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I needed a service manual as the display on my oscilloscope was very dim. I thought I'd give owner-manuals.com a try, as they advertised a huge number of manuals. Sure enough they had one listed. I bought it hoping it would be useful... actually, I bought it hoping it would be readable! I've had manuals from online sources in the past, and been very disappointed. Not this time! An excellent manual, complete, and very readable. Using it I fixed my 'scope, and as such the manual was an investment that paid off manyfold. Do I have any complaints? One very minor one - The circuit diagrams could have been scanned at a higher resolution, as some of the details were a little difficult to make out - not impossible, just not as easy as my old eyes would like! Overall, I'm very satisfied with my manual, and I will certainly be using this company again. Well done.
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I Have looked for this manual for quiet a while now, I have finally found it here. I believe this is the only place they have them in a very nice scan, pages are very clear to read, some of the pages are a bit tilted but overall it is great to have this manual available for purchase. Thanks
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This is quiet a rare manual, I Have looked for this manual for quiet a while now, I have finally found it here. I believe this is the only place they have them in a very nice scan, Excellent guide: very clear, enabling us to print readable diagram overall it is great to have this manual available for purchase. This is a complete service manual no pages are missing. Thanks
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This SM is quiet scarce and hard to find it is an excellent Service manual, very clear to read and to print schematics and diagrams, Hi quality, Complete manual with no pages missing. I am very pleased with the manual and the fast service I have received. Great place to shop.
Good luck finding you manual...
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Quick delivery, the document was usefull, although the copy was i little bit unclear in the details.
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3 FAN detection circuit
5 IC81 abnormal temperature detection circuit
VD+5 VPF+15 IC81 NJM7805FA TH111 NCP18WF104J03RB to XPROTECT
C
6CH AMP
VD+5
C
6CH AMP
A
to XPROTECT (µ-com)
R108 27k
C2 B2 E C
R3654 1.8k D3658 UDZS7.5B
B
A A
Q3652 DTA124TK R3657 33(1/4W) FAN+ D3655 1SS133 FAN� D3651-D3654 1SS133�4 R3656 22k V-12F R111 1k
R113 220
Q111 2SC4081
Q3651_2/2 RN1901
E2
+
R3658 2.2k
R112 1k
Q3651_1/2 C3652 D3657 RN1901 47/50 1SS355 R3655 8.2k Q3654 2SD2144S
The voltage at Point A becomes the divided voltage of TH111 and R111//R112 (combined resistance of parallel-connected 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
If no fan is connected between FAN+ and FAN-, or when the fan cannot rotate because of a foreign object caught in the blades, current will not flow to R3657, and Q3652 and Q3651-1/2 (E, C, B) are turned off. Then Q3651-2/2 (E2, B2, C2) is turned on, and the level of XPROTECT becomes low. � The microcomputer detects the XPROTECT level and shuts the power to the unit off. When FAN+ and FAN- are short-circuited, the electric potential at Point A becomes higher than GND level by the addition of the values at D3656 and D3657. As this value is lower than that at D3658, Q3651 (E, C, B) is turned off, Q3651 (E2, B2, C2) is turned on, and the level of XPROTECT becomes low.
C
4 DC detection circuit of SP terminal
D
POWER Assy
C
VD+5
6CH AMP
+5V R3357 (R3457) 18k Q3605 R3358 (R3458) 18k + R3603 10k C3602 100/10 Q3604 Q3607 Q3606
E B C
R108 27k
D
XPROTECT
Front L ch (SW, SL) Front R ch (C, SR)
� In Normal mode, both Q3605 and Q3604 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 Q3605 becomes higher than that at the operation point, Q3606 (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 Q3604 is turned on, and XPROTECT is activated.
E
F
S-DV900SW
5 6 7 8
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