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Hard to find service manual describing the PLL circuit of the AKAI AP-306.
Thanks to have it available.
;
Gut, sehr gut! It helps me much! I couldn't find this schema nowhere. Good quality
12 Block and Schematic Diagrams
12.1. Schematic Diagram Notes
Important Safety Notice
Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufacture's specified parts.
Notes: 1. Resistor All resistors are cabon 1/4W resistor, unless marked as follows: Unit of resistance is OHM [W] (K=1,000, M=1,000,000). : Nonflammable : Solid : Wire Wound 2. Capacitor All capacitors are ceramic 50V capacitor, unless marked as follows: Unit of capacitance is mF, unless otherwise noted. : Temperature Compensation : Polyester NP M
m
: Metal Oxide : Metal Film : Fuse:
: Electrolytic : Bipolar : Dipped Tantalum : Z-Type
Remarks: 1. The Power Circuit contains a circuit area which uses a separate power supply to isolate the earth connection. The circuit is defined by HOT and COLD indications in the schematic diagram. Take the follwing precautions. All circuits, except the Power Circuit, are cold. Precautions a. Do not touch the hot part or the hot and cold parts at the same time or you may be shocked. b. Do not short- circuit the hot and cold circuits or a fuse may blow and parts may break. c. Do not connect an instrument, such as an oscilloscope, to the hot and cold circuits simultaneously or a fuse may blow. Connect the earth of instruments to the earth connection of the circuit being measured. d. Make sure to disconnect the power plug before removing the chassis. 2. Following diodes are interchangeable. MA150- MA162 (Replacement part)
: Metalized Polyester : Polypropylene
T Z
3. Coil Unit of inductance is mF, unless otherwise noted. 4. Test Point : Test Point position 5. Earth Symbol : Chassis Earth (Cold) : Line Earth (Hot) 6. Voltage Measurement Voltage is measured by a DC voltmeter. Conditions of the measurement are the following: Power Source ................................................... 50/60Hz Receiving Signal ............................................... Colour Bar signal (RF) All customer's controls ...................................... Maximum positions 7. Number in red circle indicates waveform nember. (See waveform pattern table.) 8. When arrow mark ( ) is found, connection is easily found from the direction of arrow 9. Indicates the major signal flow. : Video Audio 10. This schematic diagram is the latest at the time of printing and subject to change without notice.
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