Master Electronics Repair !

Welcome to Master Electronics Repair! website.Here you will find:Service Modes, Circuit Diagrams,Service manuals, Firmware Update procedure, Disassemble procedure, Universal remote control setup codes, Troubleshooting, Diagnosing, Measuring, and more.... of many of LCD/LED TV/Displays,others various electronic apparates,trough many technical notes and tips/tricks to help repairing/fixing Troubles/ faults,for electrical technicians.This site helps you to save the Earth from electronic waste!

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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Wednesday 6 March 2019

SHARP DV-620 DVD VIDEO PLAYER TEST MODE - FOCUS ADJUSTMENT - TRACK OFFSET SETTING - POWER SUPPLY CIRCUIT - DVD PLAYER REPAIR AND SERVICE

SHARP DV-620 DVD VIDEO PLAYER Test Mode - Focus adjustment - track offset setting - power supply circuit - DVD player repair and service

Category: DVD Player Repair and Service

Contents of this article

How to access test mode
Power supply circuit diagram

SHARP DV-620

Test Mode

A power source is put, and a playback key and a stop key are pushed after the "NO DISC" display at the same time. (It keeps pushing it for about three seconds.)
ROM Renewal Mode

A power source is put with pushing a playback key and a halt key at the same time. (It keeps pushing it for about three seconds.)

FOCUS offset adjustment mode

Connect the L side of the voltmeter to the IC702 (pin 18) and its H side to the IC702 (pin 17). Adjust the output voltage to a range of -30mV to +10mV with the cross key "UP" or "DOWN". With the cross joint key "<", >, 5 step change

TRACK offset adjustment mode

Connect the L side of the voltmeter to the IC702 (pin 16) and its H side to the IC702 (pin 15). Adjust the output voltage to a range of -30mV to +10mV with the cross key "UP" or "DOWN". With the cross joint key "<", >, 5 step change

End of adjustment

For the section of **, the adjustment results are displayed. The indication contents mean the "focus offset adjustment value", "track offset adjustment value" and "spindle offset adjustment value" from the left. Cut a power source when you finish adjustment. When a "return" key is pushed, it is returned in the beginning of servo adjustment mode.

IC702 BA5984FP MOTOR DRIVER

PIN CONFIGURATION AND FUNCTION

Pin No.	Terminal name	Operation function
1	FWD	Loading driver FWD input terminal
2	OPIN1(+)	CH1 Former stage amplifier nonreverse input terminal
3	OPIN1(-)	CH1 Former stage amplifier reverse input terminal
4	OPOUT1	CH1 Former stage amplifier output terminal
5	OPIN2(+)	CH2 Former stage amplifier nonreverse input terminal
6	OPIN2(-)	CH2 Former stage amplifier reverse input terminal
7	OPOUT2	CH2 Former stage amplifier output terminal
8	VCC	Power terminal
9	VOL(-)	Loading driver Negative output
10	VOL(+)	Loading driver Positive output
11	VO2(-)	Driver CH2 Negative output
12	VO2(+)	Driver CH2 Positive output
13	VO1(-)	Driver CH1 Negative output
14	VO1(+)	Driver CH1 Positive output
15	VO4(+)	Driver CH4 Negative output
16	VO4(-)	Driver CH4 Positive output
17	VO3(-)	Driver CH3 Positive output
18	VO3(+)	Driver CH3 Negative output
19	GND	Ground terminal
20	BIAS	Bias input terminal
21	MUTE	Mute control terminal
22	OPOUT3	CH3 Former stage amplifier output terminal
23	OPIN3(-)	CH3 Former stage amplifier reverse input terminal
24	OPIN3(+)	CH3 Former stage amplifier nonreverse input terminal
25	OPOUT4	CH4 Former stage amplifier output terminal
26	OPIN4(-)	CH4 Former stage amplifier reverse input terminal
27	OPIN4(+)	CH4 Former stage amplifier nonreverse input terminal
28	REV	Loading driver REV input terminal

EQUIVALENT CIRCUIT OF PICKUP

TROUBLE SHOOTING

SYMPTOM: No sound on initial playback when using "Andrew Lloyd Webber's The Phantom of the Opera (2004)" disc.
CAUSE: The disc defaults to DTS sound, but DVD player may not be able to decode this and needs to be switched into the normal sound mode mode.
ACTION: Enter the DVD player menu and select the correct sound output.

POWER SUPPLY CIRCUIT

CLICK ON THE IMAGE TO ZOOM IN