4.
Confirmation of Operation and Readjustment
4.1
Outline
When an FET is replaced in the PA unit, "4.2.2 Adjustmemt of ldling
Current'~
is re-
quired. . .
..
. .
When the PA unit is replaced, "4.4.2 Adfustment of APC Circuit" and "4.4.3 Adjustment
of ALC Circuit" is required.
When the power supply unit is replaced, "4.3.1 Adjustment of Output Voltage" and
"4.4.1 Adjustment of Meters" is required.
4.2 Adjustment of 2
PA
Units
. All adjustable parts of the PA unit are in the CCB-367 PA control circuits.
4.2.1 Adjustment of Heat Sensor
[ Required instruments ]
(1
)Digital tester
(2)
Thermometer
< Adjustment procedures >
(1
)Measure
TP1
valtage with a digital tester.
TP1
voltage:
ETP1
140Q-1500mV
(2)Measure the room temperature (Ta).
(3)Calculate TP3 valtage to be adjusted with the following formula:
ETP3=ETP1-(75°C-Ta) X 4.5
[Example] Where
ETP1=1450
mV and Ta=25°C,
ETP3=1450-(75-25) X 4.5 = 1450-220=1230 mV
(4)Adjust
RV1
to the calculated valtage while measuring TP3.
(5)0btain
ETP2
by measuring TP2 voltage.
Using the same formula in step (2),(3)
ETP4=ETP2-(75°C-Ta)X 4.5
Adjust RV2 to the calculated valtage while measuring TP4.
(6)Confirm that the fan does not oparate in this state.
26
Downloaded
by
RadioManuai.EU
To Next Page
Loading...