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.

How to use the site:

- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday 5 March 2019

SONY HCD-ZX66I - ZX99I - COMPONENT HI-FI STEREO SYSTEM – TEST MODE – COLD RESET - CD SERVICE MODE – AUDIO AMPLIFIER SCHEMATIC DIAGRAM - STK412-240M-E - STK412-150C - AUDIO SYSTEM REPAIR AND SERVICE

SONY HCD-ZX66i - ZX99i - COMPONENT Hi-Fi STEREO SYSTEM – Test mode – Cold reset - cd service mode – Audio amplifier schematic diagram - STK412-240M-E - STK412-150C - Audio system repair and service

Category: Audio system Repair and Service

Contents of this article

CD Service mode access
Cold reset procedure
Power amplifier circuit

SONY HCD-ZX66i - ZX99i

TEST MODE

GC TEST MODE
# This mode is used to check the fluorescent indicator tube, LEDs, keys, JOG, VOLUME jog, model, destination and software version.
Procedure:
1. Press [FORWARD ] (iPod) button, [TUNING MODE] button and [DISC 2] button simultaneously.
2. All segments in fluorescent indicator tube and the LEDs are lighted up.
3. When you want to enter to the model version and destination display mode, press [DISC 1] button. The model information appears on the fluorescent indicator tube.
4. Each time [DISC 1] button is pressed, the display changes to display software version of the software creation. The sequence is MC, GC, SYS, CD, CDDM, CDMA, CDMB, BDA, BDB, ST, TA, TM, and iPod in this order, and returns to the MC version display.
5. When [DISC 3] button is pressed while the software version is being displayed, the date of the software creation appears. When [DISC 3] button is pressed again, the display returns to the software version display. When [DISC 1] button is pressed while the date of the software creation is being displayed, the date of the software creation is displayed in the same order of software version display.
6. Press [DISC 2] button, the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays “K 0 J0 V0”.
Turn the [JOG] clockwise; “J” value increases by one. Turn the [JOG] counterclockwise; “J” value decreases by one. Each time a button is pressed, “K” value increases. Press their keys on main unit to check whether the key is detected. However, once a button has been pressed, it is no longer taken into account. “V” value increases in the manner of 0, 1, 2, 3 ... if [VOLUME] knob is turned clockwise, or it decreases in the manner of 0, 9, 8, 7 ... if [VOLUME] knob is turned counterclockwise.
8. When [EX-CHANGE] button is pressed after all segments in fluorescent indicator tube and the LEDs light up, alternate segments in fluorescent indicator tube would light up. If you press [EX-CHANGE] button again, another half of alternate segments in fluorescent indicator tube would light up. Press [EX-CHANGE] button again would cause all segments lights up.
9. To release from this mode, press three buttons in the same manner as step 1, or disconnect the power cord.

MC TEST MODE
# This mode is used to check operations of the respective sections of Amplifier and Tuner.
Procedure:
# To enter MC Test Mode
1. Press [FORWARD ] (iPod) button, [TUNING MODE] button and [DISC 3] button simultaneously.
2. The CD ring indicators and speaker indicators flash on the fluorescent indicator tube. The function is changed to PHONO.
# Check of Amplifier
1. Press [UP] button and a message “GEQ MAX” appears on the fluorescent indicator tube. GEQ increases to its maximum.
2. Press [DOWN] button and a message “GEQ MIN” appears on the fluorescent indicator tube. GEQ decreases to its minimum.
3. Press either [LEFT] button or [RIGHT] button and a message “GEQ FLAT” appears on the fluorescent indicator tube. GEQ is set to flat.

4. When the [VOLUME] knob is turned clockwise even slightly, the sound volume increases to its maximum and a message “VOLUME MAX” appears on the fluorescent indicator tube.
5. When the [VOLUME] knob is turned counterclockwise even slightly, the sound volume decreases to its minimum and a message “VOLUME MIN” appears on the fluorescent indicator tube.
# To release from MC Test mode
1. To release from this mode, press [POWER] button.
2. The cold reset is enforced at the same time.
COLD RESET
# The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the customer.
Procedure:
1. Press [FOWARD] (iPod) button, [TUNING MODE] button, and [POWER] button simultaneously.
2. The fluorescent indicator tube becomes blank for a while, and the set is reset.

VACS ON/OFF
# This mode is used to switch ON and OFF the VACS (Variable Attenuation Control System).
Procedure:
1. Press [POWER] button to turn the set ON.
2. Press [AMP MENU] button and [POWER] button simultaneously. The message “VACS OFF” or “VACS ON” appears on the fluorescent indicator tube.

TUNER STEP CHANGE
# The step interval of AM channels can be toggled between 9 kHz and 10 kHz.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Press [TUNER/BAND] button to select the “AM”.
3. Press [POWER] button to turn the set OFF.
4. Press [TUNING MODE] button and [POWER] button simultaneously. The system will turn ON automatically. The message “AM 9k STEP” or “AM 10k STEP” appears on the fluorescent indicator tube and thus the channel step is changed.
CD SERVICE MODE
# This mode let you move the CD sled motor freely. Use this mode when you want to clean the optical pick-up.

Procedure:
1. Press [POWER] button to turn the set ON.
2. Select CD function.
3. Press [FORWARD] (iPod) button, [TUNING MODE] button, and [DISC 5] button simultaneously.
4. The CD service mode is activated. The message “SERVICE MODE” appears on the fluorescent indicator tube.
5. With the CD in stop status, press [FOWARD] (CD) to move the optical pick-up to outside track, or turn [REWIND] (CD) to move to inside track. The message “SLED OUT” or “SLED IN” appears on the fluorescent indicator tube.
6. To turn on or off the laser, press [PLAY MODE] button. The message “LD ON” or “LD OFF” appears on the fluorescent indicator tube.
7. To release from this mode, press [POWER] button.

CD AGING MODE
# This mode can be used for operation check of CD section. If an error occurs, the aging operation would stops and the status is displayed. If there were no error occurs, the aging operation would continue repeatedly.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Select CD function.
3. Load 5 discs on the disc tray.
4. Press [PLAY MODE] button repeatedly to select the “ALL DISCS” mode, and press the [REPEAT] button on the remote repeatedly to select repeat mode off.
5. Press [M] (iPod) button, [TUNING MODE] button and [DISC 4] button simultaneously.
6. Aging operation is started.
7. To release from this mode, press [POWER] button or disconnect the power cord to turn the power OFF.

CD REPEAT 5 LIMIT OFF MODE
# The number of repeat for CD playback is 5 times when the repeat mode is “REPEAT ALL”. This mode enables CD to repeat playback for limitless times.
Procedure:
1. Press [POWER ] button to turn the set ON.
2. Select CD function.
3. Press [FORWARD ] (iPod) button, [TUNING MODE] button and [EX-CHANGE] button simultaneously to enter the CD repeat
5 limit off mode and the fluorescent indicator tube displays “LIMIT OFF”.
4. To release from this mode, operate the cold reset. (Refer to the “MC COLD RESET”)
CD SHIP MODE (WITH MEMORY CLEAR)
# This mode moves the optical pick-up to the position durable to vibration and clears all data including preset data stored in the RAM to initial conditions. Use this mode when returning the set to the customer after repair.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Select CD function.
3. Press [EX-CHANGE] button and [POWER] button simultaneously. The set will power off automatically.
4. After the “STANDBY” blinking display finishes, a message “MECHA LOCK” is displayed on the fluorescent indicator. tube and the CD ship mode is set.
5. Then AC power OFF.
CD SHIP MODE (WITHOUT MEMORY CLEAR)
# This mode moves the optical pick-up to the position durable to vibration. Use this mode when returning the set to the customer after repair.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Select CD function.
3. Press [DISC SKIP] button and [POWER] button simultaneously. The set will power off automatically.
4. After the “STANDBY” blinking display finishes, a message “MECHA LOCK” is displayed on the fluorescent indicator tube and the CD ship mode is set.
5. The AC power OFF.

CD POWER MANAGE
# This mode let you switch on or off power supply to the BU during TUNER function.
# When CD POWER is set to OFF, the power supply to the BU is cut off during TUNER function. It will increase the time taken to access CD when function change from TUNER to CD but it will improve tuner reception.
# When CD POWER is set to ON, the power supply to the BU is not cut off during TUNER function. It will reduce the time taken to access CD when function change from TUNER to CD but it will decrease tuner reception performance.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Select CD function.
3. Press [POWER] button to turn the set OFF.
4. When demonstration appear, press [STOP] (CD) button and [POWER] button simultaneously. The set will power on automatically.
5. The message “CD POWER ON” or “CD POWER OFF” will be displayed on the fluorescent indicator tube.

CD TRAY LOCK MODE
# This mode let you lock the disc tray. When this mode is activated, the disc tray will not open when [OPEN/CLOSE] button or [EX-CHANGE] button is pressed. The message “LOCKED” will be displayed on the fluorescent indicator tube.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Select CD function.
3. Press and hold [STOP] (CD) button and [Z OPEN/CLOSE] button simultaneously until “LOCKED” or “UNLOCKED” displayed on the fluorescent indicator tube (around 5 seconds).
VACS DISPLAY
# This mode is used to check the VACS level.
Procedure:
1. Press [POWER] button to turn on the system.
2. Press [FORWARD] (iPod) button, [TUNER MEMORY] button and [DISC 3] button simultaneously.
3. During the VACS Level Display Mode, the fluorescent indicator tube displays “VACSx APy”. “x” represent VACS level which is triggered by signal level, and “y” represent APVACS (Abuse Protection VACS) level which is triggered.

AUDIO AMPLIFIER SCHEMATIC DIAGRAM

USING IC STK412-240M-E - STK412-150C

CLICK ON THE IMAGE TO ZOOM IN