Subaru CM631UD (Clarion PF-3391A-A)
Contents
1. which were left empty at the factory These components can be assembled onto the PCA and provide an additional 8dB of gain for the line out signals The line out signals exist at the 4 zero ohm resistors seen at the center of the image above IC 302 Each one is marked with a small O The second image has the channels marked yes the characters are tiny you ll need to go huge and maybe download the image to see them FL Front Left FR Front Right RL Rear Left RR Rear Right When soldering the outputs to these resistors it doesn t matter which end of the resistor you pick since they are zero ohms iFixit CC BY NC SA www iFixit com Page 8 of 11 Subaru CM631UD Clarion PF 3391A A Line Out Mod Step 12 OK now you have a choice stay with the default gains or install the missing components to increase the gain Also make sure you are comfortable with soldering components this tiny If in doubt practice on an old motherboard with 0603 components before wielding your soldering iron Do not simply wire the output audio connectors to the 4 zero ohm resistors There is a 6V DC bias on these signals and you MUST provide AC coupling The components shown here for each of the 4 channels are 10uF 50V NP Non polarized Aluminum Electrolytic capacitor 300 ohm 1 4W resistor Three different views are shown Note the piece of 16GA copper wire which is looped around the mounting screw2. release the metal tabs which hold the front panel onto the upper case Step 8 Release the rear plate which is thicker so that it can act as a heatsink by removing the two long screws with washers and the remaining 7 screws After the line out mod has been performed the rear plate will not be completely removable without some unsoldering but the unit can still be disassembled There is heatsink compound connecting the power amp IC to the rear plate During reassembly clean this area and apply some new compound Remove the 2 screws which hold the upper case onto the lower case release the ears and lift the upper case off There is an electrical connector between the upper and lower circuit boards which will disconnect iFixit CC BY NC SA www iFixit com Page 6 of 11 Subaru CM631UD Clarion PF 3391A A Line Out Mod Step 9 Views from the rear and front The rear plate has been reattached in the view from the front This PCA is the main system board which has the audio processing IC quad amp and LPF and the power amp at the rear with heatsink compound Step 10 The bottom cover is separated from the main PCA by removing the 5 screws seen in the top view iFixit CC BY NC SA www iFixit com Page 7 of 11 Subaru CM631UD Clarion PF 3391A A Line Out Mod Step 11 The main preamp before the power amp is in this section Note the component locations
3. BY NC SA www iFixit com Page 3 of 11 Subaru CM631UD Clarion PF 3391A A Line Out Mod Step 3 Remove the front panel Start by removing the plastic screws 1 ea side from behind the front panel ears at the lower edge of the case Using 3 flat bladed screwdrivers release 2 clips on one end and a clip on one side Don t wedge these far outwards Work the corner away from the clips Rotate the unit by 180 degrees and release the other 3 clips Pull the front panel gently all the way off Step 4 The connector system used for the front panel has blades instead of pins and seems to be robust iFixit CC BY NC SA www iFixit com Page 4 of 11 Subaru CM631UD Clarion PF 3391A A Line Out Mod Step 5 Using a pair of needle nose pliers remove the CD drive connector Pull straight up to release it Remove the CD drive by unscrewing 4 screws 2 on the front panel underneath the CD slot and 2 on the sides at the upper rear Wedge the tabs of the metal crosspiece attached to the CD drive slightly away from the metal sides of the case to release them Step 6 Lift the CD drive out of the unit starting at the rear iFixit CC BY NC SA www iFixit com Page 5 of 11 Subaru CM631UD Clarion PF 3391A A Line Out Mod Step 7 Remove the front metal plate by removing the 6 screws which hold it to the upper and lower case Use a small flat bladed screwdriver to
4. Subaru CM631UD Clarion PF 3391A A Line Out Mod iF ixiT Subaru CM631UD Clarion PF 3391A A Line Out Mod Line out mod for the Subaru 4 3 LCD screen OEM car stereo sold in the 2012 and up Subaru Impreza and other models This guide shows installation of line out connectors and preamp components for an extra 8dB of gain on the line out signals INTRODUCTION This OEM Subaru stereo has a reasonably bright and useful 4 3 LCD display Bluetooth audio and phone functions HD radio USB file playback and iPod playback The main audio processing IC is an SAF7741 by NXP which provides high quality digital audio processing However the main power amp a Toshiba TB2926HQ limits the performance This guide provides instruction for adding line out signals so that an external power amplifier and or subwoofer can be used An optional step is the addition of components to boost the line out level by 8dB which can improve the signal to noise ratio when an external DSP is used NOTE The factory default equalization is horrendous To remove it with Audio Off showing on the screen hold down the 6 key and rotate the Tune knob until a Version menu appears Release the 6 key then repeat this process twice until the Factory Test Mode 3 Eq menu appears Select OFF Without this step the line out signals would be near useless see the attached Mouser Part Numbers document for the optional parts to or
5. der for the preamp iFixit CC BY NC SA www iFixit com Page 1 of 11 Subaru CM631UD Clarion PF 3391A A Line Out Mod This site although slightly primitive and clearly not written by someone for whom English is a first language has the schematics and service manual Navigate to the Clarion page under Car Electronics http www electronicsrepair net service This modification is not easy but the results are worth it TOOLS PARTS Mini screwdrivers plain and philips 1 Preamp components 1 Precision Soldering Iron 1 iFixit CC BY NC SA www iFixit com Page 2 of 11 Subaru CM631UD Clarion PF 3391A A Line Out Mod Step 1 Main Audio Board Add Line Out ao 9 9 a a a e e e2030 c esesesesesese 233757975733 32020 3 5 a ct PEERED CHE HOO Ook SPSS This is what the front panel looks like for the US model The unit is manfactured by Clarion for Subaru There is a China specific model with different front panel buttons The top of the case shows the Clarion part number PF 3391A A A web search for this part number will find the factory service manual available although not from Clarion Step 2 Remove the top of the case by removing the single screw at the rear then use a small screwdriver to release the top cover from the case starting at a rear corner Lift off the cover which has tabs at the front This exposes the CD drive iFixit CC
6. input connector refer to the schematic and layout drawings for more info Reassemble reinstall and enjoy your hard work To reassemble your device follow these instructions in reverse order This document was last generated on 2015 05 26 06 50 17 AM iFixit CC BY NC SA www iFixit com Page 11 of 11
7. lace due to the large nearby cap C382 removed it before installing the missing components and then reinstalled it although the ground plane made this difficult to unsolder You also MUST remove the 4 zero ohm resistors as shown with a red line through them in the image There is one additional step to take disable the power amp This is done by removing the main board from the lower case and shorting together pins 2 and 4 to hold the power amp in standby This step is not necessary if the missing components are not installed Page 10 of 11 Subaru CM631UD Clarion PF 3391A A Line Out Mod Step 14 Make sure to use a Strain relief on the cables as they pass through the holes you ll need to drill in the rear plate DON T DRILL THE HOLE UNDER THE USB CONNECTOR CUTOUT AS SHOWN HERE Move it down a bit as the USB connector is typically a right angle connector and may interfere It was necessary to trim the connector housing to make it fit Add some hot glue to the edge of the PCB to stabilize it the car dashboard is a horrible place for electronics Make sure that no points on the back of the PCB can short to any of the case parts Testing the completed mod before you put the whole unit back together is an excellent idea It is possible to apply 12V to the unit on the bench first place the upper PCB in place and then temporarily reinstall the front panel Apply 12V from a bench supply to the main
8. screw is removed in the image This point is analog ground and the screw provides support for the little round PCB this is a Radio Shack special isn t it cute The shields of the audio coax also solder to this wire Note that the long leads of the NP caps are soldered directly to the newly installed components be careful doing this You don t want to get one lead soldered and then wedge the whole assembly sideways or the components will be damaged If you elect not to install the missing components solder the cap wires to the 4 zero ohm resistors instead of the components shown here iFixit CC BY NC SA www iFixit com Page 9 of 11 Subaru CM631UD Clarion PF 3391A A Line Out Mod Step 13 a 20311 C382 GS BB c310c338 R323 R343 C323 C340 OR331 R337 3 C327 C331 7 IC302 398 R396 C326 C330 R330 R336 C322 C339 R322 R342 C3092 C337 Y C308 ih 2 oD O lra z On N Q9 C388 L302 iFixit CC BY NC SA www iF ixit com OPTIONAL Install missing components This requires purchase of additional components from mouser com See the guide parts list for more info The image shows the location of the new components you ll also need to install 10307 Seriously though if you re going to add the missing components buy the schematic online so that you have the PCB layout and schematic available for reference It is difficult to solder these components in p
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