Sanyo Xp 55 Manual
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-41- ■Chassis Block Diagrams IC201 RGB-SW IC1202 MON. SWIC8001 DV I RECEIVERIC3211,12,13 BUFFER IC9501 CAPTURE IC9401 AI PICTURE, COLOR MANAGEMENT R-LCD PANEL G-LCD PANEL B-LCD PANEL DVI-D INPUT-1 ANALOG INPUTINPUT-2 INPUT-3 NETWORK ORGANIZER IC231 A/D IC211 CLAMP IC4541 BUFFER IC3214BUFFERIC3251BUFFERIC3224BUFFERIC4281BUFFER IC1101 3D-Y/C IC2101 3L-Y/C IC1651 PRE-AMP. IC1141 NT/PAL-SW IC1141 NT/PAL-SW IC4104 CSYNC SW IC3101 VIDEO DECODER IC4531 YUV SWIC4501 SHARPNESSIC2311 A/D IC2341 CLAMP IC4231 VCO IC4201 I/P CONVERTER IC6301,02,03,04 SGRAM IC7801 DACIC1641 I/O EXPANDER IC6301 SDRAM IC1601 LENS SHIFTIC1602 ZOOMIC1611 FOCUS IC304 EEPROM IC4251,61,71 BUFFER PC1 IC5001 AUDIO-SWIC1652 AUDIO-CONTROL IC1631,IC1632 AUDIO-AMP. SPEAKER CONTROL PORT USB R_R/CIC3801 RS-232C DRIVERIC3802 MOUSE I /FIC3803 MOUSE DECODER IC9801 USB CONTROLLERIC801 CPUFA N S SWITCHING POWER SUPPLYACTIVE FILTERLINE FILTERAC 100~240V LAMP BALLAST LAMP S-VIDEO COMPONENT PC2 VIDEOF_R/C IC808 EEPROM IC806 PRESSURE SENSOR IC1871,72 TEMP. SENSOR IC1691 TEMP. SENSOR IC804 FLASH ROM IC808 S-RAM IC1801 I/O EXPANDER D-SUB_15 INPUT-1 DIGITAL INPUT AUDIO DIGITAL RGB ANALOG RGB ANALOG RGB H/V H/V HSYNC H/V H/V G B R H V Y Y/CPB PRH/V Y/C Y/C CVBS Y/CY/C Y,Cb,CrY,Cb,Cr Y,Cb,Cr RGBH/V H/V L/R L/R L/R L/R RGB H/V Video Y/C Audio-L/R Component RGB IC7301 SYNC SEP.IC5304 SYNC SEP. IC5301 MON. SW IC5302 SYNC SW IC351 FLASH IC341 SRAM IC5801,31,61,81 PF_BUFFER IC7821,41,61,81 FAN CONTROL FA N S LEDS IC6602,03 FAN CONTROL MMM POWER FA I L POWER VIDEO Y MOTORS Y Y Cb,Cr RGBRGB RGBH/V PSIG H/V H/V RGB RGB RGB PSIG YUV D-SUB_25 IC1201 RGB-SWIC4101 SELECTOR IC301 SCAN CONVERTER, SYSTEM CONTROL IC401 DIGITAL GAMMA IC501 R-PANEL DRIVER IC1501 R-PANEL DRIVER IC531 G-PANEL DRIVERIC1531 G-PANEL DRIVER IC561 B-PANEL DRIVER IC1561 B-PANEL DRIVER IC4503 SW Chassis over view
-42- RGB(DIGITAL) INPUT DV I - D RGB(ANALOG) IN/OUT G/Y/VIDEO B/CB/PB R/CR/PR H/V V Y/VIDEO CB/PB CR/PR S-VIDEO D-SUB INPUT 2 (BNC) INPUT 1 DIGITAL (DVI-D) ANALOG (D-SUB15) INPUT 3 (RCA) INPUT 3 (DIN) IC1201RGB SW. IC1202RGB SW. IC5301SW. IC5302SYNC SW. IC5304SYNC SEP. IC5312AMP. IC4101SELECTOR IC4102NOR IC4104CSYNC SW. DIGITAL RGB AV SEL0/1 2,4 CG1/CG2 S_SW IN S_IN Yes : L S_IN No : HINPUT 1 : L INPUT 2 : H MONITOR OUT ON : L MONITOR OUT OFF : H 22 M OUT 1 PC_R/G/B CG_R/G/B SCART G_SYNC PC2_H/V PC1_H/VH H V YG H V CG_HSYNC CG_VSYNC 2151_Y/CB/CR 1370_H 1370_V CVBS SVIDEO_Y/C K30P TO MAIN BOARD K10A K30Q K30R 2 24 10 12 14 5 2 13 1 5 313 15,16 17,18 33,34 3,4 7,8 11,123,4 7,8 11,12 15,16 17,18 45,46 49,50,53,54 11 15 20,18,1613,32,5 1,3,5 33,34,35 36,37 43,42,41 44,45 3,2,1 12,10,812,5 14,41,3 4 72226 16 27,26,25 28 16 4 23 IN1 SCL1/SDA1 DDC_CLK/DATA PC1_R PC1_G PC1_B PC1_H PC1_H PC1_V IN2IN3 IC7301SYNC SEP. DIGITAL TMDS DATA TO MAIN BOARD K10BTO MAIN BOARD K10C SEL0:SEL1 = H : H --> INPUT 1 SEL0:SEL1 = L : H --> INPUT 2 SEL0:SEL1 = L : L --> INPUT 3 IC5306 IC5307 IC5308 Inputs & video signal processing stage in AV BOARD Chassis Block Diagrams
-43- Chassis Block Diagrams IC301 SCAN CONVERTER I/F BOARD NETWORK ORGANIZERIC201 RGB-SW IC211CLAMP IC212DAC IC3214BUFFER IC3251BUFFER IC3224BUFFER IC8001 DVI-RECEIVER IC3211 BUFFERIC3212BUFFERIC3213BUFFERIC4251BUFFER IC4503 SW IC4261 BUFFERIC4271BUFFER IC141 IC1101NT 3D-Y/C SEP. IC2101PA L 3L-Y/C SEP. IC1141NT/PAL-SW IC1141NT/PAL-SW IC3101 VIDEO DECODER IC2311 A/D IC4201 IP CONVERTER IC6301, IC6302,IC6303,IC6304 SGRAM IC4281 BUFFER CG OUT PC Analog : L PJ Net : H DIGITAL TMDS DATA CG_RGB SCART(CVBS for RGB Scart Sync Signal) 1370_H/V SVIDEO_Y/C CVBS 2151_Y/CB/CR TP21RTP21GTP21B TPGHSTPGVS TPVD TPHD TP13RCRTP13BCBTP13GY 1,3,522 20,18,16 11,12 7,8 3,4 15,16 NET_RGB NET_H/VSYNC For RGB(SCART) source CG_H/VSYNC 8,10,12 DDC_CLK/DATA DDC_CLKDDC_DATA 5,13,20 4448 47 2 18 4 2 4 2 445 131 31,32 100 101 16 18 15 16 18 15 16 GHS_PW AD_HSGVS_PW 24 12375 15 13 189 189 3 5 1 23 15 84 3 34 1 5 Q114383 25 2714 22 21 9 4 15 14 4 6118 1 5 13 5 41 25,26,27 1 13 2 12 17 9 7 88 76 7 43,441 3 12 2 5 7 86 9 1 NT-PAL C_V C, Y YY CR CY Y HD_V D_HV 2 12 HV C CRGB CBRGB D_R GRGR GG GB GG GB GR GG GB D_G D_B SCL1/SDA1 SCL1/SDA1 SCL6/SDA6 SCL3/SDA3 IC4231 VCO FUNC_IP V_HSYNC V_VSYNC IC4531 YUV SW K10A K70A K70C K40A K10B K10C IC9405DAC IC4541H/V BUFFER 5IC4501SHARPNESS IC4551 IC4552 IC4553 IC2341CLAMP SCL1/SDA1 IIC_AD IC231 A/D SCL3/SDA3SCLK3/SDATA3 1274EN2 TA1370 : L TB1274 : H 1274EN1 CXA2151 : L TB1274 : H PA L : L NTSC : H IC8081EEPROM IC8091EEPROM IC8071BUS SW IC8061BUS SWHDCP_CLK/DATA CG/NET_VS PC_DDC HD_DDC From AV BOARD K30RFrom AV BOARD K30Q From AV BOARD K30P NOT_RGB RGB : L OTHERS : H Video signal processing stage
-44- IC301 SCAN CONVERTER IC9401 AI PICTURE, COLOR MANAGEMENT IC9402 SDRAM IC1501 R-LCD DRIVER IC501 R-LCD DRIVER IC2501 PSIG BUFFER IC2531 PSIG BUFFER R-LCD PANEL G-LCD PANEL B-LCD PANEL IC341 S-RAM IC9501 CAPTURE IC351 FLASH ROM IC304 CONTROL MEMORY SCL5/SDA5 SCLK3/SDATA3/ENB3 RD/WRL/CS PW_RXD/TXDRD/WRL/WRH/CS TP501 TP503TP533 TP308TP307 K25B K25G K25R DR DG DBBAOUT GAOUT BAOUT SDIF 3236624 24 3,4,5 67 23 6096 62 DHS DV S 244 A0-A16 D0-D15 A1-A19 D0-D15 PW_SDA PW_SCLDRSH R +TP531 DGSH G +TP561 DBSH B IC1561 B-LCD DRIVER IC561 B-LCD DRIVER IC1531 G-LCD DRIVER IC531 G-LCD DRIVER IC401 DIGITAL GAMMA CORRECTION LCD panel driving stage Chassis Block Diagrams
-45- Chassis Block Diagrams PORT OUT MOTOR CONTROL IC801 CPU READYLAMP_REPRC1_SW R/C1 RC2_SW SCL3 SDA3SCL6 SDA6 SCL5 SDA5SCL5 SDA5 SCL_AD SDA_AD OPT1OPT2R_C R/C JACKUSBCONTROL PORTKEY SWITTCHLEDR/C RECEIVER Q1851 Q1852 IC1851 LED-On: L RC1: L RC2: L FRONT RC BOARD I/F BOARDNETWORK ORGANIZER CONTROL BOARDAV BOARD SENSOR BOARD POWER BOARD SUB POWER BOARDM DRIVE BOARD MAIN BOARD IC1801I/O EXPANDER IC5801,IC5831, IC5861,IC5881 BUFFER OPTION RESISTORS K10AK30R K10B K8U 5 3 62 1,7 2661 WA RNING 59 11 9 60 25 2 K8J K68A 118 139,140 29,30 51,52 5 119 120 121 122 143 From the power fail detection diodes. IC11013D-Y/C IC1641I/O EXPANDERIC4101SELECTOR IC7301SYNC SEP. IC21013L-Y/C IC3101VIDEO DECODER IC9405DAC IC4231I/P-VCO IC9931I/O EXPANDER IC212DAC IC808EEPROM IC8081EEPROM IC8091EEPROM IC8001DV I RECEIVER IC7801DAC IC8071BUS SW IC8061BUS SW IC401DIGITAL GAMMAIC803FLASH ROM IC9884SERIAL- PARALLEL IC804SRAM IC9851SERIAL- PARALLEL IC9801USB CONTROL IC4201I/P CONV. IC9401AI PICTURE IC9501CAPTURE IC1871TEMP. SENSOR IC1872TEMP. SENSOR IC1691TEMP. SENSOR WRL/READSCL1/SDA1SCL2/SDA2 IC301SCAN CONV. IC231A/D IC2311A/D IC3801RS232C DRIVER IC3802MOUSE. I/F RX*/TX* RXD/TXD SCL*/SDA*SCLK/SDATA IC4861BUFFER KEY1POWER 98 KEY2KEY3 K40A K70AK8TK10C R_R/C PORT OUTPORT OUT IC9883FLIPFLOP PORT OUT PORT OUT PORT OUT R_R/CK70C DSUBRESET SWDVI-D DDC_CLK/DATA LAMP BALLAST BOARD K8X K8L K16I K7B CPU_RESET K8D CN66A K66D CN6A See Power supply & protection circuit IC3803MOUSE. DECODER CPUD0-7 4-5 3,5 21-24 35-3631-26 37-38 51-54 41-42 1,5 K16R K30QK30P K28A IO_ENB VIDEO CONTROLVIDEO CONTROL FA N CONTROL Always Available Always Available CG/NET CLAMPANALOG CLAMP PC DDC HD_DDC IC501,IC1501, IC531,IC1531, IC561,IC1561 LCD DRIVERPANEL_ENB IIC_3 : 113,114 IIC_4 : 109,110 IIC_5 : 59,69 IIC_6 : 58,36 System Controls
-46- ■Power Supply Lines CPU D0-7 IC801 CPU LAMP_DETFA N_SW FAN_DRIVE IC_RESET PFC_SW P_FAILP_FAIL P_FAIL FAN_DRIVE FAN_CONT1 FAN_CONT2 TXD RXD FAN_CONT2FAN_CONT1 FAN_CONT1 FAN_CONT2 FA N_CONT1FA N_DRIVEFA N_CONT2 LAMP_SWIC5801,5831, IC5861,5881 P-FAIL BUFFERQ4807 IC4891 SCL2SDA2 2 1 5VA 5VD 15.5V 3.3V S-5V 15VP 9V S5V S6V D4815 D4816 D4817 10VA15.7V 15.7V9VA3.3V_N5VD_N 16V 10VA S-5VS6V 2.5V12.5V_IP IC1451 D1451 1.8V IC1431 D1431 D8033 2.5V_YC IC2351 IC6616Q6627 IC1161D1103 3.3V_AD1 IC234D234 3.3V_AD23.3V_AD3 IC235D235IC236D236IC2353D2353 IC7821IC7841IC7861IC7881 IC7801 DAC FILTER BOARD SW902 INTERLOCK SWITCHSW905 THERMAL SWITCH LAMP BALLAST BOARD IC1871 TEMP. SENSOR IC806 PRESSURE SENSOR SCL2SDA2 45 4 1 5K7B K8LK6A K7AK6AC CN6A CN6C CN66AK66S K66D K66F K66EK66L K66M K66G K10U K66N K70BCN16C K16R K8X K16I K8D K8G K8E LAMP AC CORD FN905 FN902FN901 111 138 2 123 4 51 52 1-2 9-105-6 9-10 7-8 1-2 10-12 57 12 13 3-4 2 159-11 268 4 53 8 9 10 11 4761-2 AV BOARD M_DRIVE BOARDI/F BOARD SENSOR BOARD MAIN BOARD POWER BOARDSUB POWER BOARD Lamp Error: H Lamp-On: H Power Fail: L For FAN CONTROL For ABNORMAL TEMP. DETECT and for FAN CONTROL CPU D0-7 Reset : LIC_RESET 46Power-On: HPFC_SW 137Power-On: H D4818 SCL2SDA2 2 1 IC1872 TEMP. SENSOR IC1691 TEMP. SENSOR SCL2SDA2 12VMD IC1621 IC8611 5V15V2 IC3102 D3102 D4814D3101 3.3V_DVI IC8031 D8063 C3.3V IC3102 D4809 S2.5V IC392 D392 S3.3V IC391 D391IC3103 3.3V_AV IC1102D1101 D2351 D4819S5V IC6609 9V IC6601 IC6607 9VAV IC6621 5VAVS-5V S5V S5V1.8V_N9VAV5VAVS-5V IC6622 3.3V IC6618 5VD Q6629 5VA Q6622 6VPC 6VPC L6617 15.7V15VP Q6611 12VF1 IC6603Q6603 12VF2 IC6602Q6626 12 12 12 K8M K8N K8OFN904 FN906FN907 12 K8PFN903 1212129-10 7-864 8 5VPC 9 K10A 49-52 K30PK70C 49-52 2 1 1-2 R697,R698 P_FAIL 15 14 13 12 3 2 IC9851 UART IC9882 23 22 L6606 Power supply & protection circuit
-47- No Power - When all the LED indicators are not lighting,the symptom indicates that the primary power supply circuit does not operate properly. Check the power primary circuit and parts as follow; AC cord F601 (Fuse) Line filter board SW905 (Thermal sw.) ......short in normal SW905 opens when the surrounding temperature of the switch exceeds 90°C. SW902 (Interlock sw.) ......short in normal Check the lamp cover is fixed firmly. The projector cannot turn on with lamp cover removal. Overload or over-voltage of power circuit When the feedback circuit detects overload or over-voltage, check the PC602 and peripheral circuits. This projector provides a function which can be specified a defective area simply by indicating the LEDs on the con- trol panel. Connect the AC cord and press the Power button once and then check the LED indication. - When both of the TEMP WARNING (red) and READY (green) indicators are flashing at the same time, the symptom indicates that the projector detected an abnormality in the cooling fan operation or in the power supply secondary circuits. Check fan operation and power supply lines, and the driving signal status. Detected the abnormality on the secondary power supply lines. Power failure detection diodes detect abnormal voltage on the power supply circuits. POWER_FAIL (Error:L) signals are sent to IC5801, IC5831, IC5861, IC5881 and each IC detect the power fail signal, the main CPU IC801 sets the projector into the standby mode and indicates error mode with the LEDs flashing. Check the shortage of secondary circuits, ICs, condensers, etc. Check power supply lines, 9VA and 15.7V on the Drive Board, and 3.3V, 5VD, 5VA, S5V, 9V, 15VP and 15.5V on Main Board. Check detection diodes, D1653, D1604 on Drive Board. Check detection diodes on Main Board (refer to the block diagram of power supply systems). Detected the operation stop of cooling fans. Power failure detection diodes detect the fan operation stop. Check Fans FN901, FN902, FN903, FN904, FN905, FN906 and FN907. Check fans power supply lines and detection diodes and transistors D6610, D6614, D6616, D6617, D6618 and Q6609 on Sub Power Board and D7831, D7832, D7851, D7852, D7871, D7872, D7891 and D7892 on Main Board. Abnormality on power starter signals (FAN_DRIVE/ FAN_SW). FAN_SW signal is output from pin 137 of IC801 and applied to power switching circuit through Q4807. It drives the power oscillation circuit in Power Board and power supply for the cooling fans in Sub Power Board. FAN_DRIVE/FAN_SW .............. High in power on Check FAN_DRIVE and FAN_SW signals, switching circuit Q6623, Q6624, Q6604, IC6602, IC6603 and peripheral circuit on Sub Power Board. Abnormality on fan drive signal (IC_RESET). IC_RESET signal is output from pin 2 of IC801 and sent to Q6616, Q6612 and Q6613 on Sub Power Board. They switch power supply lines, 3.3V, 9V, 10VA, 15.7V, 15VP, 15.5V, 5VAV and 9VAV. IC_RESET ................................ High in power on Check IC_RESET signal, IC801 on Main Board, drive transistors and ICs Q6616, Q6617, Q6612, Q6611, Q6613, Q6614, IC6608, IC6618, IC6607 and peripheral circuits. ■Troubleshooting
-48- Reset switch The microprocessor inside the projector may occasionally malfunction and does not allow any controls. In this case, press the reset switch on the rear panel with a sharp tool to restart the projector. - When the WARNING TEMP indicator (red) is flashing,the symptom indicates that the projector detected an abnormal temperature risen inside the projector. Check the air filters and remove the object near the intake and exhaust fan openings, and wait until the WARNING TEMP indicator flashing stops, and then try to turn on the projector. Temperature sensor ICs detect abnormal temperature. Check peripheral circuits and sensor ICs IC1691 on Sensor1 Board, IC1871 and IC1872 on Main Board. - LAMP Circuit Abnormality on power drive signal (LAMP_SW). LAMP_SW signal is output from pin 138 of IC801 and sent to pin 4 of K8L on Main Board through IC4891, and to drive the Lamp Ballast Unit. LAMP_SW ..................................High in power on The lamp does not light LAMP_DET signal (Error: H) is sent from the lamp ballast board and input to pin 111 of IC801, and the CPU turns off the projector. The cooling fans rotate at full speed for cooling down period and then the pro- jector goes to stand-by mode. IC1871 IC1691 IC1872 SW902 F601 SW905 The Locations of Protectors and sensors Troubleshooting
-49- Troubleshooting No Picture The possible causes of No Picture are listed below. Please check following and refer to video signal processing dia- grams in the figure. 1. No picture from Video source Composite Video Input Check composite video signal at pins 3 (Input 2) and 5 (Input 3) of IC4104. Check AV SEL0/1 switching signals at pins 2 and 4 of IC4104. (refer to the block diagram) Check composite video signal at pins 45 and 46 of K30R on AV Board and K10C on Main Board. Check Y, C signals at pins 15 and 14 of IC1141. Check Y, C signals at pins 5 and 7 of IC3101. S-Video Input Check S-video signals at pins 49-50 (Y), 53-54(C) of K30R and K10C. Check Y, C signals at pins 43 and 44 of IC3101. Component Input Check component signals at pins 41 (Pr), 42 (Pb) and 43 (Y) of IC4101. Check component signals at pins 3-4 (Y), 7-8 (Pb) and 11-12 (Pr) of K30R and K10C. Check component signals at pins 2 (Pb), 5 (Y) and 12 (Pr) of IC4531. All of video signals Check component signals (Y, Cb, Cr) at test points TP13GY, TP13BCB and TP13RCR. Check Sync signals (AV_HSYNC, AV_VSYNC) at pins 4 and 9 of IC3101. Check Sync signals (AV_HSYNC, AV_VSYNC) at pins 16 and 28 of IC7301. Check RGB signals at pin 21, 22 and 23 of IC3101. Check RGB signals at pins 15, 14 and 4 of IC4531. Check Sync signals (AV_HSYNC, AV_VSYNC) at pins 5 and 7 of IC4281. 2. No picture from Computer source RGB (Analog) Input Check RGB(Input 1) signals at pins 1, 3 and 5 of IC1201 and at pins 33, 34 and 35 of IC4101. ( IC4101 is for RGB Video source. ) Check RGB(Input 2) signals at pins 12,10 and 8 of IC1201. Check CG1/CG2 signal at pin 22 of IC1201. IN1 : Low, IN2 : High Check RGB signals at pins 3-4, 7-8 and 11-12 of K30Q on AV Board and K10B on Main Board. Check RGB signals at pins 1, 3 and 5 of IC201. Check RGB signals at test point TP21R,TP21G and TP21B. Check Sync signals (CG_H/VSYNC) at pins 15-16and 17- 18 of K30Q on AV Board and K10B on Main Board. Check Sync signals (CG_H/VSYNC) at pins 2 and 4 of IC3224.RGB (Scart) Input Check RGB(Scart) signal at pins 1, 3 and 5 of IC1201. Check RGB signals at pins 3-4, 7-8 and 11-12 of K30Q on AV Board and K10B on Main Board. Check RGB signal at pins 25,26 and 27 of IC3101. Check Scart Sync signal at pins 33 and 34 of K30Q on AV Board and K10B on Main Board. Check Scart (composite video signal )Sync signal at pin 41 of IC3101. RGB (Network) Input Check RGB signals at pins 8, 10 and 12 of IC201. Check RGB signals at test point TP21R,TP21G and TP21B. Check Sync signals (NET_H/VSYNC) at pins 2 and 4 of IC3251. Check CG-OUT signal at pin 22 of IC201. Network : High, PC Analog : Low 3. No picture from DVI source. RGB (Digital) Input Check 5V power supply(5VDVI) at pins 1 and 2 of K10P. Check Sync signal at pins 47 and 48 of IC8001. Check ICs IC8001 and peripheral circuits. 4. No picture from all of sources Check HSYNC signal at test point TPGHS and VSYNC signal at TPGVS. Check RGB S&H signals at test points TP501, TP531 and TP561. Check PSIG signals at test point TP503 and TP533. Check power supply circuit 15.5V and 15VP and peripher- al circuit. Check ICs IC501, IC531, IC561, IC1501, IC1531, IC1561, IC9401, IC401 and peripheral circuits. SIGNAL K30Q/K10B R3-4 G7-8 B11-12 CG_H-Sync 15-16 CG_V-Sync 17-18 CG1/CG2-SW 25-26 Scart-Sync 33-34SIGNAL K30R/K10C AV_Y 3-4 AV_PB 7-8 AV_PR 11-12 AV_H-Sync 15-16 AV_V-Sync 17-18 S_SW-IN 37-38 AV SEL-SW 39-42 C-Video 45-46 S-Y 49-50 S-C 53-54
-50- Troubleshooting No Sound 1. No audio signals at AV input circuit. Check audio signals at pins 1, 12 (CG1), 5, 14 (CG2) and 2, 15 (VIDEO) of IC5001 on AV Board. Check IC5001 and peripheral circuits. 2.Incorrect operation of Input mode switching. Check AUDIO_SW1/AUDIO_SW2 switching signals at pins 9 and 10 of IC5001. The AUDIO_SW1/AUDIO_SW2 sig- nals are output from pins 4 and 5 of IC1801. See the truth table below for input mode selection. 3. No audio output signal at speakers. Check audio signals at pins 3, 4 and 1, 2 of K16S on M Drive Board. Check MUTE signal at pin 8 of K16R/K8T. The MUTE signal is output from pin 49 of IC1801. Mute On : High Check MUTE signal at pins 3 and 14 of IC1652. Check SP OFF signal at pin 9 of K16R/K8T. The SP OFF signal is output from pin 8 of IC1801 and sent to pin 7 of IC1631/IC1632 through Q1681/Q1682. SP OFF signal from IC1801 : High Check SP OFF signal at pin 7 of IC1631/IC1632. SP OFF signal to IC1631/IC1632 : Low Check sound volume signal at pin 7 of K16R/K8T. The VOLUME signal is output from pin 8 of IC9405 and it is controlled by IC801 via the IIC bus. Volume Min.: Low Check audio signals at IC1651,IC1631, IC1632 and periph- eral circuits. 4. No power supply at audio circuit. Check 9VA(9V AUDIO) power supply line. Logic Table of IC5001 Pin 10 Pin 9 Mode LLCOMPUTER 1 HLCOMPUTER 2 LHVIDEO Q5002 Q1681/Q1682 Q5001 Q5005 Q5006 Q5007 2 15 25 3 15 5 14 1 12 2 33 65 12 10 9 10 3,1477 1 77 7 5 514 17 14 17 13 4 5 8 49 Mute: H Mute: HMute: L Monitor out ON : L Monitor out OFF : H 8 43 45 41 3 4 1 2 K10T K30PK16R K10A K30Q K10B K8T K16N K16S IC801 CPU IICSCL IICSDA AU SW1 A MUTE SP OFFVOLUME VOLUME AU SW2 A SW1 A SW2 SP OFF 29 30 31 30 WRL CPU READ CPU 48 43 MAIN BOARD M DRIVE BOARD AV BOARD IC1652 AUDIO-CONTROL IC1631 L-AMP. IC1632 R -AMP. IC1651 PRE AMP. L R L L R L R L RVIDEO AU D IO-IN PC2 AU D IO-IN PC1 AU D I O-IN/OUT (VARIABLE OUTPUT for PC2 only)SP901 SP902L R IC1801 I/O EXPANDER IC9405 DAC 3 18 DATA 1 91IC9883 F. F.IC5002 SW R A MUTE 9 8 7 IC5001 AU D IO-SW A MUTE M OUT 3 1 5 6 23 Audio signal processing circuit