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4 Alignment and Adjustments
This section of the service manual explains how to make permanent adjustments to the monitor. Direction
is given for adjustment using the monitor Interface Board Ver. 2.0 and software (Softjig).
4-1 Adjustment Conditions
Caution: Changes made without the Softjig are saved only to the user mode settings. As such, the
settings are not permanently stored and may be inadvertently deleted by the user.
4-1-1 Before Making Adjustments
4-1-1 (a) ORIENTATION
When servicing, always face the monitor to the
east.
4-1-1 (b) MAGNETIC FIELDS
Whenever possible, use magnetic field isolation
equipment such as a Helmholtz field to surround
the monitor. If a Helmholtz field is not available,
frequently degauss the unit under test.
Caution: Other electrical equipment may cause
external magnetic fields which may
interfere with monitor performance.
Use an external degaussing coil to limit magnetic
build up on the monitor. If an external degaussing
coil is not available, use the internal degaussing
circuit. However, do not use the internal
degaussing circuit more than once per 30 minutes.
4-1-1 (c) WARM-UP TIME
The monitor must be on for 30 minutes before
starting alignment. Warm-up time is especially
critical in color temperature and white balance
adjustments.
4-1-1 (d) SIGNAL
Analog, 0.7 Vp-p positive at 75 ohm, internal
termination
Sync: Separate/Composite
(TTL level negative/positive)
Sync-on-Green:
Composite sync 0.3 Vp-p negative
(Video 0.7 Vp-p positive)
4-1-1 (e) SCANNING FREQUENCY
Horizontal: 30 kHz to 115 kHz (Automatic)
Vertical:
50 Hz to 160 Hz (Automatic)
Unless otherwise specified, adjust at the
1024 x 768 mode (H: 68 kHz, V: 85 Hz) signals.
Refer to Table 2-1 on pages 2-2 and 2-3.
PG17**/PG19**/PG21**
4-1-1 (f) HIGH VOLTAGE ADJUSTMENT
Signal:
1024 x 768 mode (68 kHz/85 Hz)
Display image: Full white
Contrast:
Maximum
Brightness:
Maximum
Limit:
27.3 kV ± 0.5 kV
(17Ó: 26 kV ± 0.5 kV)
Measure the hight voltage level at the anode cap.
High voltage should be within the limit as above.
If the high voltage needs adjustment use the
Softjig.
4-1-1 (g) G2 (SCREEN) VOLTAGE ADJUSTMENT
Signal:
1024 x 768 mode (68 kHz/85 Hz)
Display image: Full white
Contrast:
Maximum
Brightness:
Maximum
Adjust the Screen VR of the FBT so that the G2
(Screen) Voltage for Toshiba it is 540 V ± 10 V.
4-1-1 (h) CENTER RASTER
Adjust VR401 so that the back raster comes to the
center when you apply a signal of 91 kHz/85 Hz.
PG17H*
G2
PG19S*
PG19R*
G2
SDD
TOSHIBA
525V
635V
MEC
SDD
560V
530V
4-1
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