Marantz-SR7500-avr-sb 维修电路原理图.pdf

Approved by N.Sensui Written by S.NAGAO WQ-19 2 817/additional rule 3 (1st Issue 2003-03-19) Date:28-Dec-2004 Model: SR7400/SR7500/SR8500 Page:1 / 1 REF.NBR: MZ04-085 Level Application: Subject: Int.ref: PHENOMENON 1. In condition, AC input is about 10% overvoltage than Rated voltage and the sound is not outputted for a long time. 2. The DIODE (POS NO.D616) may short-circuit. R648 and R649 are broken by this short-circuit. SOLUTION 1. POS.NO R649 RESISTOR (1.5K OHM) is changed to RESISTOR( 2.2K OHM) on the POWER PCB NECESSARY PART POS.NO. R649 nsp (RESISTOR 2.2K OHM 1WJ ) Factory code number KRG1SANJ222RT REMARKS 1. The production of SR7400 / SR8400 has been finished. 2. SR7500/N1S: This improvement has been done in the production serial number MZ010450001274 and after. 3. SR7500/U1B: This improvement has been done in the production serial number MZ010450003001 and after. 4. SR8500/N1S: This improvement has been done in the production serial number MZ010450000430 and after. 5. SR8500/N1B: This improvement has been done in the production serial number MZ010450000001 and after. 6. SR8500/U1B: This improvement has been done in the production serial number MZ010449000796 and after. SR7400 / SR7500 / SR8500 Service Bulletin REF.NBR: MZ04-085 page 2/3 SERVICE BULLETIN FL Display does not light up. See below 1.5 K ohm 2.2 K ohm RadioFans.CN 收音机爱 好者资料库Approved by N.Sensui Written by S.NAGAO WQ-19 2 817/additional rule 3 (1st Issue 2003-03-19) SR7400 / SR7500 / SR8500 Service Bulletin REF.NBR: MZ04-085 page 3/3 SR7500 / SR8500 R649 1.5K ohm SR7400 R648 2.2K ohm D616 Zener Diode part no. 90M-HD302190R R649 1.5K ohm R648 2.2K ohm D616 Zener Diode part no. 90M-HD302190R RadioFans.CN 收音机爱 好者资料库Approved by N.Sensui Written by S.NAGAO WQ-19 2 817/additional rule 3 (1st Issue 2003-03-19) SR7400 POWER PCB SR7500 / SR8500 POWER PCB