Pioneer VSX-52TX Service Manual - Page 129
Check CN901 and, REGULATOR Assy
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5 6 7 8 • When MCACC is turned to ON (SurroundBack is not out with the setting.) • Suppose CR to be poor contact and that is not damaged. • This shows failure analysis of DSP Assy. A Step 0: Preliminary check Step 3: Regulator IC • Tighten the COAX Jack screws. (GND of the DSP module floats from the chassis. And this unit IC901-pin 1 (to chassis) may not work normally, because the electric potential becomes unstable.) Is there the input of 5V ? No Check CN901 and REGULATOR Assy Step 1: Mute pin Yes IC801 IC901-pin 3 (to chassis) B MUTE (pin 54) Is output signal 0V ? No Replace IC801 Is 3.3V No outputting it ? Replace IC901 Yes Yes End Step 2: B to B connector CN901 IC902-pin 2 (to chassis) Is 1.25V outputting it ? No Replace IC902 C Yes End Is connector inserted tight ? Yes CN701 No Turn the power off and Insert it tight Step 4: 3 → 5V conversion IC952 Pin 3 Is connector inserted tight ? Yes CN951 No Turn the power off and Insert it tight Does it convert No D 3V into 5V for Replace IC952 17 pin input? Yes Pin 5 Is connector inserted tight ? Yes End No Turn the power off and Insert it tight Does it convert 3V into 5V for 15 pin input? No Replace IC952 Yes E Pin 7 Does it convert 3V into 5V for 13 pin input? No Replace IC952 Yes A F VSX-52TX 129 5 6 7 8