What is defendant's burden to show prejudice from the asserted errors?

Moreover, defendant has not shown prejudice from the asserted errors. It is defendant's burden as appellant to show that any claimed error was prejudicial and to provide an adequate record. (Denham v. Superior Court, supra, 2 Cal.3d at p. 564.) Defendant counters that it is not his burden to show prejudice because he had the right to appointed counsel under the Fifth and Sixth Amendments to the federal constitution, and summary denial without the appointment of counsel violated his right to due process.