Panasonic SAHT730 - DVD THEATER RECEIVER Kurzanleitung

Technical Guide

5-DVD Changer Home Theater System

SC-HT730, SC-HT930 Models

Practical Servicing of

Start Up, Shutdown, and Video Circuits

Panasonic Services Company

National Training

B02

SA-HT730 / SAHT930 2

Prepared by

Herb Chin, & Joe Blanks

Panasonic Services Company

National Training

Warning

This service information is designed for experienced repair technicians only and is not designed for use by

the general public. It does not contain warnings or cautions to advise non-technical individuals of potential

dangers in attempting to service a product. Products powered by electricity should be serviced or repaired

only by experienced professional technicians. Any attempt to service or repair the product or products

dealt with in this service information by anyone else could result in serious injury or death.

Panasonic is a registered trademark of Panasonic North America

"HDMI, the HDMI logo and High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC."

BBE, the BBE logo, Sonic Maximizer and High Definition Sound are registered trademarks or trademarks of BBE Sound, Inc.

Photoshop is a registered trademark of Adobe Systems Incorporated in the United States or other countries.

Dolby is a registered trademark of Dolby Laboratories.

DTS is a re

istered trademark of Di

ital Theater S

stems Cor

oration.

SA-HT730 / SAHT930 3

Table of Contents

OBJECTIVE............................................................................................................................. 4

I NO START-UP AND DVD TRANSPORT PROBLEMS................................................. 5

1. POWER-ON START-UP SEQUENCE –WHERE IS THE PROBLEM?........................................... 5

2. SENSORS,BELTS,AND MOTOR LOCATION ............................................................................ 6

3. SIMULATED FAILURE SYMPTOMS –QUICK FIXES................................................................. 7

4. TRAY REMOVAL FOR SENSORS,BELTS,&DIAGNOSTIC ACCESS......................................... 8

5. TRAY INSTALLATION (AFTER REPAIRS)................................................................................ 9

6. SENSOR TESTING ............................................................................................................... 10

Testing the Tray Loading Motor and Related Sensors .................................................... 10

Testing the Tray Rotation Motor and Related Sensors.................................................... 11

II SHUTDOWN PROBLEM................................................................................................ 12

PROTECTION CONCEPT –ALL THE SHUTDOWN POSSIBILITIES................................................ 12

Overall Repair Strategy ................................................................................................... 12

CONTROL UNIT REPAIR (SA-HT730 /SA-HT930) STRATEGY ............................................. 13

Control unit repair Procedure......................................................................................... 14

Jumper Paths to System Control IC2018 for Shutdown Problems.................................. 15

Control Unit Protection Concept..................................................................................... 16

SUBWOOFER UNIT REPAIR (SB-WA730 /SA-WA930)........................................................ 17

Subwoofer Repair Strategy – Start by isolaating the problem......................................... 17

Subwoofer Repair Procedure........................................................................................... 18

Subwoofer Disassembly ................................................................................................... 20

Subwoofer Test / Operating Position............................................................................... 21

III NO AUDIO PROBLEMS............................................................................................... 22

How to trace down no audio (one or more channels)...................................................... 22

SA-HT730 / SAHT930 4

Objective

This technical guide was prepared with the following objectives in mind:

•Provide the servicer with a brief overview of the concepts of operation for new

circuits employed in this line of models.

•Provide drawings with emphasis on signal path to simplify the task of signal

tracing and to locate the cause of a defect.

•Furnish troubleshooting procedures that contribute to a speedier repair of the

product.

•Provide examples of typical problems that may have occurred in similar types of

circuits.

SA-HT730 / SAHT930 5

I No Start-Up and DVD Transport Problems

Model: SA-HT730 / HT930. Since this unit normally starts in DVD mode, start-up

symptoms are often caused by DVD transport problems – A failure in the DVD

transport stops the start up.

Servicing the DVD section is divided into 6 groups (pick and choose what you need):

1. Power-On Sequence 4. Tray Removal for Diagnostic Access

2. Sensors, Belts and Motor Location 5. Tray Installation (after Repairs)

3. Simulated Sensor Failure Symptoms 6. Sensor testing

Start with the power-on sequence. The power-on sequence is important for

identifying the section that does not start. Compare the sequence in the defective

unit to the correct sequence listed below in table 1. The step where the unit stops

working is where the problem is (or in the step just before). Testing the sensors is

the next diagnostic step (section 6) if the transport works but behaves out of

sequence. Section 2 locates the sensors. However access to the sensors for testing

is tricky but the trick is revealed in section 4 - tray removal. After repairs, section 5

shows how to align the gears for reassembly.

1. Power-On Start-Up Sequence – Where is the problem?

After AC is disconnected, the unit always powers on into the DVD operation mode.

SA-HT730 / HT930 Power ON sequence

Step Time Operation Display Proof

1. 0 AC input. Unit off. None Red light over pwr button

(standby).

2. 0 Press Power button Disc # 1-5 light in sequence.

3. 1 sec “Hello”

appears All disc numbers 1-5 light.

4. 4 sec Micro IC8001 controls laser

assembly via cable to

CN2004. See table 2. “INIT” appears Disc proof sequence is followed *

see table 2.

5. 5 sec Loading motor moves the

Tray in (if S9001 is not open)

and into the disc unchucked

position using two loading

sensors.

No movement will occur if the

transport is already in this tray

in unchucked position.

“Please Wait”

Two loading sensors are used:

1. S9001 = contacts open / tray

closed. Contacts are open if the

Tray is in.

2. Q9001 at CN2011/6 = 0Vdc =

non-clamped position (tray

rotation is possible when the

disc assembly is unclamped.)

6. 8

sec. 1. Disc Tray motor rotates.

Slow rotation is first.

2. Detection of discs on platter

/ tray.

“Please Wait”

1. S9102 detects tray motor gear

rotation.

2. Q9103 detects each disc when

the disc blocks the Q9103 light.

7. 17 Tray motor stops at original

disc slot. “ No Disc” S9101 also detects tray rot.

position.

Table 1

SA-HT730 / SAHT930 6

* Disc Proof Sequence (no disc loaded) Checkout

Failure

a) Sled moves to home position (at

center). f) Sled moves out to DVD TOC

location. 1. Ribbon cable

b) Sled moves out to DVD TOC

location. g) Laser ON. 2. Mechanical

binding

c) Laser ON. h) Focus search 3X. 3. Volts missing

d) Focus search 3X. (spins if disc is

found) i) Sled moves to home position 4. Traverse

Motor

e) Sled moves to home position (at

center). j) Sled moves out to initial position. 5. IC8251 –

motor drive

Table 2

2. Sensors, belts, and motor location

Items in dotted lines are under the tray. Since many parts are under the tray, the tray

must be slid out to test the parts. This is easier than it looks. Use disassembly section

4 to access the parts shown below.

Part numbers

Tray Belt = RDV0073

Loading Belt = RDV0073

Loading Motor = REM0112

Tray Motor = same as above

SA-HT730 / SAHT930 7

3. Simulated Failure Symptoms – quick fixes

Although sensor failures cause the following symptoms listed in table 3, the more

common failure is an internally broken ribbon cable that carries the sensor signal to

the microprocessor.

To determine which is at fault, begin testing using figures 4 and 5 or order the cable

with the corresponding sensor. For example the motors (#6 & #7 in table 3) and

S9001 (#4) can be quickly checked with an ohmmeter at the CN2010/2011 cable end

(see figures 4 or 5). If the part tests bad bypass the cable and recheck the part right

at the part’s terminal.

CN2010 ribbon cable p/n = REZ1484 (11 pins)

CN2011 ribbon cable p/n = REZ1483 (10 pins)

Simulated Failures

Sensor Cable Symptom Comments

1. Disc Det Q9103

open CN2010 No disc detected (no PB possible).

2. Tray rotation Q9102

open. CN2010 Tray motor rotates back & forth for ¼ rotation then

shuts down. H01 error code shown. Unit shuts

down.

3. Tray position

Q9101 open. CN2010 Slow continuous CCW rotation of the tray. “INIT”

appears and no buttons work except power. Unit does not

shutdown.

4. Main gear position

Q9001 open. CN2011 Tray moves out and spins, then the tray moves in.

and the mech clamps & then unclamps. Repeats. Unit does not

shutdown.

5. Tray out switch

S9001 open. CN2011 Normal start up. Pressing the open tray button

permits the tray to open but it closes

automatically.

Tray will not

stay open.

6. Tray Loading Motor CN2011 Front panel display = “Please Wait” or

“Open/Close”

7. Tray Rotation Motor CN2010 Front panel display = “Please Wait”

Motor = 14

ohms

Table 3

SA-HT730 / SAHT930 8

4. Tray Removal for Sensors, Belts, & Diagnostic Access

Removing the tray to access the sensors and motor first requires removing the tray

trim, and then the front panel (not shown) before the tray assembly will come out.

Follow figure 2 for easy tray removal. CAUTION – metal chassis edges are sharp.

Quick Procedure:

1. Rotate the white Close Lock Gear / lever CW (clockwise) within the turntable

platter to unlock the tray. Pull the tray forward (towards yourself) until it stops.

2. From the bottom of the black tray, remove the front silver trim piece (not

shown).

3. Unplug the two front panel cables (CN2008 & CN2009) and remove the front

panel (not shown).

4. On the main board, remove the cable (CN2010) attached to the tray.

5. Move the rear white lever counter-clockwise (CCW) as shown in figure 2 and

at the same time

6. Release the two parallel tray stops (a and b) by pressing the larger tab

(closest to you) inward toward the center of the tray (figure 2).

7. Slide the tray out towards yourself to expose the sensors, motors, and belt.

Figure 2 – Tray removal revealed

CN2010

Contacts = rear

CN2008

Contacts = left

CN2009

Contacts = rear

6a 6b

2. Remove

trim from

the bottom.

SA-HT730 / SAHT930 9

5. Tray installation (after repairs)

Refer to figure 3. Positioning the main black gear and a white gear is all that is

required to slide the tray back in.

Procedure:

1. Main black gear – Rotate the gear so that its hole is at the 5 o’clock position

and its line across the gear is horizontal as shown in figure 3. In this gear

position, the laser assembly is clamped.

2. White gear – Rotate the (now free moving) left white gear so that its top

molded in lines point towards the rear as shown.

3. Without crushing the tray’s ribbon cable, slide the tray halfway into the

mechanism.

4. Plug in the tray’s ribbon cable into CN2010. The cable’s contacts face

rearward.

5. Push the tray all the way in.

SA-HT730 / SAHT930 10

6. Sensor testing

These 7 electrical parts could cause transport problems but so can a broken

mechanical part. Test all 5 sensors and 2 motors as a group once the tray is

removed. If the parts test OK, the problem is mechanical or a ribbon cable is bad.

Testing the Tray Loading Motor and Related Sensors

With the tray removed (section 4), install the front panel to test the tray loading

operation. Plug in front panel ribbon cables CN2008 and CN2009.

Testing Parts 1/2

Part Setup Do / Watch Proof the part is good

1. Tray

in – out

motor

1. Rotate the

main gear to the

disc clamped

position.

2. Press power

on.

After laser focus searches (“INIT”), the

loading motor turns to drive the

transport to the non-clamped position

(“WAIT”). The unit will then shut down

(“H01 error”).

Motor must turn belt and the

main black gear into the disc

unclamped position. Motor

resistance = 14 ohms. Motor

volts = 8Vdc. Between

CN2011/pins 8 & 10.

2. Tray

out sw.

S9001

Unplug the unit

from AC power. Measure the resistance between

CN2011 / pin 1 and pin 2. The switch is normally open

but shorted when pressed

(simulates tray out).

3. Main

gear

position

Q9001

Press the power-

on button. Rotate the main gear to the position

shown in figure 4 inset so that you can

see the sensor in the cutout. Rocking

the gear changes Q9001’s logic state.

The voltage at CN2011/pin 6

will change from 0.1Vdc to

4.6Vdc as you rotate the main

gear to block Q9001’s light.

Table 4

S9001 tray in / out test

Shorted - Tray out

Open – Tray in

[Front panel displays the

words “Open” or “Close”.]

Q9001 Main gear

position sensor test

CN2011 / pin 6 =

0.1V – 4.6Vdc as gear

is rotated

Figure 4 – Loading (Tray In – Out) Motor Circuit

Cutout shows Q9001

Main black gear position for

Q9001 sensor inspection

Inset

Main gear position

sensor S9001

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