Hitachi CM721FET, CM715FET Schematic

SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH

CAUTION:

Before servicing this chassis, it is important that the service technician read the “Safety
Precautions” and “Product Safety Notices” in this service manual.

No. 0410

CM721FET

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

ATTENTION:

Avant d’effectuer l’entretien du châassis, le technicien doit lire les «Précautions de sécurité»
et les «Notices de sécurité du produit» présentés dans le présent manuel.

VORSICHT:

Vor Öffnen des Gehäuses hat der Service-Ingenieur die „Sicherheitshinweise“ und „Hinweise
zur Produktsicherheit“ in diesem Wartungshandbuch zu lesen.

Les données fournies dans le présent
manuel d’entretien peuvent faire l’objet
de modifications en vue de perfectionner
le produit.

Die in diesem Wartungshandbuch
enthaltenen Spezifikationen können sich
zwecks Verbesserungen ändern.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

MONITOR

December 2001

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.

FRANÇAIS

CONSIGNES DE SECURITE

AVERTISSEMENT: vous devez respecter les précautions suivantes

POUR TOUS LES PRODUITS

Avant d’effectuer une intervention d’entretien sur le
châssis, vous devez insérer un transformateur d’isolement
entre la ligne d’alimentation électrique et le produit.

1. Lors de la remontage du châssis dans le coffret,
vérifiez que tous les dispositifs de protection sont
remis en place.

2. Lorsqu’une intervention d’entretien s’avère
nécessaire, respectez l’agencement d’origine des
conducteurs. Vous devez prendre des précautions
supplémentaires pour garantir un agencement correct
des conducteurs dans toutes les zones où des circuits
haute tension sont présents.

3. De nombreux composants électriques et mécaniques
des appareils HITACHI ont des caractéristiques
spéciales de sécurité. Bien souvent, ces
caractéristiques ne sont pas évidentes lors d’un
examen visuel et la protection qu’ils offrent n’est pas
forcément garantie si vous utilisez des composants de
rechange conçus, par exemple, pour une tension plus
élevée, une puissance plus forte. Les pièces de
rechange qui offrent des caractéristiques spéciales de
sécurité sont identifiées par un repérage comportant

le symbole ! sur les schémas et sur la
nomenclature des pièces de rechange.
L’emploi d’un composant de rechange qui ne
respecte pas les mêmes caractéristiques de sécurité
que la pièce de rechange que recommande HITACHI
et qui figure dans la nomenclature risque de
provoquer un choc électrique, un incendie, des rayons
X ou d’autres dangers.

4. Remettez toujours en place les entretoises d’origine
et respectez la longueur des conduites. En outre, à la
suite d’un court-circuit, remplacez les composants
présentant des signes de surchauffe.

5. La résistance d’isolement doit être supérieure ou
égale à 2 méga ohms à 500 V c.c. entre les pôles
principaux et des composants métalliques
accessibles, quels qu’ils soient.

6. Aucun claquage et aucune rupture ne doit se produire
pendant l’essai de résistance diélectrique à la suite de
l’application d’une tension de 3 kV c.a. ou de 4,35
kV c.c. pendant deux secondes entre les pôles
principaux et des composants métalliques
accessibles.

7. Avant de remettre au client un produit qui a fait
l’objet d’un entretien, le technicien qui s’est chargé
de cette intervention doit tester à fond cet ensemble
pour s’assurer qu’il ne présente aucun danger
opérationnel et aucun risque de choc électrique. Ce
technicien doit s’assurer qu’aucun des dispositifs de
protection intégrés à cet instrument par le fabricant
n’est défectueux ou n’a été endommagé de façon
accidentelle lors de l’entretien.

LABEL CE

1. Les produits HITACHI peuvent avoir reçu le label
CE qui figure sur la plaque signalétique pour indiquer
que cet ensemble contient des composants qui ont fait
l’objet d’une homologation spécifique de respect des
normes de compatibilité électromagnétique en
fonction de niveaux bien spécifiés.

2. Lors du remplacement d’un des composants de ce
produit, utilisez uniquement le composant correct
identifié dans la nomenclature afin de maintenir le
respect de cette norme ; en outre, vous devez
également ramener l’agencement des conducteurs à
son état d’origine car cela peut avoir une influence au
niveau des rayonnements électromagnétiques et sur la
protection contre ces rayons.

PICTURE TUBE

1. L’étage de sortie des lignes peut développer des
tensions de plus de 25 kV ; s’il faut retirer le chapeau
de protection contre les tensions extrêmement
élevées, il convient de décharger l’anode contre le
châssis par le biais d’une résistance de forte valeur
avant de déposer ce chapeau du tube image.

2. La haute tension doit toujours se maintenir à la valeur
nominale du châssis et ne pas dépasser cette dernière.
Un fonctionnement à des températures élevées peut
provoquer une défaillance du tube image ou l’entrée
d’une tension élevée. Dans certains cas, cela peut
même provoquer des rayons X d’un niveau
légèrement supérieur aux valeurs de calcul. Cette
haute tension ne doit en aucun cas dépasser 29 kV sur
le châssis (à l’exception des téléviseurs de
projection).

3. La principale source de rayons X de cet appareil est
le tube image. Le tube image employé pour assurer la
fonction susmentionnée dans ce châssis est
spécialement construit pour limiter des rayons X.
Pour maintenir cette protection contre les rayons X, il
faut remplacer le tube d’origine d’un type agréé par
HITACHI par un autre tube de même type.

4. Lors des manipulations, ne tenez jamais le tube
image contre le corps. Pendant toutes les opérations
d’installation, de dépose et de manipulation de ce
tube image, quelle que soit la méthode employée,
vous devez toujours porter des lunettes de sécurité
anti-éclatements. Les personnes qui ne portent pas ce
type de lunettes doivent se tenir à l’écart du tube
image lors de la manipulation de ce dernier.

RAYONS LASER

Si ce produit contient un rayon laser, évitez toute
exposition directe à ce faisceau lors de l’ouverture du
couvercle ou lors de l’élimination des verrouillages de
sécurité ou après défaillance de ces verrouillages.

DEUTSCH

SICHERHEITSVORKEHRUNGEN

WARNUNG: Die folgenden Vorkehrungen müssen eingehalten werden.

ALLE PRODUKTE

Bevor die Grundplatte gewartet wird, sollte ein Trenntrafo
zwischen die Netzleitung und das Produkt eingebracht
werden.

1. Wenn die Grundplatte in das Gehäuse zurückgestellt
wird, stellen Sie sicher, dass alle
Schutzvorrichtungen wieder an ihrem Ort sind.

2. Wenn Wartung erforderlich ist, halten Sie die
originale Verdrahtungsart ein. Besondere Vorsicht ist
nötig, um die korrekte Verdrahtungsart in jedem
Hochspannungsstromkreis zu gewährleisten.

3. Viele elektrische und mechanische Teile von
HITACHI Produkten haben besondere
sicherheitsbezogene Eigenschaften. Diese
Eigenschaften fallen oft nicht ins Auge, aber der
durch sie gewährte Schutz kann nicht unbedingt
erreicht werden, wenn man Ersatzteile benutzt, die
für höhere Spannung, Leistung usw. ausgelegt sind.
Ersatzteile, die diese besonderen
Sicherheitsmerkmale haben, sind in den

Prinzipskizzen und Ersatzteillisten an einem ! zu
erkennen.
Der Gebrauch von Ersatzteilen, die nicht dieselben
Sicherheitsmerkmale haben wie die empfohlenen
HITACHI Ersatzteile, wie sie in der Ersatzteilliste
aufgeführt sind, kann zu elektrischem Schlag, Feuer,
Röntgenstrahlung und anderen Gefahren führen.

4. Immer die originalen Abstandsstücke ersetzen und
die Leitungslängen beibehalten. Wo ein Kurzschluss
passiert ist, die Teile ersetzen, bei denen Überhitzung
nachzuweisen ist.

5. Der Isolierwert sollte bei 500 V Gleichstrom
zwischen den Hauptpolen und allen zugänglichen
Metallteilen nicht unter 2M Ohm liegen.

6. Bei der Prüfung auf Durchschlagsfestigkeit sollte
kein Überschlag oder Durchschlag vorkommen,
wenn zwei Sekunden lang 3 kV Wechselstrom oder
4,25 kV Gleichstrom zwischen den Hauptpolen und
allen zugänglichen Metallteilen angelegt wird.

7. Bevor das gewartete Produkt dem Kunden
zurückgegeben wird, muss der Wartungstechniker
das Gerät gründlich prüfen, um sicherzustellen, dass
es betriebssicher ist ohne das Risiko eines
elektrischen Schlages. Der Wartungstechniker muss
sicherstellen, dass keine vom Hersteller im Gerät
eingebaute Schutzvorkehrung schadhaft geworden ist
oder bei der Wartung unabsichtlich beschädigt
wurde.

CE KENNZEICHEN

1. HITACHI Produkte enthalten eventuell das CE
Kennzeichen auf dem Leistungsschild, welches
angibt, dass das Produkt Teile enthält, die eigens
zugelassen sind, um bis zu einem spezifizierten
Niveau elektromagnetische Störfreiheit zu bewirken.

2. Wenn Sie irgendein Teil in diesem Produkt ersetzen,
benutzen Sie bitte nur das korrekte Teil, das in der
Ersatzteilliste aufgeführt ist, um sicherzustellen, dass
dieser Standard eingehalten wird, und geben Sie acht,
die Verdrahtungsart in ihren ursprünglichen Zustand
zurück zu versetzen, weil das einen Einfluss auf die
elektromagnetische Abstrahlung/Störsicherheit haben
kann.

BILDRÖHRE

1. Die Leitungsausgangsstufe kann Spannungen von
mehr als 25 kV entwickeln; wenn die
Höchstspannungskappe entfernt werden muss,
entladen Sie die Anode zum Gehäuse über einen
hochohmigen Widerstand, bevor Sie sie aus der
Bildröhre entfernen.

2. Hochspannung sollte immer auf den festgelegten
Wert des Gehäuses beschränkt bleiben und nicht
mehr. Betrieb bei höherer Spannung kann zum
Versagen der Bildröhre oder zu hoher
Spannungszufuhr führen und kann unter Umständen
auch Röntgenstrahlung hervorbringen, die leicht über
dem Konstruktionsniveau liegt. Die Hochspannung
darf auf keinen Fall 29 kV am Gehäuse überschreiten
(außer bei Projektionsfernsehern).

3. Die Hauptquelle der Röntgenstrahlung im Produkt ist
die Bildröhre. Die Bildröhre, die für die oben
erwähnte Funktion in diesem Gehäuse benutzt wird,
ist eine Spezialkonstruktion zur Begrenzung der
Röntgenstrahlung. Um den Schutz vor der
Röntgenstrahlung zu behalten, ersetzen Sie bitte die
Röhre durch denselben Typ wie den ursprünglichen
von HITACHI zugelassenen.

8. Halten Sie die Bildröhre bei der Handhabung vom
Körper weg. Sie dürfen die Bildröhre nur dann
installieren, entfernen oder handhaben, wenn Sie eine
nicht splitternde Schutzbrille tragen. Personen ohne
derartigen Schutz sollten ferngehalten werden,
solange Bildröhren gehandhabt werden.

LASER

Wenn das Produkt einen Laser enthält, setzen Sie sich
keinesfalls direkt dem Strahl aus, wenn die Abdeckung
geöffnet ist oder wenn die Verriegelung versagt.

1. DISPLAY ALIGNMENT .....................................................................................................5

ISPLAY SIZE......................................................................................................................5

A. D
B. P

ICTURE POSITION ..............................................................................................................5

C. L

INEARITY ..........................................................................................................................5

EOMETRY DISTORTION (ALL PRESET MODES)....................................................................5

D. G
E. A

LIGNMENT PROCEDURE.....................................................................................................5

HITE BALANCE ADJUSTMENT (9300°AS MAJOR TEMPERATURE) LOW LIGHT ADJUST........6

F. W

OCUS ADJUSTMENT ...........................................................................................................6

G. F
H. C

ONVERGENCE ADJUSTMENT .............................................................................................6

RESETTING MODES ADJUSTMENT.......................................................................................6

I. P
J. P

OWER ADJUSTMENT ...........................................................................................................7

2. CONTROLS AND CONNECTORS LAYOUT ...............................................................10

A. MAIN PCB .......................................................................................................................10

B. CRT/B ..............................................................................................................................11

C. PIN ASSIGNMENT ..............................................................................................................11

3. CIRCUIT DESCRIPTION................................................................................................12

A. POWER SUPPLY .................................................................................................................12

OWER SUPPLY BLOCK DIAGRAM.....................................................................................12

B. P
C. P

OWER SUPPLY CIRCUIT ...................................................................................................13

D. TDA4855/4858 AUTOSYSNC DEFLECTION CONTROLLER ..................................14

FIGURE (4) (5) .......................................................................................................................14

ORIZONTAL PROCESSOR..................................................................................................16

E. H
F. V

ERTICAL PRE-AMP...........................................................................................................16

ORIZONTAL DRIVE ..........................................................................................................17

G. H

4. TROUBLESHOOTING.....................................................................................................18

A. MONITOR CHECK FLOW CHART........................................................................................19

APPENDIX A: SCHEMATIC DIAGRAMS & PCB ASSEMBLIES ...................................22

APPENDIX B: PARTS LIST.................................................................................................30

APPENDIX C: DISPLAY UNIT ASSEMBLY.....................................................................50

APPENDIX D: CRT & YOKE ASSEMBLY........................................................................53

-4-

1. DISPLAY ALIGNMENT

A. Display Size

All preset mode listings in Table 1. shall be within the following limitations:

H. WIDTH: 350 ± 4 mm
V. HEIGHT : 260 ± 4 mm

B. Picture Position

All preset mode listings in Table 1 shall be within the following limitations:

H. PHASESCREEN : SCREEN CENTRE ± 4 mm
V. CENTERSCREEN : SCREEN CENTRE ± 3 mm

C. Linearity

The CONTRAST and BRIGHTNESS control shall be properly adjusted at 15 F-L with Full-intensity reverse
pattern, then change to crosshatch Pattern. The measured values of linearity should be less than 10% when
calculated using all latticrs and should be less than 6% when calculated using adjacent lattices.
The calculation formula was listed below:
H max - H min Vmax-Vmin
x100% or x100%
(H max + H min)/2 (V max + V min)/2

D. Geometry Distortion (all preset modes)

The CONTRAST and BRIGHTNESS control shall be properly adjusted at 15 F-L with full-intensity reverse
pattern, then switch to cross hatch pattern and place unit facing east.
Pincushion should be less than 2.0mm
Barrel should be less than 2.0mm (top & bottom)/ 1.5 (left side & right side)
Trapezoid should be less than 3.5mm Parallelogram should be less than 3.5mm Tilt should be less than 1/2 degree.

E. Alignment Procedure

E-1. Brightness Adjust:

1. Adjust the VR980 so that the +15VS rail is 14.9V±0.1V (The voltage of the C944) in TIMING 1.

2. Check the voltages below :.

C974 : 202 ± 3V
C947 : 76 ± 2V
C946 : 44 ± 1.5V
C940 : 10.4 ± 0.4V
C959 : 12 ± 0.3V

3. Short-Circuit protection function check.

 The power source is 230VAC input.
 When C944 is shorted, all output voltage should be shut down and unlatch.
 When normal condition is recovered, all output voltage should recover automatically.

E-2. Light output adjust

 Select Timing 1, preset BRI. And CONT. to max. position.
 Adjust G2 to get G2 = 550V ± 10V
 Adjust VR803 to get light output = 0.3FL ~ 0.6FL
 Select Timing 2, adjust VR405 to get pattern over scan. (H SIZE 100%)

- 5 -

F. White Balance Adjustment (9300°as major temperature) Low light
adjust

9300° 6500° 5000°
x = 0.283 ± 10 x = 0.313 ± 15 x = 0.324 ± 15
y = 0.297 ± 10 y = 0.329 ± 15 y = 0.342 ± 15
Y = 0.3 ~ 0.6FL Y = 0.3 ~ 0.6FL Y = 0.3 ~ 0.6FL

1. Select Timing 6, adjust BRI. And CONT. to m ax. disconnect RGB signals, adjus t R/B BAIS to 100 scale (OSD

then slowly adjust G BAIS to 100 scale adjust VR803 to get light output = 0.3 ~ 0.6FL for 9300°, repeat above
steps for 6500° and 5000° R/B GAIN setting to get raster color temperature within specified, finally, adjust
BRI to get raster = 0.06FL.

2. High light adjust
9300° 6500° 5000°

x = 0.283 ± 10 x = 0.313 ± 10 x = 0.324 ± 10
y = 0.297 ± 10 y = 0.329 ± 10 y = 0.342 ± 10
Y =30 FL Y = 30 FL Y =30 FL

Select Timing 4, measure 2 "square, set CONT. to Max, position and SUB-CONT to 127, R/B GAIN to 200, G
GAIN to 200, adjust SUB-CONT to get light output = 35 FL for 9300°, repeat above steps for 6500° and
5000° R/B GAIN setting to get color temperature within specified.

3. Select Timing 3 with full white pattern adjust OSD-ABL (SUB BRIGHTNESS) to get full white light output =

30 ± 2 FL.

-0
+5

-0

-0
+5

+5

-0
+5

G. Focus Adjustment

G-1. Adjust brightness, have the brightness of raster be 0.06FL and contraset be 30FL in timming 6.

G-2. Adjust the G4a and G4b of theFBT, have focus be in the best condition on the 1/4 diagonal of

screen in timing 5.

H. Convergence Adjustment

Input R+B and R+G signals, make sure convergence within specified (if not 4 pole and 6 pole). A zone =

0.3MM., B zone 0.4MM. (X) < 0.4MM, (Y) < 0.4MM.
NOTE : 1. A area = 260mm (circle)

2. B area = 350 x 260 mm

I. Presetting Modes Adjustment

There are 12 preset modes, individual adjust is needed.

1. H-SIZE adjust : adjust control key to get H-SIZE = 350 ± 4mm.

2. H-CENTRE adjust : adjust control key to get centre within ± 4mm

3. V-SIZE adjust : adjust control key to get V-SIZE = 260 ± 3 mm

4. V-CENTRE adjust : adjust control key to get centre within ±2mm

5. Geometric adjust : adjust control key to get minimum distortion.

6. H-linearity check : check and make sure linearity meets spec..
(CROSS HATCH PATTERN 10X8)

2(MAX - MIN)
X100%

MAX + MIN

Any : <10%
Adjacent : <5%

7. V-linearity check : check and make sure linearity meets spec.

- 6 -

2 (MAX - MIN)
X100%
MAX + MIN

Any : <10%
Adjacent : <6%

8. Geometric check : check and make sure geometric meets spec.

9. Get into OSD select EE-USER item, press ENTER till OSD disappear then turn off power, disconnect JP1,
turn on power again, make sure all of the alignment parameters has been stored properly, make H-SIZE adjust
range can OVER SCAN and -5%, PHASE adjust range >15mm, V-SIZE adjust range can OVER SCAN and

-6%, V-CENTRE adjust range >20mm and make sure TILT adjust works properly.

J. Power Adjustment

J-1. Adjust the VR980 so that the +15Vs rail is 15.3v±0.1v ( voltage of the C944) in timing 1.

J-2. Check voltages below:

C974 : 202±3v

C947 : 76 ± 2v
C946 : 44 ± 1.5v
C940 : 10.4 ± 1v

J-3. Short-circuit protection function check

1. the power source is 230vac input

2. when C944 is shorted, all output voltage should be shut down and unlatch

3. when normal condition is recovered, all output voltage should recover automatically.

J-4. Side Pincushion, Tilt and Geometry Distortion Adjustment

1. Input timing 1, adjust the display be normal position and size.

2. Adjust front control key to get the best pincushion distortion and tilt.

3. Select P502 and adjust VR402~VR404 to get the best geometry distortion.

J-5. Focus Adjustment

1. Input timing 1, EXT. BRIGHTNESS move to center position. Use EXT.CONTRAST set the
brightness to 25FL.

2. Adjust Focus VR (mounting on FBT), to get best focus.

J-6. Preset Timing Adjustment

1. Input each PRESET MODE timing, and use front control key, adjust the display to the normal
position and size and wait for 5 seconds.

2. Switch to next timing repeat 1 process. Until every PRESET MODE timing has been adjusted.

J-7. Timing And Pattern

Timing mode pattern.mdnm/
1 VESA 80k CROSS HATCH
2 VESA 80K 2" SQUARE
3 VESA 80K FULL WHITE

- 7 -

J-8. Power Saving Function Check

The power source is 230Vac input
When the sync signal is removed, the monitor should enter suspend-mode and then off-mode.
When power saving, the power consumption of monitor should be less than: suspend mode 8w off-mode
The monitor recovering time from suspend-mode or off-mode to on-mode should be less than 5 seconds.

TABLE 1

TIMMING MODE PATTERN

1. 64K

2. 37.8K/60HZ

3. 60K Full-white

4. 60K

5. 80K “me”

6. 80K

51 CROSSHATCH
51 CROSSHATCH

5×2″squares

5×2″squares

PRESET MODES TABLE 2

MODE H Pixes

V Lines

d: dot d: display b: back porch p: pulse f: front

1

VGA60 640

480

2

VESA75 640

480

3

VGA70 720

400

4

VESA60 800

600

5

VESA85 800

600

6

VESA60 1024

768

7

VESA75 1024

768

8

VESA85 1024

768

9

VESA60 1280

1024

10

VESA75 1280

1024

11

VESA85
(primary)

12

VESA75 1600

1280
1024

1200

Fd (MHz)

Polar (H/V)

25.175
N/N

31.5
N/N

28.322
N/P
40
P/P

56.25
P/P
65
N/N

78.75
P/P

94.5
P/P
108
P/P
135
P/P

157.5
P/P

202.5

P/P
A: Back Porch (us) B: Display Time (us)
C: Front Porch (us) D: Sync Width (us)
F: Back Porch (ms) G: Display Time (ms)
H: Front Porch (ms) I: Sync Width (ms)

Fh (KHz)

Fv (Hz)

31.469

59.941

37.5
75

31.47

70.09

37.88

60.32

53.674

85.061

48.36
60

60.023

75.029

68.677

84.997

63.981

60.02

79.976

75.025

91.146

85.024

93.75
75

F: Th (us)

F: Tv (ms)

31.778

16.683

26.67

13.33

31.78

14.27

26.4

16.58

18.631

11.756

20.68

16.67

16.66

13.328

14.561

11.765

15.63

16.661

12.504

13.329

10.971

11.761

10.667

13.333

D: Td (us)

D: Td (ms)

25.422

15.253

20.317

12.8

25.422

12.711
20

15.84

14.222

11.179

15.754

15.88

13.003

12.795

10.836

11.183

11.852

16.005

9.481

12.804

8.127

11.235

7.901

12.80

C: Tb (us)

C: Tb (ms)

1.907

1.048

3.81

0.427

1.907

1.112

2.2

0.607

2.702

0.503

2.462

0.6

2.235

0.466

2.201

0.524

2.296

0.594

1.837

0.475

1.422

0.483

1.501

0.491

B: Tp (us)

B: Tp (ms)

3.813

0.064

2.032

0.08

3.813

0.064

3.2

0.106

1.138

0.056

2.092

0.124

1.219

0.05

1.016

0.044

1.037

0.047

1.067

0.038

1.016

0.033

0.948

0.032

A: Tf (us)

A: Tf (ms)

0.636

0.318

0.508

0.026

0.636

0.381
1

0.025

0.569

0.019

0.369

0.063

0.203

0.017

0.508

0.014

0.444

0.016

0.119

0.013

0.406

0.011

0.316

0.011

- 8 -

- 9 -

2. CONTROLS AND CONNECTORS LAYOUT

A. Main PCB

- 10 -

B. CRT/B

C. Pin Assignment

C-1. Connect Function

VR501 : H-CENTRE VR
P701 : TILT CONN
JP1: PRESET CONN
P902 : DEGAUSSING COIL CONN
P703 : X-RAY TEST PAD

-- P302 P303 P301 P5

1 HFLB Vout DSUB9 DDC-SCL
2 GND EEP-SCL R-IN DDC-SDA
3 G1 EEP-SCL GND GND
4 6.3V H-OUT B-IN V-SYNC
5 5V GND GND H-SYNC
6 76V -- G-IN -­7 12V -- GND -­8 CONTRAST -- -- --

- 11 -

3. CIRCUIT DESCRIPTION

A. Power Supply

The F900 power supply is a universal switching mode power supply. It consists of an off-line
flyback converter and a Boost converter. The output voltage and current rating are +7.5V /

0.81A, +15.3V / 0.84A, +44V /0.2A, +76V / 0.2A, and B+ +202V / 0.4A.

B. Power Suppl y Block Diagram

- 12 -

C. Power Supply Circuit

C-1 RECTIFIER AND FILTER CIRCUIT

The 90Vac 260Vac input line voltage is rectified by DB901, and smoothed by C906 via the PFC circuit to
provide DC operating voltage for the circuit.

C-2 FLYBACK AND PWM CIRCUIT

When power is initially applied to the circuit, C909 charg es throu gh R903 an d Q901. Wh en the voltag e across
C909 reaches a level of 16V, U901 is enabled, turning on Q903 and turning off Q901 to complete start-up
action.

During the On-time of Q902, energy is stored in T902. At this time th e polari t y of the output win dings i s su ch
that all output rectifiers are reverse biased and no energy is transferred.

Primary current is sensed by R914 an d compared to a DC level that is determined by volt age f eedback. When
this level is reached, Q902 is turned off and the polarity of all T901A windings reverses, forward biasing the
output rectifiers. All the energy stored is now transferred to the output capacitors. Many cycles of this
store/release action are needed to charge the outputs to their respective voltages.

The main voltage (202V) across R944, R945, R947, C956, R946, VR901 is smoothed by C945 and fed via
the optp-coupler U900 to the primary regulator to the error amplifier (U901 pin1).

C-3 SNUBBER CIRCUIT

Energy stored in the leakage inductance of T902 cause a voltage spike which be added to the normal reset
voltage across T902 when Q902 turn off. The clamp consisting of D905, R904 and C907 limits this voltage
excursion from exceeding the Vds ratin g of Q902. In addition , a tu rn off sn u bber m ade u p of D906, R 90 5 and
C908 keeps power dissipation in Q902 low by delaying the voltage rise until drain cu rrent has decreased f rom
its peak value. This snubber also damps out any ringing which may occur due to parasitic.

C-3 SYNCHRONIZED CIRCUIT

The oscillator frequency is defined by R912, C920. The equation is approximately:
Fosc=1.8/(R912*C920). The external signal that comes from horizontal circuit synchronises the working

frequency of power circuit Via U980 to U906 (PIN 2). For divide frequency in over 50KHz by U906
(74LS221)

C-4 POWER SAVING CIRCUIT

The monitor has ON, Suspend/Standby and OFF states. The monitor enters Suspend/Standby mode if either
V-sync or H-sync signals are removed. When the machine in th e Suspend/Standby state, PS1 s hould be low to
turn off +15Vs. In this state, input power should be less than 15W and LED illuminate yellow. The monitor
enters OFF mode if both H-sync and V-syn c are removed. Wh en in the OFF St ate, PS1 and PS 2 sh ould below
simultaneously to turn off +15Vs and +7.8Vs outputs. In this state, input power should by less than 5W and
LED illuminate amber.

C-5 DEGAUSS CIRCUIT

The DEGU signal which comes from micro-p to control degauss coil act or not.
When DEGU is high, Q946 will be saturated to make RL901 working, AC line provides a degaussing current

to degauss coil.

C-6 OVERLOAD ROTECTION CIRCUIT

The primary curr ent flows through the current sensing resistor R914. The voltage drop on R914 will be
rectified by D921 and keep a dc level in C921 that is dependent on the output power. When this DC level
reach the trigger voltage of Q912, the pin1 of U901 goes low and the power stage is immediately switched
off.

C-7 BROWN-OUT CIRCUIT

When the input voltage down below the setting level (85Vac-70Vac), Q914 will be supplied with a trigger
voltage, pin 1 of U901 goes low and the power stage will be shut down.

- 13 -

C-8 PFC CIRCUIT

The PFC CKT is combined with U991A, D901A, T901A..., it is an active type, called” Booster Follower”
circuit.
The feedback points of U991A is not only connected to C906, but also the AC line-in voltage of C901A which
the voltage waveform shape is same as the line-in voltage.

The follower booster circuit can smooth the input current to improve PF value.

D. TDA4855/4858 AUTOSYSNC DEFLECTION CONTROLLER
Figure (4) (5)

- 14 -

Pinning

SYMBOL PIN DESCRIPTION

HFLB

1 horizontal flyback input

XRAY 2 X-ray protection input
BOP 3 B+ control OTA output
BSENS 4 B+ control comparator input
BIN 5 B+ control OTA input
BDRV 6 B+ control driver output
HDRV 7 horizontal driver output
GNDP 8 ground (power ground)
Vcc 9 positive supply voltage
FOCUS 10 H- focus parabola output
EWDRV 11 EW parabola output
VOUT2 12 vertical output 2 (ascending sawtooth )
VOUT1 13 vertical output 2 (ascending sawtooth )
VSYNC 14 vertical sync input /output
HSYNC 15 horizontal / composite sync input
CLBL 16 video clamping pulse / V-blanking output
VPOS 17 V- shift input
VAMP 18 V- size input
VSCOR 19 vertical S -correction input
EWTRP 20 Ew trapezium correction input
EWPAR 21 Ew parabola amplitude input
VAGC 22 external capacitor for V-amplitude control
VREF 23 external resistor for vertical oscillator
VCAP 24 external capacitor for vertical oscillator
GNDS 25 ground (signal ground)
HPLL1 26 external filter for PLL 1
HBUF 27 buffered f/v voltage output
HREF 28 reference current for horizontal oscillator
HCAP 29 external capacitor for horizontal oscillator
HPOS 30 H- shift input
HPLL2 31 external filter for PLL 2/soft start
EWWID 32 H-size input

D-1. Sync processor

Pin 15 accepts H or H+V sync.
Pin 14 in H/V separate signal is input-mode, in H/V composite signal is output-mode. This

function is used as mode detector.

- 15 -

E. Horizontal Processor

H sync go through TDA4855 internal separation circuit to the first comparator for HOR. Phase ADJ
and then to stage output. A HOR. Drive pulse from pin 7 and input H-sync limit is setting by R431,
R432 and C415.

E-1. Geometric distortion correction

The E-W parabola output from pin 11 is controlled DC CONTROL (pin 20 & 21) and this
parabola go through Q404-Q407 input to pin30 (HOR. Phase ADJ.) for pin-balance ADJ. and
also go through Q408-Q411 for parallel ADJ. And through Q412-Q414 for corner ADJ.

F. Vertical Pre-Amp

VERT. Sync input to VERT. OSC. and generates a saw-tooth at pin 24, the free-run frequency is
setting by R428 and C412 & (fvo=1/10.8 x R428 x C412 & C445), the V-position is controlled by the
D-C (pin 17), and V-size is controlled by D-C (pin 18), and the pin 19 is to ADJ. VERT. linearity.

F-1. VERT output circuit U601 (TDA 8351) see Figure (6)

The saw-tooth is output from U401 pin # 12 & 13. to the pins # 1 and 2 of TDA8351 (vert output
amplifier) and then output from pin # 7 to the vert DY for vert. deflection.

F-2. Horizontal size modulation

To modulation H-size control DC is achieved by applying a parabola to the pins 3 and 5 to
control U402 mono-stable to generate a square wave to drive Q505 thus obtaining a variable
B+ which is input frequency dependent.

31.5KHz T=31.75mS

6.8 to 8.6 mS

HOR.B+=200V x = 43.2 to 54.7V

31.75 mS

95KHZ T=10.526 mS

6.8 to 8.6 mS

HOR.B+=200V x = 130 to165V

10.526 mS

- 16 -

G. Horizontal Drive

The drive pulse output from pin 7 of U401 (TDA 4855) through a buffer (Q416/ Q417) and drive stage
(Q503, T501), drives the HOR. Output transistor (Q504).

G-1. CS Circuit

CS control is multiple type the SW1/ SW2/ SW3/ SW5 of U1 to control Q512/ Q520/
Q514/Q515

CS transistor switch Ref. To Fig. Below-

G-2. HORIZONTAL Linear

The D-C HOR. linear control circuit outputs a duty cycle (PWM) through Q545 & Q546 to
the winding of L501 to ADJ. the inductance of linear coil of L501.

G-3. HV circuit

A reference v oltag e is der ived from the bleede r of FBT and in put to U801 (P WM m odulator I C)
to drive Q801.
When Q801 turns on the energ y is stored in t he FBT. When Q801 turns off, the resonate circui t
creates a pulse to the FBT to genera te a HV (*25 KV / 26KV) and G5 voltag e (6.1 ~7.8 KV) a nd
G1 voltage (-180V) and +32V for X-RAY protection and +300V for dynamic focus.

H. Video Amp Circuit
H-1. Video PRE AMP

U301 (M52743) is the Video PRE-AMP. The input signal is 0.7Vp-p, the pre-amp IC U301
amplifies the video signal to be 3-4 Vp-p and controls white balance and contrast.

H-2. Video output AMP

This stage including AMP IC (U303) amplifies the video signal to be around 40Vp-p and
drives the CRT cathode.

H-3. OSD signal

The Mirco-p output DATA and CLK, to the OSD IC U302 (CM46542) and output data on
the VIDEO OUTPUT.

- 17 -

4. TROUBLESHOOTING

Start

Check and repair EMI Filter

Check Yes and Q901-Q902
fuse open R932,R963, DB901-DB904

Is Check and repair Q903 U903

Q903 VDS No D982, M907, M911, D912
Waveform normal?

Is 7.5V No Check Q902 D926 C937

In spec U904 U908 VR901

Q909

Correct? Q909

Is B+voltage No Check Q902 Q921 D924 U902A

202V
Ready is

Combine with

Monitor, check operation

frequency

OK

Stop

- 18 -

A. Monitor Check Flow Chart

A-1. No raster

-19-

A-2. No Picture

-20-

A-3. No vertical deflection (raster become a horizontal line)

- 21 -

APPENDIX A: SCHEMATIC DIAGRAMS & PCB ASSEMBLIES

- 22 -

1234

D

C

B

A

GREEN
V-MODE
AMBER

5V

MUTE

TO U4 12V

TO Q952 C

SW1

POWER ON/OFF

R65

SW2

1.3K

FUN+

1%

SW3
FUN-

SW4
ADJ+

SW5
ADJ-

GND

R80

4.7K

GND

R10

470

8.4V

R72
100

10K

2SC945

1N4148

R33
47K

RN1203

R7

5.6K
1%

R71

1%

JP1

Q1

HZ7A1

D3

Q3

P2

KEY-IN

R4

5.1K
1%

R5

2.7K

LED1

LED2

GND

1
2
3
4

1%

R6

1%3.6K

XXR73

R64

C7

.01U

1M

GND

2
1

D1

1N4148

8.4V
R63

2.7K

D2

1N4148

ZD1

R34

Q2

2SC945

1N4148

R11

1K

1/4W

GND GND

4.7k

+

C70
47U

TO U401 PIN3

GND

GND

R8

10K

1%

33PC5

C42

XX

D406

R1

4.7K
+

10U
16V

GND

V-SIZE

H-PHASE

HSIZE
RESET

33PC6

8MHzY1

KEY-IN

FAT.

M

PS1
PS2
SW1

ZD2

HZ5C1

C9

100U

10V

C4

1

DAC2

2

DAC1

3

DAC0

4

RESET

5

VDD

6

GND

7

OSCO

8

OSCI

9

P15

10

P14

11

P13

12

P12

13

AD1/P11

14

AD0/P10

15

INTE/P16

16

P27

17

P26

18

P25
P24
P23 P22

GND

+

C10

.01U

R38
10K

GND

R37
10K

U1

UM6861

R13

8

7

U2

24C08

2

1

R39

R36

10K

5.6k

VSYNCI
HSYNCI

DAC3
DAC4
DAC5
DAC6

DAC7
HSYNCO
VSYNCO

DAC13
DAC12
DAC11
DAC10

DAC9

DAC8

DDC-SCL
DDC-SDA

100

R14
100

6

54

3

P20
P21

H
L

H
H
L

U4
+

58K-66K

L
H

H

H

LL

76K-89K66K-76K

L
H

H

H
H
H
HH

H

D5

XX

I

7812

G

GND

12V

O

+

C14

220U

16V

R40
10K

+

C8

220U

10V

GND GNDGND

R35

5.6k

C3

.01U

10KX8

5V

RA1

7805

O

+

C2
2200U
10V

GND GND

1/4W

R43

D4
XX

U3

G

10K

I

1/4W

10K

R45

1/4WR70

2.2K

1/4WR47

10K

7.5V

C1

.01U

1/4WR48

10K

R49

4.7K

R50

4.7K

SW1
SW2
SW3
SW4

SW5

31K-33K

L
L

L

R178.2K

HL
L

36.1K-40K

L
H

33.1K-36K

LL
HL

H
HH

16VS

52.1K-58K40.1K-52K

L
L

H
H

L

C13

47U
25V

R68 10K

5V

40
39

38
37
36
35

VSYNC
HSYNC
VCENT

PIN.
TRAP.
TILT.

D14
1N4148

D16
1N4148

GND

34
33
32
31
30
29
28
27
26
25

(POSITIVE)

H-OUT

(NEGATIVE)

V-OUT
CORNER.
PARA.
BALA.

5V

BRI. BRI

D10

1N4148

5V

D13

1N4148
24
23
2219
2120

C40

100P

5V

7.5VS

SW4
SW5
SW2

100P

GND

C41

D8

1N4148

D6

1N4148

L30

BEAD

R100

3.3
2W

GND GND

L31

BEAD

5V5V

V350
G1
GND
H-BLK

6.3V

12V

ABL
82V

C31

.01U

100V

D11

1N4148

D9

1N4148

D7
1N4148

GND

GND

GND

C45

.1U

GND

C32

.01U

GND

P1

1
2
3
4
5
6
7
8
9

D12

1N4148

V-OUT

CLAMP

C36

100P

GND

EEP-SDA
EEP-SCL

GND

GND

C39

100P

P3

1
2
3
4
5

L8

5V

D15
1N4148

D17

1N4148

GND

C11

2200P

GND

R161001/4W

100

R15

1/4W

5V

BEAD

DDC-SCL

BEADL7

DDC-SDA

GND

BEADL5

V-SYNC

H-SYNC

BEADL6

C37

220P

GND GND

R69 10K

DEG.DEG.

DDC-SCL
DDC-SDA

R62
1K

1/4W

P5

1
2
3
4
5

C38

220P

R20 1001/4W
R21 1001/4W
R22 10K1/4W
R23 10K1/4W
R24 10K1/4W
R25 1001/4W

R26 10K1/4W

1/4W10KR30
R28 10K 1/4W
R29 10K 1/4W

10K 1/4WR27

R31 10K 1/4W

Q5

2SC945

+

C25 4.7U

4.7UC29+4.7UC30

+

4.7U

C15

+

4.7U

+

C16

4.7U

4.7U

+

C17

R59

4.7K
1/4W

4.7UC21+4.7UC20+4.7U

+

+

C18

GND

C19

4.7U

+

C23

4.7UC24

+

C27

470P

R60
R61
10K

GND

10K

Q4

2SC945

R58
10K

GND

R57
10K

C26

1000P

HITACHI (EUROPE) LTD

Title

SCHEMATIC, DEF & POWER VA-916/

SWITCH BOARD VR-916

Sheet 1 of 3

89K-

H
H
H

L

H

H-SIZE

H-PHASE

V-SIZE

V-CENT

PIN

TRAP

TILT

H-MORIEH-MORIE

CONNER

PARALLEL

BALANCE
V-MORIEV-MORIE

H-SYNC

V-SYNC

1234

D

C

B

A

H-SIZE

12V

B-DRIVE
H-DRIVE

15VS

H-MORIE
V-MORIE
U601-P9

HFLB
V-OUT

H-OUT

Q814-E

X-RAY

X-RAY
CLAMP

V-CENT
V-SIZE

V350

V-MODE
PIN

TRAP

12V

BLANCE

PARALLEL

CORNER

H-PHASE

1

R456

6.8K

R402

P730

R730

5.11K

R424

470K
1/4W

GND

2SC945

Q404

3

2

R455

4.7k

GND

1

1%

47K

Q401

RN1203

R405

+

C446

470U

16V

GND

4

100

1/4W

2

R731

4.3K

1/4W

1%

R459

22K

1/4W

2SC945

Q405

R447

430k

1/4W

5

R441
150K

GND

R454

56K

1/4W

7

6

GND

R476

1K

R477

1K

R416 100

R732

7.32K
1%

U402

AN5767K

9

8

R457

5V

R478

10K

D420

1N4148

ZD730

HZ12C1

GND

GND

2SC945

Q406

10

220K

GND

GND

C730

10U

GND

R426

47K

1/4W

11

R450
220K

Q432

2SC945

Q428

GND

13

12

GND

R463

22K

GND

C404
470P

GND

+

R733

1K

GNDGND

R423 39K 1/4W

12V

C455

XX

XX

R427

56K

1/4W

2SC945

2SC945

Q407

R466
680K

1/4W

R462

33K

GND

Q408

C406

25V NP

Q732

R401
240K

1/4W

R403

47K

1/4W

R410

33K

10U

R411

R734

2.2K

Q731

2SA733

2SC945

GND

R400

51K

2SC945

Q409

R408
150K

1/4W

10K

1/4W

C433
470P

R489
1/4W

2.2

(FUSE)

Q417

2SC945

D405

1N4148

Q416

2SA733

C424

.1U
MEF

GND

R601

100

1/4W

C444

100P

GND

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2

R603

GND

R417

100 1/4W

100PC443

10

1/4W

R418

1.2K
1/4W

+

C408

470U

16V

U401

TDA4858

(FUSE)

MEF.1UC422

R428

22K

1%

.1U

C412

MEF

C413

GND

.0022U

PPN

R434

150K 1/4W

R440
270K

2SC945

Q410

2SC945

Q411

R444
330K

2SC945

Q412

1/4W

GND

D404

1N4148

ZD404
HZ5C1

R419

3.3K

GND

R429

8.2K

R432

750

1%

C414
.22U

MEF

2SC945
Q413

R465
120K
1/4W

R404

6.2K
1/4W

GND

R431

1%

C415
.01U

PPN

R464

7.15K
1/4W

1%

1%1.24K

2SC945

Q414

ZD491

HZ12C1

C437
100U

16V

2SA733

Q424

C428

1500P

MEF

2%

C410
.01U

R420

R437 620K

C416

2SC945

R409
270K

GND

+

GND

MEF

32313029282726252423222120191817

27K

MEF.01U

R407

13K

1/4W

Q438

GND

R449

47 1/4W
(FUSE)

R451

2.2K
1/4W

GND

GND

MEF.01UC438

MEF.012U

R406

C417

+

GND

R430

10K

C440
220P

2.2M

C491
470U

16V

2SC945

Q422

2SA733

R491

1/4W

(FUSE)

Q420

220

D491

FR104

D494

1N4148

+

C427
100U

16V

GND

D430
1N4148

D431
1N4148

GND

R487

R422

1.5K

1/4W

(FUSE)

C601

R436 56K

100

R620

XX

R623

5.36K

R621

100

1%

R607

43V

ZD442

HZ12C1

R482

C434

.01U

MEF

4.7K

R481
10K

R442

4.7K

NO NOTES ? W RESISTOR IS 1/8W
N0 NOTES ? V CAPACITOR IS 50V

XX

2W

1

15V

R494
100
1/4W

C512

.1U

250V

MEF

+

C603

2200U

25V

105C

GND

R443

2.2K
1/4W

Q442

2SD667

GND

FORM U401

PIN 26

U601

TDA8351

R604 1W1

C435

R468

10K

C604
100U

63V

R605

33K

MEF.1U

250V

+

VR405

R736

10K

C613
220P

R606

1/4W

20K

10K

2
3

R412
1/4W

R452
100K
1/4W

R614

GND

-

+

R461

36K

1/4W

10K

47

1/2W
R611

180

1/2W

1

C432

.1U

Q430

2SC945

(FUSE)

G1

V-OUT

Title

1%

+

C411

22U
25V

GND

R453

10K

C448

.1U

U403

LM358

6
5

22.1K

MEF

-

+

R413

1%

D421

1N4148

R473

1/4W

2.2K

(FUSE)

C470
150p

7

R469
200K
1/4W

Q431

2SC2001

R474

1K

R471

18.2K

R480

10K 1/4W

R472

9.09K

GND

1%

1/4W

GND GND

987654321

42V

D612
1N4148

R613

L611

100uH

R609

2.7K
1/4W

1
2

10

1/4W

+

GND

C605

1U

D611

.1UC602

R610

12K

+

GND

3
4

P501

HITACHI (EUROPE) LTD

SCHEMATIC, DEF & POWER VA-916/

SWITCH BOARD VR-916

Sheet 2 of 3

FBP

MUTE

5V

R475

1K

GNDGND

1N4148

GND

15VS
V-DF

C606

2.2U

H-BLK

C471

.1U
MEF

HFLB

FOR 456A49-01

446A49-01

43V

H-DRIVE

MUTE

RN1203

SW5

15VS

SW4

SW1

SW2

SW3

210V

X-RAY

FBP

TILT

7.5VS

ABL

Q548

R705

10K

GND

R580

2.2K
1/4W

C563
10U

C812
.01U

R702

2.2K

1/4W

MEF

R579

2.2K
1/4W

GND

R571

2.2K
1/4W

Q506

RN1203

GND

R817

Q703

2SC945

GND

R818

3.3K
1/4W

R701

2.2K
1/4W

C703

10U
25V

Q547

RN1203

GND

GND

R537

100

D508

1N4148

R520

2.2K
1/4W

Q507

RN1203

D509

1N4148

Q516

BF421

1/4W47K

(FUSE)1/2W

GND

Q701

2SC945

+

GND

Q702

2SA733

C501

47U
63V

105C

R578

1K

"A"

D808

1N4148

GND

+

GND

R538

1

2W

+
C524

4.7U
250V

Q803

2SC945

R703

2.2

1/4W

(FUSE)

GND

R521

2.2K
1/4W

Q508

RN1203

GND

R539

100

1/2W

(FUSE)

R816

330

1/4W

C701

25V

GND

P701

1

L90

TO ROTATE COIL

R506

220

1/4W

R550

22K

R549

2.2K
1/4W

Q510

RN1203

GND

R536

2.2K

1/4W

Q509

RN1203

GND

R502

.2
1W

FUSE

+

10U

2

L89
BEAD

R503

R507
1/2W

R551

GND

L506

100UH

100U

R814

10

1/4W
(FUSE)

2W220

Q501

2SD669
220

Q502

2SD669

330
1/4W

C803
250V

105C

GND

C822
100U

16V

R522
1/2W

C513

1200P

1KV

+

GND

C829

22U

C809

47U
25V

+

220

+

GND

R504

100

5W

+

GND

R542

R510

100

1/4W

C541

.1U

400V

MPA

D803

31DF6

GND

C823

100P

5

U801
3843

76

5W120

C502
.22U

MEF

L501
4503

C511
.12U

250V

MPA

Q819

RN1203

D810

1N4148

GND

7.5VS

2SB647AC

R821

47K

1/4W

348
1

2

GND

R508

560

1W

R509

10K

1/4W

Q952-C

R815

470

1/4W

Q545

GND

C539

.1U

R806
220K

C531

3300P

PPN

R546

39
2W

C810

2200P

GND

R541

100

1N4148D541

D804

BYV36C

GND

DGQ503

2SK941

S

GND

Q546

2SA733

C516
.01U

GND

C801

3300P

1.6KV

R812

12K

R820

1K

1/2W

PPS

R804
10K

1/4W

GND

T501

R545

4.7K

FR104

G

R544

10K

1N4148

GND

U403-P7

D542

D

IRFS640A

S

GND

R811
150

1/4W

D823

C515

.1U

400V

MPA

Q517

D802

UF5408G

HS801

G

R823

68

R803

10K

R826
680K

D507

BYD73A

R530

100

C532
.01U

D

S

GND

D526

FR104

IRFS640A

D801

BYM36E

Q801

2SK1341

R801

0.2
2W

(R)

GND

(R)2.2 2WR512
(R)2.2 2WR514

Q514

G

R531

10K

C834
.01U

GND

2

GND

R513

22

1/2W

D

S

1

+

C846

2.2U

2SC945

C835

.1U

MEF

250V

Q504

2SC5440

HS501

C520
.27U

400V

MPA

D532

1N4148

R532
100

C534

.01U

T801

Q805

GND

D527

FR104

R834

10K

G

R533

10K

C821

XX

R511

D502

5TUZ47C

GND

C508

.0024U

1.6KV
PPS

D519

FR104

C521
.47U

400V

MPP

100R528

IRFS640A

Q515

D

S

+

GND

1

2W

D528

C529
.01U

+
C820

GND

VR802

C542

2200P

1KV

GND

G

1N4148

GND

R827

470

1/2W

14

12

7
44

5
8
9

10

33U

30K

+

C510

GND

1.2U
250V

C519

D

S

GND

R529

GND

R825

82K

1/4W

GND

L504

BEAD

C505

.0024U

1.6KV
PPS

GND

47U

250V

MPP

Q512

IRFS640A

10K

"A"

C506 2KV180P

C530
220P
1KV

Q505

G

B-DRIVE

C523

.047U
400V

PPN

D547

1N4148

D548

1N4148

D549

1N4148

D550

GND

C507
4700P

500V

GND

SW1

SW2

SW3

SW4

R570

JW

R540

4.7K
1/2W

R802
1/4W

P803

R574

4.7K

Q524

RN1203

R517
10K 1/4W

D505

1SS82

C533
.01U
250V

PPN

G

R560

100

P501

YOKE-H

D

2SK941

S

GND

5V

R564

4.7K

1
2
3
4

R535

4.7

Q526

2W

IRF9634

SD

R565

100

XX

GND

+

C817

D814

1N4148

50V22U

R807

47
2W

MOF

D805

HER103

C806 1KV330P

R841

XX

R805

56

1/2W

MOF

D807

UF4006

C807
220P

1KV

SG801

GND

D806

UF4006

R852

150
1W

NO NOTES ? W RESISTOR IS 1/8W

N0 NOTES ? V CAPACITOR IS 50V

10

L509
BEAD

GND

C551
.01U

250V
PPN

GND

SYNC

T506

2810

R575

GND

+

C818

2.2U
400V

+

C819

22U

250V

R862

1/4W

L508

BEAD

D506

BYV26C

GND

C826

2200P

1KV

D

G

S

GND

R576

100

Q525

RN1203

D813

UF4006

FBP

Q519

100

2.2
(FUSE)

GND

2SK941

R577

4.7K

GND

T802

L503

8mH

12x16

Q812

2SC2271

15VS

Q813

2SC945

R833
33K

1/4W

R850
620K

1W

R824
220K
1/2W

D521

FR10-04

R515

HER102

2.2

1/4W

(FUSE)

R516

2.2
1/4W

(FUSE)

R861
240K

1/2W

D809

1N4148

R844

6.8K

R846
300K

R847

330

GND GND

R848

9.1K
1/4W

R849

10K

GND

GND

+

C833

47U

25V

R835

4.7K

2SA733

R836

22K

Title

D503

+

+

GND

16V

16V

C827

2.2U

+

+

VR501

R837
470

5K

C540

R501

1K

XX

ZD801

+

C555

XX

D504

HER102

C554

XX

R860
470K

1/2W

R845

27K

R843

22K

Q814

C562
220U

C561
220U

C828

10U
25V

HZ6B2

Q811

VR803

10K

Q810

BF421

RN1206

GND

R838

180K

R839

C825

150K

.1U

GND

GND

HITACHI (EUROPE) LTD

SCHEMATIC, DEF & POWER VA-916/

SWITCH BOARD VR-916

Sheet 3 of 3

Q522

2SD667

Q521

2SB647

R561

10
1W

L502

880uH

R566

33
2W

+
C522

2.2U
250V

GND

V-DF

HV

X-RAY

15VS

MUTE

BRI

G1

FOR 456A49-01

446A49-01

D

C

B

A

L901

L902

100UH

F901

T3.15A

250V

102Y2

LN

1
P901

SOCKET

ZD990

HZ5C1

1

0.47X2

C93A

2

C991

22U
25V

GND5

R989

240

1/4W

R998
1/4W

C902

0.47X

R901

820K

1/2W

MF

C901

3

C977

104Z

C995

102

750

100UH

C931

102Y2

+

R988

3K

GND5

C903

332Y

C904

332Y

4

22mH

32

L904

R996

12.7K
MF

C992

222G

PPN

GND5

GND5

U980

6

5

43

4N35

RT901

15SP008

C983
472Y

74LS221

R995

1.5K

D991
4148

ZD991

HZ5C1

GND5

1

2

GND1

RL901

OMI-SS-212DM

PR901

1

P902

DEGUESS

R990

1W330

Q992
A733

R993

3K

R994

4.7K

1216 15 14 13 11 10 9

C993
391K

R999

4.7K

C982

222

R987

1K

1/2W

DB901

GBU4J

95W

3

2

Q946
C945

U906

87654321

GND5

C990

22U

25V

R979

47

1/4W
D980

FR104

GND5

+-

GND1

+

SYNC

R950

1/2W

D950
4148

Q990
A952L

R991

4.7K

D930

4148

R992

4.7K
1/4W

Q991

C945

C901A

0.68U
630V

MPP

0.75

91

R951

10K

1/4W

+

C996

47U
25V

R976
620K

1WS

MOF

R977

620K

1WS

MOF

R926

91K

R901A

R902A

3W(R)0.75

3W(R)

DG100015000

GND5

16V

GND5

T901A

FS14KM-10

DEGU

A733

C932
221Y1

Q901A

R904A

R905A

1/4W

R912A

15K

R975

1K

Q914

+

C969

4.7U
50V

10K

15K

C913

2.2U

GND5

D909
4148

R931

100K

R913
100K

GND5

ZD902

GND5

C903A

102K

C904A

684J

C906A

221J
NPO

+

R930

1/4W22

*

L907

jumper

GND5

GND5

GND5

GND5

D911
4148

C917
104Z

GND5

R957

22K

C930
100U

10V

R908A

47K

R913A
15K

BT169

C933

1KV

101

D901A
ER306

R906A
1M

1/2W

R907A

1/4W

1M

R903A

L906
BEAD

1/4W10

81

2

7

U991A

MC33260

36

54

G

KA

Q912

ZD901

HZ18-1

D912

*

C922
471K

+

MF

MF

D903A

4148

R911A

1/2W

270

1/4W

GND5

R922

22K

ZD903

HZ5C1

R912

22K

GND5

ZD90A

HZ15-2

+

C902A

100U

25V

+

103

R982

+

C906
100U

450VA

GND5

1/4W

R921

C923

2.2U
50V

C920

MEF

R916

47

GND5

C935

500V

1W(R)0.2F

GND5

+

C924

47U
16V

R909

47

1K

+
C911
1OOU

25VA

GND5

+

C909

100U

25V

GND5

U9013842

332

R927

1M

1/2W

R928
1M
1/2W

D916
4148

C921

220U

GND5

GND5

GND5

GND5

MF

MF

D913
4148

Q903
C945

D921

+

4148

10V

C910

104Z

R943

0.2F

1W(R)

Q901

HTL145

2SK2761

HQ902

GND5

D908

FR104

1367

2548

R903
82K

3W

Q902

G

R917

10K

1/4W

R920

240

1/4W

R914

0.3

3W(R)

D915

FR104

R908

10F

1/4W

C914

103

R911

3K

R904

C962

103
500V

GND5

D

S

33K

1W

L903
BEAD

GND5

R971

1K

1/4W

GND5

D905

FR107

C925

103

500V

GND5

D906

C970
471K

5

C907

103

500V

4
3

1

C908

331
1KV
Y5P

R905
47K

2W

FR107

7

8

C905
472Y

C980

472Y

GND5

T902

DG100012800

12

11

10

13

16

GND1

17

GND1

18

15;14

C900
472Y

C981
472Y

C998

*

4

U900

3
LTV-817MB

101

1KV

C952

331
1KV

D944
ER306

(R)

R985

0.2F
1W

(R)

R973

0.2F
1W

(R)

R972

0.47F

1W

GND1

1
2

C950

D945

ER306

(R)

R981

10

1W

D943

UF5406G

(R)

C963

331
1KV

C954

331
1KV

C955

331
1KV

D923

ER202

U904

TL431

C971

331
1KV

D972

ER306

(R)

R953

10
1W

D942

ER302

R954

10

1/4W

D941
ER202

R955

10

1/4W

R910

3K

0.22U

K

A

GND1

C961

D946

ER306

(R)

R980

10
1W

R941

47

C945

MEF

R

+

C946
220U

GND1

1000U

GND1

R940

R942

1/4W

101
1KV

63V

L944

22U

+

C943

25V

1K

R944

51K

1/2W

R945

51K

1/2W

1KF

L905

22U

16V

GND1

GND1

R946

1KF

1/4W

VR901

500

C973

103

500V

+
C947

100U

GND1

100V

+

C944

1000U

25V

R986

jumper

C941

+

1000U

16V

C964

100U

25V

R947

470F

1/4W

C956

224J

250V

MEF

+

C949

100U

250V

GND1

D951
4148

R963

470

GND1

C953

+

220U

63V
D956

D952

4148

+

R964

4.7K

GND1

R960
180K

1W

GND1GND1

*

B772QQ951

C975

100U

25V

R966

+

C940
470U

16V

GND1

1/2W1K

D957

Q941
B772Q

Title

1234

L947

22U

L945

22U

R984

jumper

+

*

R965

470

1/2W

+

C965
470U

GND1

AMBER

16V

+

C974

47U

250V

GND1

GND1

+

C948

47U

100V

GND1

*

D954

U903

GND1

L941

22U

Q942
C945

Q952
C945

25V100U

7812

GND1

R967

10K

1/4W

jumper

R983

R968

10K

GND1

D959
4148

+

C942

+

C957
47U
16VA

GND1

GND1

R961

620

1/4W

LA54B

Q960

RN1206

YELLOW

GND1

HITACHI (EUROPE) LTD.

SCHEMATIC, POWER, VA-916

C987

103M

500V

+

C959
47U
16V

GND1

R962
1/4W

D923

GREEN

GND1

620

C997

103M
500V

GND1

D955
4148

GND1

Q961
RN1206

202V

76V

44V

16VS

12V

C960
104Z

PS1

7.5VS

PS2

7.5V

FOR HEATER

10.5V

GREEN

NO NOTES ? W RESISTOR IS 1/8W
N0 NOTES ? V CAPACITOR IS 50V

FOR X62A49-01

X61A49-01

Sheet 1 of 1

THE UPDATED PARTS LIST

FOR THIS MODEL IS

AVAILABLE ON ESTA

APPENDIX C: DISPLAY UNIT ASSEMBLY

- 50 -

001 FUNCTION KNOB V99921-1 ABS 94HB WG017
001 FUNCTION KNOB V99921-1 ABS 94HB MCG18
002 PCB HOLDER(L) M98021 WG017 ABS
002 PCB HOLDER(L) M98021 WG017 ABS+PC
003 PCB HOLDER(R) M98022 WG017 ABS
003 PCB HOLDER(R) M98022 WG017 ABS+PC
004 RUBBER WASHER M98042 t=5.5-1.6
005 RUBBER PAD M9904F
006 RUBBER PAD(HEATSINK) M9904G
007 COPPER PAPER CBEZEL H9931-1
008 LOCKING CABLE TIE 142MM
009 CUSHION 2 H76748
010 RUBBER WASHER F56146 (T=4.0MM SHORE:50)
011 SCREW M4X0.7+8CF-MC(EX.LOCK WASHER)
012 TAPPING SCREW TPB 4+20N-MC
013 SCREW TPP-3+10C-MC
016 POWER LED LENS V99941
017 LOCKING CABLE TIE W2.5XL203 WHITE (YJ-203S)
018 COPPER PAPER (CRT) H99944
020 SCREW TPB-5+24P-MC
025 SCREW TPP-3+6C-MC
M01 SCREW M4X0.7+8C-MC
M02 SCREW M4X0.7+8P-MC (ADD WASHER)
M03 SCREW TPB-3+8 P-UC
MB1 SCREW TPB-3+8C-MC
MB2 SCREW TPB-3+8C-MC
MB3 SCREW TPB-3+8C-MC
MP01 SCREW TPB-4+8C-MC
MP02 SCREW TPB-4+8C-MC
MXX SCREW M4X0.7+8P-MC (ADD WASHER)

Monitor Assembly

APPENDIX D: CRT & YOKE ASSEMBLY

CRT&YOKE Assembly

001 CRT & YOKE M46QCK761X123 SAM AC500025600
002 H-CON SET H999 CRT-GND AROUND W5.6 DC020133320

- 53 -

Hitachi, Ltd. Tokyo, Japan

International Sales Division

THE HITACHI ATAGO BUILDING,

No. 15 –12 Nishi Shinbashi, 2 – Chome,

Minato – Ku, Tokyo 105-8430, Japan.

HITACHI EUROPE LTD,

Whitebrook Park
Lower Cookham Road
Maidenhead
Berkshire
SL6 8YA

UNITED KINGDOM

Tel: [phone]
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HITACHI EUROPE GmbH

Munich Office
Dornacher Strasse 3
D-85622 Feldkirchen bei München

GERMANY

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HITACHI EUROPE srl

Via Tommaso Gulli N.39, 20147
Milano, Italia

ITALY

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Email: [e-mail]

HITACHI EUROPE S.A.S

Lyon Office
B.P. 45, 69671 BRON CEDEX
FRANCE
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HITACH EUROPE AB

Egebækgård
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DENMARK

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Hitachi Europe Ltd

Bergensesteenweg 421
1600 Sint- Pieters-Leeuw

BELGIUM

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www.hitachidigitalmedia.com

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152 33 Chalandri
Athens

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HITACHI EUROPE S.A.

Gran Via Carlos III, 101- 1
08028 Barcelona

SPAIN

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HITACHI Europe AB
Box 77 S-164 94 Kista

SWEDEN

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HITACHI EUROPE LTD (Norway) AB
STRANDVEIEN 18
1366 Lysaker
NORWAY
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HITACHI EUROPE AB

Neopoli / Niemenkatu 73
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HITACHI EUROPE LTD

Na Sychrove 975/8
101 27 Praha 10 – Bohdalec

CZECH REPUBLIC

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