Panasonic SAHT730 - DVD THEATER RECEIVER, Technical Manual

Page 1: ...1 Technical Guide 5 DVD Changer Home Theater System SC HT730 SC HT930 Models Practical Servicing of Start Up Shutdown and Video Circuits Panasonic Services Company National Training B02...

Page 2: ...h in this service information by anyone else could result in serious injury or death Copyright 2006 by Panasonic Services Company All rights reserved Unauthorized copying and distribution is a violati...

Page 3: ...Tray Rotation Motor and Related Sensors 11 II SHUTDOWN PROBLEM 12 PROTECTION CONCEPT ALL THE SHUTDOWN POSSIBILITIES 12 Overall Repair Strategy 12 CONTROL UNIT REPAIR SA HT730 SA HT930 STRATEGY 13 Cont...

Page 4: ...of operation for new circuits employed in this line of models Provide drawings with emphasis on signal path to simplify the task of signal tracing and to locate the cause of a defect Furnish troubles...

Page 5: ...how to align the gears for reassembly 1 Power On Start Up Sequence Where is the problem After AC is disconnected the unit always powers on into the DVD operation mode SA HT730 HT930 Power ON sequence...

Page 6: ...sc is found i Sled moves to home position 4 Traverse Motor e Sled moves to home position at center j Sled moves out to initial position 5 IC8251 motor drive Table 2 2 Sensors belts and motor location...

Page 7: ...10 pins Simulated Failures Sensor Cable Symptom Comments 1 Disc Det Q9103 open CN2010 No disc detected no PB possible 2 Tray rotation Q9102 open CN2010 Tray motor rotates back forth for rotation then...

Page 8: ...stops 2 From the bottom of the black tray remove the front silver trim piece not shown 3 Unplug the two front panel cables CN2008 CN2009 and remove the front panel not shown 4 On the main board remove...

Page 9: ...lock position and its line across the gear is horizontal as shown in figure 3 In this gear position the laser assembly is clamped 2 White gear Rotate the now free moving left white gear so that its to...

Page 10: ...or must turn belt and the main black gear into the disc unclamped position Motor resistance 14 ohms Motor volts 8Vdc Between CN2011 pins 8 10 2 Tray out sw S9001 Unplug the unit from AC power Measure...

Page 11: ...ress the power on button Rotate the tray motor gear by hand At CN2010 pin 4 Voltage changes from 0 1Vdc to 4 6Vdc as the tray gear is turned 6 Tray position sensor Q9101 Press the power on button Befo...

Page 12: ...oofer SB WA730 WA930 Start the repair with either unit to first determine which piece houses the problem and then follow the individual Repair Strategy procedure to isolate the problem Control Unit In...

Page 13: ...er to figure 8 In the control unit diagnostic troubleshooting is quickly done from the top of the main board by cutting jumper wires to isolate the problem Cutting specific jumpers on the board to sto...

Page 14: ...em is in the control unit Refer to figures 9 and 10 Either the M9V source Q2803 is missing or the 9Vdc is loaded down reduced Cut jumpers W2413 and W2154 one at a time to determine which load causes t...

Page 15: ...J8 D2852 CN2009 PIN2 W2118 M7 LED S W2549 M7 W2515 L4 MOTOR DRIVES IC2007 pin 7 Tray IC2008 pin7 Loading CN2010 pin8 PHOTO INTERRUPTER Q9103 pin1 W2235 K9 Q2801 C W2231 K7 W2582 K8 W2417 I7 W2855 H6 M...

Page 16: ...SA HT730 SAHT930 16 Control Unit Protection Concept Figure 10 Control Unit Shutdown Simplified Schematic...

Page 17: ...e protection monitoring circuitry in both of the subwoofer left and control unit right feed the microprocessor IC2018 in the control unit If shutdown is triggered the micro via the 25 pin umbilical ca...

Page 18: ...or plug in the control unit but Do not do both 2 On the SB WA930 Subwoofer remove the Front Amp board See subwoofer disassembly diagrams figures 13 14 3 If RLY501 contacts are shorted momentarily plug...

Page 19: ...SA HT730 SAHT930 19 Figure 12 Subwoofer Power On Protection Circuit...

Page 20: ...SA HT730 SAHT930 20 Subwoofer Disassembly Figure 13 Subwoofer Disassembly...

Page 21: ...shown 3 Connect the ground screw terminal to the heat sink as shown in figure 14 4 Install the umbilical system cable if you are troubleshooting with the control unit otherwise you will tack in the 1...

Page 22: ...peakers Refer to figure 15 Notice When a headphone is plugged in all the audio to the subwoofer amplifier is muted so there is no sound from any speaker only to the headphones 1 TV VCR and FM These st...

Page 23: ...t selector to select DVD CD front panel display c On the remote top opaque buttons press DVD so the remote buttons are for DVD mode d On the remote press both the SHIFT and TEST buttons The front pane...