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!

©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 !

Thursday 7 February 2019

HOW TO ENTER SERVICE MODE - ADJUSTMENTS - ZENITH C27A25 – C36A26

How to enter Service Mode - Adjustments - Zenith C27A25 – C36A26

Zenith C27A25, C27A25T6, C32A26, C32A26T6, C36A26, C36A26-8, C36A26T6, C36A26T6-8
FACTORY MENU (Service Mode menu) ADJUSTMENTS
To access the Factory Menu, press and hold the MENU key until the User Menu display disappears, then press 9876, and then ENTER.
The black bar near the top of the screen indicates the part number of the software in the TV set. To the lower right is a number indicating that the module has been tested. The date on the black bar near the bottom left of the screen indicates the date the module went through the factory.
When the Factory Menu appears, it displays the fourth Factory Menu item: VERT POS. Use the SELECT UP/DOWN keys to toggle through all of the adjustments. Uses ADJUST to make a change to the selected item.

00 FACT MENU: Use SELECT UP and DOWN Keys to select item 00, the Factory Mode. The Factory uses this item when the module is being tested. It has two positions: 0 and 1. In the field, this item should always be left off (Zero is off).
When this item is off, only the first seven items in the Factory Menu can be accessed. They appear one at a time near the middle left of the screen. When this item is set to 1, 59 menu items are available.  In the Factory Menu, only the selected menu item is displayed, near the top of the screen, as shown in the figure.
When the Factory Menu is on, the AC Power-On feature is always enabled regardless of the setting of AC ON in the Factory Menu. The TV set will automatically come on when AC is applied.  Use the remote to reenter the Factory Menu to turn the Factory Menu off. Setting the clock or running the Auto Program feature in the customer Set Up menu can also turn off the Factory Mode.
01 PRESET PX: Stores customer menu adjustments in the nonvolatile memory of the EAROM. Selections are Custom and Preset-Store. Settings for Contrast, Brightness, Color and Tint are stored in this manner. 0 is custom and 1 is Preset stored.
02 VERT P0S: Moves On-Screen Displays vertically. The Range is from 0-30. This adjustment is generally set at 15.
03 H0RZ POS: Moves On-Screen Displays horizontally.  Range is from 1-45. Generally set at 20.
04 FEATURE LEVEL: There are three positions: 0,1 and 2.The three positions are used at the factory to program the module for the correct features. In order to change the level, short pins 3 and 4 togather on connector 4G9 on the main module.
NOTE: BE CAREFUL! IF THE WRONG PINS ARE SHORTED, THE MODULE CAN BE DAMAGED.  BE SURE TO REMOVE THE JUMPER AFTER THE LEVEL HAS BEEN SET.
Level 0 is used for private label sets.  Levels 1 and 2 are used for Zenith sets.
05 BAND: There are eight positions.
0 is Broadcast fixed 4 is Broadcast afc.
1 is CATV afc 5 is CATV fixed
2 is HRC afc 6 is HRC fixed
3 is ICC afc 7 is ICC fixed
06 POWER ONLY: There are two positions, 0 is off and 1 is AC on. In position 1 the unit will turn on and off when AC power is applied and removed.
07 RF SUB BRT: (RF brightness) Sets adjustment range of customer control for brightness in RF mode. Range is 0-63. A typical value is 32.
08 AUX SUB BRT: (Auxiliary Brightness) Sets adjustment range of the customer control for brightness in AUX mode. Range is 0-63. Typical value is 32.
09 MAX CONTRAST: Sets adjustment range of customer control for contrast. Range is 0-63. Typical value is 63.
10 VERT SIZE: (Vertical Size) Range is 0-254.
11 HORZ SIZE: (Horizontal Size) Range is 0-254.
12 VERT PHASE: (Vertical Phase) Shifts picture vertically.  Range is 0-7.
13 HORZ PHASE: (Horizontal Phase) Shifts picture horizontally. Range is from 0-30.
14 HORZ AFC: Fast/slow response. Horizontal frequency control. Range is 0-1.
15 BAND PASS: Sets use of ICX2200’s internal band pass chrome filter. Range is 0-1. Set to 1.
16 TRAP 3.58: Zero is off, one is on. Set to 1 for normal TV operation. Set to 0 if Y/C is used or chassis has a comb filter.
17 RED CUT: B&W tracking adjustment. Range is 0 to 254. Typical value is 0.
18 GREEN CUT: B&W tracking adjustment. Range is 0- 254. Typical value is 0.
19 BLUE CUT: B&W tracking adjustment. Range is 0-254. Typical value is 0.
20 GREEN GAIN: B&W tracking adjustment. Range is 0- 255. Typical value is 144.
21 BLUE GAIN: B&W tracking adjustment. Range is 0-254. Typical value is 144.
22 60HZ SW: (60 Hertz Switched) The range is 0 to 2. Set to 2.
23 WHITE COMPRESS: (White Compression) The range is 0 to 1. Set to 1. 0 = Enable and 1 = Disable.
24 6 KEY SYSTEM: Keyboard type. Set to 1 for 6 key and 0 for 10 key.
25 FRONT JACK: 1 = enabled, 0 = disabled
26 XTAL SELECT: Select the xtal oscillator for OSD. Range is 0-1
27 SOUND ATT: Composite audio level adjustment. Range is 0 -63.
28 SOUND ATT2: Composite audio level adjustment for tuner 2. Range is 0 -63.
29 RF AGC: (Rf Automatic Gain Control) Range is from 0-63. 48 is a general setting. Tune in weakest available channel and adjust for a snow- free picture.
30 PIF VCO: Range is 0-127. 70 are typical.
31 AUDIO ATT: Audio Attenuator for main tuner. Range is 0-15. 9 is typical.
32 AUDIO VCO: Audio voltage controlled oscillator. Range is 0 -63. 31 is typical.
33 AUDIO FILTER: (Second Audio Program Voltage-Controlled Oscillator) Stereo, SAP, and dBx filter adjustment. Range is from 0-63.
34 AUDIO SPECTRL: Adjustment of stereo separation (3kHz). Range is 0-63.
35 WIDE BAND: Adjustment of stereo separation (300kHz). Range is 0-63.
36 DELAY PIP SELECT: Delay of output signal. Range is 0 -15. Typical is 15.
37 PIP V LEV: PIP auto gain control. Range is 0 - 15 . Typical is 14.
38 YOFSET: PIP luminance offset. Range is 0 - 3. Typical is 0.
39 PIP PLLITC: PIP PLL synchronization. Range is 0 - 3. Typical is 0.
40 PIP HFP: PIP horizontal fine position. Range is 0 - 31. Typical is 0.
41 PIP INCRA: PIP Regenerated Color Carrier Frequency. Range is 0 - 31. Typical is 15.
42 PIP RED CUTOFF: Adjustment of blanking level. Range  is 0 - 15. Typical is 0.
43 PIP GREEN CUTOFF: Adjustment of blanking level. Range is 0 - 15. Typical is 0.
44 PIP BLUE CUTOFF: Adjustment of blanking level. Range is 0 - 15. Typical is 0.
45 PIP COLOR FRAME: Range is 0 - 63. Typical is 16.
46 PIP FR WID H: PIP Horizontal width of frame. Range is 0 - 7. Typical is 1.
47 PIP FR WID V: PIP Vertical size of frame. Range is 0 - 3. Typical is 0.
48 PIP C KILL: PIP Color Killer threshold. Range is 0 - 3. Typical is 2.
49 PIP Y PEAK: PIP Luminance peaking. Range is 0 - 7. Typical is 4.
50 PIP R GAIN: PIP Red Amplitude. Range is 0 - 254. Typical is 190.
51 PIP G GAIN: PIP Green Amplitude. Range is 0 - 254. Typical is 190.
52 PIP B GAIN: PIP Blue Amplitude. Range is 0 - 254. Typical is 190.
53 PIP COLOR ON: PIP Color on/off. Range is 0 - 1. Typical is 0.
54 PIP FRAME SEL: 3D PIP Frame Selection. Range is 0 - 1. Typical is 1.
55 PIP X1 POSITION: Range is 0 - 127.
56 PIP Y1 POSITION: Range is 0 - 254.
57 PIP X2 POSITION: Range is 0 - 127.
58 PIP Y2 POSITION: Range is 0 - 254.
SMPS SCHEMATIC
HORIZONTAL & VERTICAL SCAN OUT
Click on the pictures to Magnify
Posted By: FRANK at 05:54
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