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

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