1-8-1
TD900EA
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note:
"CBA" is abbreviation for "Circuit Board
Assembly."
NOTE:
Electrical adjustments are required after replacing
circuit components and certain mechanical parts.
It is important to perform these adjustments only
after all repairs and replacements have been com-
pleted.
Also, do not attempt these adjustments unless the
proper equipment is available.
Test Equipment Required
1. NTSC Pattern Generator (Color Bar W/White Win-
dow, Red Color, Dot Pattern, Gray Scale, Mono-
scope, Multi-Burst)
2. AC Milli Voltmeter (RMS)
3. Alignment Tape (FL8A, FL8N), Blank Tape
4. DC Voltmeter
5. Oscilloscope: Dual-trace with 10:1 probe,
V-Range: 0.001~50V/Div,
F-Range: DC~AC-60MHz
6. Frequency Counter
7. Plastic Tip Driver
How to make service remote control
unit:
1. Prepare normal remote control unit (Part No.
NE200UD). Remove 4 screws from the back lid
(Fig. 1-1).
2. Cut off pin 10 of the remote control microprocessor
and short circuit pins 10 and 17 of the microproces-
sor with a jumper wire
How to Set up the Service mode:
Service Mode:
1. Use the service remote control unit.
2. Turn the power on. (Use main power on the TV
unit.)
3. To enter the TV mode, press CH UP or CH DOWN
button on the TV unit.
4. Press "DISC MENU" button on the service remote
control unit. (Version of micro computer will display
on the CRT. (Ex: 057-001)
X-Ray Protection Test
X-Ray protection test should be done when replacing
any parts of this chassis.
1. Short test points J520 and J522 (on H.V. CBA).
2. Confirm that the main power turns off.
3. If the main power does not turn off, then replace
the following parts (D591, Q591, R592, R593,
R594 and IC1201).
4. Perform steps 1 to 3 again.
1. DC 114V (+B) Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
unit does not operate correctly.
Note: J521(+B), J535(GND) --- H.V. CBA,
VR2601 --- Power Supply/AV CBA
1. Connect the unit to AC Power Outlet.
2. Connect DC Volt Meter to J521(+B) and
J535(GND).
3. Adjust VR2601 so that the voltage of J521(+B)
b114
±
0.5V DC.
SCREW
Fig. 1-1
Remote control unit (Bottom)
Test point
Adj. Point
Mode
Input
J521
(+B)
J535
(GND)
VR2601
---
-----
Tape
M. EQ.
Spec.
---
DC Voltmeter
+114
±
0.5V DC
Содержание EC720E
Страница 2: ...EC720E T1008UJ 2004 06 22 ...
Страница 22: ...1 7 4 TD900DC S 4 S 4 S 4 S 4 4 CRT Anode Cap CRT CBA Fig 3 ...
Страница 62: ...WF11 PIN 5 OF CN571 Q571 Collector WF10 H V CBA Bottom View TV VCR Section 1 11 39 1 11 40 BTD930F01031 A ...
Страница 64: ...1 11 43 BTD850F01022B 1 11 44 Function CBA Top View TV VCR Section Function CBA Bottom View TV VCR Section ...
Страница 93: ...2 4 8 TD951DA Fig DM16 41 42 43 L 13 44 45 P 9 Slide Fig DM17 ...
Страница 97: ...3 1 3 TD900PEX S4 S1 X1 TAPE X5 X4 X2 X3 S3 S6 S7 S2 PACKING TAPE Packing ...
Страница 119: ...Printed in Japan 2003 08 25 HO 6720FDD TD900UA ...