REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Thursday 28 February 2019

SONY CDX GT41US - FM/AM COMPACT DISC PLAYER – SCHEMATIC (CIRCUIT DIAGRAM)

Sony CDX GT41US - FM/AM COMPACT DISC PLAYER – Schematic (Circuit Diagram)

FM-AM COMPACT DISC PLAYER Sony CDX-GT41UW - GT410U - GT460U - GT460US – Schematic – Wiring diagram. Used ICs: TDA8588AJ/N2/R1 – BA8271F-E2 – BD3442FS-E2 – BD9778HFP – NJM2387ADL3 – M880F46PF-0-101E1
Power amplifier section
Outputs Speaker outputs (sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output - 52 W × 4 (at 4 ohms)
FM Tuning range GT41UW/GT410U
87.5 – 107.9 MHz
GT460U/GT460US
87.5 – 108.0 MHz (at 50 kHz step)
87.5 – 107.9 MHz (at 200 kHz step)
FM tuning interval GT460U/GT460US:
50 kHz/200 kHz switchable.
AM Tuning range GT41UW/GT410U
530 – 1,710 kHz
GT460U/GT460US
531 – 1,602 kHz (at 9 kHz step)
530 – 1,710 kHz (at 10 kHz step)
AM tuning interval GT460U/GT460US
9 kHz/10 kHz switchable.
AUDIO POWER SPECIFICATIONS (US MODEL)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
23.2 watts per channel minimum continuous average power into 4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more than 5% total harmonic distortion.
CD Drive Mechanism Type MG-101U-188//Q
Optical Pick-up Name DAX-25A
NOTE FOR REPLACEMENT OF THE SERVO BOARD
When repairing, the complete SERVO board (A-1206-357-A) should be replaced since any parts in the SERVO board cannot be repaired
Click on the pictures to zoom in
Circuit Diagram (Schematic)
Connection diagram
1 To a metal surface of the car First connect the black ground (earth) lead, then connect the yellow and red power supply leads.
2 To the power antenna (aerial) control lead or power supply lead of antenna (aerial) booster
Notes
• It is not necessary to connect this lead if there is no power antenna (aerial) or antenna (aerial) booster, or with a manually-operated telescopic antenna (aerial).  • When your car has a built-in FM/AM antenna (aerial) in the rear/side glass, see “Notes on the control and power supply leads.”
3 To AMP REMOTE IN of an optional power amplifier
This connection is only for amplifiers. Connecting any other system may damage the unit.
4 To the +12 V power terminal which is energized in the accessory position of the ignition switch.
Notes
• If there is no accessory position, connect to the +12 V power (battery) terminal which is energized at all times.  Be sure to connect the black ground (earth) lead to a metal surface of the car first.
• When your car has a built-in FM/AM antenna (aerial) in the rear/side glass, see “Notes on the control and power supply leads.”
5 To the +12 V power terminal which is energized at all times.  Be sure to connect the black ground (earth) lead to a metal surface of the car first.
Notes on the control and power supply leads
• The power antenna (aerial) control lead (blue) supplies +12 V DC when you turn on the tuner.
• When your car has built-in FM/AM antenna (aerial) in the rear/side glass, connect the power antenna (aerial) control lead (blue) or the accessory power supply lead (red) to the power terminal of the existing antenna (aerial) booster.
• A power antenna (aerial) without a relay box cannot be used with this unit.
Memory hold connection
When the yellow power supply lead is connected, power will always be supplied to the memory circuit even when the ignition switch is turned off.
Notes on speaker connection
• Before connecting the speakers, turn the unit off.
• Use speakers with an impedance of 4 to 8 ohms, and with adequate power handling capacities to avoid its damage.
• Do not connect the speaker terminals to the car chassis, or connect the terminals of the right speakers with those of the left speaker.
• Do not connect the ground (earth) lead of this unit to the negative (–) terminal of the speaker.
• Do not attempt to connect the speakers in parallel.
• Connect only passive speakers. Connecting active speakers (with built-in amplifiers) to the speaker terminals may damage the unit.
• To avoid a malfunction, do not use the built-in speaker leads installed in your car if the unit shares a common negative (–) lead for the right and left speakers.
• Do not connect the unit’s speaker leads to each other.
Note on connection
If speaker and amplifier are not connected correctly, “FAILURE” appears in the display. In this case, make sure the speaker and amplifier are connected correctly.
Posted By: FRANK at 06:17
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