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1.
TROUBLESHOOTING
(1) Check the tuner voltage
| PinNo. | Terminals | Voltages |
Measuring conditions
Next step when NG
| 2 | acc | to-ts |
BU
Measure the voltage with setting
Replace SW100
the selector SW to UHF
5
33.0
When the indicator is at channel
Go to B-1
"TV-14500,N
2~6 ch of VHF.
4.0
Measure the voltage with setting
Replace SW100
the selector SW to VHF
Go to the step of
"No voltage"
(2) Measure the collector waveforms of IF Amp. Q200
ATOM
—
4— 16.7 msec
if the waveforms does not appear:
Replace the tuner.
l
Varies between 50 to 500mV.
(3) Check the waveforms at pin no.18 of IC200.
Check that the waveforms as below appears when the indicator passes the receiving channel.
|
|
12V
— 64.0 psec
When the waveforms appear:
Go to (5).
(4) Measure the waveform at pin no.19 and 20 of 1C200.
Check that the waveforms as below appear when the indicator pases the receiving channel.
TT
aan
«— 16.7 msec
if the waveforms do not appear: Replace component in order of C268, T200 and IC 200.
| | Varies between 20 to 50 mV.
4
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