Sunday, January 22, 2023

Samsung HT- BD1255 5.1CH Blu-ray Home Theater System Disassembly, firmware update, region code setting and SMPS schematics for 110 and 220 volts

 

DECK Disassembly & Reassembly

Ass'y Cover

1) Remove 4 Screws 1.
2) Lift up the Ass’y Cover 2 in direction of arrow.


Tray Disc

1) Insert a Screw Driver into Hole 1 and rotate Tray Gear 2 in the direction arrow
“Open”.
2) When the Tray Disc 3 Comes out a little, pull it in the direction arrow “A” by hand.
3) Pull the Tray Disc 3 to disassemble, while simultaneously pushing 2 Stoppers
4 (left, right) in the direction arrow “B”, “C”.


Ass'y P/U:  Deck

1) Remove FFC Cable 1, 2, 3.
2) Remove 4 Screws 4 from the Ass’y P/U Deck 5 and lift it up.


Ass'y Pick Up

1) Remove 1 Screw 1 from the Ass’y Hinge PU 2 and lift it up.
2) Pull Bracket Shaft PU 3 in the Direction of Arrow “A” and Remove Bracket Shaft
PU 3.
3) Lift Up Shaft P/U 4 and Remove the Ass’y Pick Up 5



1)Insert the Shaft P/U 2, 3 into the Ass’y pick up 1.
2) Assemble Bracket Shaft PU 4.
3) Insert the Ass’y Hinge PU 6 Assemble 1 Screw 5

Update methods
There are 3 Update methods
- CD Update
- Ethernet Update
- USB Update (New Feature)
F/W Update Method by CD

1.Insert update CD and close the tray

2. Tray will be opened.
3. Press Yes.

(If the update CD you inserted is a later one than Current Version)

4. Get rid off updare CD from Disk Tray.

5. wait about two to three minutes.

6 when finished, power automatically goes off.

Firmware update via network procedure

 F/W Update by USB

 

1. Insert the USB on the rear panel.

2. Press Yes.  (If USB you inserted has a later one than current version)

4.  wait about 2 to three minutes.

2. 5. When Finished, power automatically goes off

Cold Start Method (Initialize Setup)

This is useful for forgotten Parental Lock password.
2. Press ►| on the front panel for over 5 seconds while ‘no disc’ status.
3. Then, VFD sign: ‘COLD START’
4. System Micom Cold Start
: During Stand-By, just press  on the front panel for
over 5 seconds. Then, Red LED will go out and go on.

Buyer region code setting mehod.

The inserting region code method after replacing the Main PCB

Press the AUX button on the remote control.

Press the Marker button on the remote controller during 4 to 5 seconds.

After step (2), you can see “T-MODE” on the VFD and press
direction button “▼” during T-MODE.
Please remind that “T-MODE” indicator on the VFD is appeared for
a very short time.

After step (3), you can see “TEST - -” on the VFD.
Insert number “3”, “3” to select Region Code.

After step (4), you can see “- -” on the VFD.
Insert the Region Code (Below table) corresponding model with
“0 ~ 9” buttons on the remote control.

Region codes

After step (5), you can see “00 USA” on the VFD.
It means that currently System Micom (MUIC1) program is installed by USA specification

Turn the Power off.


SMPS CIRCUIT DIAGRAM for 110 volt

SMPS CIRCUIT DIAGRAM FOR 220 Volt


JBL PARTY BOX 100 BU Connected Home-How to disassemble, software upgrade and Reset, Schematic diagram, short circuit and thermal protection

 

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Audio Amplifier Section
Set all additional processing (tone controls, equalizers, audio effects, etc) to native or bypass, Set Unit on Test mode, set digital generator either off if not additionally defined. Output resistive load = 4Ω, 2 channels loaded. All voltage measurements are made with RMS detector,1kHz signal,10Hz~22kHz
BW, unless otherwise specified.

Speaker Output(Aux-in and BT/USB)

Short circuit, overvoltage and thermal protection

Software upgrade and system Reset

Restore factory setting
1. Power on, Hold down<PLAY> and <VOLUME +>keys on the top panel about 10 seconds.
2. Then, the unit will power off, the reset successful.
3. After factory settings restored, the unit will reboot automatically.
Check software Version
1. Power on, the unit is nothing input
No BT connection / No USB play / No AUX IN input.
2. Hold down <BASS BOOST> & <VOLUME - > keys on the top panel about 2 seconds.
3. The unit will voice playback software version.
4. The unit will exit the SW version speech mode automatically.
Software Upgrade via USB
1. Copy the firmware file (XXX.bin) into a USB flash drive.
2. Insert the USB flash drive to the set.
3. Hold down <VOLUME+> and < BT > keys on the top panel about 10 seconds. The right woofer LED will show red.
4. Starting to upgrade, The right woofer LED colour to white. White LED will display the upgrade progress.
5. Then, the unit will power off , the upgrade successful.
6. The unit will reboot automatically.

Disassembly procedures

How to dismantle PCBs

Dismantling of lighting PCBA and speaker drivers

Schematic diagram: Battery charge circuit

Circuit Diagram-MCU+DSP+AMP PCBA

Circuit Diagram-MCU+DSP+AMP PCBA

Power board (SMPS) schematic