Pioneer VSX-52TX Service Manual - Page 124

1 2 3 4 7.1.5 TROUBLE SHOOTING OF THE DSP ASSY • When a sound is not out in the multi-channel signal playback or surround mode with the digital signal input. (SurroundBack is not out with the setting.) • Suppose CR to be poor contact and that is not damaged. A • This shows failure analysis of DSP Assy. Step 0: Preliminary check • Tighten the COAX Jack screws. (GND of the DSP module floats from the chassis. And this unit may not work normally, because the electric potential becomes unstable.) Step 1: Mute pin IC801 B MUTE (pin 54) Is output signal 0V ? Yes End No Replace IC801 C Step 2: B to B connector CN901 Is connector inserted tight ? Yes No Turn the power off and Insert it tight CN701 D Is connector inserted tight ? No Turn the power off and Insert it tight Yes CN951 Is connector inserted tight ? No Turn the power off and Insert it tight E Yes End F Step 3: Regulator IC IC901-pin 1 (to chassis) Is there the input of 5V ? No Check CN901 and REGULATOR Assy Yes IC901-pin 3 (to chassis) Is 3.3V No outputting it ? Replace IC901 Yes IC902-pin 2 (to chassis) Is 1.25V outputting it ? No Replace IC902 Yes End Step 4: 3 → 5V conversion IC952 Pin 3 Does it convert 3V into 5V for 17 pin input? Yes Pin 5 No Replace IC952 Does it convert 3V into 5V for 15 pin input? Yes Pin 7 No Replace IC952 Does it convert 3V into 5V for 13 pin input? Yes A No Replace IC952 124 VSX-52TX 1 2 3 4