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3.9 Checking Magnetron Heater
Voltage
Magnetron heater voltage is formed on the
MD Board of the scanner unit, and is
preadjusted at the factory for use with any
length of signal cable. Therefore no adjust-
ment is required. However, check magnetron
heater voltage as follows:
1. Turn on the radar and leave it in
stand-
by.
2. Open the scanner cover.
3. Unfasten two screws to remove the RF
section cover.
DANGER
ELECTRICAL SHOCK HAZARD
This check is done with the
power on — DO NOT touch
the magnetron.
Magnetron
U
n
f
asten two
screws.
Figure 3-8 Scanner unit, cover opened
4. Connect a multimeter, set to 10 VDC
range, between test point J825#4 and
J825#6(GND) on the RTB Board
(03P9249).
Measure voltage
at this connector
(J825).
Figure 3-9 Scanner unit, cover removed
5. Confirm that the meter reads 7.5 V ±0.1 V.
6. Close the scanner cover and tighten the
cover fixing screws.