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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
CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM
Safety precautions The Components identified by the symbol are critical for safety. For continued safety, replace safety critical components only with manufacturer's recommended parts. 1. Units of components on the schematic diagram Unless otherwise specified. 1) All resistance values are in ohm. 1/6 W, 1/8 W (refer to parts list). Chip resistors are 1/16 W. K: K� (1000�), M: M� (1000K�) 2) All capacitance values are in µF, (P: PF). 3) All inductance values are in µH, (m: mH). 4) All diodes are 1SS133, MA165 or 1N4148M (refer to parts list). Note: The Parts Number, value and rated voltage etc. in the Schematic Diagram are for references only. When replacing the parts, refer to the Parts List. 2. Indications of control voltage AUX : Active at high. AUX or AUX(L) : Active at low.
Playback and recording signal path Recording signal path (including E-E signal path) Capstan servo path
4. Voltage measurement 1) Regulator (DC/DC CONV) circuits REC : Colour bar signal. PB : Alignment tape (Colour bar). � : Unmeasurable or unnecessary to measure. 2) Indication on schematic diagram Voltage Indications for REC and PB mode on the schematic diagram are as shown below.
1 REC mode 2.5 (5.0) PB mode 1.8
2
3
PB and REC modes (Voltage of PB and REC modes are the same)
Note: If the voltages are not indicated on the schematic diagram, refer to the voltage charts. 5. Signal path Symbols The arrows indicate the signal path as follows. NOTE : The arrow is DVC unique object.
Playback signal path
3. Interpreting Connector indications
1 2 3 1 2 3
Removable connector
(Example)
Drum servo path
Wire soldered directly on board
R-Y Playback R-Y signal path Y Recording Y signal path
1 2 3 1 2 3 4
Non-removable Board connector
6. Indication of the parts for adjustments The parts for the adjustments are surrounded with the circle as shown below.
Board to Board
Connected pattern on board The arrows indicate signal path
Note: For the destination of each signal and further line connections that are cut off from the diagram, refer to "BOARD INTERCONNECTIONS" 7. Indication of the parts not mounted on the circuit board �OPEN� is indicated by the parts not mounted on the circuit board. R216 OPEN
2-1
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