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Great manual, great price. Has a few of the basic operating instructions that most service manuals leave out. Complete instructions for disassembling board by board, safety precautions, schematics, complete parts list.
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I am very pleased with the service manual for my RT-909. This was an easy purchase and great procuct, and much cheaper than other venues i had looked at. This web site is now listed in my favorites list. KEEP UP THE GOOD WORK. THANKS. J. BROWN
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A very well written and easy to understand manual.
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There was no problem at all.After paying i had to wait only a few hours,than i could
download the manual in best pdf-quality.
Thank You !
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I found this service manual to be complete in every detail except for troubleshooting charts. It would be helpful if it had a set of troubleshooting charts; however it is a very good manual otherwise and for the price it is very well worth it.
TROUBLESHOOTING
2. SYSTEM CIRCUIT
A. LED DISPLAY
No LED display.
Is 5V obtained at IC701 pin # 9, 25? YES
NO Check L703, pin#6 of PJ701
NO Oscillation at IC701 pin #1? Exchange IC701.
YES NO
Is there KEY/SEG signal?
Check PCB
YES NO KEY output at PORT of IC701? Check IC 701 pin #6, 7, 8
YES NO SEG output at PORT of IC701? Check IC 701 pin # 10-12,14,15
Exchange IC701.
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