NAD-C520-cd-mod50101 电路图 维修手册.pdf

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1、PAGE 5-01-01 NAD C520/C521 MODIFICATION PROBLEM: You may receive a complaint of the unit producing a very high whistle noise CAUSE: The step up transformer for the display circuit is humming SOLUTION: 1. Insert a transformer with more varnish impregnation 2. Apply glue to fix the step-up transformer

2、 to the main pcb 3. Add double sided tape between the cushion at the back of the EL display and the front panel pcb. Please refer to the drawing below DOUBLE-SIDED TAPE CUSHION EL PLATE PC SHEETS LCD FRONT PANEL PCB PRODUCTION: This modification will be implemented in production from serialnumber: G0ZC52107201 RadioFans.CN 收音机爱 好者资料库