Alignment CTC197 Service Manual

CTC197

Color Television
Basic Service Data

P.O. Box 1976 / Indianapolis, Indiana 46206

ALIGNMENT PROCEDURES SUBINDEX

Chassis Alignment ................................................................. A4

Color Temperature Adjustment ............................................. A5

Error Codes ............................................................................ A3

Focus Adjustment .................................................................. A5

High Voltage Check .............................................................. A5

Horizontal Phase Adjustment ................................................ A4

Horizontal Raster Adjustments .............................................. A4

Operating Conditions ............................................................. A2

Required Test Equipment ...................................................... A2

Security Codes ....................................................................... A2

Service Menu Parameters ...................................................... A3

Service Mode ......................................................................... A2

Vertical Raster Adjustments .................................................. A4

X-Ray Shutdown Check ........................................................ A2

Technical Publications

CTC197

ALIGNMENT PROCEDURES

Operating Conditions

Unless otherwise noted, the following conditions must be

observed when aligning the CTC197 chassis:

1. Chassis must be operated from a 120VAC isolation
transformer, with line voltage set to 120VAC (±2.0V).

2. Picture controls (brightness, contrast, etc.) must be set to
factory presets via the Picture Quality menu.

3. Procedures must be performed in the sequence given.

4. A 10X probe must be used for oscilloscope and
frequency measurements.

5. Minimum warm-up time is 10 minutes.

Required Test Equipment

- Dual-Trace Oscilloscope

- Digital Voltmeter

- Frequency Counter

- Audio Signal Generator

- NTSC Signal Generator (B&K 1249, or equivalent)

- MTS Signal Generator (B&K 2009, or equivalent)

- Sweep/Marker Generator (or Standard Signal Generator)

- TAG001 Service Generator (stock # 215568)

- DC Power Supply (5.0V/0.25A) for TAG001

- Chipper Check® software

- Chipper Check® interface box and computer

All alignments with the exception of basic color temp and
geometry require the use of Chipper Check® software and
interface box.

A list of the software alignment parameters accessable
using the front panel is shown in Table 1. The remainder of
the alignments require Chipper Check®.

Entering the Service Mode Using the Front Panel Controls

1. Press and release the POWER button to turn the
instrument on.

2. Press and hold the MENU button.

a. Press and release the POWER button.

P: 0 V: 0

b. Press and release the VOL+ button.

3. Release the MENU button.

The instrument will display the following menu:
The CH ∧ and CH ∨ buttons on the front panel (or the

remote transmitter) are used to change the parameter (P)
number. The VOL + and VOL - buttons are used to change the
parameter value (V).

X-Ray Shutdown Check

NOTE: R14911 is factory sealed - do not adjust. Refer to

Replacement Parts for kit information.

The following procedure should be performed prior to, and

upon completion of service:

1. Momentarily apply a short between the shutdown test
point (BC14901- located at back edge of chassis near
main tuner) and chassis ground (main tuner shield). The
instrument must shutdown immediately, then turn back
on after ~ 2 seconds.

2. Apply and maintain a short between the shutdown test
point and chassis ground (tuner shield). The instrument
must shutdown immediately and remain shutdown (the
instrument will attempt to restart several times, then
remain off).

3. Remove the short from BC14901.

4. Enter the Service Mode and reset the error code
parameter(s) to "0".

Service Mode

Most of the alignments for this chassis are software-driven;
adjustments are made by modifying parameter values using
Chipper Check and the service menu. When parameter values
are modified, the corresponding T-chip registers, tuner
registers and EEprom locations are updated.

NOTE: Attempting to change the parameter number (using

CH ∧ or CH ∨) at this point will cause the instrument
to exit the service mode. A valid security code must
be entered (using VOL + or VOL -) before selecting
an alignment parameter.

Security Codes

When the service mode is first turned on, the parameter will
be "0", which does not correspond to an alignment. This is the
security code parameter, the purpose of which is to prevent
accidental entry into the parameter groups. The value for
parameter "0" must be set to 76 for Front panel access or to
200 for Chipper Check®.

Once a security code has been set, pressing CH ∧ or CH ∨
will result in the following display:

P: YY V: ZZZ

Where: YY = parameter number

ZZZ = current value

Page A2

Return to Index

CTC197

ALIGNMENT PROCEDURES (Continued)

At this point, the CH ∧ and CH ∨ buttons can be used to

Parameter Description

change the parameter number and the VOL + and VOL ­buttons can be used to change the value of the parameter
selected.

0 Security Pass
1 Error Code

Error Codes

If certain failures occur in the chassis, error codes will be
stored in the chassis EEprom. These error codes are displayed
in parameters "1", "2" and "3". Parameter "1" stores the error
code for the first failure experienced by the instrument.
Similarly, parameter "2" stores the error code for the second
failure. Parameter "3" is automatically updated to display the
error code for the most recent failure experienced by the
instrument. Error codes are summarized in Table 2.

The presence of a "0" in the error code values indicates that
no failures have occurred since the time when the error code
parameters were reset. These error codes can (and should) be
reset to "0" after servicing with the VOL + and VOL - buttons.

Because a failure of a bus IC is a possible reason for needing
service, normal acknowledgment checking is disabled in the
service mode. If an IIC device has failed, its address will be
stored in the error code area.

Exiting The Service Mode

The service mode can be exited at any time by pressing the
POWER button. No additional steps are required to write new
data into the EEprom(s); new data is entered as parameter

2 Error Code
3 Error Code
4 Horizontal Phase
5 EW DC (Horizontal size)
6 Pincushion Amplitude
7 Pincushion Tilt
8 Pin Top Corner Correction

9 Pin Bottom Corner Correction
10 Vertical Centering
11 Vertical Size
12 Vertical Countdown Mode
13 Red Bias
14 Green Bias
15 Blue Bias
16 Red Drive
17 Green Drive
18 Blue Drive

values are changed.

Table 1 - Service Menu Parameters

Error Code Error Condition Indicated

00 No Error Code Thrown
02 Detected by micro 5.1V_run has fallen below acceptable voltage level
03 Detected by micro 12V_run has fallen below acceptable voltage level
06 Pal/PIP Module Failure to communicate with matrix switch on PAL/PIP Module
08 T4 Chip X-Ray protection was invoked
09 T4 Chip T4 Chip power supply problem at reset
10 PIP Module Error FPIP power supply problem at reset
11 Stereo Decoder Stereo Decoder power supply problem at reset
12 Detected by micro AVR input to micro is held low
16 Detected by micro Run IIC clock or data is clamped at 0 logic state
17 Detected by micro Standby IIC clock or data is clamped at 0 logic state
34 StarSight Failure to receive acknowledgement from StarSight module
44 FPIP Failure to receive acknowledgement from FPIP
56 Digital Convergence Failure to receive acknowledgement from Digital Convergence device

64 Octal DAC Failure to communicate with Octal DAC
128 Stereo Decoder Failure to receive acknowledgement from Stereo Decoder IC
130 Audio Failure to receive acknowledgement from Audio Compressor
134 Video Matrix switch Failure to receive acknowledgement from Video Matrix switch
138 PAL/PIP Module PAL/PIP C1
142 PAL/PIP Module PAL/PIP C2
160 Main or 2nd Tuner EEPROM Failure to receive acknowledgement from EEPROM
186 T4 Chip Failure to communicate with T4 Chip
192 2nd Tuner PLL/DAC Failure to communicate with Tuner PLL IC
194 2nd Tuner PLL/DAC Failure to communicate with Tuner DAC IC
196 Main Tuner PLL/DAC Failure to communicate with Tuner PLL IC
198 Main Tuner PLL/DAC Failure to communicate with Tuner DAC IC

Table 2 - Service Menu Error Codes

Page A3

Return to Index

CTC197

ALIGNMENT PROCEDURES (Continued)

CHASSIS ALIGNMENT

The CTC197 chassis requires the use of ChipperCheck®, a
TV/PC interface box, and a suitable computer (486DX/
33MHz PC with 8Meg memory recommended) for the
majority of the alignments. Basic geometry and color
temperature are the only alignments accessable through the
front panel. These adjustments have been included in this
service manual as front panel procedures but can also be
performed using ChipperCheck®.

ChipperCheck® software and the TV/PC interface box are
available from:

TCE Publications
10003 Bunsen Way
Louisville, KY 40299
Tel. [phone]

Instructions for the operation of ChipperCheck® software
and connection of the TV/PC interface are included as
context-sensitive help files in the ChipperCheck® software.

Horizontal Phase Adjustment

Test Points: TP12704 (Luma) Main PCB

TP14303 (Filament) Main PCB

Adjust: Parameter #4 Range: 0 - 15

Vertical Raster Adjustments

Test Point: Observe Display
Adjust: Parameter #10 Range: 0 - 63

Parameter #11 Range: 0 - 127
Parameter #12 Range: 0 - 3

1. Tune the instrument to receive the crosshatch signal.

2. Preadjust Vertical Size (parameter #11) so that the top
and bottom edges of the display are just visible.

3. Viewing the top and bottom edges of the crosshatch,
adjust Vertical Centering (parameter #10) to center the
display vertically.

4. Adjust Vertical Size (parameter #11) so that ~3.75% of
the crosshatch pattern is hidden at both the top and
bottom of the display (7.5% overscan). Tolerance is
±5%.

Note: Vertical countdown (Parameter 12) must be set

properly:
0 = standard
1 = non-standard
2 = 50Hz
3 = 48Hz

EXAMPLE: If the crosshatch display has fourteen blocks

vertically, adjust so that ~ 1/2 block is hidden at
both the top and bottom of the display.

1. Tune the instrument to receive the color bar signal.

2. Connect the CH1 scope probe (100mV/2µsec/div.) to
TP12704 (pin 38 of U16201); use the tuner shield as
ground reference.

3. Connect the CH2 scope probe (100V/div.) to TP14303
(pin 8 of T14401).

4. Adjust Horizontal Phase (parameter #4) so that the time
delay between the leading edge of horizontal sync (CH1)
and the midpoint of the filament pulse (CH2) is 4.68µsec
(± 0.5µsec), as shown in Figure 1.

| 4.68µsec |

Fig. 1 - Horizontal Phase Adjust

Horizontal Raster Adjustments

Test Point: Observe Display
Adjust: Parameter #5 Range: 0 - 31

Parameter #6 Range: 0 - 15
Parameter #7 Range: 0 - 15
Parameter #8 Range: 0 - 7
Parameter #9 Range: 0 - 7

1. Tune the instrument to receive the crosshatch signal.

2. Preadjust Horizontal Size (parameter #5) so that ~3.75%
of the crosshatch pattern is hidden at both the left and
right of the display (7.5% overscan). Tolerance is ±5%.

EXAMPLE: If the crosshatch display has fourteen blocks

horizontally, adjust so that ~ 1/2 block is hidden
at both the left and right edges of the display.

3. Adjust Pincushion Amplitude (parameter #6) for straight
vertical crosshatch lines at the left and right edges of the
display. Look only at the middle section of these lines at
this time. The top and bottom ends of the lines will be
adjusted in the following steps.

4. Viewing the bottom left and right corners of the display,
adjust Pincushion Bottom Corner (parameter #9) for
straight vertical lines.

5. Viewing the top left and right corners of the display,
adjust Pincushion Top Corner (parameter #8) for straight
vertical lines.

6. Viewing the left and right edges of the display, adjust
Pincushion Tilt (parameter #7) so that the vertical
crosshatch lines are parallel to the sides of the picture
tube mask.

Page A4

Return to Index

CTC197

ALIGNMENT PROCEDURES (Continued)

Focus Adjustment

Test Point: Observe Display
Adjust: Focus Control(s) Main PCB

1. Tune the instrument to receive the crosshatch signal.

2. Adjust the Focus control for best overall focus.

Color Temperature Adjustment

Test Point: Observe Display
Adjust: Parameter #13 (Red Bias) Range: 0 - 127

Parameter #14 (Green Bias) Range: 0 - 127
Parameter #15 (Blue Bias) Range: 0 - 127
Parameter #16 (Red Drive) Range: 0 - 63
Parameter #17 (Green Drive) Range: 0 - 63
Parameter #18 (Blue Drive) Range: 0 - 63

1. From the customer control menu, reset the customer
controls with "Picture Reset".

2. Disconnect all signal sources.

3. Set the Color bias parameter values to 63.

4. Set the Drive parameter values to 32 for 25"/27" non
VHP tubes. Set the Drive parameter values to 40 for 27"
VHP tubes (XXXAEGXXXXX) and all tubes above 27".

5. Enter parameter # 13, 14 or 15 for bias adjustment. Press
Menu button (on instrument front panel) for setup line.
Press the Menu button again to toggle between the setup
line and normal picture.

6. Adjust the screen control to just produce a centerline
(red, green or blue). Do not adjust the bias parameters of
the color displayed in this step for the remainder of the
alignment procedure.

7. Enter parameter #s for the remaining two bias control
colors and adjust them to produce a white setup line.

8. Press Menu button (on instrument front panel) to exit
setup line.

9. Tune the instrument to receive a grey scale signal.

10. Adjust the screen control to produce even steps of the
gray scale. The last gray scale bar must remain black.

11. Enter parameter #s for the color drive controls (16 for
red, 17 for green and 18 for blue). Adjust their respective
parameters to obtain a 6500 degree kelvin color
temperature (warm white) raster.

12. Check the low light to high light gray scale tracking
(black and white picture). Should any color other than
gray or white be dominant in low light to high light areas
the color temperature settings have not been properly set.
Repeat the procedure if necessary.

NOTE: Color bias adjustments affect the low light (dark)

areas while color drive adjustments affect the high
light (white) areas.

13. Press the Power button on the front panel to initiate the
AKB setup and exit the service mode. The screen will
momentarily flash either green or red. If the screen
flashes green the AKB setup is properly set. If the screen
flashes red the AKB could not be properly setup. In many
cases the screen control is set either too high or too low.
Repeat the procedure with a slightly different setting of
the screen control.

High Voltage Check

High voltage for this chassis is not adjustable. To check
high voltage, connect the positive lead of a voltmeter (using a
high voltage probe) to the picture tube anode. Connect the
negative lead to the picture tube ground strap. The meter used
for measuring high voltage must have an impedance of 1000
Mohm or more and be accurate within 5%.

Nominal high voltage (at maximum beam current) for this
chassis is 25.8kV (for 25"/27" instruments), 29.4kV (for 32"/
35" instruments).

Maximum high voltage for this chassis is 29.7kV (for 25"/
27" instruments), 34.0kV (for 32"/35" instruments).

Page A5

Return to Index