AP-206 AP-206C AP-306 AP-306C Service Manual
Contents
1. e R5 27M war CIO ol R6 27 R9 39K es NE9OI WHT BE RII 8 2K oN TRI 28 2229 0 On 2507 CSA AAL 100mA 125V UK CEE 100 mAT uit 3 POWER SUPPLY BOARD AP 2641 U T to 240V 50 60Hz U T Fi sw 3 220 240V 110 120V POWER TRANS 9 R2 3 0 047 630 K e 34 e RI 1 20 47 AN MARK X INDICATES MODEL AP 206 C ONLY WARNING AINDICATES SAFETY CRITICAL COMPONENTS FOR CONTINUED SAFETY REPLACE SAFETY CRITICAL COMPONENTS ONLY WITH MANUFACTURER S RECOMMENDED PARTS AVERTISSEMENT AIL INDIOU LES CONFOSANTS CRITIQUES DE SURETE POUR MAINTENIR it DEGRE DE SECURITE DE L APPAREIL NE REMPLACER LES CONPOSAN DONT LE FONCTIONNEMENT EST CRITIQUE POUR LA SECURITE QUE PAR DES PIECES RECOMMANDEES PAR LE FABRICANT 4 POWER SUPPLY P C BOARD AP 2641 AAL CSA 120V 60 Hz CSA AAL POWER TRANS 901 X NE9OI WHT RI 1 2 4 7 CI 0 01 125 2 5 MARK X INDICATES MODEL AP 206 C ONLY WARNING AINDICATES SAFETY CRITICAL COMPONENTS FOR CONTINUED SAFETY REPLACE SAFETY CRITICAL COMPONENTS ONLY WITH MANUFACTURER S RECOMMENDED PARTS AVERTISSEMENT INDIQU LES COMPOSANTS CRITIQUES DE SURETE POUR MAINTENIR LE DEGR2. 7 ical p Rat vm eter eA T qnt Dh DON
3. PARTS LIST A 0 a MODEL 306 NS ALSO APPRICABLE TO BLACK MODEL 206 AKAI DIRECT DRIVE TURNTABLE AND DIRECT DRIVE QUARTZ LOCK TURNTABLE MODEL 206 MODEL AP 3 6 ALSO APPLICABLE TO BLACK MODEL SECTION 1 SERVICE MANUAL T ES SECTION 2 PARIS LIST vedas fee wate we 31 SECTION 3 SCHEMATIC DIAGRAM 48 306 SECTION 1 SERVICE MANUAL TABLE OF CONTENTS TECHNICAL DATA sonoros ftm een 4 PRIS wv Gene Ga wean giv 4 MODEL AP SUGIC o nen ne ade 5 Il DISMANTLING OF 0 6 HE CON RRODS 7 1 MODERN co Suen oP pr suh ETT Gee I pi 7 2 MODEL 8 IV PRINCIPAL PARTS LOCATION 9 ESO SEES S dee ne ek nh 9 9 MODELAT 10 v BLOCEDIAGRAM rra 11 MODEL AP mma ore nua wl Pie e Tl 11 2 MODET c nen 11 VL CIRCUIT OPERATION ooo 12 LI gee M E E 12 SL GORVO CIRCUIT 12 ROBO LIGHT CIRCUIT da 13 MECHANICAL ADJUSTMENT 14 1 STYLUS PRESSURE ADJUSTMENT 14 2 OVER HANG ADJUSEMENT 15 3 SLEEVE PO
4. Fig 21 75V gt Wes g PULSE PULSE OV Fig 22 2 Adjusting the Quartz Locked Phase Angle VR1 a Connect an oscilloscope to TP 2 and pin 5 ground b Release the Speed selector to the 33 1 3 position c Depress the Quartz Lock button in ON d Move the tone arm to turn power on e Adjust VR1 until the width of the upward pulse above 2 to 4V is 22 2 msec when the Strobe markings is seen standing still as Fig 21 oscilloscope DC Mode CAUTION The upward pulse around 7 5V shown above may change to downward pulse OV below 2 to 4V with turned as Fig 22 Be careful not to measure the width of the downward pulse It is checked in a simple way that the upward pulse will change to downward pulse by loading on the platter by hand IX CLASSIFICATION OF VARIOUS BOARDS 1 BOARD TITLE AND IDENTIFICATION NUMBER INT APSO6I REIT 21 eG Sw902 15 45 33 1 3 206 1068A 3601 O MOTOR BLOCK 901 DDM 33 0622852 295 R90 IOK 90 20KB QUARTZ LOCK QUARTZ LOCK PITCH lt lt 2 2 VR2 200KB 200KB 5 3 C22 100 25 o o O a 15 9 No 9o o 41 35 NA a a a Is AW 9 99 c o NW eNO ANO ANS j c 3 gt 3 3 w
5. N o AA Dp gt gt 7 6 19 1 2 3 383 8 v 2 d Ca 5 1 QUU A10 064982 981 0 996VSz S EYL 0 9222252 281 996752 9822252 823 6181252 93 O ORG C24 ORG POWER TRANS 470 25 oF BLK 4 2 o La p gt gt n o gt 3 o Tr9T dV od qa 1 Sdavod 24 SNOIAVA NOLLISOdWOD 2 PLL BOARD AP 3601 Model AP 306 C only Sw902 45 33 V3 WHT BLU 2642 6 xw BLU WHT 5 903 BLK 2642 a ECB 2 en 2502229 WE 8 O Sema ae O R2 3 3K O 0 gt gt gt x o o 51 191111 8 218 910 11 12 i3 42 I976543213 gt 5 gt 63 24212 124 ur SI VCI 15 RI 27M gt n gt 4 42368MHZ X ot 1542 sr 210 51 8 9 10 1112 13 ijo ert am Ships see ct aem 95453 3 52 103 TC5080P C2 50 IC4 TC4040BP Go ST Sw 9 51 172927278724 2 105 TC508IP gt SS 51 10 121314 15 160 1C6 TC40028P TAE f 1 o8 9 10 I 1213 2 24 22 22 9ir 6 5 4 3 2 1 001 Pe xuillid tt o 2 2 4 2 gt R4 IM gt 9 gt PSLT DE qwe 9 IS le LO Mo 5 4 lt i 7 l 7654 32 ijo eig 76543219 les ee 5 5 22212424242 5 100 10 67 220K mom m m m TP 2 ami ce
6. E 7 8 grams AP 206C only Model AP 206 does not include cartridge Induced magnet type 6 4 grams 25 Hz to 30 000 Hz 5 mV More than 23 dB 2 grams 8 x 10 cm dyn vertical 8 x 10 cm dyn horizontal 120V 60 Hz for U S A and Canada 220V 50 Hz for European countries except U K 240V 50 Hz for U K and Australia 110 to 120V 220 to 240V switchable 50 60 Hz for other countries 440 W x 158 H x 350 D mm 7 4 kg For improvement purposes specifications and design are subject to change without notice 2 MODEL AP 306 C TURNTABLE DRIVE SYSTEM MOTOR SPEED amp PITCH CONTROL SPEED ACCURACY WOW AND FLUTTER RUMBLE MOMENT OF INTERIA TONE ARM ARM LENGTH STYLUS PRESSURE ADJUSTMENT RANGE APPLICABLE CARTRIDGE WEIGHT ARM LIFTER OVERHANG OFFSET ANGLE HORIZONTAL TRACKING ERROR ANGLE SHELL WEIGHT CARTRIDGE CARTRIDGE WEIGHT FREQUENCY RESPONSE OUTPUT VOLTAGE CHANNEL SEPARATION OPTIMAL STYLUS PRESSURE DYNAMIC COMPLIANCE POWER REQUIREMENTS DIMENSIONS WEIGHT STANDARD ACCESSORIES 45 Adaptere Sure Minus A E 314 mm aluminum alloy die cast Quartz Lock Direct Drive Auto Return DC Servo Motor 33 1 3 45 rpm 2 5 1 000 Hz 0 08 0 035 DIN 0 025 JIS Better than 49 dB DIN A 70 dB DIN B 230 kg cm Static balanced type with Anti skating Adjuster 220 mm 0 to 3 grams 4 to 12 grams Oil damped 15 mm 22 30 2 7 8 gra
7. E DE SECURITE DE L APPAREIL NE REMPLACER LES CONPOSANTS DONT LE FONCTIONNEMENT EST CRITIQUE POUR LA SECURITE QUE PAR DES PIECES RECOMMANDEES PAR LE FABRICANT 24 5 POWER SUPPLY BOARD AP 2641 UK CEE UK CEE POWER TRANS T90I WHT NE 901 MARK X INDICATES MODEL AP 206 C ONLY WARNING AINDICATES SAFETY CRITICAL COMPONENTS FOR CONTINUED SAFETY REPLACE SAFETY CRITICAL COMPONENTS ONLY WITH MANUFACTURER S RECOMMENDED PARTS e AVERTISSEMENT AIL INDIQU LES COMPOSANTS CRITIQUES DE SURETE POUR MAINTENIR LE DEGRE DE SECURITE DE L APPAREIL NE REMPLACER LES CONPOSANTS DONT LE FONCTIONNEMENT EST CRITIQUE POUR LA SECURITE QUE PAR DES PIECES RECOMMANDEES PAR LE FABRICANT 25 26 21 28 29 30 1 M S AN Wi S TT y o gr y 1 4 77 7 Mw 4 5 Let 44 NS e 3 2 r NA Y EA 7 4 En lt j 7 7 2 A NN NON 7 47 E SAY MEZ 2 ME Zn AAS y E wa wat 1 X 4 RE y Y 2 22 ha nr 14 j LAS A peo oe Nt SEE EAN DRS margen 72 1 y 4 a ihe 2 4 gt 4 14 NN 4 A T ome iios sisi one N 7 222 7 he TJ 43 an ts f R biti AST ress AME 2
8. FTER LEVER w to Lower Y to Lift 2 MODEL AP 306 C NOTE AP 306 is not equipped with a cartridge D Pe 2 O HINGE RUBBER MAT SPINDLE TURNTABLE PLATTER STROBE MARKINGS BUILT IN STROBE LIGHT SPEED SELECTOR SWITCH QUARTZ LOCK SWITCH PITCH CONTROL 45 rpm ADAPTER HOLDER HINGE 12 13 14 15 16 17 18 19 20 ZE 22 MAIN WEIGHT STYLUS PRESSURE SCALE RING ANTI SKATING ADJUSTER TONE ARM LIFTER TONE ARM REST TONE ARM TONE ARM LIFTER LEVER LOCKING NUT START CUT LEVER CARTRIDGE SHELL FINGER LEVER CARTRIDGE SHELL IV PRINCIPAL PARTS LOCATION Vu 1 MODEL AP 206 C AUTO CLUTCH A AUTO CLUTCH B REJECT LEVER BUILT IN STROBE LIGHT 45 33rpm SPEED SELECTOR MICRO SWITCH 901 RELAY BOARD AP 2652 PU PLATE A PU PLATE B E a SEESAW LEVER AUTO LEVER LIFTER SPRING MAIN WEIGHT STYLUS PRESSURE SCALE RING ANTI SKATING ADJUSTER TONE ARM LIFTER TONE ARM TONE ARM REST TONE ARM LIFTER LEVER START CUT LEVER CARTRIDGE SHELL Fig 3 AP 206 C Top View with Dust Cover Removed POWER SUPPLY P C BOARD AP 2641 POWER TRANS T901 D D BOARD 2642 MOTOR BLOCK DDM 33 NEON LAMP PC BOARD AP 2653 Fig 4 AP 206 C Bottom View with Bottom Case Removed 2 MODEL AP 306 C MAIN WEIGHT STYLUS PRESSURE SCALE RING ANTI SKATING ADJUSTER TONE ARM LIFTER AUTO CL
9. R22 150 VR2 200KB 95 M 4 9 542 d a R6 IK a RIO 82K 151588 R2I 470 R23 150 10 3V 103V Guise Les 76V 4 SSL 0 8V 4 76V A R9 22K R8 270 R3447K 5 529047 2 ou l Slo ol dd NI 97 3 jeoev C20 0 047 NV a RS 470 q re M Bek ite bou 052 100 R42 56 vas clo 16 0 047 CI9 0 047 ee MRES 22 25 M 20 8 5 20KB rs VR6 300KB 3 be pr e oo R28 390K R33 270K c5 001 38V El AA LI ota gis 2 gt R40 470 R3 IK C8 0 15 T A dl d TA 4 RA T RI2 82K 047 25 26 R38 470 R4 10K c2 0022 76 1 1 13 ait TIT 87x al y MR TIOImo wri SEN RI333K 1469 LE R39 470 gm 2 5 VRI2KB 2 330K 4 dm Zev 22K 7 R2433K 2 27 98 R3227K R29 3 3K m 2 ai 210 Milo o5 om m 1a ED gt R RI6 56K 2 CI5 100 10 14 100 10 wi Sir 10000 100 10 625 5 ci 100 10 SE 6 191588 fui 5g Fey De oe 470 25 O oir 1 gt A RB 27k Rud O o RI5 39K R25 330K R26 27K N oo pOT n eo OOO gt BONA O bel WU PIT 9 mio Ir h 3 b gt AME CH m m 8 gt
10. SITION ADJUSTMENT 16 4 PU PLATE ADIUSTMENE mener AMD 16 5 LIFTER HEIGHT ADJUSTMENT 17 6 AUTOMATIC RETURN POSITION ADJUSTMENT 17 ELECTRICAL ADJUSTMENT 18 221 DIRECT DRIVE P C BOARD ADJUSTMENT 18 2 PLL P C BOARD ADJUSTMENT 19 IV CLASSIFICATION OF VARIOUS BOARDS 21 1 P C BOARD TITLE AND IDENTIFICATION NUMBER 21 L TECHNICAL DATA 1 MODEL AP 206 C TURNTABLE DRIVE SYSTEM MOTOR SPEED amp PITCH CONTROL SPEED ACCURACY WOW AND FLUTTER RUMBLE TONE ARM ARM LENGTH STYLUS PRESSURE ADJUSTMENT RANGE APPLICABLE CARTRIDGE WEIGHT ARM LIFTER OVERHANG OFFSET ANGLE HORIZONTAL TRACKING ERROR ANGLE SHELL WEIGHT CARTRIDGE CARTRIDGE WEIGHT FREQUENCY RESPONSE OUTPUT VOLTAGE CHANNEL SEPARATION OPTIMAL STYLUS PRESSURE DYNAMIC COMPLIANCE POWER REQUIREMENTS DIMENSIONS WEIGHT STANDARD ACCESSORIES 45rpm Adunier 2 1 MIHUBGENGE 1 Operator 1 314 mm aluminum alloy die cast Direct drive Auto return DC Servo Motor 33 1 3 and 45 rpm 2 5 1 000 Hz 0 15 0 035 DIN 0 025 JIS Better than 49 dB DIN A 70 dB DIN B Static balanced type with Anti skating Adjuster 220 mm 0 to 3 grams 4 to 12 grams Oil damped 15 mm 22730
11. UTCH TONE ARM TONE ARM REST AUTO CLUTCH B REJECT LEVER TONE ARM LIFTER LEVER BUILT IN START CUT LEVER STROBE LIGHT SPEED SELECTOR CARTRIDGE SHELL SWITCH Fig 5 AP 306 C Top View with Dust Cover Removed MICRO SWITCH 5 901 POWER SUPPLY P C BOARD AP 2641 RELAY P C BOARD AP 2652 POWER TRANS T90O PU PLATE A PU PLATE B SEESAW LEVER AUTO LEVER D D P C BOARD LIFTER SPRING AP 2642 MOTOR BLOCK DDM 33 PLL P C BOARD AP 3601 NEON LANP P C BOARD AP 2643 Fig 6 AP 306 C Bottom View with Bottom Case Removed 10 BLOCK DIAGRAM 1 MODEL AP 206 C HOLE ELEMEN e ETE m O 33 1 3 f 20Hz HOLE 45 227 2 ELEMENT ac STANDARD amp VOLTAGE Nm 45 PITCH 33 3 PITCH CONTROL CONTROL WAVE CORREIPLIER 2f TN R42 B 45 33 1 3 SPEED SELECTOR Fig 7 2 MODEL AP 306 C STROBE CIRCUIT 4 LPF QUATZ LOCK 8 4 42368MHz sc COUNT DOWN COUNT DOWN a SCHMITT TRIGGER R90I PITCH CONTROL 33 1 3 f 20Hz 45 f 27Hz HOLE ELEMEN awe Er gt COMPARATOR BAFFER 11 VI CIRCUIT OPERATION 1 12 NOR GENERAL The AP 206 C has a D D Direct Drive P C Board AP 2642 that contains a FG Frequency Generator the signal output of which controls the motor The AP 306 C has a PLL Phase L
12. ang adjustment Bring the tone arm to the center of the turntable Adjust the car tridge position in the cartridge shall so that the stylus position is even with the outside groove ring The cartridge position is adjustable by resetting the screws on the cartridge shell Fig 11 ES MICRO SWITCH SW90I I PLATE METAL SEESAW LEVER AUTO LEVER gt RETURN Fig 12 ah 3 SLEEVE POSITION ADJUSTMENT Refer to Fig 13 The sleeve position adjusts antiskating feature 1 Put the tone arm in the stop state or on the arm rest 2 Set the sleeve located between the PU Plate and the chassis to approximately 45 position as LEVER _ SCREW shown in Fig 13 en ee 4 PU PLATE ADJUSTMENT Refer to Fig 12 p 1 Put the tone arm in the stop state 2 Loosen the screws i 3 Adjust the PU plate A so that it may actuate the be Tm microswitch to turn on or off properly 4 Tighten the screws b and c 5 Temporarily set the screw a in a half screwed osition Fig 13 2 TONE ARM TONE ARM LIFTER ABOUT 8mm STYLUS Fig 14 5 LIFTER HEIGHT ADJUSTMENT Refer to Fig 12 and Fig 14 1 Adjust the screw d see Fig 12 until the tone arm fits to the tone arm lifter as shown in Fig 14 2 Check to insure that the height of the stylus is around 8mm above the disk surface when the tone arm is supported on the
13. ed with the reference voltage at IC1 3 and the output appears at D The output at 1 is passed EXCLUSIVE OR GATE ANTI COINCIDENCE NOT AGB through the phase correction circuit consisting of C9 through C11 and R18 through R20 to TRI TR1 makes current flow through the Hall Ele ments H1 and H2 which are installed in position under the rotor magnet of the motor The voltage developed across each Hall element is in propor tion to the current flowing through the Hall Elements and the strength of the magnetic field of the rotor magnet The voltages output of the two Hall elements are supplied to the motor drive amplifier consisting of IC4 4 8 TR2 and and IC4 173 and TRS to control motor speed If the motor speed is made late by some cause the FG signal frequency becomes lower The width of the pulse output of the IC3 Mono Multi becomes wider This increases the comparison voltage at which in turn raises the voltage output of IC1 D The result is an increase of the current flowing through and the Hall elements H1 and H2 The current increase the motor drive amplifier so as to make the motor speed fast 2 Operation when the Quartz Lock Switch SW903 is ON Refer to the PLL Circuit schematic diagram of the AP 306 C The 4 42368 MHz signal generated by the crystal oscillator is delivered through TP 1 to IC2 3 The Flip Flop in IC2 halv
14. es the oscillation fre quency of 4 42368 MHz The frequency halved signal is delivered as a clock pulse to IC3 49 which counts it down to 1 27 81 920 Hz for 33 1 3 rpm or 1 20 110 592 Hz for 45 rpm according as set by the Speed Selector Switch SW902 The count down signal which appears at 40 is further counted down to 20 Hz for 33 1 3 rpm or 27 Hz for 45 rpm at IC4 D This output signal of IC4 1 enters the comparison circuit in IC5 7 as a set pulse On the other hand the FG signal fed through the D D circuit to the PLL circuit is waveform shaped by the Schmitt trigger 10713 and is fed through IC1 49 R3 to 1 5 as the reset pulse The reset pulse of 20 Hz for 33 1 3 rpm or 27 Hz for 45 rpm shaped from the FG signal is compared with the above mentioned set pulse entering ICS 7 and the output appears at 5 The output pulse is smoothed by the low pass filter consisting of C9 C10 and R5 through R7 and enters 5 2 then the inverted output is fed from IC5 D The output of ICS fed through R8 and SW903 to 3 in the D D circuit as the reference voltage In short when the Quartz Lock Switch SW903 is off the reference voltage is made of the B voltage while when it is on the pulse made of the FG signal is compared with the pulse generated by the crystal oscillator to produce the reference voltage The succeeding operation is similar to the one when the Quartz Lock Switch is
15. ms AP 306C only Model AP 306 does not include cartridge Induced magnet type 5 6 4 grams 25 Hz to 30 000 Hz 5 More than 23 dB 2 grams 8 x 1076 cm dyn vertical 8 x 1076 cm dyn horizontal 120V 60 Hz for U S A and Canada 220V 50 Hz for European countries except U K 240V 50 Hz for U K and Australia 110 to 120V 220 to 240V switchable 50 60 Hz for other countries 440 W x 158 H x 350 D mm 7 9 kg For improvement purposes specifications and design are subject to change without notice DISMANTLING OF UNIT TURNTABLE In case of trouble etc necessitating dismantling please dismantle in the order shown in the photographs Reassemble in reverse order COVER z SCREWS TABLE SHEET NOTE Photos of dismantling are those of AP 306 but the order applies to AP 306C and AP 206 C also MI CONTROLS 1 MODEL AP 206 C 1 dE aee NOTE AP 206 is not equipped with a cartridge PRG sw WI E HINGE SPINDLE TONE ARM TONE ARM REST TONE ARM LIFTER MAIN WEIGHT 45 rpm ADAPTER HOLDER HINGE STYLUS PRESSURE SCALE RING ANTI SKATING ADJUSTER BUILT IN STROBE LIGHT 45 33 1 3 rpm Speed Selector 33 45 13 14 15 16 17 18 19 20 21 22 Fig 1 PITCH CONTROL 45 rpm PITCH CONTROL 33 1 3 rpm TURNTABLE PLATTER STROBE MARKINGS RUBBER MAT CARTRIDGE SHELL CARTRIDGE SHELL FINGER LEVER LOCKING NUT START CUT LEVER TONE ARM LI
16. needles will seem intertwining as shown below CAUTION In the adjustment only make both voltages equal as these varies with the motor rpm 4 Speed Adjustment VR2 VR3 a Set the Speed selector to the 33 1 3 position For the AP 306 C release the Quartz Lock button to the position b Set the Pitch control to the center _ Move the tone arm to rotate the motor d For the AP 206 C adjust VR3 until the Strobe markings on the first line for 50 Hz power or the second line for 60 Hz power is seen stand ing still For the AP 306 C also adjust VR3 until the single Strobe markings is seen standing still In turn reset the Speed selector to the 45 position f For the AP 206 C similarly adjust VR2 until the Strobe markings on the third line for 50 Hz power or the fourth line for 60 Hz power is seen standing still NOTE It is important that the Strobe markings should not rotate in the reverse direction of the motor or rightward as in the above line drawing 2 PLL P C BOARD ADJUSTMENT Model AP 306 C only 1 Adjusting the Oscillation Frequency VC1 a Connect a frequency counter to TP 1 and pin 5 ground b Set the Speed selector to the 33 1 3 position c Move the tone arm to turn power on d Adjust VC1 until the frequency counter reads 4 423 680 10 Hz CAUTION For turning VCI use a RF adjust ing screwdriver 19 20 22 2msec AROUND 7 5V 2V to 4V OV
17. ocked Loop P C Board AP 3601 in addition to the electrical circuit in the AP 206 C The PLL circuit in the AP 306 C consists of a Quartz Lock Circuit and a Stroboscope Circuit The strobo scope circuit flashes the neon tube NE901 in synchronism with the frequency to which the crystal oscillator frequency is accurately counted down while the neon tube NE901 in the AP 206 C is activated by the line power to flash the Strobe markings on the turntable SERVO CIRCUIT 1 Operation when the Quartz Lock Switch SW903 is OFF Refer to the D D Circuit schematic diagram of the AP 306 C The motor incorporates a FG coil that produces FG signal as the motor rotates The FG signal frequency is 20 Hz for 33 1 3 rpm and 27 Hz for 45 rpm The signal is magnified through 4 8 The magnified FG signal is clamped to positive side by R40 and and enters IC2 D In IC2 the signal is waveform shaped and fre quency doubled The doubled signal is fed to IC3 D as an input to Mono Multi The Mono Multi provides a characteristic that its stable state is inverted by an external trigger into the unstable state where it remains for a predetermined time before returning to the original stable state The pulse output of Mono Multi IC3 9 is smoothed by C7 to DC which is led to 2 as the voltage to be compared When the Quartz Lock Switch SW903 is off a reference voltage is applied to 3 The voltage at IC1 2 is compar
18. off 3 STROBE LIGHT CIRCUIT Refer to the PLL Circuit schematic diagram of the AP 306 C The 4 42368 MHz signal generated by the crystal oscillator is delivered through TP 1 to IC2 3 The Flip Flop in IC2 halves the oscillation frequency to 2 21184 MHz The halved signal is fed from IC2 0 to IC3 09 IC3 counts the frequency down to 1 27 for 33 1 3 rpm or 1 20 for 45 rpm The count down signal is fed from IC3 9 to IC4 00 IC4 further counts the signal down to 160 Hz at IC4 12 320 Hz at IC4 43 and 80Hz at IC4 2 for 33 1 3 rpm or to 216 Hz 432 Hz and 108 Hz for 45 rpm respectively These output signals are input to the NOR circuit of IC6 175 The NOR circuit outputs from IC6 D 80 Hz signal for 33 1 3 rpm 108 Hz signal for 45 rpm The signal is fed through R10 to to turn on and off which flashes the neon lamp NE901 Reference Logic Symbols and Their Truth Table 13 MECHANICAL ADJUSTMENT STYLUS PRESSURE SCALE RING sul nus gt lt _ L ANTI SKATING ADJUSTER Fig 10 1 STYLUS PRESSURE ADJUSTMENT pressure scale ring only to match the 0 mark Refer to Fig 10 with the marker on the weight shaft See Fig 10 1 Plug the power cord into a wall outlet of rated 8 Turn the main weight counterclockwise as viewed voltage from the front with the stylus pressure scale ring 2 Unlock tone arm until the marker on the weight shaft corresponds 3 B
19. ring the tone arm over to the turntable to start to the desired stylus pressure on the scale the motor Pull the Start Cut lever toward you and NOTE 1 The AP 206 and AP 306 Black and release immediately Silver Panel Models do not come equip 4 Wait until the tone arm lift is completely lowered ped with cartridge 5 Keep the tone arm between the turntable and arm 2 The recommended stylus pressure for rest without touching either the supplied stylus AP 206C and 6 Rotate the main weight backward and forward AP 306C only is 2 grams However in until the tone arm is in perfect horizontal balance the case of outside interference more Zero balance is attained pressure may be needed for stability CAUTION 1 Be sure that the Antiskating Ad The range of adjustment is from 0 to juster is set to zero 3 grams 2 Be careful not to damage the stylus 9 Set the antiskating adjuster to correspond with the 7 Without moving main weight turn the stylus stylus pressure Fine adjust if necessary 14 D SPINDLE Pos GROOVE E TABLE SHEET 15 OVER HANG ADJUSTMENT Refer to Fig 11 The distance of the stylus from the turntable shaft when the tone arm is at the turntable is called over hang Although the overhang is preset at the factory for this model adjustment may be necessary when the cartridge is replaced For your convenience the rubber turntable mat has indicator groove at the center for easy overh
20. sition b Connect a DC voltmeter digital voltmeter c Move the tone arm to rotate the motor between pins 6 and 8 ground d Adjust VR1 until the oscilloscope shows a c Short the circuit of pins 9 and 10 waveform or as Fig 17 d Power move the tone arm e Adjust VR4 until the output at pin 6 1s OV 10 mV for the 206 and 80 10 mV for AP 306 C f Power off and open the circuit of pins 9 and 10 g Connect a DC voltmeter digital voltmeter between pins 7 and 8 ground h Short the circuit of pins 4 and S i Power ON move the tone arm 1 Adjust the VRS until the output at pin 7 is OV 10 mV AP 206 C and 80 mV 10 mV for AP 306 C After Off set Voltage Adjustment make the connection as normal position 18 t Fig 18 VCI ISP T cal QUARTZ LOCKED PHASE ANGLE OSC FREQUENCY ROW ROW 2 ROW 3 ROW 4 Fig 19 Fig 20 PLL P C Board Adjust Points 3 Torque Difference Adjustment VR6 a Connect a dual channel AC voltmeter to pins 6 7 and 8 common ground b Set the Speed selector to the 33 1 3 position For the AP 306 C release the Quartz Lock button to the OFF position c Move the tone arm to rotate the motor d Adjust VR6 until the outputs at pins 6 and 7 are of the same level NOTE As the output frequency is as low asa few Hz the voltmeter needles will vibrate minutely In the state of correct adjustment the two
21. tone arm lifter 3 Make certain that silicon oil remains on the tip of the lifter spring If not apply it to prevent mechanical noise MUSIC etc LAST GROOVE Fig 15 6 AUTOMATIC RETURN POSITION ADJUSTMENT Refer to Fig 12 and Fig 15 1 Adjust the screw d see Fig 12 until the tone arm returns automatically at a desired point NOTE The automatic return range is around 5 5 to 6 0 cm from the center of a 30 cm disk see Fig 15 Turning the screw clockwise shifts the return point inward and turning counter clockwise shifts it outward 2 After adjustment play 17 cm and 30 cm disks bak to check that the tone arm returns at a correct point L7 Vill ELECTRICAL ADJUSTMENT e 765 4 A 00 5 VR6 20KB 20KB 300KB B E VR4 VR5 TORQUE OFF SET VOLTAGE DIFFERENCE 4 VR2 VR3 SPEED 20 gt VR2 v IOOKB 1 iei Fig 16 Direct Drive P C Board Adjust Points TL IDEAL BAD All peaks are at the same level Peak levels are not equal Fig 17 1 DIRECT DRIVE P C BOARD 2 Duby Ratio 1 1 Adjustment 1 ADJUSTMENT a Connect an oscilloscope to TP 1 1 Off set Voltage Adjustment VR4 VRS b Set the SPEED selector to the 33 1 3 posi a Disconnect the motor connection wire Open tion pins 4 through 11 and 14 15 then leaving the For the AP 306 C release the Quartz Lock other pins connected button to the OFF po
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