Sanyo DP42746 Schematic

Specifications

Power Rating . . . . . . . . . . . . . . . . . . . . . . . . 120VAC

351W, 4.2A (Max)

Antenna Input Impedance . . . . . . . . . . . . . . . . . 75Ω

UHF/VHF/CATV

Digital

Receiving Channel . . . . . . . . . . . . . . . . 2 - 13 (VHF),

14 - 69 (UHF),

01, 14-94, 95-125 (CATV)

1-99 (Digital)

Remote Ready . . . . . . . . . . 32 Key Remote Control

Sound Output . . . . . . . . . . . . . . . . . . . . . . 5.0 W/CH

Intermediate Frequency

Picture IF Carrier. . . . . . . . . . . . . . . . . . 45.75MHz

Sound IF Carrier . . . . . . . . . . . . . . . . . . 41.25MHz

Color Sub Carrier . . . . . . . . . . . . . . . . . 42.17MHz

Cabinet Dimensions

Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1206mm

Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 720mm

Depth including base . . . . . . . . . . . . . . . . 248mm

REFERENCE No. SM780114

DP42746, J3TZ, PRODUCT CODE 111009300

Contents

Safety Instructions . . . . . . . . . . . . . . . . . . 2

Service Adjustments . . . . . . . . . . . . . 3 – 5

Power Failure Circuit . . . . . . . . . . . . . . . . 6

Mechanical Disassemblies. . . . . . . . 7 – 12

Chassis Electrical Parts List . . . . . . 13 – 20

Cabinet Parts List . . . . . . . . . . . . . . . . . . 21

Component and Test Point

Locations . . . . . . . . . . . . . . . . . . . 22 – 24

Block Diagrams . . . . . . . . . . . . . . . . 25 – 28

Trouble Shooting Flow Charts . . . . 29 – 31

Control Port Functions. . . . . . . . . . . 32 – 33

Schematic Notes . . . . . . . . . . . . . . . . . . . 34

Pin Layouts. . . . . . . . . . . . . . . . . . . . . . . . 35

Capacitor and Resistor Codes . . . . . . . . 36

Board Connections . . . . . . . . . . . . . 37 – 40

Schematic Diagrams . . . . . . . . . . . . 41 – 44

AS

FILE NO.

SERVICE MANUAL Remote Control Plasma

Color Television

DP42746 (U.S.A.)

(CANADA)

ORIGINAL VERSION

Chassis No. 42746-00

NOTE: Match the Chassis No. on

the unit’s back cover with
the Chassis No. in the
Service Manual.

If the Original Version
Service Manual Chassis
No. does not match the
unit’s, additional Service

Literature is required. You
must refer to “Notices” to the
Original Service Manual
prior to servicing the unit.

Servicing should be performed by only trained and qualified service personnel.

with a double “Z” is a registered trademark

of Sanyo Manufacturing Corporation.

© Sanyo Manufacturing Corporation 2006

AS

— 2 —

SAFETY PRECAUTIONS

WARNING: The chassis of this receiver has a floating
ground with the potential of one half the AC line voltage in
respect to earth ground. Service should not be attempted by
anyone not familiar with the precautions necessary when
working on this type of equipment.

The following precautions must be observed:

1. An isolation transformer must be connected in the power
line between the receiver and the AC line before any ser­vice is performed on the receiver.

2. Comply with all caution and safety-related notes provided
inside the cabinet, on the chassis, and on the back.

3. When replacing a chassis in the cabinet, always be certain
that all the protective devices are installed properly, such
as control knobs, adjustment covers, shields and barriers.

4. Before replacing the back cover of the set, thoroughly
inspect the inside of the cabinet to see that no stray parts
or tools have been left inside.

Before returning any television to the customer, the
service technician must perform the following safety
checks to be sure that the unit is completely safe to
operate without danger of electrical shock.

ANTENNA COLD CHECK

Remove AC plug from the 120 VAC outlet and place a
jumper across the two blades. Connect one lead of an ohm­meter to the jumpered AC plug, and touch the other lead to
each exposed antenna terminal (UHF and VHF antenna ter­minals). The resistance must measure between 1M ohm and

5.2M ohm. Any resistance value below or above this range

indicates an abnormality which requires corrective action.

LEAKAGE CURRENT CHECK

Plug the AC line cord directly into a 120 VAC outlet. (Do not
use an isolation transformer for this check.) Use an AC volt­meter, that has 5000 ohms per volt or more sensitivity.
Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15 µF
150 VAC capacitor, between a known good earth ground
(water pipe, conduit, etc.) and all exposed metal parts of the
cabinet (antennas, handle bracket, metal cabinet, screw
heads, metal overlays, control shafts, etc.). Measure the AC
voltage across the 1500 ohm resistor. The AC voltage
should not exceed 750 mV. A reading exceeding 750 mV
indicates that a dangerous potential exists. The fault must
be located and corrected. Repeat the above test with the
receiver power plug reversed.

NEVER RETURN A RECEIVER TO THE CUSTOMER
WITHOUT TAKING THE NECESSARY CORRECTIVE ACTION.

PRODUCT SAFETY NOTICE

When replacing components in a receiver, always keep in
mind the necessary product safety precautions. Pay special
attention to the replacement of components marked with a
star () in the parts list and in the schematic diagrams. To
ensure safe product operation, it is necessary to replace
those components with the exact same PARTS.

SERVICING ELECTROSTATICALLY SENSATIVE DEVICES

Semiconductors (solid-state devices) that can be damaged
by static electricity are referred to as Electrostatically
Sensitive (ES) devices. Examples of typical ES devices are:
Integrated Circuits (IC), Field-Effect Transistors (FET), and
“chip” components. The following techniques should be
observed strictly, to reduce the occurrence of semiconduc­tor damage due to electrostatic discharge.

1. Immediately prior to handling any semiconductor com­ponent or an assembly containing a semiconductor
device or devices, discharge the electrostatic buildup on
your body by touching a known earth ground. You may
also obtain and wear a commercially available discharg­ing wrist strap device.

CAUTION: Be sure to remove the wrist strap before
applying power to any unit being serviced.

2. After removing an ES equipped assembly, place it on a
conductive surface, such as, aluminum foil, to prevent
buildup or exposure to static electricity.

3. Use only grounded-tip soldering irons to solder or unsol­der ES devices.

4. Use only anti-static solder removal devices. Some suc­tion-type devices can generate static electricity adequate
to damage ES devices.

5. A replacement ES device will come packaged in protective
material (conductive foam, aluminum foil, or some compa­rable conductive material). Do Not remove an ES device
from its protective packaging unless you are prepared to
install it immediately.

6. Precisely prior to removing an ES device from its protective
packaging, touch the protective packaging to the chassis or
assembly in which the device will be installed.

CAUTION: Be sure that no power is applied to the chassis or
circuit assembly.

7. Incidental body movements, such as, lifting a foot from a
carpeted floor or the rubbing of fabric together can gener­ate static electricity sufficient to damage ES devices.
Therefore, minimize all body movements while handling
exposed (unpackaged) ES devices.

SAFETY INSTRUCTIONS

AC OUTLET

READING SHOULD NOT EXCEED 750 mV.

(5000 ohms per volt or more sensitivity)

TELEVISION

RECEIVER

To be touched to all of exposed metal parts.

Voltmeter Hook-up for Leakage Current Check.

AC VOLTMETER

1500 ohm

10 watt

0.15 µF 150V AC

Good earth ground
such as a water pipe,
conduit, etc.

— 3 —

SERVICE ADJUSTMENTS

Volume – : Enter Service Menu

GENERAL

This set has an On-screen Service Menu system included in
the CPU that allows remote operation for most of the ser­vice adjustments.

ON-SCREEN SERVICE MENU SYSTEM

1. Enter the Service Menu:

•Turn off the receiver and disconnect the AC power

supply.

•While pressing the Volume (–) button on the televi-

sion, reconnect the AC power supply. The Service
Menu will now appear. The remote can now be used
to make adjustments. See Figure 1 below.

2. Service Adjustments:

•Press the Channel  or  key to select the desired

service menu item you want to adjust. See page 4
for the On-screen Service Menu.

•Use the Volume + or – key or number keys to adjust

the data.
The + or – keys will increase or decrease the data
sequentially. The number keys (0 ~ 7) toggle only
their respective bits between 1 and 0 and are used to
change the Sub-Address. For example to change bit
5 press the number 5 key. See below.

Note: Using the + or – is not recommended due to possi-

ble rapid changes.

3. Exit from the Service Menu:

•Press the MENU key to turn off the Service Menu

display.

(b7) (b6) (b5) (b4) (b3) (b2) (b1) (b0)

0 1 0 1 0 1 1 0

BINARY DATA
(8 bit)

080 ATT
07 00000111

Figure 1. Service Menu Display

ITEM NO.

TITLE

BINARY DATA
(8 bit)

HEX DATA

Menu:

Exit Service Menu

Volume + / –:

Adjust Service Menu

Numeric:

0, 1, 2, 3, 4, 5, 6, 7:

Change Binary Data

Channel  :

Select Item



POWER

CH



VOL

INPUT

POWER

1

2 3

4 5 6

7 809

INFO

RECALL

TUNER MUTE

MENU

SLEEP

ENTER

CAPTION EXIT

CH

VOL

RESET AUDIO PIX SHAPE

— 4 —

ON-SCREEN SERVICE MENU

• All data except in gray box area is fixed. Do not change for correct operation.

• Data in gray box is initial. Can be set according to adjustment information.

Table 1. ON-SCREEN SERVICE MENU

When IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below. The shaded menu should
be checked and be set up or readjusted according to the procedures described in the following pages. Initial Setup Data
marked with an * should be changed from Initial Reference Data. See page 3 for On-Screen Service Menu access and
adjustments.

PROGRAM CODES

The microprossesor used in this model is a multi-purpose type and is used in several different models. To ensure
proper operation and the correct features for your particular model, the program codes must be correct.

Note 1. Option Data 1 (NO. 087 OPT) should be hexadeci­mal 0A (00001010 binary). See 087 above. If this program

code is wrong the TV will not operate properly.

Note 2. Option Data 2 (NO. 088 OP2) should be hexadeci­mal 00 (00000000 binary). See 088 above. If this program

code is wrong the TV will not operate properly.

No. TITLE

INITIAL REFERENCE INITIAL SETUP INITIAL SETUP

FUNCTION

DATA HEX DATA HEX DATA BINARY

080 ATT 07 07 00000111 Attenuation -MTS Input Level (3~0)

081 SPC 20 20 00100000 Spectral - High Separation (5~3)

082 WDB 20 20 00100000 Wide Band - Low Separation (5~0)

083 SCO 00 00 00000000 Sub Color (NOT AVAILABLE)

084 STI 00 00 00000000 Sub Tint (NOT AVAILABLE)

085 SB 00 00 00000000 Sub Bright (NOT AVAILABLE)

086 SSH 00 00 00000000 Sub Sharpness (NOT AVAILABLE)

087 OP1 0A 0A 00001010 b7:PDP HD=0 b3:W/HDMI=1, PDP: b1,b0=10

088 OP2 00 00 00000000 b7:HD=0

08A PER 00 00 00000000 Temperature Failure History (No Failure = 0, Failure = 1)

PUT 0000 0000 00000000 Total Operation Time

1C0 ↓↓↓00000000 Not Used
1FF ↓↓↓↓Not Used

200 1R01 00 00 00000000 ROM Correction Data

↓↓ ↓ ↓ ↓↓

298 2R48↓ 00 00 00000000 ROM Correcetion Data

— 5 —

SERVICE ADJUSTMENTS (Continued)

MULTI-SOUND SECTION ADJUSTMENTS

Note: Multi-Sound Section must be adjusted after

A101 (U/V Tuner), IC3401 (MTS Decoder), Digital
Module or IC802 (EEPROM) is replaced.

INPUT LEVEL ADJUSTMENT

1. Connect a signal to the analog antenna terminal with
audio of 1 KH

Z 100% modulation.

2. Turn off the receiver and disconnect the AC power cord
(AC 120V line).

3. Connect voltmeter (RMS) to TP317 and ground on the
Main PC board.

4. While pressing the VOLUME – key, reconnect the AC
power cord. The Service Menu will now appear.

5. Select NO. 080 (ATT: MTS Input Level) with the  or 
key.

6. Adjust the + or – key for a voltmeter reading of 400 ±
20 mVrms at TP317.

Figure 2. Separation Adjustments

SEPARATION ADJUSTMENT

7. Turn off the receiver and disconnect the AC power cord
(AC 120V line).

8. Connect oscilloscope CH1 to TP317 and CH2 to TP318
and ground.

9. Connect an MTS TV/Stereo generator to antenna terminal.

10. While pressing the VOLUME – key, reconnect the AC
power cord. The Service Menu will now appear.

11.Select pilot, 300Hz audio frequency and Left modulating
signal.

12. Select NO. 082 (WDB: Wide Band) with the  or  key.

13. Adjust the + or – key for minimum low frequencies at
TP317. See Figure 2.

14. Select 4 KHz audio frequency and Right modulating signal.

15. Select NO. 081 (SPC: Spectral) with the  or  key.

16. Adjust the + or – key for minimum high frequencies at
TP318. See Figure 2.

Repeat adjustments (steps 11–16) until no further decreases
in amplitude can be obtained. Press the MENU key to turn
off the Service Menu display.

Minimize L leakage

TP317 (R)

300Hz

Minimize R leakage

TP318 (L)

4KHz

— 6 —

POWER FAILURE CIRCUIT

CPU (IC801) is programmed so the set will go to the stand­by mode when there is circuit failure as described below.
(Refer to”Power Supply Lines.”)

1. Power Failure : Detected voltage failure. (Connected to
IC801 pin 32.)

(Normal: High; Failure: Low)

2. Temperature Failure : Detected temperature failure for
Power Unit of PDP module. (Connected to IC801 pin 41.)

(Normal: Low; Failure: High)

LED Flashing

When IC801 detects the Power Failure 3 times the LED will
flash to indicate a power failure has occurred.

Note: The LED does not flash for Temperature Failures.

Note: If power failure is detected 3 times in 15 minutes, the

set will enter the standby mode and cannot be
switched On. To reset the operating programs of the
CPU it is necessary to disconnect the AC cord for a
short time.

History of Power Failure

When finishing the repair or stopping the Power Failure,
the history of past failures can be checked.

To see the history

1. Enter the service mode. See “Service Adjustments”
page 3.

2. Select Item No. 08A PER Temperature Error.

If Temperature Failure has accured the data in Item No.
08A will be 01h (1).

Attention:

After servicing, reset the data of Item No. 08A to 00h (0)
with the Volume + or – key.

Q801

Power On

Thermal Detector

D1607

11 10 3 4 9 5 6 11

D1606

D3.3V

K8B K8A

IC801 (CPU)

41

Power Fail

32

14

D1605 D1604 D1603 D1601

D5V

TV33V

12V AMP

Q803

A5V

D1602

4

IC1601

A9V

39

K8MA

DIGITAL

BOARD

POWER BOARD

— 7 —

MECHANICAL DISASSEMBLY

BACK CABINET REMOVAL – SIDES

Remove 24 screws to take the side cabinets off.
(A:3X8, 6pcs; B:4X12, 18pcs)

BACK CABINET REMOVAL– CENTER

Remove 31 screws to take the back cabinet off.
(C:3X8, 10pcs; D:4X12, 17pcs; E:6X18, 4pcs)

B

B

B

B

A

B

B

A

B

B

A

A

B

B

A

B

B

A

B

B

B

B

BB

D

D

D

D

D

D

D

C

C

E

E

C

C

C

D

D

D

C

C

C

C

D

E

E

C

D

D

D

D

D

D

— 8 —

BOARD LOCATIONS

1: MAIN BOARD REMOVAL

Remove 2 tuner nuts (Digital and Analog) and take off the
terminal base. Disconnect plugs K8MB, K8MA, K8A, K8B,
K8F, K8E, and KSP. Remove 11 screws (3X8: 2 types) to
take the main board with the shield case (assembly parts)
off.

2: D-TU BOARD REMOVAL

Remove the terminal base. Disconnect plug K8LV. Remove
5 screws (3X8) to take the D-TU (digital) board with the
shield case (assembly parts) off.

3: FILTER BOARD REMOVAL

Disconnect plug KAC. Remove 3 screws (3X8) to take the
filter board with the shield case (assembly parts) off.

4: KEY SW BOARD REMOVAL

Disconnect plug K8E. Remove a screw (4X12) to take the
key switch board with the panel, button, and holder
(assembly parts) off.

5: CONTROL BOARD REMOVAL

The control board can be taken off, after the filter glass is
removed. (Refer to ‘FILTER GLASS REMOVAL’.)

6: SPEAKER REMOVAL

Disconnect plug KSP. Remove 4 screws (4X10) to take off
each speaker.

MECHANICAL DISASSEMBLY (CONT.)

SCREW LOCATIONS

4

6 6

2

5

1

3

Hook

Terminal
Base

— 9 —

A

C

I

N 1

2

0

V

UH

F/

V

HF/

CA

T

V

D

I

G

I

TA

L

A

NT

E

N

N

A

I

N

S

E

RV

I

CE

D

I

G

I

TA

L

A

U

D

I

O
OU

T

P

U

T

H

D

MI
I

N

P

U

T

STAND REMOVAL

Position TV face down on a padded or cushioned surface to protect the screen and finish.

Remove 2 screws (6X18) from each foot and remove.

FILTER GLASS REMOVAL

1. Remove the key switch board.

2. Disconnect the following socket connections.
Control Board ~ Main Board: K8E
Speakers ~ Main Board: KSP

3. Remove 8 screws (4X8) to take the panel module, power unit,
and panel holders (Mounting Brackets) with boards off.

PLUG LOCATIONS

V

0
2
1

N
I

AC

ATV
C
/
F

H
V

F/
H
U

E
VIC
R

SE

L
A

N
I
A

IGIT

N

D

TEN

N

L

A
A
T
I

IG

IO

D

D

T

U

U

A

P

T
U
O

I

M
D
H

UT
P
IN

K8LV

K8B

K8A

K8MB

K8P

K8E

KSP

KAC

K8MA

— 10 —

FRONT CABINET REMOVAL

1. Remove 18 screws (F:4X12) to take the filter glass with upper and
lower plates (assembly parts) off.

2. Remove the speakers.

3. Remove a screw (4X10) to take the control board and holder off.

4. Remove 20 screws (G:3X8) to take the filter glass and upper plates off.

MECHANICAL DISASSEMBLY (CONT.)

FILTER GLASS REMOVAL (Cont.)

F

F

F

F

F

F F F F

F

F

F

F

F

F

F

F

F

G

G

G

G

G G G G

G

G

G G

G

GGGG

G

G

G

— 11 —

PANEL MODULE REMOVAL

1. Remove the key switch board.

2. Disconnect the following socket connections.
Main Board ~ Power Unit: CN8004, CN8007
D-TU Board ~ Power Unit: CN8010
Filter Board ~ Power Unit: CN8001
Control Board ~ Main Board: K8E
Speakers ~ Main Board: KSP
PDP Module ~ D TU Board K8LV

3. Remove the main board, D-TU board, and filter board.

4. Remove the 16 screws from the panel holders (Mounting
Brackets) to take the panel module off.

(H:4X8, 14pcs; I:5X10, 2pcs)

Control Board (Upper)
Holder (Lower)

H

H

H

H

H

H

H

I

H

H

H

H

I

H

H

H

H

H

H

HH

H

— 12 —

POWER UNIT REMOVAL

Remove 9 screws to take the power unit off.

ATTENTION

 This PDP TV uses several different kinds of

screws. Using the correct screw is required to

prevent damage.

 The gasket is provided to prevent interference

to other radio and television receivers. The
gasket must be returned to its previous position
after servicing.

 Lead wires must be redressed to previous posi-

tions after servicing.

MECHANICAL DISASSEMBLY (CONT.)