Schematic Diagrams

Sunday, August 21, 2016

Phonic Powerpod 620 – circuit diagram – Powered Mixer

Circuit Diagram (Schematic) - Phonic Powered Mixer - PowerPod-620

Controls

Circuit diagram

Philips 21PT9457- 55 – Flat CRT TV. Circuit diagram and adjustments

This chassis does not contain a specific Service mode. The Services and device setting can be made via Mode the Technical Assistance Factory.
There is no program on TV
Check method: Check the closed circuit to the tuner IC image encoder for detecting whether components defective. Or check if the resistance R117, R118, R203 and R204 has increased may cause the problem.
No Good Picture or Dual Image
Check the signal IF1 / IF2 to Q101 and relevant circuit. In this case the problem can be Q101 and / or SAW 101.
No Picture or Color Correct
• Check the circuit IC201 to RGB.
• Check the welding IC and physical damage of the relevant circuit or check defective capacitors.
Image with White Line Horizontal and Audio
Check voltage supply of vertical IC301 and circuit relevant, and check the vertical sync signal IC201.

Control Evil Operation Remote

Check voltage at pin 64 of IC201. The normal value should be 5.15V. If correct check the welding connections front control panel. If it cannot be resolved check remote control, remote transmission or crystal diode are in good condition.

Without audio

Check audio power IC (IC402) and relevant circuit.

Check BTSC panel, the power of the IC801 and signal output pins 21:27 this IC. Do not delete the IC801 and / or IC402 may be faulty. If necessary, replace the speakers.

Bad Quality Audio

Check the audio system after searching the channel that should be NTSC or AUTO. If the problem persists, check the panel circuit is good chassis or not.

Main voltage adjustment

To adjust the main voltage, connect a voltage meter the diode D610 and cathode VR601 adjustment to the voltage 110 V + -0.3V.

Circuit diagram (Schematic) and PWB [Click on the pictures to magnify]

SMPS (split)

Sub-woofer

Block diagram

Adjustment mode flow chart

Factory Mode adjustment procedure

Software settings

Place evenly-matched in the MENU mode (the default mode) as follows (see "Factory Mode" figure on the next page:

> Press the [i +] keys, "smart sound" and "smart picture" for enter the factory menu.

> Press the [i +] again and "ADJUST" appears on screen.

> Press the number keys to enter the set page, press the Up/Dn keys to change the items that have been set, press the Left/Right keys to adjust their values .

> Press [i +] to exit the factory mode.

The different parameter settings are described above.

Friday, August 19, 2016

Philips AZ1010 – CD Radio Cassette Recorder – Circuit Diagram

Tuner board

Combi board

Click on the schematics to zoom in

Sony MDS S9 – Circuit diagram – Minidisc Deck

MD mechanism type: MDM-7A

Optical pick-up name: KMS-260B

Display Board

BD Board

Main Board

Click on the schematics to magnify

Teledex 21NF55 – Teledex 21PF93 – How to enter service mode – Schematic diagram – CRT Television

DESIGN/SERVICE mode
To enter the USER SERVICE mode
Caution: The user service mode adjustment can be changed only when service personnel adjust the whole set data during servicing. As the control data have dramatic effects on functions and
performance of the TV, service personnel should not tell user how to enter the SERVICE mode to avoid improper data settings.
Set the volume to 0. Then press and hold the MUTE button on the remote control, and press the MENU button on the TV to enter the SERVICE mode. (In this case, the S mode cannot be stored in the EEPROM. To exit from the S mode, turn off the TV set.)
After entering the S mode, Red“ S”is displayed on the upper center of the screen and MENU1 is default. Use the POS+/- buttons to highlight an adjustment and the VOL+/- buttons to adjust
it. The adjusted data are immediately output and stored in the EEPROM.
EX-1A1 chassis series are applied in 21NF55/21PF93 respectively which uses mainly Philips’ advanced UOC-ultimate chip TDA935X/6X/8X and I2C-bus controlled IC. With combination of
microcontroller and small signal processor, the TDA935X/6X/8X series feature high-integration, high-performance-to-price ratio and high-reliability and advanced functions with fewer external
components, which provide much convenience for manufacturing and technical service.
The super chips TDA935X/6X/8X are good in pins compatibility. Differences among them are shown as follows.
TDA9351（48K） PAL/NTSC/SECAM+1 PAGE TELETEST
TDA9350（48K） PAL/NTSC+1 PAGE TELETEST
TDA9361（64K） PAL/NTSC/SECAM+10 PAGE TELETEST
TDA9360（64K） PAL/NTSC+10 PAGE TELETEST
TDA9380（32K） PAL/NTSC
TDA9387（32K） NTSC

Circuit diagram & PWB