Maintenance
4–4
TSG 90 PATHFINDER Service Manual
Diagnostics
The PATHFINDER contains no automated diagnostic routines. There is one
diagnostic selection found in the diagnostics menu: LCD Diag. This menu is ac-
cessed by holding the LOCKOUT button down while turning the PATHFINDER
ON.
AUTO POWER DOWN
Use the
A
and
"
keys to enable/disable the Auto
Power Down function. When enabled, the PATH-
FINDER will power down after 10 minutes of inac-
tivity (no keystrokes). Enabled status is indicated by
a rotating line in the upper-right corner of the LCD
display.
BATTERY TYPE
Use the
A
and
"
keys to select between RE-
CHARGEABLE and DISPOSABLE battery types.
This selection sets the voltage at which the BAT-
TERY LOW message appears and the lowest volt-
age on which the instrument will operate. Be sure to
set this selection to RECHARGEABLE when using
NiCad batteries, and DISPOSABLE when alkaline
batteries are installed.
FACTORY RESET
Pressing the ENTER button when this selection is
displayed will reset the PATHFINDER to the facto-
ry default settings. This includes stored text and
user presets.
CAUTION: ALL USER-MADE SELECTIONS AND
PRESETS WILL BE LOST.
LCD DIAG
This selection is used to check the proper operation
of the LCD display. Pressing the
A
button will turn
all the LCD segments on, and pressing the
"
button
will turn all the segments off.
TONE LVL0
This selection is used to calibrate the PATHFIND-
ER 0 dBu tone level. The setting requires adjusting
an internal potentiometer. See the adjustment proce-
dure in Section 3 for instructions.
TONE LVL4
This selection is used to calibrate the PATHFIND-
ER + 4 dBu tone level. See the adjustment proce-
dure in Section 3.
TONE LVL8
This selection is used to calibrate the PATHFIND-
ER + 8 dBu tone level. See the adjustment proce-
dure in Section 3.
Diagnostic Menu
Содержание TSG 90 PATHFINDER
Страница 4: ...ii TSG 90 PATHFINDER Service Manual...
Страница 10: ...viii TSG 90 PATHFINDER Service Manual...
Страница 11: ...Specifications...
Страница 12: ......
Страница 22: ...Specifications 1 10 TSG 90 PATHFINDER Service Manual Figure 1 2 75 Color Bars Figure 1 3 Red Field...
Страница 23: ...Specifications TSG 90 PATHFINDER Service Manual 1 11 Figure 1 4 SIN X X Figure 1 5 5 Step Staircase Gray Scale...
Страница 24: ...Specifications 1 12 TSG 90 PATHFINDER Service Manual Figure 1 6 0 IRE Flat Field Figure 1 7 50 IRE Flat Field...
Страница 25: ...Specifications TSG 90 PATHFINDER Service Manual 1 13 Figure 1 8 Black Burst Figure 1 9 Field Square Wave...
Страница 26: ...Specifications 1 14 TSG 90 PATHFINDER Service Manual Figure 1 10 Multiburst Figure 1 11 Convergence Components...
Страница 27: ...Specifications TSG 90 PATHFINDER Service Manual 1 15 Figure 1 12 NTC7 Composite Figure 1 13 NTC7 Combination...
Страница 28: ...Specifications 1 16 TSG 90 PATHFINDER Service Manual Figure 1 14 FCC Composite Figure 1 15 Matrix...
Страница 29: ...Specifications TSG 90 PATHFINDER Service Manual 1 17 Figure 1 16 Safe Area...
Страница 30: ...1 18 TSG 90 PATHFINDER Service Manual...
Страница 31: ...Operating Information...
Страница 32: ......
Страница 38: ...Operating Information 2 6 TSG 90 PATHFINDER Service Manual...
Страница 39: ...Performance Verification and Adjustment Procedures...
Страница 40: ......
Страница 53: ...Maintenance...
Страница 54: ......
Страница 62: ...4 8 TSG 90 PATHFINDER Service Manual...
Страница 63: ...Replaceable Electrical Parts...
Страница 64: ......
Страница 75: ...Diagrams Circuit Board Illustrations...
Страница 76: ......
Страница 79: ...Diagrams Circuit Board Illustrations TSG 90 6 3 TSG 90 Block Diagram...
Страница 81: ...0 0 0 0 0 0 0 0 0 0 4 2 4 2 0 0 0 0 0 2 3 0 1 0 TSG 90 KEY BOARD 1 2 A2...
Страница 83: ...TSG 90 CPU CLOCK TIMING DIGITAL AND ID GENERATION 1 A1...
Страница 86: ......
Страница 87: ...Replaceable Mechanical Parts...
Страница 88: ......
Страница 93: ...TSG 90 PATHFINDER Service Manual 7 5 A1 A2 FIG 1 EXPLODED VIEW A3...
Страница 94: ...TSG 90 PATHFINDER Service Manual 7 6...