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TELEVISION
• The Circuit may be used to test the Voltage
Regulators used in the Power Supply.
•The voltages shown apply to a 5V regulator.
•If a larger regulator is being tested follow these
rules:
1. Positive On input, Negative to GND
2. Begin by inputting 2-4V
3. Check current, if it is excessive then there
is possibly a short.
4. Raise voltage approx 4 volts above
regulator voltage and check that the DC does
not exceed the ICs rating
5. Always monitor current and stop if current
becomes excessive.
Connect power supply as shown in Figure. Positive lead should
be connected to Regulator IC Pin1 and negative lead should be
connected to ground.
Set Power Supply to 2V and observe current readings on the Power
Supplies current meter.
Less than 0.75 Amp
While monitoring IC's output, slowly increase the
power supply voltage from 2 to 7.5V.
output (pin 2) 5
Increase power
supply voltage to
13VDC
IC801 output (pin 2) less
than 5.7 VDC
Observe current readings on the Power
Supplies current meter.
Yes
IC functioning
Less than 0.75 Amp
Properly
No
Yes
No
VDC
Yes
No
Yes
No
Troubleshoot and
repair any shorted
components.
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