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CIRCUIT CHANGE
DATE
Improve Power Dissipation in Standby
1) D403 changed from 8.2V to 4.7V
2) Add D409 across IC402 pin1 and pin3, anode connect to pin3
3) D404 changed from 1N4007 to 1N5819, Reconnect D404
cathode from IC402 pin1 to pin3
4) R521 changed from 130ohms to 270ohms
5) Add another 1N4007(D550) series in IC502 pin8 and D501 anode,
D550's anode connect to D501's anode
6) C517 changed from 1000uF/6.3V to 1000uF/10V, the purpose is SMPS
ripple bigger than liner power supply, increase reliability
Dec. 03. 08
Improve the Q147 Power Dissipation
1) R186 changed from 10K to 22K
2) R187 changed from 510ohms to 2.2K
Dec. 10. 08
Improve fine adjustment of the volume by remote
1) D551 added
2) Change the interval delay time from 200ms to 100ms in software V1.5
Feb. 09. 09
Oct. 2009
VERSION HISTORY
Change Top Cover & Chassis for better fit
from serial number: H9XC375BEEG04120
Change to 0.5W version and add +8V for MDC Oct. 2010
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2
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Содержание 375BEE C
Страница 6: ...6 ALIGNMENT PROCEDURE...
Страница 7: ...7 ALIGNMENT PROCEDURE...
Страница 17: ...P801A 3PIN2 54 A170B P801A 3PIN2 54 A170B 2 3 1 J801 PHONE JACK J801 PHONE JACK 17 SCHEMATICS DIAGRAM...
Страница 25: ...C375 RS232 Board VM1 0 Oct 28 2008 C375 RS232 BOARD 6 1 J701 R701 5 9 P701A 25 PCB LAYOUT...
Страница 26: ...L J801 R C375BEE HEADPHONE BOARD P801A 26 PCB LAYOUT...