Onkyo TXDS-898, TXDS-797 Sevice Bulletin

ONKYO USA CORPORATION

SERVICE BULLETIN: 02001-2

Date 01/30/02

Mandatory:

Must also Perform Bulletin 02002-2

For Dolby Digital Audio Drop Out.

Models: TX-DS797 / TX-DS898

Symptom: Static like Noise (tic, tic,) occurs when in surround mode with a limited possibility of

Surround Back not functioning.

Cause: Power Supply VCC for Q713 may be too high.

Solution: Reduce VCC or Replace Q713. Must Perform Bulletin 02002-2 For Dolby Digital Audio Drop Out as well.

Procedure: In some units Q713 IC, brand ISSI, IS62LV1024LL-70H was used [Fig1], where as in some NEC MPD441000LGU-B70X may be found. For those units using the ISSI SRAM and having the above aforementioned problem, you will need to replace the IC Q713 with PN#22241793R3 having NEC MPD441000LGU-B70X or Mitsubishi M5MV108DKV-70H brand label. If above part is to be replaced L753 need not be replaced. See Note.

NOTE: For units having not developed such problem and has the ISSI IC in place, it is highly recommended that L753 [Fig2] be changed to 33Ω (PN#433223304R1) chip resistors and need not replace IC.

Fig1

*** After service, please reset the unit following reset procedure. From a power ON state, press and hold Video-1 button and then press Stand-By switch. Unit will clear and shut down.

Units not affected by above changes are:

TX-DS898MDD SN#2210022501~

Fig2