Pioneer 434CMX Service Manual - Page 102

A B C D E F 102 1 1 SD Circuit in Operation Defective Assy Reason for Shutdown 9 Communication failure in main microcomputer RGB RGB Communication failure in main microcomputer or defective peripheral circuits Failure in writing in the main microcomputer 10 Fan failure FAN RGB Failure in the fan motor or fan stopped by attached dust Disconnection of cable 11 Unit having higher temperature AUDIO AMP DIGITAL VIDEO 13 Power decrease of DIGITAL RGB DC-DC POWER SUPPLY RGB Use under high temperature Disconnection of cable Defective DC-DC converter Defective RST IC No startup of 12V Disconnection of cable Point to be Checked Main Ucom Block Main Ucom Block Relay part between CN7402 (R8) and the wire from the fan Surrounding/internal CN5003(AP3) - CN9702(SP1) Digital DD converter Block MAIN UCOM Block CN7408-CN5002 Possible Defective Part Remarks IC7207 Check short / open of communication line (TXD_IF/RXD_IF/CLK_IF/BUSY_IF/CE_IF/REQ_IF) IC7207 Check if the cable is disconnected or not securely connected. Temperature detected by a sensor must not exceed 65°C (TEMP3) /95°C (TEMP2) U5601 IC7206, IC7209, IC7210 Check if the cable is disconnected or not securely connected. Check if 3.3V,2.5V and 1.5V are activated (not short-circuited). Check if the cable is disconnected or not securely connected. 14 Communication failure in IF AV I/O EEPROM 15 Other failures RLS RGB VCC-D1 RGB VCC-D2 RGB Communication failure in EEPROM or defective peripheral circuits Disconnection of cable Defective circuits in the 12V system Defective circuits in the 13.5V and 6.5V systems. I/F Ucom Block CN9051(L0) - CN7205(R7) IC8705 Check short / open of E2P_SCL/E2P_SDA Check if the cable is disconnected or not securely connected. Check for shortcircuits in the 12V system. Check for shortcircuits in the 13.5V and 6.5V systems. 2 2 PDP-434CMX 3 3 • Diagnosis of abnormalities other than shutdown and power-down Symptoms Defective Assy Abnormal Summary Disconnection of cable No power (LED unlit) POWER SUPPLY STB 3.3 V not started AV I/O Defective IF microcomputer No power (The LED remains lit in red and does not light in green.) RGB Defective main microcomputer Key input not effective Disconnection of cable Remote control unit not effective IR RECEIVE Disconnection of cable Defective IR receiver section DIGITAL VIDEO Defective IC4 Abnormal screen (Data of every other dot are abnormal) ADDRESS Defective 114-pin FPC Point to be Checked CN7404 CN7404(AV1)-11 pin IF Ucom Block Main Ucom Block CN4801 - CN9002 CN9001 - CN8702 CN4901 - CN8901 IR IC4 Block CN7101 - CN5001 Possible Defective Part Remarks Check if the connection between the POWER SUPPLY and RGB assemblies is properly made. IC8702 IC7207 U4901 IC5401 ADY1081 Check if the oscillation is normal (X8701 = 32 kHz, X8702 = 9.8 MHz) and if RESET is set to H (IC8703). If communication with the main microcomputer fails approx. 20 seconds after the AC power is on, the main microcomputer may be defective. Check if the cables are not connected or securely connected. Check if the cable is not connected or securely connected. Check if a pulse is output when the key corresponding to Pin 3 of the CN4901 is pressed. Check if an abnormal area in the screen changes when the FPC connected to the address corresponding to the abnormal area is replaced with the one corresponding to the next address. Check that an abnormal area in the screen does not change when the FPC connected to the address corresponding to the abnormal area is replaced with the one corresponding to the next address. Check if the FPC is broken or not securely connected. 4 4