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WARNING: Disconnect and lockout AC primary power prior to servicing
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8.4.6 Chip Cap Replacement
It is a common technique to use two irons with small tips (one on each side) when
removing or installing chip caps. Both sides of the chip cap should be heated
simultaneously to avoid residual stresses which might later cause a failure.
NOTE: Note that the capacitor values listed in the Parts List are typical values.
Check the value of the capacitor to be replaced before ordering a replacement part.
Note that the capacitor values listed in the Parts List are typical values. Check the value
of the capacitor to be replaced before ordering a replacement part.
8.5 Test Procedure Solid State TV Modules
Install transmitter section of module test fixture into transmitter.
Attach RF output cable to module test fixture through access slot in the fixture, and
connect to wattmeter and 50 ohm load (1kW).
Install input wattmeter. Use RF input access cable on side of test fixture.
Attach extension section and install module onto fixture. (Do not install module
protective cover at this time.)
Perform a complete visual inspection of the module to be repaired.
Remove red wire from TB1 and install a current meter in line. The current meter needs
to be capable of measuring 400 mA steps accurately, and up to 10 Amps total. A clampon
probe, if available, makes the task easier. Use an ammeter that is resistant to RFI.
8.5.1 Pre-operational Checks
8.5.1.1 Initial Power Up
Close CB2, this breaker is only to protect the wiring between transmitter and test
fixture.
Apply 50 Volts DC only to module by turning on circuit breaker CB1. (Red LED on
module front panel will be on.)
The +5 and +15 Volt PCM supplies can be checked when 50 Volts is applied.
8.5.1.2 Idle Current Check
The module cover section of the extender assembly should be removed so that no RF
drive can be applied.
Enable module with MODULE ENABLE switch on test fixture.
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