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let's say first that i do not need to have a credit for my opinion, i am a retired sparkie and i voluteerd to fix an electronic device for a local "Youthgroup",as no diagram was present i checked the "net" and gambled on this site and paying some fee via PayPall, i was gladly surprised that the manual arrived as was stated, GOOD SHOW, and best wishes, John
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I had been looking for a Manual for my CS2150 for quite a while -- in fact I had just about given up. I saw this site and decided to download the Manual. When I Received it by Email I was really pleased with what I got, with the result that My Kenwood 'Scope is now 100% repaired and working well. As an AV Serviceman, you need a good 'scope, and thanks to this site, and the Service Manual, I have been able to repair it. The Manual was a copy of the Factory Original and the copy was very clear, especially in the area of the Circuit Schematics, where You really need to be sure of what You are looking at.
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I recently purchased a manual for a Samsung DLP tv to help with a trouble shooting problem I was having. Every tv repair shop wanted close to $400.00 for the fix, but after I found Owner-Manuals.com I hit pay dirt. The manual they had for me to purchase and download was a complete service manual for the exact tv I needed. It was complete with wiring diagrams, schematics, and even part numbers. If your the fix it yourself type I highly recommend trying to find any manual here before paying someone else to fix whatever problem your having.
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Once again, excellent price and manual delivered in a timely manner and as advertised!
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Outstanding quality manual. This is the exact documentation I needed to service my AKAI GX-210D. This is a PERFECT COPY of the service manual for my machine. Outstanding service. Thank-you!
SD-AT100H
TO CHECK AND CANCEL PROTECT CIRCUIT DETECTION LINE
1. After power supply, the microcomputer (IC301) built in this model consecutively monitors the following errors. If any error occurs, 'Er_AP00' is displayed and all power supply except for the one to drive the microcomputer is interrupted. Abnormal output voltage drop of each regulator (below approx. 3 V) Excessive output offset of 1-bit amplifier (over approx. 2 V of DC potential) Excessive main supply current of 1-bit amplifier (over DC approx. 5.5 A) Abnormalities of cooling fan motor and its driving circuit (stop, etc.)
1 2 3 4
2. Criteria for judging errors of built-in microcomputer and checking/cancelling detection line Condition: The voltage of microcomputer pin 91 (PROTECT) lowering below 2.0 V is regarded as an error. (In the demonstration mode to stop cooling fan, the voltage of 1.2 V is regarded as an error.) Checking/Cancelling Caution: When interrupting the PROTECT detection line, the microcomputer does not operate protectively. In case of an error caused by output short-circuit of each regulator, components and board on the spot may be burnt. Do not interrupt the PROTECT detection line of the microcomputer, if any cause other than the above mentioned is not identified. (For approx. 0.5 seconds after error detection, power is supplied; power supply can be checked with an oscilloscope, etc. As leading and trailing edges of the voltage are so steep that the power supply cannot be checked by the tester.)
1 Abnormal output voltage drop of each regulator 2 Excessive output offset of 1-bit amplifier
Connect the measuring apparatus (oscilloscope, etc.) to the stabilized output of the regulator to turn on the unit power switch. If the stabilized output is far smaller (below approx. 3 V) than that shown in the circuit diagram, the regulator and the circuit to be supplied with the power may be defective.
After disconnecting the CNP705, CNP706 and CNP707 (speaker output connector of 1-bit amplifier), turn on the unit power for the normal operation. (No sound is heard from the speaker.) * After repairing, adjust the output offset voltage of 1-bit amplifier as shown on page 21. If the protective operation is observed even after disconnecting the CNP705, CNP706 and CNP707, circuits Q721 to 732 (DC voltage detection of speaker output) may be defective.
3 Excessive main supply current of 1-bit amplifier
After disconnecting the CNPE01, CNPE02 and CNPE03 (main power source connector of 1-bit amplifier), turn on the unit power for the normal operation. (No sound is heard from the speaker.) * After repairing, adjust the output offset voltage of 1-bit amplifier as shown in page 21. If the protective operation is observed even after disconnecting the CNPE01, CNPE02 and CNPE03, the circuit of Q712 to Q717 and IC701 (supply current detection circuit) may be defective.
4 Abnormalities of cooling fan motor and its driving circuit (stop, etc.)
Turn on the unit to visually inspect the cooling fan motor till the protective operation starts. * If the fan is rotating forcefully; Q520, contact of the CNP505 (connector for fan motor), or fan may be defective. (CNP505 pin 3 potential during normal fan operation is approx. 0 V.) * When the fan is not rotating or seems to be stopping. If it is checked that the CNP505 (connector for fan motor) is not defective and it is also checked by oscilloscope, etc that voltage of pin 1 (red line of fan) is approx. 6 V, the fan may be defective. When the voltage of the CNP505 pin (1) is far lower than 6 V, and base voltage of Q521 is almost the same as that shown in the circuit diagram, the fan or the circuit consisting of P501and Q523 may be defective. When the base voltage of Q523 is 0 V or extremely lower than the value shown in the circuit diagram (3.5 V), the system control terminal of Q522 may be defective.
� 35 �
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