Sharp 14V-L70M Service Manual - Page 5

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Note:
(1)
When performing any adjustments to resistor controls and transformers use non-metallic
screwdrivers or TV alignment tools.
(2)
Before performing adjustments, the TV set must be on at least 15 minutes.
CIRCUIT PROTECTION
The receiver is protected by a 3.15A fuse (F701),
mounted on PWB-A, wired into one side of the AC line
input.
+B DC REGULATOR CONFIRMATION
The +B DC output voltage adjustment is not included
in this circuit. However, should confirmation be
required proceed as follows.
1.
Actuate receiver with 230V AC input voltage.
2.
Receive a local channel.
3.
Connect positive lead of digital voltmeter to C754
positive side on PWB-A; negative lead to chassis
ground.
4.
Confirm this voltage reading is as below.
CAUTION:
The reading should be within +130.0
DC to ensure normal function and circuitry
reliability.
X-RADIATION PROTECTOR CIRCUIT TEST
After service has been performed on the horizontal
deflection system, high voltage system, B+ system,
test the X-Radiation protection circuit to ascertain
proper operation as follows:
1.
Apply 230V AC using a variac transformer for
accurate input voltage.
2.
Allow for warm up and adjust all customer controls for
normal picture and sound.
3.
Receive a good local channel.
4.
Connect a digital voltmeter to TP653 and make sure
that the voltmeter reads 21.1
5.
Apply external 27.9V DC at TP653 by using an
external DC supply, TV must be shut off.
6.
To reset the protector, unplug the AC cord and make
a short circuit between TP651 and TP652. Now make
sure that normal picture appears on the screen.
7.
If the operation of the horizontal oscillator does not
stop in step 5, the circuit must be repaired before the
set is returned to the customer.
INSTALLATION AND SERVICE INSTRUCTIONS
±
3.0V
±
1.5V.
HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked to
verify that the receiver is operating within safe and
efficient design limitations as specified checks should
be as follows:
1.
Connect an accurate high voltage meter between
ground and anode of picture tube.
2.
Operate receiver for at least 15 minutes at 110~230V
AC line voltage, with a strong air signal or a properly
tuned in test signal.
3.
Receive a good local channel.
4.
The voltage should be approximately, 23.5kV (at
picture MAX bright center condition).
If a correct reading cannot be obtained, check
circuitry for malfunctioning components.
5
14V-L70M