Hitachi HTADD-3-EBS, HTADD-3-E, HTADD-3-W, HTADD-3-WAU, HTADD-3-WUN Service manual

SERVICE MANUAL MANUEL D'ENTRETIEN WARTUNGSHANDBUCH

CAUTION:

Beforeservicing this chassis, itisimportantthat the servicetechnician read the“Safety Precautions”and“ProductSafetyNotices”inthisservicemanual.

SM0103

HTADD3E HTADD3EBS HTADD3W HTADD3WUN HTADD3WAU

Data contained within this Service manual is subject to alteration for improvement.

ATTENTION:

Avantd’effectuerl’entretienduchâassis,letechniciendoitlireles«Précautionsdesécurité» etles«Noticesdesécuritéduproduit»présentésdansleprésentmanuel.

VORSICHT:

VorÖffnendesGehäuseshatderService-Ingenieurdie„Sicherheitshinweise“und„Hinweise zurProduktsicherheit“indiesemWartungshandbuchzulesen.

CONTENTS

SPECIFICATIONS...............................................................................................................................................3

SERVICE POINTS..............................................................................................................................................4

ADJUSTMENT.....................................................................................................................................................8

WIRING DIAGRAM.............................................................................................................................................9

PRINTED WIRING BOARD..............................................................................................................................10

BLOCK DIAGRAM.............................................................................................................................................23

SCHEMATIC DIAGRAM....................................................................................................................................25

EXPLODED VIEW.............................................................................................................................................43

REPLACEMENT PARTS LIST..........................................................................................................................47

Les données fournies dans le présent manueld’entretienpeuventfairel’objet demodificationsenvuedeperfectionner leproduit.

Die in diesem Wartungshandbuch enthaltenenSpezifikationenkönnensich zwecksVerbesserungenändern.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

AV SURROUND SYSTEM

September 2000

ENGLISH

SAFETY PRECAUTIONS

WARNING: The following precautions must be observed.

ALL PRODUCTS

Before any service is performed on the chassis an isolation transformer should be inserted between the power line and the product.

1. When replacing the chassis in the cabinet, ensure all the protective devices are put back in place.

2. When service is required, observe the original lead dressing. Extra precaution should be taken to ensure correct lead dressing in any high voltage circuitry area.

3. Many electrical and mechanical parts in HITACHI products have special safety related characteristics. These characteristics are often not evident from visual inspection, nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified by marking with a

 on the schematics and the replacement parts list. The use of a substitute replacement component that does not have the same safety characteristics as the HITACHI recommended replacement one, shown in the parts list, may create electrical shock, fire, X-radiation, or other hazards.

4. Always replace original spacers and maintain lead lengths. Furthermore, where a short circuit has occurred, replace those components that indicate evidence of overheating.

5. Insulation resistance should not be less than 2M ohms at 500V DC between the main poles and any accessible metal parts.

6. No flashover or breakdown should occur during the dielectric strength test, applying 3kV AC or

4.25kV DC for two seconds between the main poles and accessible metal parts.

7. Before returning a serviced product to the customer, the service technician must thoroughly test the unit to be certain that it is completely safe to operate without danger of electrical shock. The service technician must make sure that no protective device built into the instrument by the manufacturer has become defective, or inadvertently damaged during servicing.

CE MARK

1. HITACHI products may contain the CE mark on the rating plate indicating that the product contains parts that have been specifically approved to provide electromagnetic compatibility to designated levels.

2. When replacing any part in this product, please use only the correct part itemised in the parts list to ensure this standard is maintained, and take care to replace lead dressing to its original state, as this can have a bearing on the electromagnetic radiation/immunity.

PICTURE TUBE

1. The line output stage can develop voltages in excess of 25kV; if the E.H.T. cap is required to be removed, discharge the anode to chassis via a high value resistor, prior to its removal from the picture tube.

2. High voltage should always be kept at the rated value of the chassis and no higher. Operating at higher voltages may cause a failure of the picture tube or high voltage supply, and also, under certain circumstances could produce X-radiation levels moderately in excess of design levels. The high voltage must not, under any circumstances, exceed 29kV on the chassis (except for projection Televisions).

3. The primary source of X-radiation in the product is the picture tube. The picture tube utilised for the above mentioned function in this chassis is specially constructed to limit X-radiation. For continued X-radiation protection, replace tube with the same type as the original HITACHI approved type

4. Keep the picture tube away from the body while handling. Do not install, remove, or handle the picture tube in any manner unless shatterproof goggles are worn. People not so equipped should be kept away while picture tubes are handled

LASERS

If the product contains a laser avoid direct exposure to the beam when the cover is open or when interlocks are defeated or have failed.

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HTA-DD3

Check that exposed parts are acceptably insulated from the supply circuit before returning the repaired instrument to the customer.

INSTRUMENT

• Checking method

(Exposed part)

Measure the resistance value between the both poles of attachment cup (Power supply plug) and the exposed parts (Parts such as Knob, Cover, etc. where the customer is easy to touch.) and check that the resistance value is 500 kohms or more.

Insulation tester (DC 500V)

SAFETY PRECAUTIONS

The following precautions should be observed when servicing.

1. Since many parts in the unit have special safety-related characteristics, always use genuine Hitachis replacement parts. Especially critical parts in the power circuit block should not be replaced with other makers. Critical parts are marked with

2. Before returning a repaired unit to the customer, the service technician must thoroughly test the unit to ascertain that it is completely safe to operate without danger of electrical shock.

_ in the circuit diagram and printed wiring board.

 2 

HTA-DD3

SPECIFICATIONS

 AUDIO SECTION

(Power amplifier) For (E, EBS) For (W, WUN, WAU) Rated output: Front: 80 W + 80 W (6 Ω/ohms, 20 Hz ~ 20 kHz with 0.1 % T.H.D.) 100 W + 100 W (EIAJ, 6 ohms)

SINUS power: Front: 90 W + 90 W (6 Ω/ohms, 1 kHz, 0.1 %)

Output terminals: Front: A or B 6 to 16 Ω/ohms

(Analog)

LINE input Input sensitivity / input impedance: 200 mV / 47 kΩ/kohms Frequency response: 10 Hz ~ 50 kHz: +1, 3 dB S/N ratio: 93 dB (IHF-A weighted) Total harmonic distortion: 0.1% (20 Hz ~ 20 kHz)

PHONO input-REC OUT

Input sensitivity / input impedance: 2.5 mV / 47 kΩ/kohms RIAA deviation: ±1 dB (20 Hz ~ 20 kHz) S/N ratio: 74 dB (IHF-A weighted, with 5mV input) Total harmonic distortion: 0.03% (1 kHz, 3V) Rated output / Maximum output: 150 mV / 7V

Centre: 80 W (6 Ω/ohms, 20 Hz ~ 20 kHz with 0.1 % T.H.D.) 100 W (EIAJ, 6 ohms) Surround: 80 W + 80 W (6 Ω/ohms, 20 Hz ~ 20 kHz with 0.1 % T.H.D.) 100 W + 100 W (EIAJ, 6 ohms)

Centre: 90 W (6 Ω/ohms, 1 kHz, 0.1 %) Surround: 90 W + 90 W (6 Ω/ohms, 1 kHz, 0.1 %)

A + B 12 Ω/ohms or more

Center/Surround: 6 to 16 Ω/ohms

•VIDEO SECTION

(Composite)

Input/output level and impedance: 1 Vp-p, 75 Ω/ohms Frequency response: 5 Hz ~ 10 MHz +1, 3 dB

(S-Video)

Input/output level and impedance: Y=1 Vp-p, C=0.286 Vp-p Frequency response: 5 Hz ~ 10 MHz +1, 3 dB

(Component)

Input/output level and impedance: Y=1 Vp-p, C Frequency response: 5 Hz ~ 10 MHz +1, 3 dB

•TUNER SECTION

[FM] (note: µV at 75Ω/ohms, 0 dBF = 1 ∞ 10

Receiving range: 87.50 MHz ~ 108.00 MHz (0.05 MHz step) 522 kHz ~ 1611 kHz (9 kHz step) (E, EBS)

Usable sensitivity: 2.0 µV (17.2 dBf) 600 µV 50 dB quieting sensitivity: STEREO 23µV (38.5 dBf) S/N ratio: MONO 80 dB (IHF-A weighted)

STEREO 75 dB (IHF-A weighted)

Total harmonic distortion: MONO 0.2% (1kHz)

STEREO 0.4% (1kHz)

=0.7 Vp-p, CR=0.7 Vp-p

-15

W) [AM]

522 kHz ~ 1611kHz (9 kHz step), 520 ~ 1710 kHz (10 kHz step) (W, WUN,WAU)

• GENERAL

Power supply: AC 230V, 50 Hz (E,EBS), AC 110 ~ 127V/220 ~ 240V, 50/60 Hz (W, WUN,WAU) Power consumption: 180 W (Standby mode = 1.5W) Maximum external dimensions: 434 (W) ∞ 144 (H) ∞ 320 (D) mm Weight: 8.1 kg

• REMOTE CONTROL UNIT (RB-DD1S)

Batteries: R6P/AA Type (two batteries) External dimensions: 54 (W) ∞ 172 (H) ∞ 27.2 (D) mm Weight: 100 g (including batteries)

• Accessory supplied: Operating instructions, Remote control unit (RB-DD1S),

* For purposes of improvement, specifications and design are subject to change without notice.

R6P/AA batteries, AM loop antenna and FM indoor antenna

 3 

HTA-DD3

SERVICE POINTS

1. Removal of Top Cover

(a) Remove 2 screws 1 from each side. (b) Remove 4 screws 2 from the rear plate.

x 2

Top cover

x 2

x 4

Fig.1

2. Removal of Rear Plate

(a) Remove 28 screws 3 and 1 screw 4 from the rear plate. (b) Remove 5 screws - from the Bottom Chassis.

Rear Plate

x 28

x 5

Fig.2

 4 

x 1

3 . Removal of Tuner & DSP PWB board

(a) Remove the Push Rivet from the Holder (Front) & Holder (Back) then remove the flat cable Z at the Tuner PWB. (b) Remove 1 screw + to detech the shield plate from the bottom chassis. (c) Gently pull the Tuner & DSP PWB board upwards to detach its connectors A, B, C, D, E & F from Main

PWB board.

Removal of Audio PWB board (a) Gently pull the Audio PWB board upwards to detach its 4 connectors H, I, J & K from Main PWB board. Removal of S Video/Composit PWB board

(a) Gently pull the Composit and S Video PWB board upwards to detach its 2 connectors L & M from Main PWB

board.

Removal of Components PWB board (a) Gently pull the Components PWB board upwards to detach its connector N from Main PWB board.

P Q

Removal of Relay PWB board

(a) Gently pull the Relay PWB board upwards to

detach its 3 connectors O, P & Q from Main PWB board.

DSP PWB

Push Rivet

for E, E(BS)

DSP PWB

Fig.3

HTA-DD3

Holder (Front)

SHIELD

Main PWB

Holder (Back)

4. Removal of Transformer

(a) Remove 4 screws 5 from the transformer. (b) Pull the transformer upward together with the Power PWB section.

PLATE

x 1

Tuner

PWB

S Video PWB

Audio PWB

Relay PWB

Component PWB

Composit PWB

Removal of Power PWB board

(a) Remove 1 screw 6 from the Botton chassis at the side. (b) Release the Power PWB board from its 3 holding claws (PWB support) and gently pull the board free.

Removal of Main PWB board

(a) Detach Flat Cable from FL PWB Board. (b) Remove 4 screws 7 to release the Power IC from the heat-sink. (c) Remove 3 screws , to release the bracket from the heat-sink. (d) Remove 1 screw 8 to release the Component from the heat-sink.

Removal of Heat-Sink

x 4

(a) Invert the Botton Chassis, remove 2 screws

9 connect to the heat-sink (Fig 5).

Flat Cable

x 1

Claws (PWB Support)

x 1

Fig.4

x 4

 5 

x 3

HTA-DD3

5. Removal of Front Panel

(a) Invert the Bottom Chassis and remove 4 screws !. (b) Remove the Master Vol. & Bass/Treble knob before remove the Front panel.

x 2

x 1

Bottom Chassis

x 4

Front Panel

Bass/Treble Knob

Master V ol.

Fig.5

6. Removal of Inner Panel, Power Switch, Phone Jack & FL board.

(a) Release the inner panel from the bottom chassis by remove 1 screw " (Fig 5) and 2 screws #. (b) Remove 11 screws $ and 3 nuts to release the FL board. (c) Remove 2 screws % to release the Power switch. (d) Remove 2 screws & to release the Phone Jack.

Nut x 2

x 1

x 2

Inner Panel

x 1

Nut x 1

Fig.6

 6 

x 11

x 2

7. Removal of Foot (a) Remove 4 screws ( to remove foot.

HTA-DD3

x 4

Fig.7

 7 

HTA-DD3

ADJUSTMENTS

1) FM Discriminator Measuring instrument and condition.

Input terminal Output terminal Measuring instrument Frequency Adjust Reading

FM antenna * R22 DC balance meter 98.1 MHz T4 0±30mV 1kHz, 60dBu,

22.5kHz dev.

* R22

DC balance meter

2) Voltage of covering (Reference)

Band Destination Frequency Specification Note

Limit(V) Average(V)

FM E/EBS 87.50MHz 1.3-3.7 2.4

(50kHz step) 108.00MHz 6.0-9.0 7.5

W/WUN/WAU 87.50MHz 1.3-3.7 2.4

(50kHz step) 108.00MHz 6.0-9.0 7.5

AM E/EBS 522kHz 0.9-1.2 1.1

(9kHz step) 1,611kHz 6.0-9.0 7.5

W/WUN/WAU 522kHz 0.9-1.2 1.1

(9kHz step) 1,611kHz 6.0-9.0 7.5

3) Tuning level (dB) adjusment

Input  FM antenna, 1 KHz, 26 dBµV, 75 KHz Adjust  VR1 Limit  26±2dB

(NOTE) Adjust VRI until "Tuned" Indicator light on.

 8 

WIRING DIAGRAM

HTA-DD3

CN12

CN14

CN206

CN201A

DIGITAL IN. UNIT

VIDEO(C)IN. UNIT

VIDEO(S)IN. UNIT

PG206

CN1BCN2A

CN1A

DSP UNIT

PG205

W17A W15A

W16A W18A W14A

W19A W13A

CN1B

CN201

CN2B

FL DISPLAY UNIT

TUNER/VOL UNIT

CN204

AUDIO IN. UNIT

CN204A

PG14

VIDEO(COMP.)IN. UNIT

MAIN UNIT

SPEAKER OUT. UNIT

PG13

PG22

CN205

CN22

THERMAL

UNIT

REMARKS * SHOULD BE FOLLOW PWB ASS'Y.

W1A

W3A

W10A W9A W8A

W6A W7A

W3B

*VOLTAGE SELECTOR

(for W, WUN, W A U)

W1B W2B

PG25

W2A

POWER CORD

POWER CONTROL UNIT

PG12

*CN15

W5B W7B W9B W6B W8B

W4B

W10B

POWER T .(Pry .) UNIT

POWER T .(2nd) UNIT

W19B W18B W17B W16B W15B W14B W13B

PG3

CN13

*PG15

CN3

PHONES/SPEAKER SW UNIT

POWER SW UNIT

 9 

HTA-DD3

PRINTED WIRING BOARD

Soldering Side

MAIN PWB

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