Polk Mono Signa S4 Service Manual
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Polk Mono Signa S4 Service Manual

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HOME THEATER SYSTEM
Signa S4
• For purposes of improvement, specifications and design are subject to change without notice.
• Please use this service manual when referring to the operating instructions without fail.
• Some illustrations used in this service manual are slightly different from the actual product.
Service Manual
Click here!
On-line service parts list
https://dmedia.soundunited.com/documents/details/28925
(P5)
WEB owner's manual
NA:
http://manuals.polkaudio.com/SignaS4/NA/EN/index.php
EU:
http://manuals.polkaudio.com/SignaS4/EU/EN/index.php
AP:
http://manuals.polkaudio.com/SignaS4/AP/ZH/index.php
JP:
http://manuals.polkaudio.com/SignaS4/JP/JA/index.php
Upload is planned for the time of a future press release.
BEFORE SERVICING THIS UNIT
See Revision History
Confidential
Ver. 1

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Summary of Contents for Polk Mono Signa S4

  • Page 1 Service Manual Ver. 1 HOME THEATER SYSTEM Signa S4 Click here! On-line service parts list https://dmedia.soundunited.com/documents/details/28925 (P5) ONLINE PARTS LIST WEB owner’s manual http://manuals.polkaudio.com/SignaS4/NA/EN/index.php http://manuals.polkaudio.com/SignaS4/EU/EN/index.php http://manuals.polkaudio.com/SignaS4/AP/ZH/index.php http://manuals.polkaudio.com/SignaS4/JP/JA/index.php Upload is planned for the time of a future press release. BEFORE SERVICING THIS UNIT...
  • Page 2 BEFORE SERVICING THIS UNIT SAFETY PRECAUTIONS NOTE FOR SCHEMATIC DIAGRAM HANDLING THE SEMICONDUCTOR AND OPTICS ONLINE PARTS LIST Accessing the Parts List Searching Part Numbers or Ref. Numbers NOTE FOR PARTS LIST SERIAL NUMBER Serial Number Organization SKU Code of this Unit POST-SERVICE PRECAUTIONS Initializing this Unit...
  • Page 3 SAFETY PRECAUTIONS The following items should be checked for continued protection of the customer and the service technician. Leakage current check Before returning the set to the customer, be sure to carry out either (1) a leakage current check or (2) a line to chassis resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the power cord is less than 460 kohms, the set is defective.
  • Page 4 NOTE FOR SCHEMATIC DIAGRAM WARNING: Parts indicated by the z mark have critical characteristics. Use ONLY replacement parts recommended by the manufacturer. CAUTION: Before returning the set to the customer, be sure to carry out either (1) a leakage current check or (2) a line to chassis resistance check.
  • Page 5 ONLINE PARTS LIST Accessing the Parts List Searching Part Numbers or Ref. Numbers (1) Access from the Service Manual You can search a Parts List for part numbers or Ref. numbers. ・ Click the URL link on the cover of the service manual. (1) Enter the part number or Ref.
  • Page 6 (01 ～ 12) 2digit of year serial number SKU Code of this Unit SKU Code NAV Number Product Name Description PBNN 300443-01-00-101 Signa S4 Pwrd NA-120V PBNR 300443-01-00-201 Signa S4 EU-Lmtd 220-240V PBNS 300443-01-00-206 Signa S4 China Only PBNP 300443-01-00-102 Signa S4...
  • Page 7 POST-SERVICE PRECAUTIONS Initializing this Unit 1. Actions The default settings can be restored at any time by clearing all the user data and configuration information in the product to return it to the factory defaults. The firmware is not downgraded. 2.
  • Page 8 ELECTRICAL SCHEMATIC DIAGRAMS BLOCK DIAGRAM and POWER DIAGRAM for Sound bar SCH01 Bar MAIN SYS POWER SCH02 Bar MAIN MT8518S POWER SCH03 Bar MAIN MT8518S & ETH BLOCK DIAGRAM and POWER DIAGRAM for SCH04 Bar MAIN NAND & DDR3 Subwoofer SCH05 Bar MAIN MCU SCH06 Bar MAIN OPT IIS OUT AUX SCH07 Bar MAIN Wire, USB, KEY, LED Connector...
  • Page 9 SCHEMATIC DIAGRAMS SCH01 Bar MAIN SYS POWER 5V /2A OUT 01UBUCK2-SY80882 STB_5V VOUT=0.6*(1+R_1/R_2)=5.1v Vin： 2.5V<Vin<5.5V 1.2V<=EN<6.6V STB_5V Vout= 0.6*(R_1+R_2)/R_2 3.84V POWER SUPPLY (STANDBY) for BT MODULE 15V IN POWER_15V 5V IN BT_3.84V STB_5V R209 0Ω/0603 R208 0Ω/0603 STB_5V STB_3 V3 POWER SMG2036ADJ 40mA...
  • Page 10 SCH02 Bar MAIN MT8518S POWER SOC POWER U11A DVDD_CORE_FB Typ:100mA GNDK DVDD_CORE_FB GNDK VCCK GNDK VCCK GNDK VCCK GNDK VCCK GNDK VCCK 1uF/6.3V/X5R 1uF/6.3V/X5R 1uF/6.3V/X5R 22UF/6.3V/X5R GNDK VCCK GNDK VCCK GNDK VCCK GNDK VCCK GNDK GNDK GNDK GNDK GNDK VPROC GNDK VPROC 3 GNDK...
  • Page 11 SCH03 Bar MAIN MT8518S & ETH 1MΩ U11B VIO18_MT8518S 26MHZ 2020-7-13 AVDD18_PLLGP TP21 DVDD18_IO0 SYSRSTB AVDD18_PLLGP SYSRSTB VIO18_MT8518S VIO33_MT8518S XTALI XTALO 0Ω/0201 AVDD33_USB SOC IO FOR EP91A7 AVDD33_USB AVDD18_USB 100nF/6.3V/X5R AVSS18_PLLGP AVDD18_USB 22pF/50V/NP0 EP91A7_RSTB 18pF/50V/NP0 AVSS18_PLLGP EP91A7_RSTB 10 EP91A7_A_MUTE XTALI EP91A7_INT EP91A7_A_MUTE 10 XTALI...
  • Page 12 SCH04 Bar MAIN NAND & DDR3 EMI0_DQ16 EMI0_A0 EMI0_DQ0 EMI0_A0 EMI0_DQ17 EMI0_A1 U11E EMI0_DQ1 EMI0_A1 EMI0_DQ18 EMI0_A2 EMI0_DQ0 EMI0_DQ2 EMI0_A2 EMI0_DQ19 EMI0_A3 EMI0_DQ0 EMI0_DQ1 EMI0_DQ3 EMI0_A3 EMI0_DQ20 EMI0_A4 EMI0_DQ1 EMI0_DQ2 EMI0_DQ4 EMI0_A4 EMI0_DQ21 EMI0_A5 EMI0_DQ2 EMI0_DQ3 EMI0_DQ5 EMI0_A5 EMI0_DQ22 EMI0_A6 EMI0_DQ3 EMI0_DQ4 EMI0_DQ6...
  • Page 13 SCH05 Bar MAIN MCU MCU Power STB_3V3 MCU_3V3 Close to MCU NC/500Ω/800mA MCU TO SOC R150 NC/33 SWCLK R155 NC/1K BOOT0 MT8518S_RESET MT8518S_RESET 5 IR 5 SOC_WAKE_UP NC/10K SOC_WAKE_UP 5 TP24 TP25 MCU RES IR_ALERT MCU_3V3 IR_ALERT 5 BOOT0 BOOT0 5 R158 UART NC/10K...
  • Page 14 SCH06 Bar MAIN OPT IIS OUT AUX STB_3V3 STB_3V3 TP27 TP28 STB_3V3 ADC_3V3 3V3_ADC1 5PIN/CKX-3.5-29 AUX_IN_R 7.5K/1% AUX_R 3V3_ADC1 3V3_ADC1 100K 10UF/6.3V/X7R R105 AUX_IN_L AUX_L R106 220K R107 7.5K/1% 3DG3904M R112 R113 NC/10UF/6.3V 4.7uF/6.3V/X5R VDDA VDDP 0.1uF/16V/X7R AUX_IN_R AUX_in_DET 0.1uF/16V/X7R VDDD R119 R120...
  • Page 15 SCH07 Bar MAIN Wire, USB, KEY, LED Connector TO HDMI BOARD LEVEL_SHIFT TO BT RGB_SCL RGB_SCL RGB_SDA RGB_SDA LED_RESET VIO18_MT8518S VIO33_MT8518S 5,10 LED_RESET KEY1_Power KEY1_Power KEY2_VOL+ KEY2_VOL+ Boot&KEY3_VOL- Boot&KEY3_VOL- KEY4_BT R1239 R1237 KEY4_BT KEY5_Source KEY5_Source BT_SPDIF XP15 BT_SPDIF BT_TX 20P/0.5mm 2.2K BT_RX N_2SK3018...
  • Page 16 SCH08 Bar MAIN AMP SN005805 SYS_3V3 AMP_3V3 AMP_PVDD_R1 AMP_PVDD_R2 POWER_15V R271 220μF/25V Close to XP1 AMP_PVDD_R1 AMP_PVDD_R2 Front_L+ 10μH Front_L+ AMP_FAULT3 AMP_3V3 C310 C311 C312 C313 R272 C316 AMP_FAULT3 AMP_FAULT2 C314 AMP_FAULT2 AMP_FAULT1 0.47uF/25V/X7R C320 AMP_FAULT1 AMP_PDN NC/56Ω AMP_PDN 6PIN/2.5mm C319 TW_L- TW_L-...
  • Page 17 LED11 P0_2 LED7 GREEN:2.7V LED12 P0_3 LED13 LED8 BLUE:2.9V P0_4 LED14 P0_5 LED3 LED15 P0_6 P0_7 LED_RGB LED4 RED:2.1V 地 址 ： LED9 GREEN:2.7V LED10 BLUE:2.9V LED4 LED_RGB LED11 RED:2.1V LED12 GREEN:2.7V LED13 BLUE:2.9V Signa S4: OPEN parts Page LED5...
  • Page 18 SCH10 Bar KEY RGB & Driver LED_5V 地 址 ： RGB*3 RGB&Driver LED_5V LED_RGB LED1 RED:2.1V 1μF/6.3V/X7R 0.1uF/16V/X7R LED2 GREEN:2.7V LED3 BLUE:2.9V LED1 P1_0 LED2 P1_1 RGBSCL LED3 LED_RGB P1_2 LED4 LED14 RED:2.1V RGBSDA P1_3 LED5 LED_RESET P1_4 LED15 GREEN:2.7V LED_RESET RSTN LED6...
  • Page 19 SCH11 Bar KEY KEY & From MAIN Close to the buttons POWER TS-1401 SOURCE TS-1401 BT_Pairing TS-1401 VOL+ TS-1401 VOL- TS-1401 From MAIN Board BT_TX BT_RX BT_SPDIF BT_RESET BT_RESET RGB5V 0Ω LED_5V RGBSCL RGBSCL RGBSDA RGBSDA LED_RESET LED_RESET POWER SOURCE BT_Pairing VOL+ VOL-...
  • Page 20 SCH12 Bar KEY AT2853 BT MODULE PBZ1 BT_3.84V BT RESET ACTIVE HIGH 1.27mm/2*11P Antenna on board AGND AVCC GPIO23 INPUT1R/GPIO45 GPIO22 4PIN/1.25mm INPUT1L/GPIO44 GPIO21 10Ω 10Ω INPUT0R/GPIO43 GPIO20 INPUT0L/GPIO42 GPIO28 SPDIF_RX INPUT2R/GPIO47 GPIO17 BT_SPDIF SPDIF_TX INPUT2L/GPIO46 GPIO16 ATS2853_MODULE BT_LRCLK AOUTTRP/VRO/GPIO38 GPIO15 BT_BCLK AOUTRN/VRO_S/GPIO39...
  • Page 21 SCH13 Bar HDMI EP9511 TO MAIN BOARD 9511_AVDD18 VIO18 9511_PVDD18 VIO18 9511_VDDPLL VIO18 9511_VDD18 VIO18 9511_ARC_VDD18 VDD18:132mA 34mA VIO18 STB_3V3 9511_VDDE 220Ω/500mA 220Ω/500mA 220Ω/500mA 220Ω/500mA PLL_VSS PLL_VSS STB_5V STB_3V3 VIO18 I2S1_DATA1 I2S1_DATA0 I2S1_DATA3 I2S1_DATA2 I2S1_BCK I2S1_LRCLK EP9511_RSTB EP9511_INT POWER_EN_2 EP9511_A_MUTE EP9511_SDA 20pF/50V/NP0 HDMI_SPDIF...
  • Page 22 SCH14 Bar POWER PQ3220 2200pF/630V 2200pF/630V 150K 150K VDR/750V 120uF/450V INDUCTOR_4P GBS3K 20A/150V 20A/150V FUSE_3.15A/250V 20GCML 1000uF/25V 1000uF/25V 250uH min/NC 0.1uF/NC GND1 R12 0 RS1M 270K 0.1uF/50V/X7R 10uF/50V R41 NC/15K R40 NC/47K OB2362 32.4K/1% P-GND GATE P-GND NC/0 NC/3906 BAS316/100V/0.5A R39 NC/10K GATE 100pF/NC...
  • Page 23 SCH15 SubWoofer Power Supply POWER_23V FB608 300Ω/3A PVDD 01UBUCK3-T543021 POWER_23V 1.21V<=EN<7V FB607 300Ω/3A STB_3V3 SYS_3V3 POWER_23V Vout= 0.596*(R_1+R_2)/R_2 Vin： 4.5V<Vin<28V STB_3V3 POWER_23V 3.3V /2A OUT STB_3V3 FB605 100nF/16V/X5R 6.8uH/3A 600Ω/2A 0.1uF/50V/X7R 4PIN/2.0mm 100K/1% 100pF/50V/NP0 560KΩ/±5% DC IN 22K/1% TPS54302 0.1uF/50V/X5R 100K 说...
  • Page 24 SCH16 SubWoofer AMP1 TO Wireless STB_3V3 Module IA9QH5 R628 R713 NC/24PIN/0.5mm 2.2K 2.2K XP15 AMP_FAULT R708 NC/0/1% GPIO_15 AMP_I2C_SDA R705 NC/33 AMP_I2C_SCL R706 NC/33 GPIO_26 PAIRING_KEY R1024 NC/0/1% AMP_PDN R709 NC/0/1% PAIRING_LED R1023 NC/4.7K AMP_I2S_BCLK R643 NC/68Ω/1% AMP_I2S_LRCK R639 NC/68Ω/1% AMP_I2S_MCLK R640 NC/68Ω/1%...
  • Page 25 SCH17 SubWoofer AMP2 P3V3 500Ω/800mA AMP_3V3 C722 S-GND1 4700pF/50V/X7R R719 NC/0 4700pF/50V/X7R 4700pF/50V/X7R AMP_23V POWER_23V FB606 NC/300Ω/3A 0.047uF/50V/X7R 0.047uF/50V/X7R AMP_23V C714 1uF/50V/X5R AP4435GM 2200pF/50V/X7R 330K/1% AMP_3V3 R1027 330K/1% 0.1uF/10V/X5R SUB+ 10μH SUB+ PWR_SW2 R1028 4.7K Q607 PWR_SW2 3DG3904M AVDD PGND_AB AMP_FAULT S-GND1 ADR/FAULT...
  • Page 26 SCH18 SubWoofer POWER 自动化变压器， 新 打样 WF:320uH 58:14:12 RS1M 去掉套管， 新 认 可 R1 62 0.78A RMS 0.35A RMS R2 62 FUSE_3.15A/250V 2.74M/1% 2.74M/1% Io ： 1.5A Ipeak ： 5A 2200pF/630V/M3L 1500pF/1000V/X7R 0.33uF/280V 150K 150K 2.74M/1% 2.74M/1% FT15/13mH 82uF/400V 22nF 22nF VDR/750V 25-GMF820-M1X...
  • Page 27 PRINTED CIRCUIT BOARDS Lead-free Solder When soldering, use the Lead-free Solder (Sn-Ag-Cu). For Sound bar : MA, HDMI, KEY, PW MA (A side) MA (B side) CCX5 C1326 R1212 R1215 R1216 C311 C312 C325 C332 R210 C295 QEU2 R279 ESD19 ESD18 C301 CBK2 REU4...
  • Page 28 For Subwoofer : AMP(SUB), POWER(SUB) AMP(SUB) (A side) AMP(SUB) (B side) C637 R614 R671 C688 C690 R665 LED601 R625 R708 R1025 R672 R1024 R1023 R666 XP16 R624 R623 R615 C697 R667 R669 R668 R670 R620 TM5 TM3 C616 TP16 R622 C618 R621 C617...
  • Page 29 BLOCK DIAGRAM and POWER DIAGRAM for Sound bar...
  • Page 30 BLOCK DIAGRAM and POWER DIAGRAM for Subwoofer...
  • Page 31 WIRING DIAGRAM for Sound bar WIRING DIAGRAM for SoundBar KEY BORAD BT Module 2853 BT Module 2853 KEY X5 KEY X5 RGB LED x5 KEY PCB 20pin 0.5mm FFC MT8518S MAIN BORAD 6P Wire XP14 MT8518S Wireless Module Amplifier 2P Wire DDR 2GB IA3ST4 SN5805*3...
  • Page 32 WIRING DIAGRAM for Subwoofer Subwoofer AMP BORAD Subwoofer POWER BORAD Wireless Amplifier Module TAS5731 IA3ST4 4pin cable 2P Wire AC IN DC-DC TPS54302 PW PCB SUB AMP PCB...
  • Page 33 Remote Code Table IR Code Base IR Customer C891 Code Name Button Code Base model Power (toggle) 0x00 Y (same as S2/S3) Mute (toggle) 0x20 Y (same as S2/S3) TV (OPT/ARC) 0x0F Y (same as S2/S3) Source (AUX) 0x0C Y (same as S2/S3) 0x12 Y (same as S2/S3) Bass Up...
  • Page 34 MECHANICAL DISASSEMBLY Flowchart 1. Rear cover 2. PW PCB 3. MA PCB 4. KEY PCB 5. BACK PLATE ASSY EXPLODED VIEW for Sound bar EXPLODED VIEW for Subwoofer SEALING GASKET VIEW OF AN AIR LEAK PREVENTION PACKAGING VIEW...
  • Page 35 DISASSEMBLY Flowchart • Remove each part following the flow below. • Reassemble the removed parts in the reverse order. • Read "SAFETY PRECAUTIONS" before reassembling the removed parts. • If wire bundles are removed or moved during adjustment or part replacement, reshape the wires after completing the work. Failure to shape the wires correctly may cause problems such as noise. • See "EXPLODED VIEW for Sound bar" • See "EXPLODED VIEW for Subwoofer" Sound bar Subwoofer Rear cover BACK PLATE ASSY DISASSEMBLY DISASSEMBLY 1. Rear cover 5. BACK PLATE ASSY and "EXPLODED VIEW" and "EXPLODED VIEW" Rear cover BACK PLATE ASSY Ref. No. of EXPLODED VIEW : 21 Ref. No. of EXPLODED VIEW : 13 MA PCB PW PCB DISASSEMBLY DISASSEMBLY 3. MA PCB 2. PW PCB and "EXPLODED VIEW" and "EXPLODED VIEW" MA PCB PW PCB Ref. No. of EXPLODED VIEW : 14...
  • Page 36 Explanatory Photos for DISASSEMBLY 1. Rear cover • For the shooting direction of each photos used in this manual, see the photo below. • A, B, C and D in the photo below indicate the shooting directions of photos. Proceeding : Rear cover • The photographs with no shooting direction indicated were taken from the top of the unit. (1) Remove the screws. • Photos of Signa S4 NA are used in this manual. The viewpoint of each photograph for Sound bar Rear View ↑Top Side↑ (Shooting direction : X) Top View ↑Front Side↑ ↓Bottom Side↓ ↓Rear Side↓ Rear View ↑Bottom Side↑ (2) Remove the Rear cover. Remove the connector.
  • Page 37 3. MA PCB 5. BACK PLATE ASSY Proceeding : Rear cover → MA PCB Proceeding : BACK PLATE ASSY (1) Remove the screws. Remove the connector. (1) Remove the screws. Remove the connector. Rear View Top View ↑Top Side↑ ↑Front Side↑ ↓Rear Side↓ Rear View ↑Bottom Side↑ ↓Top Side↓ 4. KEY PCB ↓Bottom Side↓...
  • Page 38 EXPLODED VIEW for Sound bar https://dmedia.soundunited.com/documents/details/28925 Parts List : WARNING: Parts marked with this symbol z have critical characteristics. Use ONLY replacement parts recommended by the manufacturer.
  • Page 39 EXPLODED VIEW for Subwoofer https://dmedia.soundunited.com/documents/details/28925 Parts List : 10 11...
  • Page 40 SEALING GASKET VIEW OF AN AIR LEAK PREVENTION REF No. Part No. Part Name Remarks Q'ty EVA L130*W10*T1.5mm 54-465380-000 Line EVA(T1mm, W20mm*L35mm) Line EVA(T1mm, W20mm*L45mm) EVA L300*W10*T1.5mm 54-465390-000 Coil EVA(T1mm, W1.5mm*L88mm) Coil EVA(T1mm, W2.5mm*L280mm) Coil EVA(T1mm, W2.85mm*L184mm) Coil EVA(T1mm, W2.3mm*L127mm) EVA L170*W10*T1mm 54-464090-000 EVA L86*W10*T1mm 54-464590-000 EVA L92*W10*T1mm 54-464590-000 EVA L67*W31*T1mm 54-465020-000 EVA L356*W10*T1mm 54-464590-000...
  • Page 41 PACKAGING VIEW https://dmedia.soundunited.com/documents/details/28925 Parts List : UK plug (UK Only)
  • Page 42 REPAIR INFORMATION TROUBLE SHOOTING LED STATUS 1. The unit does not power on. LED Color sample 2. Keys do not work. 1. Boot up 3. BT can not work. 2. Tune On 4. AUX IN cannot work. 3. Turn Off (Standby) 5.
  • Page 43 TROUBLE SHOOTING 1. The unit does not power on. 2. Keys do not work. Check the [20pin FFC] and confirm that it is Check the [6pin cable] and confirm that it is connected to the MAIN PCB. Reconnect or use a new [20pin FFC] instead. connected to the MAIN PCB.
  • Page 44 3. BT can not work. 4. AUX IN cannot work. Check the [20pin FFC] and confirm that it is Check the AUX connector [P1] is effective on the connected to the MAIN PCB. Reconnect or use a new [20pin FFC] instead. MAIN PCB.
  • Page 45 5. HDMI ARC cannot work. 7. SUB is interrupted. Check that [U28 : 1pin is about 3.3V], [U28 : 2pin Check that the wireless antenna connector on the is about 5V] and [U28 : 3pin is about 1.8 V] on the Replace the MAIN PCB.
  • Page 46 SPECIAL MODE Special mode setting button b No. 1-1 : While the power is on- down buttons "A", "B", and "C" for at least 5 seconds . b No. 1-2 : While the power is on, hold down buttons "A" on the remote control for at least 10 seconds. b No.
  • Page 47 1. Version Display Mode 3. Initialization Mode 1.1. Actions 3.1. Actions Version information is displayed when the device is started in this mode. The default settings can be restored at any time by clearing all the user data and configuration information in the product to return it to the factory defaults.
  • Page 48 4.2. Locale confirmation 4. Locale settings and confirmation 4.1. Creating the locale settings and confirmation file (1) Insert the power cord plug and turn on the power. (1) Click [Start button] - [Accessories] - [notepad] on the PC to launch the notepad. •...
  • Page 49 5.2. Retail Mode Operation 5. Retail Mode When you enter the Retail Mode, this unit must follow the procedure below. Retail Mode is used to configure this unit to demonstrate its functions in a retail environment in which Operation Remarks the settings must be restricted or locked out.
  • Page 50 • Set up Steps: product Default Value • Step1: Connect AUX and TV analog out Polk Signa S4 SIGNAS4=12 • Step2: Turn On TV OPTIONAL_PARAMETERS are as follows. • Soundbar selects AUX (analog input) as audio source and play. A user can change the volume level <Attribute>=<value>[,OPTIONAL_PARAMETERS]...
  • Page 51 LED STATUS Volume Value Action LED Color sample 11 20-22 #1 : 100%, #2 : 100%, #3 : 80%, #4 : 0%, #5 : 0% ● ● ● 〇 〇 12 23-25 #1 : 100%, #2 : 100%, #3 : 100%, #4 : 0%, #5 : 0% ●...
  • Page 52 7. Input Source & Signal Indication 8. Auto-on Control StatusLEDs light the following pattern to indicate the current input source. Status LEDs light the following pattern to indicate the current Input Source Auto-On Control setting. Status LEDs color depends on the input signal Input Source Input Signal Action...
  • Page 53 11. Bass 14. System Standby via CEC Volume range is 0 - 8 When System Standby via CEC is changed, Status LEDs blinks as followings. Status LED indicates the current volume value using 5 Dot with dimming. Status Action #1-#4 should have 2 step brightness. (50%, 100%) System Standby via CEC is set to #1, #3 LEDs light for 1 second, then blink twice ☀...
  • Page 54 18. Factory Default 22. Retail Mode While the power is On, hold down buttons "Vol+”, "Source” and "Power” for at least 5 seconds. Status Action If Factory Reset becomes active, the Status LEDs blink as shown below. 1 Enter Retail Mode #1 and #3 LEDs blink five times.
  • Page 55 UPDATING PROCEDURE AFTER REPLACING THE MCU, ETC. FIRMWARE UPDATE PROCEDURE 1. Items necessary for update 2. Updating via USB...
  • Page 56 PROCEDURE AFTER REPLACING THE MCU, ETC. The procedure after replacing the MCU (microprocessor), flash ROM, etc. is as follows. PCB Name Ref. No. Description Procedure after Remark Replacement MAIN IA3S4 (BAR) WIRELESS MODULE : Tx (BAR) MAIN IA3S4 (SUB) WIRELESS MODULE : Rx (SUB) Procedure after Replacement A : The software has been written.
  • Page 57 FIRMWARE UPDATE PROCEDURE 1. Items necessary for update Items necessary for update are as follows. Offered / not Offered Update Type Needed Part for Update Requirement Standard Service Equipment Purchase from D&M Article code Download from SDI Not offered by D&M USB flash drive (USB 2.0 : Min 1GB) Via USB •...
  • Page 58 2. Updating via USB 2.4. Displays The latest firmware can be downloaded to a USB memory for updates. 2.1. Connecting to the USB flash drive (1) The update begins automatically, and the LEDs light as shown below. (1) Preparation Status Action •...
  • Page 59 Revision History Ver Page Description Before the change After the change Date 1st version issued 13, Sep. 2021...
  • Page 60 www.polkaudio.com ©2021 Sound United. All Rights Reserved.

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