Akai TX-350, TX-550 Service manual

Service Manual

MINI COMPONENT SYSTEM

Model : TX-350 /TX-550

AKAI ELECTRONICS CO., LTD.

MINI COMPONENT SYSTEM

TX-350/TX-550

Table of Contents

SAFETY PRECAUTIONS......................................................................................... 2

ADJUSTMENTS....................................................................................................... 4

EXPLODED VIEW AND PARTS LIST ...................................................................... 5

WIRING DIAGRAM ................................................................................................... 8

BLOCK DIAGRAM .................................................................................................... 9

SCHEMATIC DIAGRAM ........................................................................................... 10

POWER / AMP /TUNER / TAPE .................................................................................................... 10

CD .................................................................................................................................................... 11

CONTROL ........................................................................................................................................ 12

PCB PATTERN LAYOUT ........................................................................................ 13

ELECTRICAL PART LIST ....................................................................................... 17

- 1 -

Safety Precautions

WARNING

THIS APPLIANCE TO RAIN OR MOISTURE.

CAUTION :

TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS POLARIZED AC PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.

THIS UNIT EMPLOYS A LASER. ONLY QUALIFIED SERVICE PERSONNEL SHOULD REMOVE THE COVER OR ATTEMPT TO SERVICE THIS DEVICE DUE TO POSSIBLE EYE INJURY.

CAUTION :

OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

CAUTION :

PLUG TO WIDE SLOT, FULLY INSERT.

ATTENTION :

LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU'AU FOND.

: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE

CAUTION

RISK OF ELECTRIC SHOCKS

DO NOT OPEN

TO REDUCE THE RISK IF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE PRESENCE OF UNINSULTED "DANGEROUS VOLTAGE"

WITHIN THE PRODUCT'S ENCLOSURE THAT MAY BE

SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK TO PERSONS.

THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS IN THE LITERATURE ACCOMPANYING THE APPLIANCE.

CAUTION

LASER SAFETY

USE OF ANY CONTROLS, ADJUSTMENTS, OR PROCEDURES

TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF

POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE

Important Safety Instructions

- All the safety and operating instructions should be read before the appliance is operated.

- The safety and operating instructions should be retained for future reference.

- All warnings on the appliance and in the operating instructions should be adhered to.

- All operating and use instructions should be followed.

1. Water and Moisture - The appliance should not be

water - for example, near a bathtub, washbowl, kitchen sink,

used near

laundry tub, in a wet basement, or near a swimming pool, and the like.

PORTABLE CART

Figure 2

only as recommended by the manufacturer.

ceiling

5. Ventilation - The appliance should be situated so location or position does not interfere with ventilation. For example, the appliance on a bed, sofa, rug, or ventilation as a bookcase or cabinet that may impede the flow

through the ventilation openings.

6. Heat - The appliance should be situated away from sources such as radiators, heat registers, appliances (including amplifiers) that

7. Power Sources - The appliance should be power supply only of the type instructions or as marked

8. Grounding or Polarization - The precautions that taken so that the grounding or

appliance is not defeated.

9. Power - Cord Protection - Power-supply cords routed so that they are not likely to be by items placed upon or attention to cords at point where

10.Protective Attachment Plug - If the appliance is equipped with an attachment plug having overload safety feature. resetting of required, be sure the replacement plug

same overload protection as the original plug.

11.Cleaning - The appliance should be cleaned only as recommended by the manufacturer.

12.Power Lines - An outdoor antenna should be located from power lines.

openings; or, placed in a built-in installation, such

protective device. If replacement of the plug is

2. Carts and Stands - The appliance should be used only with a cart or stand that is recommended by th manufacturer.

3. An appliance and cart combination should

be moved with care. Quick

stops, excessive force, and uneven surfaces may cause the appliance

and

cart combination to overturn.

4. Wall or Ceiling Mounting - The appli-

ance

should be mounted to a wall or

its proper

should not be situated

similar surface that may block the

stoves, or other

produce heat.

connected to a

described in the operating

on the appliance.

polarization means of an

walked on or pinched

against them, paying particular

plugs, convenience receptacles, and the

they exit from the appliance.

protection. This is a

See Instruction Manual for replacement or

service technician has used a

specified by the manufacturer that has the

that its

of air

should be

heat

away

- 2 -

Safety Precautions

13.Outdoor Antenna Grounding - If an outside antenna connected to the receiver be sure the antenna

system is

grounded so as to provide some protection against voltage surges and built-up static Electrical Code, regard to

proper grounding of the mast and supporting

charges. Article 810 of the National

ANSI/NFPA 70, provides information with

structure, grounding of the lead-in wire to an antenna-dis charge unit, size of grounding conductors,location of antennadischarge unit, connection to grounding electrodes and requirements for the grounding electrode. See Figure 1.

EXAMPLE OF ANTENNA GROUNDING

GROUND CLAMP

ELECTRIC SERVICE EQUIPMENT

NEC - NATIONAL ELECTRICAL CODE

POWER SERVICE GROUNDING ELECTRODE SYSTEM (NEC ART 250 PART H)

ANTENNA LEAD IN WIRE

ANTENNA DISCHARGE UNIT (NEC SECTION 810-20)

GROUNDING CONDUCTORS (NEC SECTION 810-21)

GROUND CLAMPS

14.Non-use Periods - The power cord of the appliance should be unplugged from the outlet when left

unused for a long period

of time.

15.Object and Liquid Entry - Care should be taken so

that objects do not fall and liquids are not spilled into the enclosure through openings.

16.Damage Requiring Service - The appliance should

serviced by qualified service personnel when: a) The power-supply cord or the plug has been b) Objects have fallen, or liquid has been spilled

damaged; or

into the appliance; or c) The appliance has been exposed to rain; or

d) The appliance does not appear to operate exhibits a marked change in

performance; or

e) The appliance has been dropped, or the

normally or

enclosure

damaged.

17.Servicing - The user should not attempt to service the appliance beyond that described in the operating instructions.

All other servicing

should be referred to qualified service

personnel.

- 3 -

Output Level

Frequency Counter

Test Tape

Adjustments

TAPE SECTION

Measurement

Input Level Measurement Point

Point

R-CH

L-CH

47 kohm

Input Point

VTVM

Scope

Test Tape be used

Tape Contents Use

MTT-111N 3 KHz Tape Speed Adjustment MTT-114N 10 KHz Head Azimuth Adjustment

MTT-5511 Blank Record Frequency Property

HEAD ADJUSTMENT (AZIMUTH)

1. 10KHz test tape(example: MTT-114N) must be used for this adjustment.

2. Connect to VTVM or oscilloscope to the headphone jack or speaker terminal.

3. Press the play button.

4. Adjust the azimuth by using a screw driver to maintain the max. L&R output voltage.

5. Adjust tape A(1), tape B(2) respectively, Please secure the azimuth position by using locking paint.

RECORDING BIAS OSCILLATOR FREQUENCY ADJUSTMENT

1. Connect the frequency counter to TP603, GND.

2. Press the REC button.

3. Adjust L603 to obtain 80 KHz±100Hz

TAPE ALIGNMENT CHART

Step Item Reference Value Test Tape Adjust Point Test Point Note FIG.

Tape Speed

Adjustment

Azimuth Adjustment Recording Bias Oscilla-

tor Frequency Adjust-

ment

Normal

High

3,015~3,025Hz MTT-111N RV601

3,000~3,010Hz MTT-111N RV601

5,820~6,180Hz MTT-111N - - - - - -

Maximum Level Phase:Within90°

80 KHz± 0.5

MTT-114N Head Screw

MTT-5511 L603

Line Out L/R Channel

Shorted TP601,

TP602 Line Out L/R

Channel TP603,GND

Confirm Wow & Flutter is within 0.35%

Confirm Tape Speed of end position after adjustment at tape start position

Confirm High speed after normal speed

adjustment

Adjust with frequency counter connected.

FIG.1

FIG.2,3,4

FIG.1

Test Tape : MTT-111N(3kHz)

MTT-5511(Blank)

Set

Output Level Measurement Point

FIG. 1 : Tape Speed & Record Bias Oscillator

Frequency Adjust Circuit

L-CH

Screw Angle

Peak

R-CH

Peak

within

1 dB

Output Level

L-CH Peak

R-CH Peak

within

1 dB

Screw Angle

FIG. 3 : Tape Azimuth Adjust Head Screw & Waveform

- 4 -

Adjust with Frequency

Counter Connected

Forward

Side

FIG. 2 : Tape Azimuth Adjust Location

(Record/Playback Head)

MTT-114N

(10kHz)

L-CH

Set

Screen Pattern

In Phase 45 90 135 180

Good Wrong

Oscilloscope

V H

Output Level Measurement Point

FIG. 4 : Tape Azimuth Adjust Circuit & Waveform

Exploded View and Mechanical Parts List

Model No:TX-350 / TX-550

- 5 -

Exploded View and Mechanical Parts List

Model No: TX-350/550

NO PARTS NAME CODE NO Q'ty REMARKS

1 PANEL FRONT 9CD0307100 MIPS 1 2 BADGE DAEWOO 9CD1500900 ABS 1 3 DOOR CASSETTE A/B 9CD1810500 MIPS 1 4 WINDOW DOOR A/B 9CD16153B0 ACRYL 1

5 DOOR FRAME A/B

6 SRING DOOR EJECT L/R 9CD3007800 1 7 DOOR CD 9CD1810600 MIPS 1 8 WINDOW FLT 9CD1615400 ACRYL 1

9 KNOB FUNCTION 9CD1337900 ACRYL 1 10 KNOB CD 9CD1338000 ABS 1 11 KNOB POWER 9CD1338100 ABS 1 12 KNOB CONTROL 9CD1338200 ABS 1 13 KNOB EQ L 9CD13383L0 ABS 1 14 KNOB EQ R 9CD13383R0 ABS 1 15 KNOB VOLUME 9CD1334400 ABS 1 16 GUIDE FLT 9CD2505600 ABS 1 17 PLATE FILTER 9CD0910700 PC T0.3 1 18 BRKT SIDE 9CD2412900 ABS 2 19 DAMPER GEAR B 9CD2603200 ACETAL 2 20 DAMPER BASE B 9CD2603300 ACETAL 2 21 LOCKER BASE 9CDOB01900 ACETAL 2 22 LOCKER CAM 9CDOB02000 ACETAL 2 23 LOCKER SPRING 9CDOB01600 STS 2 24 CASSETTE DECK LOGIC 9CD6007000 ADR-2138MW 1 25 CUSHION FOOT 9CD4207700 EVA 2 26 COVER BACK 9CD0411100 MIPS 1 27 COVER TOP 9CD0409600 MIPS 1 28 CHASSIS BOTTOM 9CD0607100 SCP 1 29 HEAT SINK 50 9CD4404800 AL 1 30 HEAT SINK AL 1 31 BRACKET HEAT SINK 9CD2414400 ST 0.3 1 32 COVER SIDE L 9CD04112L0 MIPS 1 33 COVER SIDE R 9CD04112R0 MIPS 1 34 BRAKETHEAT SINK 9CD2414600 BSP 0.5T 1 35 HOLDER AC CORE 9CD2303300 ABS 36 CD DECK MECHA 9CD6007000 1 37 PLATE FLT 9CD0909800 PVC SHEET T1.0 2 38 PLATE FUNCTION 9CD0910000 PVC SHEET T0.5 1

9CD18113A0 9CD18113B0

DESCRIPTIONS

ABS 1

ONLY AMI-N822 ONLY AMI-N722

- 6 -

Exploded View and Mechanical Parts List

Model No: TX-350/550

NO PARTS NAME CODE NO Q'ty REMARKS

P1 FRONT PCB 1 P2 CD DECK PCB 1 P3 MAIN PCB 1 P4 POWER PCB 1 S1 SCREW TAPTTITE 7173261011 TT2 BIN 2.6 X 10 MFZN 13 S2 SCREW TAPTTITE 7173301011 TT2 BIN 3.0X10 MFZN 21 S3 SCREW TAPTTITE 7173301212 TT2 BIN 3.0X12 BK 20 S4 SCREW TAPTTITE 7173301612 TT2 BIN 3.0X 6 MFZN 4 S5 SCREW TAPTTITE 7173400611 TT2 BIN 4.0X 6 MFZN 4 S6 SCREW WASHER 9CD3102400 3.0X10+D14 MFZN 1 S7 SCREW WASHER 9CD3102401 4

DESCRIPTIONS

Ref : AMI-N822

3.0X8+D14

- 7 -

WIRING DIAGRAM

Model No:TX-350 / TX-550

SN:9738832101 7P 250MM

SN:9738833900 10P 350MM

CW704

CW900

P/T

SN : 9738835000 3P 260MM

FUNCTION

CN400

CN401

50W

30W

CW601

CW602

CW600

CW400

TUNER

CN900

CW508

CW503CW501

CN502

CW502

CN509

CW507

10P CONN PINSN : 9736407800

SN:9738840900 19P 110MM

SN : 9738804300 7P 350MM

FD701

Pick-Up

IC702

CW703

SN : 9736407600 13P CONN PIN

SN : 9738833700 8P 220MM

PLAY HEAD

R/P HEAD

CW401

CW402

SN : 9738834000 11P 150MM SN : 9738834100 13P 100MM

CN704

CN508

CN701

- 8 -

CN703

CD MECHA. ASS'Y

BLOCK DIAGRAM

Model No:TX-350 /TX-550

- 9 -

Schemetic Diagram

Model No:TX-350 / TX-550

Ass'y Name: POWER/AMP/TUNER/TAPE

S-CURVE

anti aliasimg

PLL 57KHz RDS/ARI

QUAL

R/DATA

AM/FM IF BUFF

811 7124 910 15

VSS2 VSS3

8th switched capacitor

TEST

filter

comparator

BIPHASE

PLL

1187.5Hz

R/CLK

1612 3 6 145 13

Differential

DECODER

CLOCK

V REF

ANALOG

VSS1

VDD1

19K 19K 0

304KHz

ALC

PD1

VSS

XOUT

XIN

DACECK

VDD

FMIN

AM/FM

IFIN

AMIN

IF REQ

ST/MO

- 10 -

Schemetic Diagram

Model No:TX-350 / TX-550

Ass'y Name: CD

- 11 -

Schemetic Diagram

Model No:TX-350 /TX-550

Ass'y Name: CONTROL

- 12 -

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