13VT-L100/150
13VT-CL10
INSTALLATION AND SERVICE INSTRUCTIONS
Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic
screwdriver or TV alignment tools.
(2) Before performing adjustment, TV set must be on at least 15 minutes.
CIRCUIT PROTECTIONHIGH VOLTAGE CHECK
The receiver is protected by a 4.0A fuse (F701), mountedHigh voltage is not adjustable but must be checked
on PWB-A, wired into one side of the AC line input.to verify that the receiver is operating within safe and
efficient design limitations as specified checks
should be as follows:
X-RADIATION PROTECTOR CIRCUIT
1. Connect an accurate high voltage meter between
TEST
ground and anode of Picture tube.
2. Operate receiver for at least 15 minutes at 120V AC
After service has been performed on the horizontal
line voltage, with strong air signal or properly tuned in
deflection system, high voltage system, or B+ system,
test the X-Radiation protector circuit to ascertain propertest signal.
3. Set to Service mode on, "Mute" and bus data 1(Y-
operation as follows:
mute on).
1. Apply 120V AC using a variac transformer for accurate
input voltage.4. The voltage should be approximately 25.4kV (at zero
beam). If a correct reading cannot be obtained, check
2. Allow for warm up and using the remote controller,
circuitry for malfunctioning components.
set the brightness level and contrast level to maximum.
3. Check the voltage of test point TP653. (ItOs vAfter the voltageoltage test, "Mute" and bus data "0" (Y-mute
off).
should be about 10.1V DC.)
4. Apply external 13.1V DC at TP653 by using an
external DC supply. The increased voltage will cause
the horizontal oscillator to stop and the TV to shut off.
5. To re-start the oscillator, remove the external DC
power supply and short together TP651 and TP652.
Once the TV set operates normally again, remove the
short between TP651 and TP652.
12 |
ACEC
SHARP
