Onkyo-TXDS898-dsp-sm 电路图 维修手册.pdf

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1、TX-DS797 and TX-DS898 Pre-amplifier PCB / Volume is removed to create troubleshooting access for the DSP component side. Original position of blue connector wire for P9502 Preparation to work or troubleshoot on DSP as well as possibly power amplifier or other input function PCB assemblies. The proce

2、ss will take 3 to 8 minutes. Front Rear RadioFans.CN 收音机爱 好者资料库 TX-DS797 and TX-DS898 D S P Disconnect P9502 connector wire (Blue) and then remove all 8 screws holding heat sink to the bottom chassis. Remove white ribbon connector from P7701A DSP side. Disconnect all speaker connectors from P6810, P

3、6812, P6008A and P6008B. Remove secondary power connector from P6951 location found on power relay PCB assembly. Set power amplifier on it side as seen above. When attempting to repair or trouble shoot DSP, Video PCB and all input PCBs, follow disassembly given below. RadioFans.CN 收音机爱 好者资料库 TX-DS79

4、7 and TX-DS898 Secondary power connector from P6951 being disconnected. JL6953B and P6952A found to the right may be disconnected. With the power amplifier set on its side, the input PCB assemblies are exposed for easy troubleshooting and repair. Individual PCB may be checked without the other. S-vi

5、deo may not work without the composite, but if the composite works the problem with S-video is simple to asses. Speaker relay is fully functional even though there is no audio passing through as main amp is disabled. For additional ease Tuner module and its support PCB may be removed. RadioFans.CN 收

6、音机爱 好者资料库 TX-DS797 and TX-DS898 All four connectors from P6810, P6812, P6008A and P6008B are disconnected to give ease of movement for the power amplifier module. Amplifier assembly is then lifted from back to the front to stand in its side, The blue wire from P9502 is rerouted to insure amplifier m

7、ovement is simplified. P9502 must be reconnected to make sure DSP and other PCB has the necessary operating voltages. At this point DSP is exposed for troubleshooting. DSP Power supply regulators DSP service mode setup conclusion TX-DS797 and TX-DS898 System control on front panel must remain connec

8、ted via ribbon wire at P7201B DSP PCB Blue connector ribbon wire from P9502 temporarily need be disconnected P7701A connector ribbon wire also needs unplugged to accommodate the vertical pull of the Volume PCB located next to the DSP DSP PCB Volume PCB TX-DS797 and TX-DS898 P5004E, P6101A and P5003E

9、 connector wires are seen still in place. These wire need unplugged and or desoldered to remove Volume PCB NCAF-7262. Spacer Post Wire from P9502 Figure shows volume control completely removed Power amplifier output signal wires to speaker terminal PCB connector terminals P6812E, P6008B, P6810D and P6008A are seen removed. In this block area exist all inputs and output I/F PCBs. Since the main amplifier is standing on its side, All input and DSP PCBs are accessible for trouble shooting. TX-DS797 and TX-DS898