NAD-L70-avr-tb2 维修电路原理图.pdf

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1、PAGE 1 OF 3Technical BulletinL70Product: DVD ReceiverHardware Technical Bulletin: L70-H2004-05Date: June 21, 2004Subject:Fan Kit InstallationNote:Previous T.B.s required:K K K KYESK K K KNODESCRIPTION: The small ventilation fan located on the DVD mechanism, is noisy or isturning too slowly.REASON: T

2、he fan bearing is worn.SOLUTION: Replace the existing fan with the following new fan and parts. This fan is locatedbeside the DVD mechanism. Please note that removal of the dvd mechanism is required for thischange. Note, this fan only runs when the dvd input is selected.The fan kit can be ordered un

3、der the number: HDMKD1245PFS2Kit includes:Copal fan, fan bracket , CN89 WaferR922 82 OHMS ( ORIGINALLY 100 OHMS )R951 91 OHMS (ORIGINALLY 100 OHMS )1. As shown cut the supplied bracket in order to install it with the new fan.2. Secure fan to the bracket and add some glue to the bottom of the bracket

4、 when securing to the chassis. See figure1 and 2.Figure 1Contact:NAD Electronics International633 Granite CourtPickering, ON Canada L1K 3K1Voice: 905-831-0799 FAX 905-837-Cut bracket hereRadioFans.CN 收音机爱 好者资料库PAGE 2 OF 3Technical BulletinL70Product: DVD ReceiverHardware Technical Bulletin: L70-H200

5、4-05Figure 23. Replace R922 (100 ohms)and solder the 82 ohm resistor supplied, to one leg of the male plug andsolder the other to capacitor C 905 + side. This is on the bottom of the main cpu pc board which mountsto the top of the dvd player mechanism.Figure 3Contact:NAD Electronics International633

6、 Granite CourtPickering, ON Canada L1K 3K1Voice: 905-831-0799 FAX 905-837-Glue bottom of bracketto chassisR922 on bottom ofpc board 100 ohmchanges to 82ohm.Fan connectorRadioFans.CN 收音机爱 好者资料库PAGE 3 OF 3Technical BulletinL70Product: DVD ReceiverHardware Technical Bulletin: L70-H2004-054. Glue connec

7、tor to PCB as shown in figure4.Figure 45. Replace 100 Ohm R951 on the main PCB, located under the power amp heatsink and assembly, withthe 91 Ohm supplied.Figure 5Contact:NAD Electronics International633 Granite CourtPickering, ON Canada L1K 3K1Voice: 905-831-0799 FAX 905-837-Right side of receiverTowards Frontpanel