1-6-1
T7500EA
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note:
"CBA" is abbreviation for "Circuit Board
Assembly."
NOTE:
Electrical adjustments are required after replacing cir-
cuit components and certain mechanical parts.
It is important to perform these adjustments only after
all repairs and replacements have been completed.
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 remote control unit. (Part No. N0107UD or
N0150UD) Remove 3 screws from the back lid.
(Fig. 1-1)
2. Remote control unit: Part No. N0107UD
Add J1 (Jumper Wire) to the remote control CBA.
(Fig. 1-2)
Remote control unit: Part No. N0150UD
Cut off pin 10 of the remote control microprocessor
and short circuit pins 10 and 17 of the microproces-
sor with a jumper wire.
Note:
The remote control with the unit cannot be used
as service remote control unit.
How to Set up the Service mode:
Service mode:
1. Use the service remote control unit.
2. Turn the power on.
3. Press "WAKE-UP/SLEEP" button on the service
remote control unit.
1. DC 114V (+B) Adjustment
Purpose:
To obtain correct operation.
Symptom of Misadjustment:
The picture is dark and
unit does not operate correctly.
Note:
D613 Cathode (+B), C613(-) (GND),
VR601 --- Main CBA
1. Connect the unit to AC Power Outlet.
2. Connect DC Volt Meter to D613 Cathode (+B) and
C613(-) (GND).
3. Adjust VR601 so that the voltage of D613 Cathode
(+B) b114
±
0.5V DC.
2. Initial Setting
General
1. Enter the Service mode. (See page 1-4-1)
2. Press "VOL
p
" button on the service remote control
unit. Display changes "C/D," "7F," "FM," "ACCESS
CODE," "9V," and "RC5" cyclically when "VOL
p
"
button is pressed.
3. To set each data value shown below, press "CH
o
/
p
" buttons on the service remote control unit.
7F --- Set to "FF."
FM --- Set to "OFF."
ACCESS CODE --- Set to "OFF."
9V --- Set to "OFF."
RC5 --- Set to "OFF."
Note:
C/D
data value does not need to be adjusted at
this moment.
SCREW
Fig. 1-1
Remote control unit (Bottom)
J 1
Fig. 1-2
Remote control CBA
J 1
Fig. 1-2
Remote control CBA
Test point
Adj. Point
Mode
Input
D613
Cathode
(+B)
C613(-)
(GND)
VR601
---
-----
Tape
M. EQ.
Spec.
---
DC Voltmeter
Plastic Tip Driver
+114
±
0.5V DC
