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 beinadvertently 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 maycause 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 startingalignment. 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.
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 bewithin 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 centerwhen you apply a signal of 91 kHz/85 Hz.
PG17H* G2 PG19S* PG19R* G2
SDD 525V MEC 560V
TOSHIBA 635V SDD 530V
4 Alignment and Adjustments 4-1-1 (i) BRIGHTNESS AND CONTRAST Unless otherwise specified, adjust control volumes: Brightness: Maximum Contrast: Maximum Note: The signal cable connector which includes the 3-wire cable must connect to the monitor. Ifyou use Setup 2 (PC only, no signal generator) you can only make adjustments to the signal timing available on that computer system. To make corrections to all factory timings requires the use of an additional signal generator.
MONITOR INTERFACE BOARD VER. 2.0 5V DC ADAPTOR PARALLEL CABLE PC SIGNAL GENERATOR SIGNAL CABLE
4-1-2 Required Equipment
The following equipment may be necessary foradjustment procedures: 4-1-2 (a) DISPLAY CONTROL ADJUSTMENT 1. Non-metallic (Ð) screwdriver: 1.5 mm Non-metallic (Ð) screwdriver: 3 mm 2. Philips (+) screwdriver: 1.5 mm 3. Non-metallic hexkey: 2.5 mm 4. Digital Multimeter (DMM), or Digital Voltmeter (DVM) 5. Signal generator, or Computer with a video board that uses the ET-4000 chipset (strongly recommended if using Samsung DM 200 software) andthat displays: 1280 x 1024 @ 85 Hz, or 1600 x 1200 @ 85 Hz (maximum). 6. Personal computer 7. Required software: Softjig.exe from Samsung which includes the SF9839TE.MDL (Toshiba CRT) data file Samsung DM200, or DisplayMate for Windows from Sonera Technologies 8. Interface Board Ver. 2.0 Code No. BH81-90001K 9. Parallel communications cable (25-pin to 25-pin); Code No. BH81-90001H 10. Signal cable...