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Good product and very helpfull to repair. Many thanks.
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Very good product. Best service manual. Many thanks
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I am only search for 5 Minute, by it in 5 Minutes to and get ist in few ours! Best i found in the Internet and my Amplifer is repaired as well! Thank you
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Readable text and good copy. Very much needed if you wish to do some repairs on this fine old unit.
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Fint forløb med levering af manualen. Kvaliteten af skanningen betegnes som middel
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4 When DC is generated at the output because of a failure in the AMP system, etc.
5 When abnormally high temperature is detected by the thermistor
5 -1 IC81 abnormal temperature detection circuit
VD+5 IC81 NJM7805FA TH111 NCP18WF104J03RB
A
J
R3605 (R3625) (R3615) 27k Q3637 R3606 (R3626) (R3616) 27k + R3638 10k C3632 470/6.3
POWER Assy
D
VD+5
6CH AMP Assy
D
+5V Q3632
E B C
6CH AMP Assy
to XPROTECT
R108 27k
Front L ch (SW, SL) Front R ch (C, SR)
A
XPROTECT R111 1k
R113 220 R112 1k
Q111 2SC4081
Q3638
Q3633
The voltage at Point A becomes the divided voltage of TH111 and R111//R112 (combined resistance of parallel-connected � In Normal mode, both Q3637 and Q3638 are off. (1) When positive (+) DC voltage is generated at the SP terminal When positive (+) DC voltage is generated at the L or R channel, and VB of Q3637 becomes higher than that at the operation point, Q3632 (E, C, B) is turned on, and the level of XPROTECT becomes low. � The microcomputer detects the XPROTECT level and shuts the power to the unit off. (2) When negative (-) DC voltage was generated at the SP terminal Q3638 is turned on, and XPROTECT is activated. resistors R111 and R112.) In Normal mode, the resistance at TH111 is much higher than R111//R112, and Q111 is off. (Note that the resistance at TH111 becomes lower as the temperature increases.) If the solder temperature at IC81 increases abnormally, the temperature at TH111 (thermistor) mounted closest to the land of IC81 increases accordingly, and the resistance at TH111 decreases. When the temperature at TH111 reaches 90-110_C (varying according to conditions,) the voltage at Point (A) becomes high enough to turn Q111 on, and the level of the XPROTECT line becomes low. The microcomputer detects the XPROTECT level and shuts the power to the unit off.
B
C
D
E
F
XV-DV430
1 2 3 4
111
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