV0...

Page 18: ...or less Voltage Endurance AC1500V20mAfor 1 minute between charging and FG terminals Insulation Resistance 10MΩ or higher at DC500V between charging and FG terminals Ambient Operating Temperature 0o C to 50o C the panel face should not incline more than 30o Storage Temperature 10o C to 60o C 30 RH to 90 RH Non condensing wet bulb temperature 39o C or less Air Purity Dust Free of corrosive gasses Po...

Page 19: ...the FP and separate protection measures are suggested Also if non approved oils are present it may cause deformation or corrosion of the front panel s plastic cover Therefore prior to installing the FP be sure to confirm the type of condi tions that will be present in the FP s operating environment If the installation gasket is used for a long period of time or if the unit and its gasket are remov...

Page 20: ...log Resolution 1024 X 1024 Interface Serial Interface RS 232C USB Interface Analog RGB Interface DVI D Interface Video I F Touch Panel I F Graphics Display Unit Size 38 cm 15 in Meas diagonally Type TFT Active Matrix Color LCD Resolution 1024 H X 768 V pixels 1pixel R G B color bits Dot Pitch 0 297mm 0 01 in X 0 297mm 0 01 in Display colors 16 777 216 colors R G B eight bits each Viewing Angles 1 ...

Page 21: ...Size H Sync kHz V Sync Hz Dot Clock MHz Screen Resolution Expansion H Horizontal V Vertical Display Resolution 640 400 24 827 56 000 21 053 640 400 31 469 70 000 25 175 640 480 31 469 59 992 25 175 640 480 37 500 75 000 31 500 640 480 35 000 66 667 30 240 720 400 1 31 469 70 000 28 320 1 42 H 1 92 V 1023 767 800 600 37 879 60 317 40 000 800 600 46 875 75 000 49 500 1024 768 48 363 60 004 65 000 10...

Page 22: ...ND 9 Reserved NC spare for input 10 Digital grounding Digital signal GND 11 Reserved NC spare for input 12 Reserved NC spare for input 13 H SYNC Horizontal synchronous signal input 14 V SYNC Vertical synchronous signal input 15 Reserved NC spare for input Connector MiniDsub15pinmale Connector set screw Inch type 4 40 Cable RGBcablemanufacturedbyDigitalElectronicsCorporationofJapan FP CV02 45 4 5m ...

Page 23: ... 500 75 000 31 500 640 480 35 000 66 667 30 240 720 400 1 31 469 70 000 28 320 1 42 H 1 92 V 1023 767 800 600 37 879 60 317 40 000 800 600 46 875 75 000 49 500 1024 768 48 363 60 004 65 000 1024 768 56 476 70 069 75 000 1024 768 60 023 75 029 78 750 1 6 H 1 92 V 1024 767 1 6 1024 768 1 28 1024 768 1 0 1024 768 1 When you use this resolution select 720 x 400 Display Resolution 720 x 400 DSP in the ...

Page 24: ... CLOCK DVI D Interface Pin Assignments and Signal Names Connector DVI D 24 pin male Connector set screw Inch type 4 40 Cable DVI DcablemanufacturedbyDigitalElectronicsCorporationof Japan FP DV01 50 5 m FP DV01 100 10 m 24 17 8 1 If a cable other than the specified DVI D cable is used product perfor mance cannot be guaranteed due to the possibility of noise interfer ing with the FP unit s operation...

Page 25: ...Assignments and Signal Names Connector Dsub9pinfemale Connector set screw Inch type 4 40 Cable SIOcablemanufacturedbyDigitalElectronicsCorporationofJapan FP61V IS00 O 1 CD DTR and DSR are connected together inside of the FP If a cable other than the specified RS 232C cable is used product perfor mance cannot be guaranteed due to the possibility of noise interfering with the FP unit s operation 6 9...

Page 26: ...SB Interface USB Interface Pin Assignments and Signal Names Communication Low speed Device Connector B type connector Cable USBcablemanufacturedbyDigitalElectronicsCorporationofJapan FP US00 1 2 4 3 If a cable other than the specified USB cable is used product perfor mance cannot be guaranteed due to the possibility of noise interfering with the FP unit s operation ...

Page 27: ... FP PC RGB cable 1 Analog R Input 2 Analog G Input 3 Analog B Input 4 Reserved 5 Digital ground 6 Return R 7 Return G 8 Return B 9 Reserved 10 Digital ground 11 Reserved 12 Reserved 13 H SYNC Input 14 V SYNC Input 15 Reserved FG FG 1 RED IN 2 GRIN IN 3 BLU IN 4 NC 5 GND 6 RED GND 7 GRN GND 8 BLU GND 9 NC 10 GND 11 NC 12 NC 13 HSYN 14 VSYN 15 NC FG FG RED VIDEO 1 GRN VIDEO 2 BLU VIDEO 3 NC 4 GROUND...

Page 28: ...24 TMDS CLOCK Input FG FG 1 TMDS DATA2 2 TMDS DATA2 3 TMDS DATA2 4 SHIELD 4 NC 5 NC 6 DDC Clock 7 DDC Data 8 NC 9 TMDS DATA1 10 TMDS DATA1 11 TMDS DATA1 3 SHIELD 12 NC 13 NC 14 5V Power 15 GND 5V 16 Hot Plug Detect 17 TMDS DATA0 18 TMDS DATA0 19 TMDS DATA0 5 SHIELD 20 NC 21 NC 22 TMDS CLOCK SHIELD 23 TMDS CLOCK 24 TMDS CLOCK FG FG TMDS DATA2 1 TMDS DATA2 2 TMDS DATA2 4 SHIELD 3 NC 4 NC 5 DDC Clock...

Page 29: ... the FP 1 5VIN Input 2 USB Input Output 3 USB Input Output 4 GND Input Output 1 5VIN Input 2 USB Input Output 3 USB Input Output 4 GND Input Output Output 5VIN 1 Input Output USB 2 Input Output USB 3 Input Output GND 4 Output 5VIN 1 Input Output USB 2 Input Output USB 3 Input Output GND 4 FP USB cable PC 1 CD Output 1 CD CD 1 Input CD 1 2 RD Output 2 RD RD 2 Input RD 2 3 SD Input 3 SD SD 3 Output ...

Page 30: ...torforanalogRGBinterface F DVI D Interface Connector Connector for DVI D interface G RS 232C Connector Connector for RS 232C serial interface Used for both sending touch panel data to the host and receivingcommandsfromthehost H USB Connector Connector for USB interface Used for both sending touch panel data to the host and receiving commandsfromthehost I Front LED Used to indicate the condition of...

Page 31: ...FP3700 T41 User Manual 2 6 FP Dimensions 2 14 Unit mm in 2 6 FP Dimensions 2 6 1 FP3700 T41 External Dimensions 383 15 08 294 11 57 282 11 1 395 15 55 60 2 36 Top Front Side 5 0 2 44 1 73 34 9 1 37 ...

Page 32: ...FP3700 T41 User Manual 2 6 FP Dimensions 2 15 2 6 2 FP3700 T41 External Dimensions with Installation Fasteners Unit mm in 395 4 15 57 395 15 55 294 11 57 282 11 1 294 4 11 59 383 15 08 320 12 6 ...

Page 33: ...level of panel strength required Check that the installation panel or cabinet s surface is flat in good condition and has no jagged edges If desired metal reinforcing strips can be attached to the inside of the panel near the Panel Cut to increase the panel s strength 2 1 3 Structural Specifications Create the correct sized opening required to install the FP using the installation dimensions given...

Page 34: ...ut installing the gasket refer to Before installing the FP into a cabinet or panel check that the in stallation gasket is securely attached to the unit A gasket which has been used for a long period of time may have scratches or dirt on it and can lose much of its dust and drip resis tance Be sure to change the gasket periodically or when scratches or dirt become visible Be sure to use gasket mode...

Page 35: ...e panel s strength For easier maintenance operation and improved ventilation be sure to install the FP at least 100 mm 3 94 in away from adjacent structures and other equipment Panel thickness should be from 1 6mm 0 06in to 10mm 0 4in Decide the panel s thickness based on the level of panel strength required 2 6 4 FP Installation Dimensions Theinstallationgasket installationfastenersandattachments...

Page 36: ... cause the FP to exceed its standard operating temperature When installing the FP in a slanted panel the panel face should not incline more than 30o When installing the FP in a slanted panel and the panel face inclines more than 30o the ambient temperature must not exceed 40 o C You may need to use forced air cooling fan A C to ensure the ambient operating temperature is 40 o C or below When insta...

Page 37: ...theinstallationfasteners into the FP s insertion slots at the top and bottom of the unit total 8slots 3 Insert each of the fasteners as shown below Be sure to pull thefastenerbackuntilitisflush with the rear of the attachment hole Panel FP Installation panel Hook Panel Cut Insertion Slots Top Bottom Left side Right side ...

Page 38: ...5 3 1 Installation Do not use too much force since it may damage the FP unit A torque of only 0 5 N m is sufficient to tighten these screws 4 Use a Phillips screw driver to tighten each fastener screw and secure the FP in place ...

Page 39: ...eutral line FG Ground Terminal connected to the FP chassis AC Plug Collar ACPlug CordClamp WARNINGS Figure 1 To avoid an electric shock when connecting the FP s power cord termi nals to the power terminal block confirm that the FP s power supply is completely turned OFF via a breaker or similar unit To avoid the dangers of fire electric hazards and equipment damege be sure to use only the specifie...

Page 40: ...posite of step 1 and remove the AC Power Cord from the Cord Clamp 3 2 2 Power Cable Connection USB Cable Strap Attachment Procedure 1 Connect the USB cable to the connector 2 Insert the cable strap into the cable strap holder as shown in figure 1 and tighten the strap until the cable is secured in place USB Cable Strap Removal Feature 3 Push in the cable strap s stopper until the cable strap band ...

Page 41: ...igh voltage highcurrent orinput outputsignallines Connectalightningsurgeabsorber asshownin the diagram to deal with power surges To avoid excess noise make the power cable as short as possible Be sure to ground the surge absorber E1 separately from the FP unit E2 Select a surge absorber that has a maximum circuit voltage greater than the power supply s peak voltage Input Out put Power power input ...

Page 42: ...se a shielded cable and connect the shield to the FP chassis Connect the FP s FG terminal to an exclusiveground diagram a Groundingresistanceofunder100Ω Ifexclusivegroundingisnotpossible useacommonconnectionpoint diagram b Thegroundingwireshouldhavea cross sectional area greater than 2mm2 Make the connection point as close to the FP unit as possible and make the wire as short as possible Whenusing...

Page 43: ...P unit s Dip Switches are preset as shown below These settings are made on the assumptionthataWindows compatiblecomputerisused SW1 8 Reserved Set this switch to OFF SW1 7 Reserved Set this switch to OFF SW1 6 Reserved Set this switch to OFF SW1 5 Switch between analog RGB and DVI D input SW1 4 Reserved Set this switch to OFF SW1 3 Reserved Set this switch to OFF SW1 2 Display hide the OSD SW1 1 Sw...

Page 44: ...en the switch is set to ON USB is used The default setting is OFF RS 232C SW1 2 Dip Switch SW1 2 is used to display or hide the OSD To hide the OSD set the switch to ON To display the OSD set the switch to OFF The default setting is OFF OSD is displayed SW1 5 Dip Switch SW1 5 is used to change the image input method When the switch is set to ON DVI D image input method is used When the switch is s...

Page 45: ... Input of Image LED 3 3 3 Calibration of OSD Display Position 1 How to start the OSD V indicates the version of the OSD Displayed screen Using the OSD Icons on the screen are used to operate the OSD When you start up the OSD the top menudisplays Touchingtheiconoftheitem you want to adjust displays its submenu or settingchangescreen Inthesettingchange screen and icons are used to change the setting...

Page 46: ... quit the OSD Changes settings such as activating the click sound Resets the current OSD value to the default value Automaticallyadjusts the contrast and the brightness PHASE Displays the resolution of the input image data AUTO GAIN Item Function Adjusts the backlight brightness 9 levels Adjusts the input signal and the dot clock position 32 levels Adjusts the vertical position of the screen Adjus...

Page 47: ...tbuttons Applies the setting and then returns to the contrastadjustmentscreen Cancels the setting and then returns to the contrastadjustmentscreen Adjustmentbuttons Applies the setting and then returns to the contrastadjustmentscreen Cancels the setting and then returns to the contrast adjustment screen Adjustmentbuttons Appliesthesettingandthenreturnstothemainmenu Cancels the setting and then ret...

Page 48: ...ainmenu Cancels the setting and then returns to the main menu Adjustmentbuttons Appliesthesettingandthenreturnstothemainmenu Cancels the setting and then returns to the main menu Be sure to perform the auto gain control when the screen has both 100 black and 100 white areas displayed SYSTEM Enables disablestheclicksound Withthis parameter the sound level can also be adjusted Defaultvalue OFF Click...

Page 49: ... dependingonthe typeofbacklightproblem Enables disables the screen display Auto OFF function and sets the time when the Auto OFF functionisenabled Default OFF AutoOFFfunctiondisabled TheAutoOFFfunctionautomaticallyturnsoffthe displaytopreventthescreenfromburningout when the touch panel is not used for some period of time With this parameter you can set the time intervaltoturnoffthescreendisplay ho...

Page 50: ...eset If the power is turned OFF without saving the set value that data will disappear The last saved data will be read into the system when the FP starts To enable the changed value be sure to press the SAVE but ton When the OSD automatically closes after 30 seconds of inactivity the set value that you were modifying at the time will be retained If you quit the OSD with the button the value that y...

Page 51: ...FP3700 T41 User Manual 3 18 3 3 Operation Mode Setup and Display Positioning Memo ...

Page 52: ...s 98 WindowsNT Windows 2000 Windows XP PL TD000 1 Feature included in the touch I F program Since the FP uses an analog type touch panel all 1024 x 768 coordinates can be detected Resolution of the analog touch panel is 1024 x 1024 so a conversion pro gram to convert the coordinates to 1024 x 768 becomes necessary Also a calibration program to adjust the actual touch position is needed Touch Panel...

Page 53: ...tes 0 to 3FFh Added when touch is released Example If the coordinate X 23 11h Y 500 1F4h is touched 11h 0h 17h 1h F4h touched 11h 0h 17h 1h F4h continuousoutputwiththesamelocation movingthelocationwithoutreleasingtouch 11h 0h 17h 1h F4h continuousdataoutputunlessfingerisreleased 11h 0h 17h 1h F4h 10h when released only 1 unit of data is sent X coordinate Y coordinate 11h 10h ...

Page 54: ...sfollows Nodisplay No display appears after the unit is switched on The screen disappears during standard operation The screen does not display normally Touch panel does not respond The touch panel does not respond when pressed Its reaction time is abnormally long 5 1 1 Possible Device Problems This section assumes that the FP is the cause of a prob lem not the host When the host is the problem pl...

Page 55: ...urn OFF the power switch NO YES Is it using the correct powervoltage Is the power supply cable connected properly totheunit There is a problem with the FP unit Please contact your local FPdistributor Fix the power cable connection Chapter 3 Instal lationandWiring Connect the appropriate voltage Chapter 2 Specifi cations IS the dip switch SW1 5 connected to the input interface NO YES Set the Dip Sw...

Page 56: ...uter operating Start the computer YES NO Is the RGB cable DVI D cable connected correctly Connect the RGB cable DVI D cablecorrectly 2 4 Cable Diagrams Adjust the screen display position 3 3 Operation Mode SetupandDisplayPositioning There is a problem with the FP unit Please contact your local FPdistributor ...

Page 57: ...your local FPdistributor When the touch panel does not react or its reaction is very slow after it is pressed follow the flowchart below to find the origin of the problem and the appropriate solu tion Connect the SIO or USB cable correctly 2 4CableDiagrams YES IS the dip switch SW1 1 connected to the input interface NO YES Set the Dip Switch correctly 3 3 Operation Mode Setup and Display Positioni...

Page 58: ...s greatly exceeded of the FP units usable timing range Resolution has been set that is not compatible with the FP unit The PS 2000B unit or a Windows compatible PC s power has not been turned ON Turn on the PS 2000B unit or a Windows compatible PC s power The PS 2000B unit or a Windows compatible PC has not been correctly connected to the FP unit Connect the RGB cable DVI D cable correctly The inp...

Page 59: ...FP3700 T41 User Manual 5 6 Memo ...

Page 60: ...e become dirty useasoftclothmoistenedwithneutral detergent to wipe away any dust or stains Donotcleantheunitwiththinner organic solvents or strong acids Do not use sharp or hard objects such as a mechanicalpencilorscrewdriver topushon thedisplay Thiscoulddamagetheunit Attach the screen protection sheet when usingtheFPinextremelydirtyordusty areas Neutral detergent Protection sheet Thinner Organic ...

Page 61: ...may have scratches or dirt on it and could have lost much of its water resistance Be sure to change the gasket at least once a year or when scratches or dirt become visible Installation Gasket Replacement Procedure 1 Place the FP on a flat level surface with the display facing downwards 2 Remove the old gasket from the FP 3 Attach the new gasket to the FP Be sure to insert the gasket into the FP s...

Page 62: ...efore installing the FP into a panel To keep your FP unit in its best condition please inspect the following points periodi cally FPOperationEnvironment Is the ambient temperature within the allowable range 0o C to 50o C Istheambienthumiditywithinthespecifiedrange 30 RHto90 RH dry bulb temperature of 39o C or less Is the operating atmosphere free of corrosive gasses Electrical Specifications Is th...

Page 63: ...ter turning off the power To avoid burning your skin be sure to wear gloves when replacing the backlight The backlight is very fragile To avoid possible injury do not directly touch the glass or pull the cable Normally the FP unit detects a backlight burnout by monitoring the backlight s current flow However the FP may fail to detect backlight burnout or may only detect it before the backlight bur...

Page 64: ...he cable from the Inverter Insulation Sheet and then free the cable from the cable clamp Next disconnect the cable connector from the Invertor board s backlight connec tor 4 Insert a screwdriver into the two holes points shown below and remove the backlight attachment screws 1 per hole Cable Backlight Connector Cable Clamp Inverter Insulating Sheet Insert a screwdriver 2 holes ...

Page 65: ... in place inside the cable clamp and cover the cable with the Inverter Insulation Sheet Reverse of step 3 Be sure the cable is inserted completely into the backlight connector Failure to do so may cause arcing which can damage the connector Be sure to always change both of the FP backlights at the same time 9 Replace the rear cover and secure it in place using the eight 8 attachment screws The cab...

Reviews: