Onkyo TXSV-525 Service Information

ONKYO USA CORPORATION

04/26/2003

Classification: Service Tip

Affected models: TXSV636, TXSV525, TXSV535, TXSV727 and ASV620

Problem: R923, 925, 926, 928, 924 burn, and damage PCB. When main PCB not supplied as replacement part do the following.

Solution: First, remove D925, D926, R929, R926, R923, R925, R928, R930, R934, R935, C925, C929, C940, and C944. Clean all fragmented burnt parts of the main PCB. Mount the PCB as shown on Fig 1. Fig. 2 and Fig. 3 shows location where these parts need be soldered. The burnt resistor locations should be free of carbonized PCB fragment by cutting or cleaning the area. You will notice a regulator * in place of R925 and R926 to further stabilize and reduce working temperature.

Fig. 1

JL911a JL701a

Part Number: NANK428 or NANK429

Fig. 3

Fig. 2

C915

Screw Terminals

Add on PCB

Solder at + side of C923

Solder at Input pin of Q925

Solder at J530

Vol. PCB

Wires

Solder at R937 on side that is near JL911a

Solder at J531

Solder to the input pin of Q923

Solder at D932 CATHODE

OTE

Solder at – side of C923

* NOTE: This is a regulator replacing R925 and R926. Part Number is #222780155JRC. If the Dolby Process circuit is working properly the Voltage

Drop across the regulator (Measured across IN and OUT) should not exceed 150mv of difference between DOLBY ON and BYPASS mode. The numbers in a dashed line box are the sequence of soldering to points as described to the right.