Denon-POAA1HD-pwr-sb维修电路原理图.pdf

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1、 100 Corporate Drive Mahwah, NJ 07430 Service Bulletin No. : OST-C1528 Date: July 1, 2009 _ Model: POA-A1HDCI Subject: Change the voltage of power supply for OP amplifier. Countermeasure is applicable only upon claim from the customer. Symptom: The unit goes into protection mode. Solution: Generally

2、 OP amplifier is not defective at +18/-18 volts power supply, but few OP amplifiers was damaged by over +15/-15 volts. COUNTERMEASURE: We pulled down the voltage of the power supply from +18/-18 volts to +15/-15 volts. 1) 1U-3798-1 AMP UNIT: a) IC102, IC103: SA5532ADR (00D2623555901)NJM5532M-D (TE-

3、1)(00D2630898907) b) ZD101, ZD102: HZS22-1 (00D2760480900)HZS20-1TD (00D2760479908) 2) 1U-3798-2 INPUT UNIT: a) JV39, JV42, JV58: Jumper WireHZS3B-2TD (00D2760453911) See the following picture for details. RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 b) Cut the pattern of minus line in IC104. c)

4、Solder the diode HZS3B-2 to the PCB with a RUBBER SHEET under the component (on PC board). d) IC101, IC104: SA5532ADR (00D2623555901)SE5532AD8R2G (232810020503S) 3) 1U-3797-3/4/5/6/7 CONNECT UNIT: a) IC511, IC512, IC513, IC514, IC515: SA5532ADR (00D2623555901)SE5532AD8R2G (232810020503S) b) Cut the

5、pattern of the power supply line for OP amplifier. _ c) Attach the RUBBER SHEET and cloth tape on the printing board. d) Attach the HZS3B-2 (00D2760453911) on the A side of printing board. Caution!: 1) Do not mistake the direction (position) of the diodes. Please verify proper positioning BEFORE sol

6、dering. 2) Do not use the wrong diodes. (There are 2 types of Diodes used.) 3) Do not cut the wrong patterns. Please check it by (DVM) tester. Parts: Ref# Description Part Number JV39, JV42, JV58 HZS3B-2TD 00D2760453911 IC101, IC104, IC511, IC512, IC513, IC514, IC515 SE5532AD8R2G 232810020503S IC102, IC103 NJM5532M-D(TE1)00D2630898907 ZD101, ZD102 HZS20-1TD 00D2760479908 For HZS3B-2TD RUBBER SHEET 00D4610415007 Serial Number Range: Please apply the above modification to the production models in the following serial numbers. (Last 5-digits) 00001 00221