Akai AP-206 User manual

AP-206
,.: .
AP-306
AKAI DIRECT DRIVE TURNTABLE
AND
AI{AI DIRECT DRIVE QUARTZ LOCK TURNTABLE
MODEL
MODEL
AP·206
AP·306
ALSO APPLICABLE TO BLACK MODEL
SECTION 1 SERVICE MANUAL . . . . . . . . . . . . . . . . . . . . . . .. 3
SECTION 2 PARTS LIST 31
SECTION 3 SCHEMATIC DIAGRAM 48

2

SECTION 1
SERVICE MANUAL
TABLE OF CONTENTS
I. TECHNICAL DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4
1. MODEL AP-206/C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4
2. MODEL AP-306/C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5
11. DISMANTLING OF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6
Ill. CONTROLS 7
1. MODEL AP-206/C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7
2. MODEL AP-306/C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8
N. PRINCIPAL PARTS LOCATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9
1. MODEL AP-206/C 9
2. MODEL AP-306/C 10
V. BLOCK DIAGRAM 11
1. MODEL AP-206/C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11
2. MODEL AP-306/C- " 11
VI. CIRCUIT OPERATION 12
1. GENERAL 12
2. SERVO CIRCUIT 12
3. STROBE LIGHT CIRCUIT 13
VII. MECHANICAL ADJUSTMENT 14
1. STYLUS PRESSURE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . .. 14
2. OVER HANG ADJUSTMENT 15
3. SLEEVE POSITION ADJUSTMENT 16
4. PU PLATE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16
5. LIFTER HEIGHT ADJUSTMENT 17
6. AUTOMATIC RETURN POSITION ADJUSTMENT 17
VIII. ELECTRICAL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 18
1. DIRECT DRIVE P.C BOARD ADJUSTMENT 18
2. PLL P.C BOARD ADJUSTMENT 19
N. CLASSIFICATION OF VARIOUS P.C BOARDS 21
1. P.C BOARD TITLE AND IDENTIFICATION NUMBER 21
2. COMPOSITION OF VARIOUS P.C BOARDS 22
3

I. TECHNICAL DATA
1. MODEL AP-206jC
TURNTABLE 314 mm aluminum alloy die-cast
DRIVE SYSTEM Direct drive, Auto-return J-
MOTOR DC Servo Motor
SPEED & PITCH CONTROL 33-1/3 and 45 rpm ±2.5%
SPEED ACCURACY 1,000 Hz ±0.15%
WOW AND FLUTTER 0.035% (DIN), 0.025% (JIS)
RUMBLE Better than 49 dB (DIN A), 70 dB (DIN B)
TONE ARM Static-balanced type with Anti-skating Adjuster
ARM LENGTH 220 mm
STYLUS PRESSURE ADJUSTMENT RANGE
o to 3 grams
APPLICABLE CARTRIDGE WEIGHT 4 to 12 grams
ARM LIFTER Oil-damped
OVERHANG 15 mm
OFFSET ANGLE 22°30'
HORIZONTAL TRACKING ERROR ANGLE ±2°
SHELL WEIGHT 7.8 grams
CARTRIDGE (AP-206C only: Model AP-206 does not include cartridge) Induced
magnet type
CARTRIDGE WEIGHT 6.4 grams
FREQUENCY RESPONSE 25 Hz to 30,000 Hz
OUTPUT VOLTAGE 5 mV
CHANNEL SEPARATION More than 23 dB
OPTIMAL STYLUS PRESSURE 2 grams
DYNAMIC COMPLIANCE 8 x 10-
6
cm/dyn vertical
8 x 10-
6
cm/dyn horizontal
POWER REQUIREMENTS' 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
1'10 to 120V, 220 to 240V switchable 50/60 Hz for other countries
DIMENSIONS 440(W) x 158(H) x 350(D) mm
WEIGHT 7.4 kg
STANDARD ACCESSORIES
45 rpm Adapter .
Minus driver ....
Operator's Manual
1
1
1
* For improvement purposes, specifications and design are
subject to change without notice.
4

2. MODEL AP-306jC
TURNTABLE 314 mm aluminum alloy die-cast
DRIVE SYSTEM Quartz Lock Direct Drive, Auto-Return, . ",. '
MOTOR DC Servo Motor J'
. "
SPEED & PITCH CONTROL 33-1/3 and 45 rpm ±2.5%
SPEED ACCURACY 1,000 Hz ±0.08%
WOW AND FLUTTER 0.035% (DIN), 0.025% (JIS)
RUMBLE Better than 49 dB (DIN A), 70 dB (DIN B)
MOMENT OF INTERIA 230 kg.cm?
TONE.,ARM Static-balanced type with Anti-skating Adjuster
ARM LENGTH 220 mm.
STYLUS PRESSURE ADJUSTMENT RANGE
o to 3 grams
APPLICABLE CARTRIDGE WEIGHT 4 to 12 grams
ARM LIFTER Oil-damped
OVERHANG 15 mm
OFFSET ANGLE 22°30'
HORIZONTAL TRACKING ERROR ANGLE ±2°
SHELL WEIGHT 7.8 grams
CARTRIDGE (AP-306C only: Model AP-306 does not include cartridge) Induced
magnet type
CARTRIDGE WEIGHT 6.4 grams
FREQUENCY RESPONSE 25 Hz to 30,000 Hz
OUTPUT VOLTAGE 5 mV
CHANNEL SEPARATION More than 23 dB
OPTIMAL STYLUS PRESSURE 2 grams
.'
DYNAMIC COMPLIANCE 8 x 10-
6
cm/dyn vertical
8 x 10-
6
cm/dyn horizontal
POWER REQUIREMENTS 120V, 60 Hz for U.S.A. and Canada
220V, 50 Rz 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
DIMENSIONS 440(W) x 158(H) x 350(D) mm
WEIGHT 7.9 kg
ST ANDARD ACCESSORIES
45 rpm Adapter .
Minus driver. . . .
Operator's Manual
1
1
1
* For improvement purposes, specifications and -design are
subject to change without notice.
5

11.DISMANTLING OF UNIT
In case of trouble, etc. necessitating dismantling, please
dismantle in the order shown in the photographs.
Reassemble in reverse order.
1
CARTRIDGE
2
3
4
BOTTOM COVER
I
g
SCREWS
5
NOTE: Photos of dismantling are those of AP-306, but the order applies to AP-306C and AP-206jC also .
.r
6

Ill. CONTROLS
1. MODEL AP-206/C
Fig. 1
1. HINGE
2.. SPINDLE
3. TONE ARM
4. TONE ARM REST
5. TONE ARM lIFTER
6. MAIN WEIGHT
7. 45 rpm ADAPTER HOLDER
8. HINGE
9. STYLUS PRESSURE SCALE RING
10. ANTI·SKATING ADJUSTER
11. BUILT·INSTROBE LIGHT
12. 45/33·1/3 rpm Speed Selector (.•. 33 .-.45)
13. PITCH CONTROL (45 rpm)
14. PITCH CONTROL (33·1/3 rpm)
15. TURNTABLE PLATTER
16. STROBE MARKINGS
17. RUBBER MAT
18. CARTRIDGE SHELL
19. CARTRIDGE SHELL FINGER LEVER
20. LOCKING NUT
21. START/CUT LEVER
22. TONE ARM lIFTER LEVER
( .Y to Lower ~ to Lift)
NOTE: AP-206 is not equipped with a cartridge.
7

2. MODEL AP-306/C
01-------;.
A.
®f-----~~
(j)f--------=--------1.
®r-----::==---
9f------../
Fig. 2
1. HINGE
2 RUBBER MAT
3. SPINDLE
4. TURNTABLE PLATTER
5. STROBE MARKINGS
6. BUI LT-I N STROBE LIGHT
7. SPEED SELECTOR SWITCH
8. QUARTZ LOCK SWITCH
9. PITCH CONTROL
10. 45 rpm ADAPTER HOLDER
11. HINGE
12. MAIN WEIGHT
13. STYLUS PRESSURE SCALE RING
14. ANTI-SKATING ADJUSTER
15. TONE ARM LlFTER
16. TONE ARM REST
17. TONE ARM
18. TONE ARM LlFTER LEVER
19. LOCKING NUT
20. START/CUT LEVER
21. CARTRIDGE SHELL FINGER LEVER
22. CARTRIDGE SHELL
NOTE: AP-306 is~ot equipped with a cartridge.
r:.
8

IV. PRINCIPAL PARTS LOCATION
1. MODEL AP-206jC
AUTO CLUTCH IA I
AUTO CLUTCH IB I
.:,.
,,"
••~---"'+-+- MAIN WEIGHT
••••• II--'''''--I---'f- ~gt~S ~~~SSURE
() '" •• ••
M
~. GEAR
$ t« e
(i,
f.
. I
~
TONE ARM LI FTER
"".t--I-----1f--+- TONE ARM
•••..•=c===i--t- TONE ARM REST
REJECT LEVER·- --~-r------1-----~~
BUILT-IN
STROBE LIGHT
45/33 rpm
SPEED SELECTOR
RELAY P.C BOARD
IAP- 26521
PU PLATE IAI
PU PLATEIBI
SEESAW LEVER
i1
s
'-'
~
~'
PITCH CON~RO_ 45rpm)
PITCH CON
T
ROL,33rpm
TONE ARM
LlFTER LEVER
".".;c=~~----1f---7-CARTRIDGE SHELL
Fig. 3 AP-206jC Top View with Dust Cover Removed
MICRO SWITCH I SW901 1 POWER SUPPLY P.C BOARDIAP-26411
POWER TRANS (T901 1
AUTO LEVER --~~~---1~~~~----
LlFTER SPRING O- ~H--D.D P,C BOARD
IAP- 26421
,,*~-~~H-MOTOR BLOCK(DDM-331
NEON LAMP P.C BOARD
IAP- 26531
Fig.4 AP-206jC Bottom View with Bottom Case Removed
9