Panasonic SA-BT235P User manual

© Panasonic Corporation 2010. All rights reserved.
Unauthorized copying and distribution is a violation
of law.
PSG1003054CE
A6
Blu-ray Disc Home Theater Sound System
Model No. SA-BT235P
Volume 1
Product Color: (K)...Black Type
Notes: 1) These model’s BD Drive/Main P.C.B. Assembly are:-
- RFKNBT235PA.
2) Please refer to the original service manual for:
• Speaker system SB-BT235P-K, Order No: PSG1001017CE.
Caution:
Pairing of BD Drive and Main P.C.B. as “BD Drive & Main P.C.B. Assembly” have to be replaced together. If
either BD Drive or Main P.C.B. is changed, BD Drive unit has to carry out re-adjustment due to alignment
data for BD Drive Unit is stored in the Main P.C.B.

2
TABLE OF CONTENTS PAGE PAGE
1 Safety Precautions -----------------------------------------------3
1.1. GENERAL GUIDELINES --------------------------------3
1.2. Before Repair and Adjustment--------------------------3
1.3. Protection Circuitry-----------------------------------------4
1.4. Safety Parts Information----------------------------------5
2Warning--------------------------------------------------------------6
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostatic Sensitive (ES) Devices---------------6
2.2. Precaution of Laser Diode-------------------------------7
2.3. Service caution based on Legal restrictions---------8
2.4. Handling Precautions for BD Drive--------------------9
3 Service Navigation----------------------------------------------10
3.1. Service Information--------------------------------------10
3.2. Caution for Replacing Parts--------------------------- 11
4 Specifications----------------------------------------------------12
5 Location of Controls and Components------------------14
5.1. Remote Control Key Button Operations------------14
5.2. Main Unit Key Button Operations --------------------15
5.3. Using BD-LIVE BONUSVIEW in BD-Video--------16
5.4. Using the iPod/iPhone----------------------------------17
5.5. Speaker Connections -----------------------------------19
5.6. Disc/Cards Playability ----------------------------------20
5.7. SD Information--------------------------------------------22
5.8. File Extension Type Support (MP3/JPEG/
AVCHD/MPEG2 files)-----------------------------------23
6 Operating Instructions ----------------------------------------25
6.1. Removing of disc during abnomality ----------------25
7 Self-Diagnostic and Special Mode Setting -------------26
7.1. Special Mode Table 1 -----------------------------------26
7.2. Special Mode Table 2 -----------------------------------27
7.3. Error Code Table -----------------------------------------28
7.4. Service Mode----------------------------------------------30
8 Troubleshooting Guide----------------------------------------35
8.1. Troubleshooting Guide for F61 and/or F76--------35
9 Service Fixture & Tools ---------------------------------------39
9.1. Service Tools and Equipment-------------------------39
10 Disassembly and Assembly Instructions---------------40
10.1. Disassembly Flow Chart--------------------------------41
10.2. Main Components and P.C.B. Locations-----------42
10.3. Disassembly of Top Cabinet---------------------------43
10.4. Disassembly of AC Inlet P.C.B.-----------------------44
10.5. Disassembly of Optical In P.C.B.---------------------45
10.6. Disassembly of Rear Panel----------------------------45
10.7. Disassembly of Front Panel Block Assembly -----46
10.8. Dissassembly of Panel P.C.B. ------------------------47
10.9. Dissassembly of Power Button P.C.B.--------------48
10.10. Replacement of Cradle Lid ----------------------------50
10.11. Disassembly of iPod Cradle Assembly-------------51
10.12. Disassembly of iPod/iPhone P.C.B. -----------------53
10.13. Replacement of DVD Lid Unit-------------------------54
10.14. Disassembly of Front Shield Plate Unit ------------56
10.15. Disassembly of BD Drive-------------------------------57
10.16. Disassembly of Main P.C.B.---------------------------63
10.17. Disassembly of D-Amp P.C.B. ------------------------64
10.18. Replacement of Digital Amplifier IC (IC5100/
IC5200) -----------------------------------------------------66
10.19. Disassembly of Power P.C.B.-------------------------67
10.20. Disassembly of SMPS P.C.B.-------------------------67
10.21. Replacement of Switching Regulator IC
(IC5701)---------------------------------------------------- 69
10.22. Replacement of Rectifier Diode (D5702)---------- 70
10.23. Replacement of Regulator Diode (D5802)-------- 72
10.24. Replacement of Regulator Diode (D5803)-------- 73
10.25. Disassembly of Fan------------------------------------- 74
11 Service Position------------------------------------------------- 76
11.1. Checking & Repairing Side B of Main P.C.B.----- 76
11.2. Checking & Repairing Side A of Main P.C.B.----- 76
11.3. Checking & Repairing D-Amp P.C.B.--------------- 78
11.4. Checking & Repairing SMPS P.C.B.---------------- 80
11.5. Checking & Repairing Panel P.C.B.----------------- 82
12 Voltage & Waveform Chart ---------------------------------- 84
12.1. Main P.C.B. (1/3)----------------------------------------- 84
12.2. Main P.C.B. (2/3)----------------------------------------- 85
12.3. Main P.C.B. (3/3)----------------------------------------- 86
12.4. Panel P.C.B. ---------------------------------------------- 87
12.5. D-Amp P.C.B. (1/2)-------------------------------------- 88
12.6. D-Amp P.C.B. (2/2)-------------------------------------- 89
12.7. Power P.C.B. --------------------------------------------- 89
12.8. SMPS P.C.B. --------------------------------------------- 90
12.9. Waveform Table------------------------------------------ 91
13 Illustration of ICs, Transistor and Diode---------------- 93
14 Block Diagram--------------------------------------------------- 95
14.1. Main(System Control) ---------------------------------- 95
14.2. Main(Audio) ----------------------------------------------- 96
14.3. Digital Audio----------------------------------------------- 98
14.4. Power Supply(Main Section) ------------------------- 99
15 Wiring Diagram-------------------------------------------------101
16 Schematic Diagram Notes----------------------------------103
17 Schematic Diagram-------------------------------------------105
17.1. Main(Micon/Tuner) Circuit----------------------------105
17.2. Panel Circuit ---------------------------------------------112
17.3. D-Amp Circuit--------------------------------------------113
17.4. SMPS Circuit---------------------------------------------117
17.5. Power, Power Button & AC Inlet Circuit-----------119
17.6. iPod/iPhone & Optical In Circuit --------------------120
18 Printed Circuit Board-----------------------------------------121
18.1. Main P.C.B.-----------------------------------------------121
18.2. Panel, Power, Power Button & AC Inlet P.C.B. -123
18.3. D-Amp P.C.B.--------------------------------------------124
18.4. SMPS P.C.B.---------------------------------------------125
18.5. iPod/iPhone & Optical In P.C.B.---------------------126
19 Terminal Function of ICs------------------------------------127
19.1. IC6001(C0HBB0000057): IC FL Driver-----------127
20 Exploded View and Replacement Parts List----------129
20.1. Exploded View and Mechanical replacement
Part List ---------------------------------------------------129
20.2. Electrical Replacement Part List--------------------135

3
1 Safety Precautions
1.1. GENERAL GUIDELINES
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3. After servicing, carry out the following leakage current checks to prevent the customer from being exposed to shock hazards.
1.1.1. LEAKAGE CURRENT COLD CHECK
1. Unplug the AC cord and connect a jumper between the two prongs on the plug.
2. Measure the resistance value, with an ohmmeter, between the jumpered AC plug and each exposed metallic cabinet part on
the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the
chassis, the reading should be between 1MΩand 5.2MΩ.
When the exposed metal does not have a return path to the chassis, the reading must be
(This “Safety Precaution” is applied only in U.S.A.)
1. Before servicing, unplug the power cord to prevent an electric shock.
2. When replacing parts, use only manufacturer’s recommended components for safety.
3. Check the condition of the power cord. Replace if wear or damage is evident.
4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
5. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to prevent
the customer from being exposed to a shock hazard.
1.1.2. LEAKAGE CURRENT HOT CHECK
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a 1.5kΩ, 10 watts resistor, in parallel with a 0.15µF capacitors, between each exposed metallic part on the set and a
good earth ground such as a water pipe, as shown in Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reverse the AC plug in the AC outlet and repeat each of the above measurements.
6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent)
may be used to make the hot checks, leakage current must not exceed 1/2 milliamp. In case a measurement is outside of the
limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is
returned to the customer.
Figure 1
1.2. Before Repair and Adjustment
Disconnect AC power to discharge unit AC Capacitors as such (C5700, C5701, C5702, C5703, C5705, C5706) through a 10 Ω, 10
W resistor to ground.
Caution:
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
Current consumption at AC 120 V, 60 Hz in NO SIGNAL mode volume minimal should be ~ 900 mA.

4
1.2.1. Caution for fuse replacement
1.3. Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
• No sound is heard when the power is turned on.
• Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.

5
1.4. Safety Parts Information
Safety Parts List:
There are special components used in this equipment which are important for safety.
These parts are marked by ( ) in the Schematic Diagrams & Replacement Parts List. It is essential that these critical parts
should be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the original design
without permission of manufacturer.
Safety Ref. No. Part No. Part Name & Description Remarks
2 REX1395-1 BLACK WIRE (AC INLET-SMPS)
3 REX1396-1 RED WIRE (AC INLET-SMPS)
20 RGRX1001Q-A REAR PANEL
29 RKMX1002-K TOP CABINET
49 RFKNBT235PA BD DRIVE / MAIN P.C.B ASS'Y
101 VQL1V70-J LASER CAUTION LABEL
A2 K2CB2CB00021 AC CORD
A3 VQT2M13-5 OI BOOK
PCB1 RFKNBT235PA BD DRIVE / MAIN P.C.B. ASS'Y
PCB5 REPX0803K SMPS P.C.B. (RTL)
PCB6 REPX0803K AC INLET P.C.B. (RTL)
DZ5701 ERZV10V511CS ZNR
L5702 G0B612H00002 LINE FILTER
L5703 G0B932H00002 LINE FILTER
T5701 ETS42BM1GGAC TRANSFORMER
T5751 ETS19AB2A6AG SUB TRANSFORMER
T6100 G4D1A0000142 SWITCHING TRANSFORMER
PC5702 B3PBA0000402 PHOTO COUPLER
PC5720 B3PBA0000402 PHOTO COUPLER
PC5799 B3PBA0000402 PHOTO COUPLER
RY701 K6B1AEA00003 RELAY
F1 K5D802APA008 FUSE
TH5702 D4CAA2R20001 THERMISTOR
P5701 K2AB2B000007 AC INLET
C5700 F1BAF1020020 1000pF
C5701 F0CAF104A105 0.1uF
C5702 F0CAF104A105 0.1uF
C5703 F0CAF104A105 0.1uF
C5705 F1BAF2220023 2200pF
C5706 F1BAF471A013 470pF

6
2Warning
2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatic Sensitive
(ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Elec-
trostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage
caused by electrostatic discharge (ESD).
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your
body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,
which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as alumi-
num foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static (ESD protected)” can
generate electrical charge sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most
replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or compara-
ble conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be installed.
Caution:
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the
brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) suf-
ficient to damage an ES device).

7
2.2. Precaution of Laser Diode
Caution:
This product utilizes a laser diode with the unit turned “on”, invisible laser radiation is emitted from the pickup lens.
Wavelength: 790 nm (CDs), 655 nm (DVDs), 405 nm (BDs)
Maximum output radiation power from pickup: 100 µW/VDE
Laser radiation from the pickup unit is safety level, but be sure the followings:
1. Do not disassemble the pickup unit, since radiation from exposed laser diode is dangerous.
2. Do not adjust the variable resistor on the pickup unit. It was already adjusted.
3. Do not look at the focus lens using optical instruments.
4. Recommend not to look at pickup lens for a long time.

8
2.3. Service caution based on Legal restrictions
2.3.1. General description about Lead Free Solder (PbF)
The lead free solder has been used in the mounting process of all electrical components on the printed circuit boards used for this
equipment in considering the globally environmental conservation.
The normal solder is the alloy of tin (Sn) and lead (Pb). On the other hand, the lead free solder is the alloy mainly consists of tin
(Sn), silver (Ag) and Copper (Cu), and the melting point of the lead free solder is higher approx.30 degrees C (86°F) more than that
of the normal solder.
Definition of PCB Lead Free Solder being used
Service caution for repair work using Lead Free Solder (PbF)
• The lead free solder has to be used when repairing the equipment for which the lead free solder is used.
(Definition: The letter of “PbF” is printed on the PCB using the lead free solder.)
• To put lead free solder, it should be well molten and mixed with the original lead free solder.
• Remove the remaining lead free solder on the PCB cleanly for soldering of the new IC.
• Since the melting point of the lead free solder is higher than that of the normal lead solder, it takes the longer time to melt the
lead free solder.
• Use the soldering iron (more than 70W) equipped with the temperature control after setting the temperature at 350±30 degrees
C (662±86°F).
Recommended Lead Free Solder (Service Parts Route.)
• The following 3 types of lead free solder are available through the service parts route.
RFKZ03D01K-----------(0.3mm 100g Reel)
RFKZ06D01K-----------(0.6mm 100g Reel)
RFKZ10D01K-----------(1.0mm 100g Reel)
Note
* Ingredient: tin (Sn), 96.5%, silver (Ag) 3.0%, Copper (Cu) 0.5%, Cobalt (Co) / Germanium (Ge) 0.1 to 0.3%
The letter of “PbF” is printed either foil side or components side on the PCB using the lead free solder.
(See right figure)

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2.4. Handling Precautions for BD Drive
The laser diode in the optical pickup unit may break down due to static electricity of clothes or human body. Special care must be
taken avoid caution to electrostatic breakdown when servicing and handling the laser diode in the BD Drive.
Figure 1
2.4.1. Grounding for electrostatic breakdown prevention
Some devices such as the DVD player use the optical pickup (laser diode) and the optical pickup will be damaged by static electric-
ity in the working environment. Proceed servicing works under the working environment where grounding works is completed.
2.4.1.1. Worktable grounding
1. Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed, and ground the sheet.
2.4.1.2. Human body grounding
1. Use the anti-static wrist strap to discharge the static electricity form your body.
Figure 2

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3 Service Navigation
3.1. Service Information
This service manual contains technical information which will allow service personnel’s to understand and service this model.
Please place orders using the parts list and not the drawing reference numbers.
If the circuit is changed or modified, this information will be followed by supplement service manual to be filed with the original ser-
vice manual.
•BD Drive & Digital Circuitries:
1) This service manual does not contain the following information, due to the impossibility of servicing at
component level.
- Exploded View and Replacement Parts List for individual parts of BD Drive.
2) The following category are recycle module part. Please send them to Central Repair Center.
- BD Drive & Main P.C.B. Assembly (RFKNBT235PA)

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3.2. Caution for Replacing Parts
3.2.1. Items that should be done after replacing parts
Note 1:
Download latest Firmware and burn it on CD-R or CD-RW, and update Firmware.
3.2.2. Standard Inspection Specifications after Making Repairs
After making repairs, we recommend performing the following inspection, to check normal operation.
Use the following checklist to establish the judgment criteria for the picture and sound.
No. Procedure Item to Check
1 Turn on the power, and confirm items pointed out. Items pointed out should reappear.
2 Insert RAM disc. The Panasonic RAM disc should be recognized.
4 Perform playback for one minute using the RAM disc. No abnormality should be seen in the picture, sound or operation.
*Panasonic DVD-RAM disc should be used when recording and play-
back.
5 Perform playback for one minute using the BD-Video disc. No abnormality should be seen in the picture, sound or operation.
6 If a problem is caused by a BD-Video disc, VCD, DVD-R, DVD-
Video, Audio-CD, or MP3, playback the test disc. No abnormality should be seen in the picture, sound or operation.
7 After checking and making repairs, upgrade the firmware to the
latest version. Make sure that [UPD OK] appears in the FL displays. *[UNSUPPORT] display means the unit is already updated to newest
same version. Then version up is not necessary.
8 Transfer [9][9] in the service mode setting, and initialize the ser-
vice settings (return various settings and error information to
their default values. The laser time is not included in this initial-
ization).
Make sure that [CLR] appears in the FL display.
After checking it, turn the power off.
Item Contents Check Item Contents Check
Picture Block noise Sound Distorted sound
Crosscut noise Noise (static, background noise, etc.)
Dot noise The sound level is too low.
Picture disruption The sound level is too high.
Not bright enough The sound level changes.
Too bright
Flickering color
Color fading

12
4 Specifications
Main unit SA-BT235P
OGENERAL
Power supply: AC 120 V,60 Hz
iPod/iPhone Connector: DC OUT 5V 500mA MAX
Power consumption: 90 W
Power consumption in standby mode: Approx. 0.1 W
Dimensions (W×H×D): 430 mm×54 mm×287 mm
(16 15/16”X2 9/64”X11 5/16”)
Mass (Weight): Approx. 3.2 kg (7.1lbs)
Operating temperature range: 0 °C to 40 °C
(+32 °F to 104 °F)
(no condensation)
OAMPLIFIER SECTION
DIN TTL Power Output: 310 W
1 kHz, 1.0 % total harmonic distortion
Front: 100 W per ch (3 Ω)
100 Hz, 1.0 % total harmonic distortion
Subwoofer: 110 W per ch (6 Ω)
OAMPLIFIER SECTION
RMS TTL Power Output: 1000 W
1 kHz, 10 % total harmonic distortion
Front: 125 W per ch (3 Ω)
Center: 250 W per ch (6 Ω)
Surround: 125 W per ch (3 Ω)
100 Hz, 10 % total harmonic distortion
Subwoofer: 250 W per ch (6 Ω)
FTC TTL Power Output: 446 W
120 Hz to 20 kHz, 1.0 % total harmonic distortion
Front: 60 W per ch (3 Ω)
Center: 106 W per ch (6 Ω)
Surround: 60 W per ch (3 Ω)
45 Hz to 120 Hz, 1.0 % total harmonic distortion
Subwoofer: 100 W per ch (6 Ω)
Audio input
AUX x1
Digital audio input
Optical: x2
Sampling frequency: 32 kHz, 44.1 kHz, 48 kHz
Audio Format: PCM, Dolby Digital
OFM TUNER SECTION
Frequency range: 87.9 MHz to 107.9 MHz (200 kHz step)
87.5MHz to 108.0MHz (100 kHz Step)
Antenna terminals: 75 Ω(unbalanced)
OVIDEO SECTION
Signal system: NTSC
Video output
Output level: 1.0 Vp-p (75 Ω)
Output connector: Pin jack (1 system)
HDMI AV output
Output format: 1080p/1080i/720p/480p
Output connector: Type A (19 pin)
HDMI (Deep Color,x.v.ColorTM,
High Bit rate Audio )
This unit supports “HDAVI Control 5” function.
LASER Specification
Class I LASER Product
Wave length: 790 nm (CDs)/655 nm (DVDs)/405 nm (BDs)
Laser power:
No hazardous radiation is emitted with the safety protection
TERMINAL SECTION
Ethernet: 10BASE-T/100BASE-TX
1system
SD card slot: Connector : 1 system
Note:
1. Specifications are subject to change without notice.
Mass and dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum
analyzer.
Solder:This model uses lead free solder (PbF).

13

14
5 Location of Controls and Components
5.1. Remote Control Key Button Operations

15
5.2. Main Unit Key Button Operations

16
5.3. Using BD-LIVE BONUSVIEW in BD-Video

17
5.4. Using the iPod/iPhone

18
5.4.1. iPod /iPhone Playback

19
5.5. Speaker Connections
Connect to the terminals of the same colour.
Turn off all equipment before connection and read the appropriate operating instructions.
Do not connect the AC power supply cord until all other connections are complete.
AC IN
521
366
FRONT
CENTERSUBWOOFER
R L
43
3
SURROUND
R L
+
6Main unit
6PURPLE Subwoofer
5GREEN Center speaker
2RED Front speaker (Rch)
1WHITE Front speaker (Lch)
4GRAY Surround speaker (Rch)
3BLUE Surround speaker (Lch)
6 5 4 3 2 1

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5.6. Disc/Cards Playability