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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Monday 25 March 2019

SANYO CP29AF2X - SERVICE MODE AND ADJUSTMENTS - AUSTRALIA & NEW ZEALAND MODELS

SANYO CP29AF2X - SERVICE MODE AND ADJUSTMENTS - AUSTRALIA & NEW ZEALAND MODELS




PROTECTION CIRCUIT
  • This TV set has a built-in power supply protection circuit.
  • It is provided to protect the TV set in case of a power supply circuit malfunctions. When something abnormality occurs during TV reception, the TV set goes to the stand-by mode.
  • When an abnormality occurs during TV reception, it causes pin 27 of the CPU to go continually Low (less than 0.75V) for about one second. The CPU detects that this has occurred and outputs the signal from pin 31 to switch off the power supply lines.
RELEASING THE PROTECTIVE CIRCUIT & RESTORING POWER SUPPLY.
  • To release the protective circuit and restore power supply, turn the power to the TV set OFF and then ON again via either the main power switch or the ON-OFF button on the remote control. This will work only if the power supply trouble was temporary. If there is permanent trouble such as a damaged circuit, power cannot be restored and the circuit will have to be repaired.
SERVICE ADJUSTMENTS AFTER REPLACING THE MEMORY IC [IC802]
The CPU (IC801) and memory IC (IC802) store the service adjustments data and controls data for each circuit. When the Memory IC(IC802) is replaced, some of the service adjustments should be readjusted to obtain the best performance. The necessary service adjustments are carried out by using the RC handset.  Set up the TV set with following steps.
  1. Put a new memory IC.
  2. Turn on the TV set.
  3. Press and hold the TV/AV Selector on the TV set for more than 2 seconds. The following picture appears on the screen.
  4. Press the PROGRAMME UP on the TV set while the above On-Screen Display is still on the screen.  This completes the initialization of memory IC
Following shows the initialized contents of memory data by this procedure.
Plug & play : No executed
Inhibit data : Cancelled
Ch skip data : Cancelled
Sound volume data : 10/63 steps.
Volume Lock : OFF
Tuning Lock : OFF
Colour system : AUTO
  • Readjust the following service adjustments.
RF AGC Item 01, RF AGC
Horizontal centre Item 02, H-PHA
Vertical size Item 04, V-SIZ
Vertical-S correction Item 05, V-SCO
Vertical linearity Item 06, V-LIN
Gray scale Item 14-17, 19-21
ENTERING INTO SERVICE MODE
  1. Press and hold the MENU button on the Remote Control and press the VOLUME (+) button on the TV set.
  2. Select item by pressing the TIMER (Item No. UP) or SOUND MUTE (Item No. DOWN) button on the remote control handset.
  3. Adjust data value by pressing the VOLUME + or VOLUME - button on the remote control handset.
  4. To return to normal TV mode, press the MENU button on the TV set or the remote control handset.
RF-AGC ADJUSTMENT
Do not attempt this adjustment with weak signal.
  1. Tune the receiver to most clearest (or strongest) VHF station in your area. Set the brightness and contrast controls to maximum. Set the color control to minimum.
  2. Select [RF AGC] in the service mode.
  3. Change value until the snow noise just disappears.
  4. Exit from service mode.
GRAY-SCALE ADJUSTMENT
  1. Receive the monochrome circular pattern.
  2. Set the brightness and colour to normal, contrast to maximum.
  3. Enter to the service mode.
  4. Set each value of Item-14 RBIAS, 15 GBIAS, 16 BBIAS, 17 RDRIV and 19 BDRIV mode to 64.
  5. Select Item-20 mode to be one horizontal scanning line and turn the screen volume on the FBT to obtain just visible one colored line.
  6. Press the 1 (Red Bias -), 2 (Red Bias +), 5 (Green Bias -), 6 (Green Bias +), 9 (Blue Bias -) or 0 (Blue Bias +) button to adjust the brightness of each color until a dim white line produced. Please see the control button allocations in this mode.
  7. Select Item-21 DRV mode to enter the white balance adjusting mode.
  8. Press the 3 (Red Drive -), 4 (Red Drive +), -/-- (Blue Drive -) or RECALL (Blue Drive +) button alternately to produce normal black and white picture.
  9. Exit from the service mode.
  10. Check for proper grey scale tracking at all brightness levels.
  11. If the grey scale adjustment is made after picture tube replacement, check the high voltage.
HIGH-VOLTAGE CHECK
+B (+140V) Voltage Check and Grayscale Adjustment must be completed before attempting High Voltage Check.
  1. Connect high voltage voltmeter negative lead to ground, and connect + lead to anode of picture tube.
  2. Tune receiver to an active channel and confirm TV is operating properly.
  3. Maximize the beam current by adjusting the contrast and brightness controls to maximum. Confirm high voltage is within 28 KV and 30 KV at maximum beam current.
  4. Eliminate the beam current by adjusting the contrast and brightness controls to minimum. Confirm high voltage does not exceed 32 KV at zero beam current.
  5. If reading is not within range, check horizontal circuit.  No high-voltage adjustment is provided on this chassis.
+B VOLTAGE CHECKING
  • Connect a DC meter to TP-B and the ground.
  • Tune the receiver to an active channel and synchronized picture. Select NATURAL picture mode by pressing the PICTURE MODE button on the remote control.
  • Adjust B-voltage to become 140 ± 1V DC by using VR651.
SPECIAL FUNCTIONS
  1. Volume Lock setting:  With this function, a maximum sound volume limit can be set at any level.
  2. Tuning Lock setting:  Once TUNING LOCK is switched on, further channel tuning (Pre-set) is not possible. The Channel Swapping function also is not possible.
  3. Music Mode setting:  When Music Mode is ON, Programme position from “91” to “99” and “0” are set Music Mode. Only sound is provided and any picture is not on the screen under Music Mode.
  4. AV Start setting:  Set AV-START to ON and every time the TV set is switched on, AV1 position will be the initial program position.
  5. Language selection for the on screen display:  Either Thai or English can be selected as the language of the screen display.
 How to set the special function: 
When making the VOLUME LOCK setting, set the desired maximum sound volume by pressing the VOLUME + or - button before entering Special Function setting mode.
  • To enter into the special function setting mode, press and hold the MENU button of the remote control, then press the PROGRAMME DOWN button on the TV set.
  • Select an item of the special functions by pressing the PROGRAMME UP or DOWN button on the remote control or the TV set.
  • Set the selected special function “ ON “ by pressing the VOLUME + or - button. To cancel, set to “ OFF”.
Posted By: FRANK at 01:58
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