A great copy of the manual, and the only one I could find anywhere on the net! The circuit diagrams are easily readable, all component values marked and easy to see. A highly appreciated download!
The TEAC A-1500's Service Manual was instrumental in reviving this classic reel-to-reel. Not only does it have the schematics, exploded parts diagram and parts list, it also provided mechanical adjustment information that approximate factory default settings.
Text excerpt from page 54 (click to view)
3-2. Switch Settings on the CPU-246 Board and LEDs Description
Other areas of the LED These LEDs indicate the operation stasus of the SUB CPU and the memory. D0 : Lights : Flash memory (IC136 on the CPU-246 board) of the SUB CPU is damaged. Lights off : Flash memory (IC136 on the CPU-246 board) of the SUB CPU is normal. D1 : Lights : Flash memory (IC136 on the CPU-246 board) of the SUB CPU is empty. Lights off : Flash memory (IC136 on the CPU-246 board) of the SUB CPU is normal. D2 : Lights :
The ROM (IC138 on the CPU-246 board), RAM (IC137 on the CPU-246 board) or dual port RAMs (IC134 or IC135 on the CPU-246 board) of the SUB CPU is abnormal. Light off : The ROM (IC138 on the CPU-246 board), RAM (IC137 on the CPU-246 board) and dual port RAMs (IC134 or IC135 on the CPU-246 board) of the SUB CPU are normal. D3 : This LED lights when the system is running in SUB CPU flash memory access inhibit mode due to the S5 switch setting on the CPU-246 board. D102, D112 (M12) : These LEDs indicate the result of checking the operating condition of the main CPU. D295 (Green color) (R9) : POWER (+5V) Lights when the power is supplied to the CPU-246 board. D8 (Green color) (R9) : POWER (+12V) Lights when the power is supplied to the CPU-246 board.
