LabGruppen Service_Bulletin_2011_no_21_Unstable_18V_circuit电路图.pdf

《LabGruppen Service_Bulletin_2011_no_21_Unstable_18V_circuit电路图.pdf》由会员分享，可在线阅读，更多相关《LabGruppen Service_Bulletin_2011_no_21_Unstable_18V_circuit电路图.pdf（8页珍藏版）》请在收音机爱好者资料库上搜索。

1、 Document type: Created: Page: SERVICE BULLETIN (2011-02-01) Page 1 of 8 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF LAB.GRUPPEN AB AND TC Electronic A/S 2005 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN |. Technical Service Bulletin No. 21

2、Created by: Lab.gruppen AB Service Department Date: 2011-02-01 Reference no: CX models It is highly recommended to implement this service bulletin as preventative maintenance if the unit is serviced for another issue. Affected models Following models are affected by this technical service bulletin:

3、C20:8X, C10:8X, C10:4X & C5:4X Affected boards/modules Describe which boards/modules this technical issue affects. AICO4B08a-F01 or earlier. AICO4B08a-F02 or earlier. Symptom Amplifier may refuse to start up. If it starts up and there is no Audio on any channel. Solution AICO4B08x-FXX 1. Measure +18

4、V across C407 & - 18V across C405. 2. If +18V across C407 & - 18V across C405 is ok, then nothing is damage and follow service bulletin 21. 3. If zero, measure resistance between pin 2 & 3 at U403. If reading below 100 Ohm then U403 is broken and in need of replacement. 4. Measure resistance across

5、D422 and D423. If reading below 100 Ohm replace D422 & D423. AICO4B07x-Fxx or earlier. 1. Measure +18V across C407 & - 18V across C405. 2. If +18V across C407 & - 18V across C405 is ok, then nothing is damage and follow service bulletin 21. RadioFans.CN 收音机爱 好者资料库 Document type: Created: Page: SERVI

6、CE BULLETIN (2011-02-01) Page 2 of 8 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF LAB.GRUPPEN AB AND TC Electronic A/S 2005 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN |. If zero, measure resistance between pin 2 & 3 at U403. If reading belo

7、w 100 Ohm then U403 is broken and in need of replacement. Measure resistance across C407 and C405 if below 100 Ohm then there are several damaged integrated circuits. Note! When service bulletin 10/14 is not implemented can U403 cause damage to several integrated circuits. AICO boards may need to be

8、 replaced. Contact Lab.gruppen for spare parts. Service Log Information Write “Technical Service Bulletin no.21” in column “Repair Remedy” besides other normal repair information. Instruction Part No. Description Amount Info Pos 1N4004 Diode Power 1n4004 1 See instruction 470n200VX7R 10%5 Capacitor

9、Ceramic 470n 200V X7R 10% 5mm 1 See instruction 1. “New “components in Schematic. RadioFans.CN 收音机爱 好者资料库 Document type: Created: Page: SERVICE BULLETIN (2011-02-01) Page 3 of 8 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF LAB.GRUPPEN AB AND TC Electronic

10、 A/S 2005 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN |. 2. Remove the screw from the bottom and top cover. Remove the cover. 3. Remove screws from the side panels. RadioFans.CN 收音机爱 好者资料库 Document type: Created: Page: SERVICE BULLETIN (2011-02-01) Page 4 of 8 THIS DOCUMENT IS CONFIDEN

11、TIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF LAB.GRUPPEN AB AND TC Electronic A/S 2005 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN |. 4. Remove screws from the rear panels. 5. Form diode, cut legs and solder according to picture. Make sure that diode is close to pcb

12、 as possible. Document type: Created: Page: SERVICE BULLETIN (2011-02-01) Page 5 of 8 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF LAB.GRUPPEN AB AND TC Electronic A/S 2005 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN |. 6. Note! Please note

13、the direction of the diode. Incorrectly mounted major damage can occur. 7. Form capacitors legs according to picture. 8. Cut of legs according to picture. Document type: Created: Page: SERVICE BULLETIN (2011-02-01) Page 6 of 8 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITT

14、EN PERMISSION OF LAB.GRUPPEN AB AND TC Electronic A/S 2005 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN |. 9. Remove screws from rear panel and AICO pcb. 10. Fold gently AICO according to picture. Document type: Created: Page: SERVICE BULLETIN (2011-02-01) Page 7 of 8 THIS DOCUMENT IS C

15、ONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF LAB.GRUPPEN AB AND TC Electronic A/S 2005 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN |. 11. AICO4B overview. Capacitor should be placed on top of Q401. Document type: Created: Page: SERVICE BULLETIN (2011-02-01) P

16、age 8 of 8 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF LAB.GRUPPEN AB AND TC Electronic A/S 2005 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN |. 12. Solder capacitor according to picture. 13. Assemble all parts and fasten screw. Serial numbers 14. From serial number 00163154 and below could be affected. History Date Created By Status Bulletin no. Comment 20110201 LP