Onkyo-TXDS797-avr-sb020012 电路图 维修手册.pdf

ONKYO USA CORPORATION Date 01/30/02 Must also Perform Bulletin 02002-3 For Dolby Digital Audio Drop Out. 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 33 (PN#433223304R1) chip resistors and need not replace IC. * 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: SERVICE BULLETIN: 02001-2 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. Fig1 Fig2 Mandatory: TX-DS797MDDSN#2210029801 TX-DS898MDDSN#2210022501 RadioFans.CN 收音机爱 好者资料库 ONKYO USA CORPORATION Date 02/20/03 * Please check if Service Bulletin 02001-2 is applicable or not. ModelLocationOld Part NumberNew Part NumberNote: TX-DS595Q770122241572R322241572R3IC label 595 TX-DS696Q770122241570R322241570R3IC label 696 TX-DS797Q70222241458R322241458R3IC Label 898 TX-DS898Q70222241458R322241458R3IC Label 898 * In all above models the affected serial numbers are those manufactured prior to 2002. The second digit from left identifies the production year. If the second digit from left is < < 2, then it needs modification. All having second digit 2 need not be modified as the issue has been addressed at the production stage. SERVICE BULLETIN: 02002-3 Models: TX-DS595, TX-DS696, TX-DS797, TX-DS898 Symptom:Audio Dropout when processing Dolby Digital signal input. For Example: Jurassic Park 3 and Pearl Harbor movie titles may play back intermittent in Dolby Digital Mode but OK in DTS mode. In some cases a consumer may claim to have problem processing Dolby Digital from SAT Dish receiver (Direct TV). Cause: Software Hardware (material) incompatible. Solution: Replace parts as per list below. Mandatory RadioFans.CN 收音机爱 好者资料库