I searched EVERYWHERE looking for the manual/s on this "extinct" amp. Owner-Manuals.com made it available and for nearly nothing. Thanx to them, I can decipher the unknown cables and sort them out. Thanx, Owner-Manuals.com!!
Great manual...really saved me. The only problem is that I thought I would be able to download it directly when I paid for it but never received the download instructions until the next morning. The board trace pages were somewhat light also: really need to turn up the contrast on the printer before printing them. The schematic page was great; very clear! Well worth the money.
I've been in the electronic business for a long time. I used to buy Sam's Photofact for my needs which intailed having to go to the store and paying about $20 for a package of 3 different units so I was forced to buy more than I needed just to get one.
Owner manual is just at your keyboard and the information is almost instantansouly and the cost is very reasonable. Easy to print out if needed or simply read off of the screen. The larger the screen the better for obvious reasons.
Text excerpt from page 41 (click to view)
NO.10 FLOW CHART NO.11
The cassette tape fails to eject. No power is turned on.
Does the capstan motor start when NO Check IC701. the EJECT button is pressed? See FLOW CHART NO.12. pin(4) of IC701 change from "L" to "H" level?
YES NO Does the take-up turn when disk reel drive unit. Does base of Q951 change from NO Check IC701 and all the way up thru
NO Does power control(H) signal at
YES
the capstan motor is running? about 5.0V 4.5V? to Q951. Check take-up reel sensor and all the Is 5V sent out the collector of NO Are pulses applied at pin(2) of IC701 Check Q951 and the AT 5V line. Q951? when the take-up reel disk is turning?
YES
YES
way up thru to IC701.
YES
NO
Check pin(90) of IC701. soldering. pin(12) of IC706 when a reel pules
Check peripheral circuits for poor Is a "H"(about 1.7V) level applied at
has been inputted?
YES
Is the voltage about 10V sent out of NO Check IC706. pin(15) of IC706?
YES FLOW CHART NO.12 NO Is specified voltage applied at Check between IC706 and all the
41
NO
motor terminal? way up thru to the loading motor.
The capstan motor fails to run.
YES
Does motor run? Replace loading motor. Is the voltage more than about 2.6V NO
DC given out pin(29) of IC701.
YES
Check IC701.
YES
Replace cassette cam, gear, etc. NO Is the supply voltage of 5V feed to pin(8) of AC connector?
YES NO YES
Check PC 5V line.
Check between the AC connector Is the voltage more than 2.6V DC and all the way up thru to pin(29) sent in pin(4) of AC connector? of IC701. Check between the pin(92) of IC701 NO Is the voltage at pin(3) of AC and all the way up thru to pin(3) of connector 1.6~2.7V? AC connector.
YES NO Check AT 12V line and motor voltage
selector circuit. (Q955~Q956). Is the supply voltage of 12V feed to pin(5) of AC connector? YES Replace capstan motor.
