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       After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.

    The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part having
a return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.

1.

A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2.

A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.

3.

Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)

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• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)

Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40°C higher than

ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

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·········································································· 5

······································································ 6

········································································ 8

3-1. Circuit Board Location ·················································· 8
3-2. Block Diagrams – MAIN Section – ···························· 10

– DISPLAY/POWER Section – ··································· 11

3-3. Printed Wiring Board – DIGITAL Section – ··············· 12
3-4. Schematic Diagram – DIGITAL Section (1/2) – ········· 13
3-5. Schematic Diagram – DIGITAL Section (2/2) – ········· 14
3-6. Printed Wiring Board – MAIN Section – ···················· 15
3-7. Schematic Diagram – MAIN Section (1/2) – ·············· 16
3-8. Schematic Diagram – MAIN Section (2/2) – ·············· 17
3-9. Printed Wiring Board – DISPLAY Section – ·············· 18
3-10. Schematic Diagram – DISPLAY Section – ················· 19
3-11. Printed Wiring Board – VIDEO Section – ·················· 20
3-12. Schematic Diagram – VIDEO Section – ····················· 20
3-13. Printed Wiring Board – POWER Section – ················· 21
3-14. Schematic Diagram – POWER Section – ··················· 22
3-15. IC Block Diagrams ······················································ 23
3-16. IC PIN FUNCTION DESCRIPTIONS ······················· 25

······················································ 27

4-1. Front Panel Section ····················································· 27
4-2. Chassis Section-1 ························································ 28
4-3. Chassis Section-2 ························································ 29

······································· 30

Parts No.

MODEL

PARTS No.

K740P : US

4-238-189-2s

K740P : Canadian

4-238-189-3s

K740P : Malaysia,Singapore

4-238-189-4s

K740P : E

4-238-189-5s

K740P : AEP

4-238-189-6s

K740P : UK

4-238-189-7s

K840P : US

4-238-193-0s

K840P : Canadian

4-238-193-1s

K840P : Malaysia, Singapore

4-238-193-2s

K840P : E

4-238-193-3s

K840P : AEP

4-238-193-4s

K840P : UK

4-238-193-5s

K840P : Argentine

4-238-193-8s

K840P : Mexican

4-238-193-9s

5

This section is extracted
from instruction manual.

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90 qaqsqdqf qg qhqjqkqlw; waws

8

FM MODE (Models of area code

CEL, CEK only) ed, (Except for
models of area code CEL, CEK)
ef (32)

INPUT MODE qg (22)
IR (receptor) 4 (39, 46, 52)
LEVEL 0 (16, 20, 28, 57)

MASTER VOLUME wd (20, 50)
MD/TAPE qj (22)
MEMORY eh (31, 33)
MENU +/– e; (16, 28, 36, 37, 57)
MENU </> ea (16, 28, 36, 37, 57)
MODE wj (25, 30, 51)
MULTI CHANNEL DECODING

(indicator) (HT-DDW840 only)
7 (22)

MULTI CH IN (HT-DDW840

only) qf (22)

MUTING wf

8

 (22, 50)

NAME  

(36)

PHONES (jack) ek (22, 51)
PRESET/PTY SELECT +/–

(Models of area code CEL, CEK
only) 3 (33, 34)

PRESET TUNING +/– (Except

for models of area code CEL,
CEK) 3 (33, 54)

PTY (models of area code CEL,

CEK only) ef (34)

SET UP 6 (4, 16, 37, 57)
SHIFT eg (33)
SLEEP (HT-DDW740 only) qf

(37)

SURR qd (28, 57)

TREBLE +/– qh (30, 57)
TUNER ws (22, 32, 33, 36)
TUNING +/– 5 (32)
VIDEO 1 qk (22)
VIDEO 2 w; (22)

?/1 (power) 1 (4, 15, 20, 21,

30, 31, 54)

2 CH wh (26)

A.DEC wk (24, 26)
AM (Except for models of area

code CEL, CEK) es (31, 32)

BASS +/– wg (19, 30, 57)
CD ql (22)
CINEMA STUDIO EX A, B, C

9 (25)

Digital Cinema Sound (indicator)

qs (24)

DIMMER ej (23)
DISPLAY 2 (23, 34, 52)
Display qa 

 (23)

DVD/LD wa (22)

ENTER wl (36)
FM (Except for models of area

code CEL, CEK) ed (31, 32)

FM/AM (Models of area code

CEL, CEK only) es (31, 32)

ek

ej

eh eg ef ed es ea

e;

wl wk wj wh

wg

wf

wd

•

Abbreviation
CEK

: UK model.

CEL

: AEP model.

6

* All preset contents are reset to the default setting.
* Procedure:

While depressing the  VIDEO 1  and the  2CH  buttons simul-
taneously, press the power  ?/1  button to turn on the main power.
The message “FACTORY” appears and switch off the set.
While depressing the  VIDEO 1  and the  2CH  buttons simul-
taneously, press the power  ?/1  button again. The message
“FACTORY” appears and the present contents are reset to the
default values.

* Either the 9 kHz step or 10 kHz step can be selected for the AM

channel step.

* Procedure:

Set the FUNCTION to AM.  Turn off the main power.
While depressing the  TUNING+ button or the
PRESET+ button, press the power  ?/1  button to turn on the
main power.  Either the message “9 k STEP” or “10 k STEP”
appears.  Select the desired step.

* For US/Canadian/E model only

*Either Normal Speaker or Micro Satellite Speaker can be selected.
*Procedure:
 While depressing the  LEVEL  button, press the power  ?/1  button
to turn the main power.
Either the message “NORM. SP.” or “MICRO SP.” is displayed.
Select the desired speaker size.

* All fluorescent segments are tested.  When this test is activated,

all segments turn on at the same time, then each segment turns on
one after another.

* Procedure:

While depressing the  MD/TAPE  and the  SHIFT  buttons simul-
taneously, press the power  ?/1  button to turn on the main power.

1. All segments turn on.

MULTI CHANNEL DECODING , Digital Cinema Sound ,
A.F.D. , MODE , 2CH and SET UP LED turn on.

2. Press the  VIDEO  button, confirm display.

A.F.D. , MODE , LEVEL , SET UP , and Digital Cinema Sound
LED turn on.

3. Press the  VIDEO  button, confirm display

MULTI CHANNEL DECODING , 2CH , SURR and NAME
LED turn on.

4. Press the  VIDEO  button, All segments turn off.

5. Every pressing of the VIDEO  button turns on each

segment and LED one after another in the same order.
(Not only the  VIDEO  button, but also the other buttons such as
DVD/LD , TV/SAT , MD/TAPE , CD , TUNER and AUX can
be used.)

* The preset sound field is cleared when this mode is activated.

Use this mode before returning the product to clients upon
completion of repair.

* Procedure:

While depressing the  MODE  button, press the power  ?/1  button
to turn on the main power.
The message “SURR. CLR.” appears and initialization is
performed.

* Demonstration is performed.
* Procedure :

While depressing the  SET UP  button, press the power  ?/1
button. The message appears and demonstration is performed.

* To finish DEMONSTRATION MODE, press the power ?/1

button while the introduction message appears in the display.

* The software version is displayed.
* Procedure:

While depressing the ENTER and the A.F.D buttons
simultaneously, press the power  ?/1  button to turn on the main
power.  The model name, destination and the software version are
displayed.

* Button check
* Procedure:

While depressing the VIDEO 1 and the SHIFT buttons
simultaneously, press the power  ?/1  button to turn on the main
power.
“REST 39” appears. (AEP, UK, model: “RESET 38”)
Every pressing of any button other than  ?/1  and  SPEAKERS
counts down the buttons.  The buttons which are already counted
once are not counted again.  When all buttons are pressed “REST
00” appears.
When MASTER VOLUME is rotated in clockwise direction,
“VOL MIN”, “VOL 1” to “VOL 48”, “VOL MAX” appear.

SW

L

SL

C

R

S

SR

SLEEP

SP.OFF

( ( ( L F E ) ) )

DIGITAL

OPT COAX MULTI CH IN

PRO LOGIC DTS MPEGSTEREO MONO RDS

MEMORY

MUTING

INFO

NEWS

TA

EQ

D.RANGE

dB

kHz

mft.

MHz

SW

L

R

S

SLEEP

 L F E 

COAX

PRO LOGIC

MPEGSTEREO

RDS

MUTING

INFO

TA

D.RANGE

k    

m   

MHz

SL

C

SR

SP.OFF

( ( (       ) ) )

DIGITAL

OPT

MULTI CH IN

DTS

MONO

MEMORY

NEWS

EQ

dB

  Hz
   ft.