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HORIZONT

( 38.9 MHz for B / G and D / K, 39,5 MHz for the I) on pins 1 and 2
SAW filter
(Z101). Adjust the coil circuit VL101 until 2.5
DC
the voltage on pin 9 of the microcontroller (IC501).
5.4.2 For TV , including standard L / L '
Switch the system to the required standard. Apply a
intermediate frequency ( IF) signal input to the inverter in accordance with standard
( 38.9 MHz for B / G and D / K, 39,5 MHz for the I) on pins 1 and 2
SAW filter
(Z101). Adjust the coil circuit VL101 until 2.5
DC
the voltage on pin 9 of the microcontroller (IC501).
Switch the system on a standard L. Apply an intermediate
frequency ( IF) signal input to the inverter in accordance with the standards ( 33.9 MHz
for L) in
terminals 1 and 2, a SAW filter (Z101). Adjust the coil circuit to VL101
obtaining a constant voltage 2.5 V at pin 9 microcontroller
(IC501).

***

HORIZONT 11AK41

When replacing ICs and semiconductor devices should be noted that according to
Specifications for these devices in sections
Guidelines for the operation and application of the acceptable
potential value of static
electricity up to 200V .
In reality, the value of the potential is much higher and
varies widely , if not
to take appropriate measures to reduce it .
4.2 Verification of chips
Checking the chip is reduced to the dimensions of constant and pulsed
stresses on their findings and
serviceability connected thereto the circuit element .
When checking and constant pulse voltage at the terminals of IC
it must be remembered that the countdown
conclusions from existing labeling is the key to the case. with
hand print circuit board modules and cassettes start
reference pins IC marked with number 1 ( the count is conducted on
clockwise).
If the above test did not give a positive result ,
is the most effective method
check the functioning of modules and sub-modules is their time
replacement with a known good .
Not be allowed to inspect IC with an ohmmeter . so
as IMS is the most
expensive piece , care must be taken to solve
the question of its replacement.


 
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