Akai AC 415 K Service Manual

Page 2

CONTENTS

SAFETY INSTRUCTIONS ........................................................................................... 2
INFORMATIONS ........................................................................................................... 3
SPECIFICATIONS ....................................................................................................... 4
CONTROLS ................................................................................................................. 6
I. DISASSEMBLY ........................................................................................................ 8
II. PRINCIPAL PARTS LOCATION ........................................................................... 9
III. DISASSEMBLY OF MAIN COMPONENTS .......................................................... 11
IV. MECHANICAL ADJUSTMENT .............................................................................. 16
V. ELECTRICAL ADJUSTMENT ................................................................................ 17
VI. PARTS LIST ......................................................................................................... 19
VII. ABBREVITIONS .................................................................................................... 34

Page 39

AKA]

MODEL AC-4I O, 413R, 415K
MODEL AC-6'I 0, 613R, 615K

SCHEMATIC DIAGRAMS
AND PC BOARDS

TABLE OF CONTENTS

I. BLOCK DIAGRAMS
1. MAIN .
2. CD .....
3. TUNER & DECK .

II. SCHEMATIC DIAGRAMS AND PC BOARDS
. CONNECTION DIAGRAM
. MAIN (400 SERIES) (AC-410, 413R, 415K) .
. MAIN (600 SERIES) (AC-610, 613R, 615K) .
. DECK/CD/TUNER .
. SYSCON (400 SERIES) (AC-410, 413R, 415K)
. SYSCON (600 SERIES) (AC-610, 613R, 615K) ..

Om-hUM

III. INFORMATION OF ICs .......................................................................................................... fl

Use these schematic diagrams and PC boards together with the provided service
manual.

Page 71

YSTEM CONTROL Ml-COM)

FUNCTION

'1 either sub code SO or $1 is detected.
i Sub P to W.

r 8880 read out.

pt suao 30 bit.

r 5050 read out.

l. (H : MUTE, L : CANCELL

Output to the OPERATION Ml-COM.

Reset at L.

ut irom THE OPERATION Ml-COM.

[cm the OPERATION Ml-COM. (Latching of serial data at falling
ulse.)

M38197MA-148/149FP (SYSTEM CONTROL MI-COM)

nsmission clock input from the OPERATION MI-COM. Pin No PORT NAME 0 FUNCT'ON
1 PLL CLK O PLL clock signal output to the TUNER UNIT.
0' 55P- 2 MAIN \YR; | 2 bit encoder input ior electric volume control.
imftetrocgg': S'gna' '"pm 4 PULSE 1 I TAPE 1 reel pulse input.
9 . . 5 PULSE 2 I TAPE 2 reel pulse input.
tch output to SSP. (Latchlng at fallingedge of the pulse.) 6 LEVEL 5 | ND input for surround level meter.
nsmission °I°°k output 1° SSP 7 LEVEL C | ND input for center level meter.
sition ON/OFF detection input OI Skid motor. (Input A) 8 SPANA | A/D input for spectrum analyzer indication.
SIIIOU ON/OFF detection input OI sled motor. (Input B) 9 CLK LED 0 Clock output for LED section expansion IC.
sition ON/OFF detection input of sled motor. (input 0) 10 PLL OUT 0 PLL control output to the TUNER UNIT.
n Input terminal. L when X'tal is 16.9344 MHz. H when 33.8688 MHZ. 11 STB FLD O Strobe pulse output to DOLBY PRO~LOGIC FLD drive IC.
ON/OFF control. 12 CLK FLD O Clock output to DOLBY PRO-LOGIC FLD drive IC.
ut terminal. For SENS output and servo automatic sequencer. 13 DATA FLD 0 Data output 10 DOLBY PRO-LOGIC FLD drive IC.

14 PHOTO IN I Input from the TRAY rotation position detect photo sensor.
lior spindle motor. 15 CD XLAT O Latch output for the CD MI-COM.

16 CD CLK 0 Serial clock output to the CD Ml-COM.

17 CD DATA 0 Serial data output to the CD MI

. 18 MODE SW | ND input irom the CD's open, close and clamp switches.
Dior TEST terminal. . . .
, , 19 CLK TCDK O Clock output for controlling the expanSIon IC oi the TUNER/CD/DECK sectlort.
I" 5 PLL (5'3 = "5" PLL) 20 CD SOCK o SQCK clock output to the co Ml-COM.
or master PLL' 21,85 N.C - No connection.
P output for master PLL 22 co $050 I sueo so bits serial input.

23 DATA D80 0 Serial data output for controlling the DIGITAL SOUND CONTROL IC.
voltage InPUl for 1351 __ 24 DATA 0 Serial data output to the expansion ICs (for KEY control & EVR ICs, etc.).
nput. 25 OSC PWM O Erasing OSC level control output.(PWM)
circuir constant current input. 26 BOP | Blank output pulse input. (L : blank)
compilasion voltage input. 27 EZPR DAT |/O EEP ROM serial data input/output.
rig output. (L = VSS, H = VDD) 28 EZPFI CLK 0 Serial clock output to EEP ROM.
ry circuit OFF H : Asmmetry circuit ON. 29 CD SENS | Input pin lor reading verious data from the CD MI-COM.

30 R CLK I Clock input from RDS data processor.

E for 48 bit slot. LR clockf = Fs 31 CLK DSC O Clock Output to the DIGITAL SOUND CONTROLLOFI.
DAC 32 REMOCON I Remote control signal input.
:3:po ir1gr-face_ 33 CLK AMP O imks::ii:;)m the expansmn ICs (EVR, Key control, etc. among the PRE/MAIN
nput 0 DAC' 34 CD SCOR | Sub code detect input from the CD MI-COM. (H : sub code 0 or 1 is detected)
m 00* interiace- 35 RESET l Reset input
ut to DAC. 36 X0 IN I 32.768 kHz Xtal input for clock.

37 X0 OUT 0 Output to the 32.768 kHz X'tal.

38 X IN I 8.0 MHz X'tal input.

39 X OUT 0 Output to the 8.0 MHZ X'tal.

40 GN D-D - Digital ground.

41 - 44 KEYt - 4 | Key matrix input from the operation switches.
45 - 60 DIG 1 - 18 0 System FLDs grid drive output.
61 - 80 SE61 - 20 0 System FLDs segment drive output. (SEG 17~20 : 700 series models only)

81 POW DOWN | Back up voltage detection input. (H : normal, L : Power down)

82 STEI AMP O Strobe pulse output for AMP section expansion IC.

83 OE 0 Output enable control for expansion ICs. (L: enable, H : expansion IC output -~ high

impedance).

84 STB VFI O Strobe pulse output lor EVR (electric volume) IC.

86 STB TCDK O Strobe pulse output for TUNER/DECK/CD section expansion ICs.

erminal. 87 STB PRE O Strobe pulse output for PRE AMP section expansion IC.

ien a playback disc is emphasised. L output when no emphasis. 88 STB MEC O Strobe pulse output for DECK MECHA. section expansion IC.
is control input. (H ; ON, L 3 OFF) 89 R DATA I Data input lrom RDS data processor.

to Frame Clock) output. 90 R START I Start signal input from RDS data processor.

91 V00 - +5 V power supply.

92 R RESET 0 Reset output to RDS error correction IC. (L : reset)

93 STEREO | A/D input tor the "STEREO" indicator.

out olt base) 94 TUNED | ND input for the TUNED" indicator.

J ' (TPLSI e p 95 STB LED 0 Strobe pulse output tor LED section expansion IC.
'9- l''l?a,5"l . , , 96 PLL IN I PLL control input from the tuner unit,

IZ Xtal uselllation circun Input. 97 PLL CE 0 PLL chip enable output to the tuner unit.

I2 Xtal oscillation Circuit um" 98 -VP I Negative power supply for FLD blanking.

output. (opposite phase) 99 vss - To be grounded.

OUIPUI- (in-phase) 100 VREF | Reierence voltage input. (+5 V)