Yamaha GX-500-VCD Service Manual

GX-500/GX-500VCD

。

MINI COMPONENT SYSTEM

GX-500

GX-500VCD

SERVICE MANUAL

GX-500 is composed of GX-500 and NX-GX500.

GX-500VCD is composed of GX-500VCD and NX-GX500.

IMPORTANT NOTICE

This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel. It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already known and understood by the users, and have therefore not been restated.

WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in

IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization, certifica-

The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributor's Service Division.

WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have

IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the

personal injury, destruction of expensive components, and failure of the product to perform as specified. For these reasons, we advise all YAMAHA product owners that any service required should be performed by an authorized YAMAHA Retailer or the appointed service representative.

tion or recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.

accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).

unit.

GX-500/VCD

■ CONTENTS

TO SERVICE PERSONNEL ..................................... 1~2

GX-500 PANELS ....................................................... 3~4

GX-500VCD PANELS ...................................................5

SPECIFICATIONS ......................................................... 6

INTERNAL VIEW .......................................................... 7

DISASSEMBLY PROCEDURES ............................ 8~12

VOLUME RANGE ....................................................... 13

SYSTEM CONTROL CHECK ..................................... 13

TEST MODE ................................................................ 14

SYSTEM TEST MODE................................................ 14

RECEIVER TEST MODE ...................................... 15~16

TAPE TEST MODE .....................................................16

CD TEST MODE ......................................................... 17

ALL FUNCTION TEST MODE.................................... 18

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100672

CD ERROR MESSAGES ............................................18

CD STANDARD OPERATION CHART ................19~22

ADJUSTMENTS ....................................................23~25

IC DATA ................................................................26~32

DISPLAY DATA .................................................... 33~34

BLOCK DIAGRAM ................................................35~39

PRINTED CIRCUIT BOARD .................................40~62

PIN CONNECTION DIAGRAM ................................... 63

SCHEMATIC DIAGRAM .......................................64~71

PARTS LIST ........................................................72~103

GREASE APPLICATION DIAGRAM................104~105

GX-500 REMOTE CONTROL TRANSMITTER ........ 106

GX-500VCD REMOTE CONTROL TRANSMITTER ....

NX-GX500..................................................................108

107

GX-500/GX-500VCD

■ TO SERVICE PERSONNEL

1. Critical Components Information. Components having special characteristics are marked and must be replaced with parts having specifications equal to those originally installed.

2. Leakage Current Measurement (For 120V Models Only). When service has been completed, it is imperative to verify

GX-500/VCD

that all exposed conductive surfaces are properly insulated from supply circuits.

● Meter impedance should be equivalent to 1500 ohm shunted

by 0.15µF.

WALL

OUTLET

● Leakage current must not exceed 0.5mA.

● Be sure to test for leakage with the AC plug in both

polarities.

EQUIPMENT

UNDER TEST

INSULATING

TABLE

“CAUTION”

“F201 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 2.0A, 125V FUSE.” “F202 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 4.0A, 125V FUSE.”

CAUTION

F201 : REPLACE WITH SAME TYPE 2.0A, 125V FUSE. F202 : REPLACE WITH SAME TYPE 4.0A, 125V FUSE.

ATTENTION

F201 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 2.0A, 125V. F202 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 4.0A, 125V.

CAUTION : USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE

SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

THE COMPACT DISC PLAYER SHOULD NOT BE ADJUSTED OR REPAIRED BY ANYONE EXCEPT PROPERLY QUALIFIED SERVICE PERSONNEL.

AC LEAKAGE

TESTER OR

EQUIVALENT

PROTECTION OF EYES FROM LASER BEAM DURING SERVICING

This set employs a laser. Therefore, be sure to carefully follow the instructions below when servicing .

1. Laser Diode Properties

● Material : GaAlAs

● Wavelength : 780 nm

● Emission Duration : Continuous

● Laser Output : max. 44.6 µW*

* This output is the value measured at a distance of about 200 mm from the objective lens surface on the Optical

Pick-up Block.

2. When checking the laser diode emission, keep your eyes more than 30 cm away from the objective lens.

WARNING: CHEMICAL CONTENT NOTICE!

The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHATSOEVER!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/flux vapor!

If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food.

GX-500/GX-500VCD

q B, G, R, L, T models w B, G, R, L, T models

English

THIS PRINTING (SEE POSITION SHOWN IN THE ILLUSTRATION) INFORMS THE USER THAT THE APPARATUS

➀

CONTAINS A LASER COMPONENT.

➁ THIS LABEL (SEE POSITION SHOWN IN THE ILLUSTRATION) WARNS THAT ANY FURTHER PROCEDURE WILL

BRING THE USER INTO EXPOSURE WITH THE LASER BEAM. CAUTION : USE OF CONTROLS, ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE

SPECIFIED HEREIN, MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

GX-500/VCD

Swedish

DENNA MÄRKNING (SE FIGUR) UPPLYSER OM ATT DET I APPARATEN INGÅR EN LASERKOMPONENT AV

➀

TYP KLASS 1.

➁ VARNINGSMÄRKNING (SE FIGUR) FÖR STRÅLNING. INGREPP I APPARATEN BÖR ENDAST FÖRETAGAS AV

FACKMAN MED KÅNNEDOM OM LASER. APPARATEN INNEHÄLLER EN LASERKOMPONENT SOM AVGER STRÅLNING ÖVERSTIGANDE GRÄNSEN FÖR LASERKLASS 1.

VARNING : OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD: BETRAKTA EJ STRÅLEN.

Danish

DETTE MÆRKAT ER ANBRAGT SOM VIST I ILLUSTRATIONEN FOR AT ADVARE BRUGEREN OM AT AP-

➀

PARATET INDEHOLDER EN LASERKOMPONENT.

➁ DETTE MÆRKAT OM LASEREN ER ANBRAGT PÅ APPARATET SOM EN OPLYSNING OM AT APPARATET

INDEHOLDER ET LASERKOMPONENT. ADVARSEL : INDGREB BOR KUN FORETAGES AF EN FAGMAND DA DER ER RISIKO FOR RADIOAKTIV

STRÅLING.

ADVARSEL : USYNLIG LASERSTRÅLING VED ÅBNING.

UNDGÅ UDSAETTELSE FOR STRÅLING.

Finnish

VARO! : AVATTAESSA OLET ALTTIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.

GX-500/GX-500VCD

■ GX-500 PANELS

▼ U, C, R, A models

GX-500/VCD

▼ B, G models

● NX-GX500

320(12-5/8")

200(7-7/8")

GX-500/GX-500VCD

▼ U, C models

▼ R model

GX-500/VCD

▼ A model

▼ B, G models

GX-500/GX-500VCD

■ GX-500VCD PANELS

GX-500/VCD

● NX-GX500

▼ R, T models

320(12-5/8")

200(7-7/8")

▼ L model

■ SPECIFICATIONS

GX-500/GX-500VCD

■ AMPLIFIER SECTION

Minimum RMS Output Power per Channel

1kHz, 0.9% THD, 6Ω......................................80W + 80W

1kHz, 10% THD, 6Ω...................................100W + 100W

Input Sensitivity/Impedance

AUX/MD ........................................................ 200mV/47kΩ

Spectrum Analyzed Band ............................................. 5 band

(100Hz, 350Hz, 1kHz, 3.5kHz, 10kHz)

■ VIDEO SECTION (GX-500VCD only)

Signal Level ..............................................................1Vp-p/75Ω

■ TUNER SECTION

FM Tuning Range

U, C models.......................................... 87.5 to 107.9MHz

R, T models ........ 87.5 to 108.0MHz/87.50 to 108.00MHz

A, B, G, L model............................... 87.50 to 108.00MHz

AM Tuning Range

U, C models............................................ 530 to 1,710kHz

R, T models .................530 to 1,710kHz/531 to 1,611kHz

A, B, G, L models ................................... 531 to 1,611kHz

FM Usable Sensitivity (75Ω)

30dB S/N Quieting, Mono, 1kHz,

100% mod. R, U, C, L, T models .........1.5µV (14.8dBf)

DIN Mono, S/N 26dB (A, B, G only) ........................1.8µV

■ CD CHANGER SECTION

Type .......................................... 3-Disc Carousel Auto-changer

Signal Readout......................................................Non-contact,

3-beam semi-conductor laser pick-up

D/A Converter............................................................. 1bit DAC

Filter ........................................ 8-time oversampling digital filter

Wow & Flutter ....................................................Unmeasurable

Power Consumption........................................................140W

Dimensions (W X H X D)

GX-500............................................. 28 0 X 320 X 364m m

NX-GX500........................................ 20 0 X 320 X 218m m

Weight

GX-500............................................. 10.5kg (23 lbs. 2 oz)

NX-GX500....................................3.8kg (8 lbs. 6 oz)/each

Accessories ............................................ AM loop antenna X 1

(approx. 1W when set to the standby mode)

(11” X 12-5/8” X 14-5/16”)

(7-7/8” X 12-5/8” X 8-9/16”)

Indoor FM antenna X 1

Remote Control Transmitter X 1

Battery (size “AA”, R06) X 2

Speaker Cord X 2

* Specifications subject to change without notice.

(1/2")

343(13-1/2")

364(14-5/16")

GX-500/VCD

■ TAPE DECK SECTION

Type ..................................................................... Auto Reverse

4-Track 2-Channel playback/recording stereo Cassette Deck

Heads

REC/PB..................................................... Hard permalloy

Erase................................................... Double Gap Ferrite

Motors

Main ......................................................... DC servo motor

Tray Loading ...................................................... DC motor

Wow & Flutter

W.PEAK ................................................................. ±0.19%

W.RMS..................................................................... 0.09%

Frequency Response (–20dB)

Type I/Normal tape........................ 50 to 15,000Hz ± 3dB

Type II/High (CrO2) tape ............... 50 to 16,000Hz ± 3dB

S/N Ratio

NR off.........................................................................58dB

Dolby B NR on........................................................... 66dB

■ SPEAKER SECTION (NX-GX500)

Type ................................................. 3-Way Bass-reflex Design

(Magnetic-Shielding Type)

Speakers .................................................. 13cm (5-1/8”) woofer

5cm (1-15/16”) tweeter

2cm (13/16”) super tweeter

Frequency Range............................................. 60 to 20,000Hz

Maximum Input ................................................................240W

Impedance ............................................................................ 6Ω

Sound Pressure Level....................87dB/1m • 2.45V (1W/6Ω)

■ GENERAL

Power Supply

U, C models............................................... AC120V, 60Hz

A model...................................................... AC240V, 50Hz

B, G, L models........................................... AC230V, 50Hz

R, T models ..................... AC110/120/220/240V, 60/50Hz

100

(3-15/16")

172(6-3/4")

280(11")

* Manufactured under license from Dolby Laboratories Li-

censing Corporation. “DOLBY” and the double-D symbol V are trademarks of Dolby Laboratories Licensing Corporation.

(3/8")

320(12-5/8")

U ...................U.S.A. model G ............ European model

C ............. Canadian model R ............... General model

A ............Australian model L ............ Singapore model

B .................. British model T ....................China model

GX-500/GX-500VCD

■ INTERNAL VIEW

Top side

GX-500/VCD

e r

it y

q P.C.B. TUNER w P.C.B. MAIN (5) e P.C.B. MAIN (1) r P.C.B. INPUT (1) t P.C.B. MAIN (2) y P.C.B. MAIN (3) u P.C.B. MAIN (6) i DECK MECHANICAL UNIT

!3 t

y u

Left side

!1 !2q

!0o

o GX-500 P.C.B. INPUT (3)

GX-500VCD P.C.B. INPUT (2)

!0 GX-500 CD MECHANICAL UNIT

GX-500VCD VCD MECHANICAL UNIT

!1 GX-500 P.C.B. CD

GX-500VCD P.C.B. VCD (1)

!2 VCD MODULE (GX-500VCD only) !3 P.C.B. MAIN (4) (R, T only)

GX-500/GX-500VCD

■ DISASSEMBLY PROCEDURES (Remove par ts in the order as numbered.)

1. Removal of Top Cover

Remove 11 screws ( q ) in Fig. 1.

2. Removal of CD/VCD Mechanical Unit

a. Disconnect the power cord from the AC outlet. b. Push the Friction Arm ( the bottom side of the CD/

VCD Mechanical Unit ) with the Ejecting Tool or a tool like as shown in Fig. 2.

Ejecting Tool for CD Tray (TX946040)

Top Cover

CD/VCD Mechanical Unit

GX-500/VCD

c. Pull the Tray forward approx. 5cm ( 2" ) and remove

the CD Lid in Fig. 2. d. Push the Tray back to the original, closed position. e. Disconnect the Flat Connecting Cables ( CB9 ) and

remove 3 connectors ( CB8 , CB7 and CB10 ) in Fig. 2 f. Remove 4 screws ( w ) and then remove the CD

Mechanical Unit in Fig. 1.

3. Removal of Panel Unit

a. Rotate the Loading Gear, then open the Tray and

remove the Cassette Lid in Fig. 2. b. Push the Tray back to the original, closed position. c. Disconnect the flat connecting cables ( CB10, CB13

and CB11 ) and remove a connector ( CB805 ) in Fig.

d. Remove 6 screws ( e and r ) and then remove the

Panel Unit in Fig. 1.

Friction

Arm

FRONT

CB8 CB7

CB10 (GX-500VCD only)

Panel Unit

Fig. 1

4. Removal of Deck Mechanical Unit

a. Remove 4 screws ( t ) and then remove the Deck

Mechanical Unit in Fig. 3.

b. Remove 3 connectors ( W2, W3 and W4 ) in Fig. 3.

CB9

CB11 (GX-500VCD only)

CB13

CB10

Loading Gear

Fig. 2

CD Lid

CB805

Cassette Lid

Deck Mechanical Unit

Fig. 3

GX-500/GX-500VCD

5. Operation Check of P.C.B. CD/VCD

a. Remove the CD Mechanical Unit. b. Remove 4 screws ( y ) and then remove the P.C.B. CD/VCD in Fig. 4. c. Place blocks (at 3 locations) to hold the CD Mechanical Unit horizontally as

shown in the Fig. 5.

d. Connect the Flat Connecting Cable ( CB9 ) and 3 connectors ( CB8, CB7

and CB10 ) in Fig. 4 and Fig. 5.

e. Connect the power plug and turn on the Power Switch.

GX-500/VCD

VCD Module (GX-500VCD only)

P.C.B. CD/VCD

CB9

CB8 CB7 CB10

Fig. 4

P.C.B. CD/VCD

Block

Fig. 5

Block

GX-500/GX-500VCD

6. Operation Check of P.C.B. Main (1)

a. Remove the CD Mechanical Unit. b. Remove the Panel Unit. c. Remove the Deck Mechanical Unit. d. Remove 5 screws ( u ) in Fig. 6. e. Remove 1 screw ( i ) and then remove the P.C.B. Main (2) in Fig. 7. f. Remove 3 screws ( o ) in Fig. 7. g. Remove 4 screws ( !0 ) and then remove the Power Transformer in Fig. 8. h. Place the main unit on its left side (viewed from the front) and remove the Bottom Cover in Fig. 9. i. Install the Panel unit to the main unit in Fig. 9. j. Connect the flat connecting cables ( CB10, CB13 and CB11 ) and remove a connector ( CB805 ) in Fig. 2. k. Connect the power plug and turn on the Power Switch.

CAUTION

When the power to this equipment is turned on with the CD/VCD Mechanical Unit disconnected, the capacitor C255(4700/

16) of the Main P.C.B. (CD/VCD power supply section) is charged. Connecting the CD/VCD P.C.B. in this state may cause

damage to its IC. Therefore, when installing the CD/VCD Mechanical Unit, be sure to discharge the capacitor C255(4700/

16) of the Main P.C.B. before making connections. (To discharge it, short the W201 terminal +B and GND with a

resistor(270Ω 1W).)

P.C.B. Main (2)

GX-500/VCD

Fig. 6

Fig. 7

P.C.B. Input

Fig. 8

P.C.B. Main (1)

Fig. 9

GX-500/GX-500VCD

7. Removal of Tray & Traverse Unit

a. Remove 4 screws ( !1 ) and then remove the Clamp Bracket in Fig. 10. b. Remove 2 screws ( !2 ) and then remove the Tray Brackets in Fig. 10. c. Push the Friction Arm ( the bottom side of the CD Mechanical Unit ) with a screwdriver or the like and pull out the Tray

forward as in Fig. 10. d. Remove 4 screws ( !3 ) and take out the Slider in Fig. 11. e. Disconnect the Flat Connecting Cable ( 16P ) and connectors ( 6P ). f. Remove the Traverse Unit in Fig. 11.

GX-500/VCD

CD Mechanical Unit

Clamp Bracket

Tray

Tray Bracket

no marking

side

Slider

Spring

Traverse Unit

Guide Pin

Friction Arm

Tray Bracket

● Precaution for Installation of Tray

Be sure to fit the shaft of the Friction Gear into

the groove in the Tray.

Friction gear

Shaft

Groove

Tray

Fig. 10

Cam Gear

● Installation of Traverse Unit & Slider

Fig. 11

a. Fit the Traverse Unit into the Chassis. b. Turn the Cam Gear until its Guide Pin comes to the

position as shown in Fig. 11.

c. Fit the Slider into the Traverse Unit. Set the Spring of

the Slider so that it holds down the Guide Pin of the Cam Gear (as shown in Fig. B). (Press the Spring of the Slider once and release it, and it will hold down the Guide Pin of the Cam Gear.)

d. After installation, check that the Clamp moves up and

down by turning the Load Gear.

Cam Gear

Traverse Unit

Fig. A

FRONT

Spring

Guide Pin

Spring

Slider

Load Gear

Guide Pin

Fig. B

GX-500/GX-500VCD

8. Removal of Pick-up Head

a. Remove the Gear A in Fig. 12. b. Pull out the Sled Shaft and remove the Pick-up Head

in Fig. 12.

Pick-up Head

Sled Shaft

Stopper

Gear A

Fig. 12

9. Removal of Cassette Mechanism

Remove 4 screws ( !4 ) and then pull out the Cassette Mechanism in Fig. 13.

10. Removal of Main Motor

Remove 2 screws ( !5 ) in Fig. 13.

11. Removal of Pinch Roller

Detach the hook and then remove the Pinch Roller in Fig. 14.

12. Removal of Head Ass’y

a. Remove 1 screw ( !6 ) and then remove the Relay

P.C.B. in Fig. 14.

b. Remove 2 screws ( !7 ) and then remove the Head

Ass’y in Fig. 14.

* Perform the adjustment of azimuth after installing

the Head Ass’y.

GX-500/VCD

● Check that the disc table height is as specified

below.

Disc Table

19.4mm

Fig. C

Head Ass'y

Hook

Fig. 13

Hook

Pinch Roller (L)

!6!7 !7

Pinch Roller (R)

Fig. 14

GX-500/GX-500VCD

■ VOLUME RANGE

DISPLAY

VOL MIN VOL 01 VOL 02 VOL 03

GX-500/VCD

VOL 04 VOL 05 VOL 06 VOL 07 VOL 08 VOL 09

NOTE) When VOLUME is at minimum, MUTE of AMP is on.

– ∞ –79 –73 –68 –64 –61 –59 –58 –57 –56

DISPLAY

VOL 10 VOL 11

VOL 54 VOL 55

■ SYSTEM CONTROL CHECK

q FUNCTION AUX/MD is selected

CD PLAY KEY ON (remote control transmitter)

↓

w FUNCTION → CD ?

DISC No. display on?

yes

↓

CHECK OK

○○○○○○○○

–55 –54

1dB step

–11 –10

DISPLAY

VOL 56 VOL 57 VOL 58 VOL 59 VOL 60 VOL 61 VOL 62 VOL 63 VOL 64 VOL MAX

In case that CD doesn’t play : [RECEIVER → CD]

In case that DISPLAY doesn’t change : [CD → RECEIVER]

–9 –8 –7 –6 –5 –4 –3 –2 –1

(SYSCK, CDCE, SYSO) NG

(SYSI) NG

SYSCK: Pin 20 of IC8 CDCE: Pin 25 of IC8 SYSO: Pin 21 of IC8 SYSI: Pin 22 of IC8

■ TEST MODE

GX-500/GX-500VCD

To facilitate inspection, measurement and location of any faulty point, 6 types of built-in Test Mode are provided, one for each section.

• System Test Mode : Test mode for the system section. It is also used when entering the test mode for each section.

• Receiver Test Mode : Test mode for the receiver section

• Tape Test Mode : Test mode for the deck section

• CD Test Mode : Test mode for the CD section

• MD Test Mode : Test mode for the MD section (unused for this unit)

• All Function Test Mode : Test mode for all functions

■ SYSTEM TEST MODE

This test mode is used for the system section. Also, this mode must be executed first when entering the test mode for each section.

Starting Procedure

In the STANDBY mode, press the STANDBY/ON button while pressing the RANDOM button and the PLAY/ PAUSE(CD) button simultaneously. Once the SYSTEM TEST MODE is set, causal factors for the previous power off appear on the FL display.

Causal factors for power off at starting Display Description

<Key Operate Power off by button operation <Off Timer Power off by Off Timer setting <Sleep Timer Power off by Sleep Timer function <Auto Off Power off by Auto Power Off function <I-Protect Power off by detection of an abnormal current value <V-Protect Power off by detection of an abnormal voltage value <Temp Over Power off by detection of an abnormal temperature value <AC Cut Power off by AC power cut <?? Unknown

GX-500/VCD

Operation Procedure (Selection/finalizing of TEST MODE for each section)

1) Select the TEST MODE by the section name, pressing the wINPUT (up) or qINPUT (down) button.

Display Description Ref. page

<Key Operate Causal factors for power off are displayed. 14

(This state is available immediately after starting.) Test RECEIVER RECEIVER TEST MODE 15 Test TAPE TAPE TEST MODE 16 Test CD CD TEST MODE 17 Test MD MD TEST MODE (Unused for this unit) — Test All Func ALL FUNCTION TEST MODE 18 Escape Test The test mode is canceled. —

2) Pressing the MUSIC button will shift the mode to the selected test mode. For the details of the selected test mode, refer to the Ref. page in the above step 1).

GX-500/GX-500VCD

■ RECEIVER TEST MODE

When RECEIVER TEST MODE is set through SYSTEM TEST MODE, “01 G.E.TEST” appears on the FL display. (01 is the test program No.)

Test programs from 01 to 25 are incorporated in RECEIVER TEST MODE.

Operation Procedure (Selection/execution of Test Program)

GX-500/VCD

1) Select the test program by pressing the rTAPE (up) or eTAPE (down) button.

2) Pressing the STANDBY/ON button will execute the selected test program.

3) Repeat selection/execution of the test program as necessary.

No. & DISPLAY

01 G , E , TEST

02 FL + CLEAR

03 FL FULL

04 APO - ON/OFF 05 RDS - OFF/ON 06 A , PS - ON/OFF 07 A , M , - RDS/ALL 08 CT > C - ON/OFF 09 L > CT - ON/OFF 10 PSR2 - ON/OFF 11 RTBL - ON/OFF 12 SEC - OFF/ON 13 Temp 14 PEAK - ON/OFF 15 AMPC - OFF/ON 16 CDCH - ON/OFF 17 REM CODE 18 L , EN - ON/OFF 19 ALL CH > 20 RDS E / F 21 SUR TEST 22 KEYC - OFF/ON 23 AM - IF 24 CANCEL

25 DEST

FUNCTION

Equalizer check mode

FL display full lighting, RAM CLEAR

FL display full lighting

Do not use No. 04 to 23 functions as they are not for servicing.

Used to cancel the test program. (The product mode is restored when the STANDBY/ON button is pressed.) Destination display mode

Used to check EQ. Pressing the STANDBY/ON button will set the Equalizer Test mode. For the details, refer to page 16.

Used for lighting of all display segments and clearing of RAM. (Note that the user memory will be cleared.) At the first pressing of the STANDBY/ON button, all display segments light up and at the second pressing, MEMORY and M-CLEAR light up for 2 seconds and RAM of CPU is initialized. (The product mode is restored.) (Presetting of the tuner becomes the manufacturer preset state.)

Used to check lighting of all display segments. At the first pressing of the STANDBY/ON button, all display segments light up and at the second pressing, this mode is canceled. (The product mode is restored.)

PURPOSE & OPERATION

GX-500/GX-500VCD

Equalizer test mode (Test program No. 01)

When the equalizer test mode is set, “GEQ - xxx” is displayed. “xxx” represents the 3 band value of GEQ. It is possible to set the GEQ value directly, using the buttons on the remote control unit.

Example : To obtain flat

GEQ - 6 6 6

Low tone Intermediate tone High tone

Displayed value 0 123456789ABC Gain (dB) -12 -10 -8 -6 -4 -2 0 +2 +4 +6 +8 +10 +12

Operation Procedure

• To set a value for each band [ 0 ] to [ 9 ], [ A(TIME) ], [ B(PROG) ], [ C(R.TIME)]

• To set all bands to Min (-12dB) [ D(EDIT) ]

• To set all bands to Max (+12dB) [ E(+10) ]

• To cancel this test mode, press the STANDBY/ON button. (The production mode will be restored.)

GX-500/VCD

● MAKER’S PRESET

BAND

FM (MHz)

AM (kHz)

NOTE 1) PRESET PAGE ............................................ A : FM B : AM C : FM D : AM E : F M

U, C, R, T (100k/10k) A, B, G, L, R, T (50k/9k) U, C, R, T (100k/10k) A, B, G, L, R, T (50k/9k)

MARKETS

98.1

98.10 630 630

95.1

95.10 1080 1080

87.5

87.50 1400 1404

PRESET No.

101.5

101.50 530 531

107.9

108.00 1710 1611

88.1

88.10 900 900

106.1

106.10 1350 1350

107.9

107.90 1440 1440

CAUTION : When executing Test program No. 2 RAM CLEAR, be sure to write down the preset memory contents of the

tuner, using a table like the one shown below. Execution of RAM CLEAR will set the memory contents of the tuner back in the factory preset state which means that all the memories preset by the user will be erased.

Preset group

A B C D E

P1 P2 P3 P4 P5 P6 P7 P8

■ TAPE TEST MODE

When TAPE TEST MODE is set through SYSTEM TEST MODE, “Tape Test XXXX” appears on the FL display. (XXXX is the counter value.) The operation condition of the deck section will be as follows.

• When the reverse mode is set to “endless”, the number of playback repetition becomes unlimited. (It is set to “8 “ times in the product mode.)

• When in the REC mode, AUX/MD is used automatically for the input source.

GX-500/GX-500VCD

■ CD TEST MODE

When CD TEST MODE is set through SYSTEM TEST MODE, “00STM100: 00” appears on the FL display.

The CD TEST MODE is enabled. Each button operates as follows for each mode. The MODE No. is increased by pushing

"+10" button.

GX-500/VCD

Button

" 0 " " 1 "

" 2 "

" 3 "

" 4 "

" 5 "

" 6 "

" 7 "

" 8 "

" 9 "

Button

" 0 " " 1 " " 2 " " 3 " " 4 "

" 5 " " 6 " " 7 " " 8 " " 9 "

MODE 1 MODE 2 MODE 3

Open/close the tray Focus search Cancel adjust pass *2 Clamp up/down Play (PLL) Auto adjustment mode 1 *1

Tracking Offset, Focus Offset, Focus Gain

DISC change Play (without PLL) Auto adjustment mode 2 *1

Tracking Balance, Tracking Gain

Mechanism home process Focus on, Tracking off, Feed off Auto adjustment mode 3 *1

Focus Gain, Tracking Gain, Focus Balance

Jump to test mode 4 +10 track kick Read and display the servo

coefficient

Tray close, Clamp down –10 track kick Displayed servo coefficient

address up

— +1 track kick Displayed servo coefficient

address down Enter normal operation –1 track kick Displayed servo coefficient (without mecha. INIT.) increment Enter normal operation +30 track kick Displayed servo coefficient

decrement Start TEST REPEAT –30 track kick Send the displayed servo (Do not use this function as coefficient *2 it is not for servicing.)

MODE 4 MODE 5 (GX-500VCD only)

Feed forward (outer direction) CD-ROM module load Feed backward (inner direction) CD-G module load Rotate the disc motor Decoder play command Retard the disc motor Decoder pause command port TBLL ← Low, Decoder abort command port TBLR ← High port TSLW High/Low alternate Decoder soft reset Tray port control (open/close) Decoder hard reset Line mute on/off — —— Jump to Test mode 1 —

*1 “Adj-” lights during the

adjustment and disappears at the end of the adjustment.

*2 When the mode is reset to the

Production Mode after the servo coefficients are renewed by this operation, auto adjustment is not available unless the auto adjustment pass function is cancelled.

The following button functions are not changed in the test mode No.

OPEN/CLOSE

DISC CHANGE

a (STOP)

w / d

(PLAY/PAUSE)

y t

DISC 1

[VCD Module condition check]

If the VCD module is in a good condition, the blue background appears on the monitor screen when in the CD test mode. If the blue background does not appear, the possibility is that the VCD module has failed. NOTE: None of the components of the VCD module can be supplied separately. Only a VCD module unit (VZ150200) is available.

Open/close the tray Clamp up/down Controls for the tray, the disc table and clamping stop. STANDBY command for the servo system. Play (PLL)

Feed forward (outer direction) Feed backward (inner direction) Tray close, clamper down

■ ALL FUNCTION TEST MODE

GX-500/GX-500VCD

When ALL FUNCTION TEST MODE is set through SYSTEM TEST MODE, “AUX Digital” appears on the FL display.

The operation condition in this mode will be as follows.

• AUX/MD is used as the input source of the receiver section, which is then set to the Dolby Pro Logic mode (GX500VCD only).

• When a CD is loaded, Full Repeat Play is executed automatically for it.

• When a cassette tape is loaded, Endless Rec Play is executed by the cassette deck automatically.

■ CD ERROR MESSAGES

Error message can be obtained on the display by pushing STOP and TIME buttons simultaneously when CD has stopped (sometimes with the tray open) by an error.

INDICATION

E-10 E-20 E-30 E-70 E-11 E-21 E-31 E-73 E-04 E-14 E-35 E-06 E-47 E-57 E-77 E-18 E-28 E-38 E-48

E-68 E-AA E-AB E-AC E-AD E-AE E-AF

MN ERR

PLAY SCAN PAUSE SEARCH PLAY SCAN PAUSE SEARCH LOAD, SEARCH LOAD, SEARCH

SEARCH, PLAY, PAUSE SEARCH STOP LOAD, EJECT, CHANGE PLAY SCAN PAUSE SEARCH LOAD, DISC CHANGE

STATE

CONTENTS OF ERROR

   

CD fails in the disc data reading after the state shift.

  

  

CD fails in the disc data reading.

 

CD fails in the TOC data reading. Tracking servo is not effective at the disc motor servo PLL. Disc motor servo PLL is not effective. CD fails in focus search. CD fails in escaping from the lead-in area.

  

The inner limit switch does not operate at the feed inner control.

 

   

CD fails in recovery from the focus out.

   

Clamp down switch does not operate at the clamp down control. Clamp up switch does not operate at the clamp up control. Close switch does not operate at the tray close control. Open switch does not operate at the tray open control. CD fails in the table control. CD fails in the mecha. home process. MN662741 does not give response of SENSE with resetting by the units microcomputer.

GX-500/VCD

When "MECHA ER" message appears on the display; Possible symptoms are, the clamp does not move up or down, the table does not turn, mecha. sensor switch malfunctions, etc. The normal operation may be restored by tuning off the power once and then on again. If it does not work in this way, disassemble the CD mechanical unit and investigate the cause of the failure.

GX-500/GX-500VCD

■ CD STANDARD OPERATION CHART

Press OPEN/CLOSE key.

Forced feed return operation.

GX-500/VCD

Tracking Offset auto ADJ. (only POWER ON)

Focus Offset auto ADJ. (only POWER ON)

Press PLAY key or push the tray.

Disc mechanism unit clamped up.

Feed inward switch research.

Clamp down operation.

Disc table reset.

Tray open.

Load a disc in “DISC 1”.

Tray closed. Table rotate.

Disc research.

“OPEN” appears in the TIME indicator.

“TRV” signal is output until detection of LIMIT switch.

DISC “1” is turned to DM clamp position.

Laser ON.

Disc scan.

FOCUS Gain rough ADJ.

FOCUS Search operation.

FOCUS LOCK servo ON.

Spindle motor accelerated.

TRACKING servo ON.

Disc servo ON

VCO lock.

Tracking Gain rough ADJ.

Tracking Balance ADJ. (only Tray OPEN/CLOSE)

FOCUS BALANCE ADJ.

FOCUS GAIN ADJ.

LDON = “H” (IC5, 40 pin)

FLOCK = “H” → “L” (IC11, 8 pin)

TLOCK = “H” → “L” (IC11, 11 pin)

TRACKING GAIN ADJ.

GX-500/GX-500VCD

* TOC READ

After searching the beginning, MUTE is cancelled.

Set to SEARCH by means of Y, T key.

After searching the beginning, MUTE is cancelled.

* ~ Data fetch cycle ~

TRACK No. “1” is searched.

~ PLAY ~

MUTE ON.

TRACK search.

~ PLAY ~

Press the STOP key.

MUTE ON.

Spindle motor stop.

GX-500/VCD

: MUTE = “L” → “H”, “0:00” appears in the time indicator. (IC11, 64 pin)

: MUTE = “H” → “L”

: MUTE = “L” → “H”, “0:00” appears in the time indicator.

Laser OFF.

Forced feed return.

~ STOP ~

: LDON = “H” → “L” (IC5, 40 pin)

: FLSW = “L” (IC11, 26 pin)

GX-500/GX-500VCD

● CLOSE operation● HOME operation

LOAD MOTOR reverse rotate

LOAD SW

GX-500/VCD

TIMER 10ms

LOAD SW

LOAD MOTOR forward rotate

LOAD SW

TIMER 10ms

LOAD SW

LOAD MOTOR STOP

Start

OFF ?

ON ?

YES

Start

10sec timer start

LOAD MOTOR forward rotate

LOAD SW

ON ?

YES

TIMER 10ms

LOAD SW

ON ?

YES

LOAD MOTOR STOP

END

10sec timer

time up ?

YES

LOAD MOTOR STOP

To OPEN operation

END

● OPEN operation

Start

10sec timer start

LOAD MOTOR reverse rotate

UNLOAD SW

OFF ?

YES

TIMER 10ms

UNLOAD SW

OFF ?

YES

LOAD MOTOR STOP

10sec timer

time up ?

YES

LOAD MOTOR STOP

ERROR

● DOWN operation

Start

10sec timer start

LOAD MOTOR forward rotate

DOWN SW

ON ?

YES

TIMER 10ms

DOWN SW

ON ?

YES

END

10sec timer

time up ?

YES

LOAD MOTOR STOP

ERROR

END

● ROTARY TRAY initialization operation

GX-500/GX-500VCD

Start

10sec timer start

ROTARY MOTOR forward rotate

POSITION SW

OFF ?

YES

Timer 20ms

POSITION SW

OFF ?

YES

POSITION SW

ON ?

YES

Timer 20ms

POSITION SW

ON ?

YES

DISC NO. count

10sec timer

time up ?

ROTARY MOTOR STOP

ERROR

10sec timer

time up ?

GX-500/VCD

YES

STOP SW

OFF ?

YES

DISC

NO. 3 ?

YES

ROTARY MOTOR retard

STOP SW

ON ?

YES

ROTARY MOTOR 32ms back pluse

ROTARY MOTOR STOP

STOP SW

ON ?

YES

Overrun count clear

DISC NO. clear

Timer 60ms

STOP SW

ON ?

POSITION SW

OFF ?

YES

10sec timer

time up ?

YES

Overrun count

Overrun

count = 3 ?

YES

ERROR

END

GX-500/GX-500VCD

■ ADJUSTMENTS (DECK SECTION ONLY)

1. Before adjustment

● Since head magnetization, dust accumulations, etc.

are likely to introduce error in the various characteristics, it is very important that the heads are properly demagnetized and cleaned.

● Make adjustments of mechanical system, playback

GX-500/VCD

system and recording system in that order.

● Except for azimuth adjustment, adjust in the forward

direction.

● Adjust at TAPE TEST MODE.

2. Instruments required

● Audio frequency oscillator

● ACVM or dual channel (ACVM)

● DCVM

● Wow/flutter meter

● Oscilloscope

● Frequency counter

● Torque meter

TW-2111A (TX911580) ... Take up/back tension (FWD)

TW-2121A (TX911570) .... Take up/back tension (RVS)

CT-160L (TX911120) .................................. FF/REW

3. Test tape required

●

MTT-111N (TX911650) ........................... Normal speed

● MTT-114N (TX911680) ................................ Azimuth

● MTT-212N (TX911660) ...................... Playback level

● MTT-256 (TX911300)................ Playback frequency

response (Normal)

● MTT-356 (TX911310)................ Playback frequency

● Reference tape

Type

I/Normal (LH).......... TDK AC225 (VU167200)

Type

II /High (CrO2) ......... TDK AC514 (VU167300)

response (CrO

● Test point

REC LEVEL ADJ.

TAPE SPEED ADJ.

(

)

Lch

(

)

Rch

PB LEVEL ADJ.

(

)

Lch

PB LEVEL ADJ.

(

)

Rch

VR7

VR4 VR1

VR6 VR5

IC6

VR3 VR2

BIAS ADJ.(Lch

)

BIAS ADJ.(Rch

)

“MECHANICAL ADJUSTMENT”

Item to be

Step

Check each

Adjusted

torque

Check FF, REW

take up time Azimuth

Tape Speed

Wow/Flutter

Tape

CT-160L (FF, REW) TW-2111A (FWD)

TW-2121A (RVS)

AC-514 (C-60)

MTT-114N 10kHz, –10dB

MTT-111N 3kHz, –10dB

Instrument

required

Torque meter

ACVM Oscilloscope

Frequency counter

Wow/flutter meter

Mode

FF REW

PLAY

FF REW

PLAY

Adjustment

part

Azimuth adjustment screw. (Fig. A)

VR7

GX-500/GX-500VCD

Rating

FF, REW torque : within 70 ~ 160g/cm. Take up torque : 30 ~ 70g/cm. Back tension : 1.5 ~ 6g/cm. 80 to 120 seconds.

Playback output of L and R is maximum and phase difference should be minimum both directions. (Fig. B)

3000Hz ± 15Hz

Less than 0.19% (WRMS)

After the adjustment make sure to apply screw lock paint.

Perform adjustment at the center of the test tape, if possible.

Confirm at center of the test tape, if possible.

Remarks

GX-500/VCD

Azimuth adjustment screw. (FORWARD)

Azimuth adjustment screw. (REVERSE)

Fig. A

“ELECTRICAL ADJUSTMENT”

● Use 560 mV (250 nwb/m) for 0 dB as the standard level of the unit.

0dB = 250 nwb/m (315 Hz) = – 7 dBV (Rec out level)

< Playback section >

Step

Item to be

Adjusted

Playback

level (315Hz)

MTT-212N 315Hz, 250nwb/m

Tape

Instrument

required

ACVM

Mode

PLAY

Points of

measurement

REC OUT

Rec out L : ch 1 Rec out R : ch 2 DC input, X-Y (Resurge) mode

0.2V

Fig. B

Adjustment

parts

VR4 (L ch) VR1 (R ch)

0.2V

Rating

– 7 dBV ± 0.3 dBV

Confirmation of

playback frequency

response

Test tape for frequency check. 3180µs + 120µs (LH) (MTT-256) 3180µs+70µs (CrO2) (MTT-356)

● PLAYBACK FREQUENCY RESPONSE

± 3dB

± 4dB

3k 10kHz31525050 12.5kHz

± 3dB

ACVM Oscilloscope

± 3.5dB

Fig. C

PLAY

REC OUT

Check that the 10kHz playback level is within 0 ± 3 dB of the 1kHz playback level. (Fig. C)

GX-500/GX-500VCD

< Recording section >

Item to be

Step

Adjusted

Recording

level

GX-500/VCD

Recording

bias (Total frequency response)

Confirmation

of recorded level

Tape

AC-514 High (CrO2)

AC-225 Normal (LH)

AC-514 High (CrO2)

Instrument

required

ACVM Audio frequency oscillator

Mode

REC PLAY

Measurement

conditions

Input 1 kHz Signal to AUX IN from Audio Frequency Oscillator. Adjust output level of Audio Frequency Oscillator so that the voltage of REC OUT becomes – 27 dBV.

Input 12.5 kHz Signal to AUX IN from Audio Frequency Oscillator. Adjust output level of Audio Frequency Oscillator so that the voltage of REC OUT becomes – 27 dBV.

Points of

measurement

REC OUT

Adjustment

parts

VR6 (L ch) VR5 (R ch)

VR3 (L ch) VR2 (R ch)

Rating

Adjust for equal record and playback levels. (– 27 dBV ± 0.3 dBV)

Adjust for equal record and playback levels. (Fig. D) Perform record bias adjustment of High (CrO2) tape again, if the rating was not satisfied.

Confirm recorded level rating as in step 1 When recorded level rating is improper, go back to step 1 and also carry out adjustments in step 2 again.

● TOTAL FREQUENCY RESPONSE ( – 27 dBV)

Dolby NR B & OFF Type I (Normal)/Type II (High)

± 4dB

± 5dB

± 3dB

3k 10kHz31525050 12.5kHz

± 5dB

Fig. D

+ 60 hidden pages

Yamaha GX-500-VCD Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

■ TO SERVICE PERSONNEL

■ GX-500 PANELS

■ GX-500VCD PANELS

■ SPECIFICATIONS

■ INTERNAL VIEW

■ DISASSEMBLY PROCEDURES (Remove par ts in the order as numbered.)

■ VOLUME RANGE

■ SYSTEM CONTROL CHECK

■ TEST MODE

■ SYSTEM TEST MODE

■ RECEIVER TEST MODE

■ TAPE TEST MODE

■ CD TEST MODE

■ ALL FUNCTION TEST MODE

■ CD ERROR MESSAGES

■ CD STANDARD OPERATION CHART