TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
9
As last indicated, except: --- As last indicated, except:
Differential voltmeter
Master Control-Indicator
a.
a.
Connect differential voltmeter
-26v min, -30v max.
C-6988/TPN-8
positive (+) test lead to -28V
Range: 50
testpoint TP604 on PP-
Polarity: -
FTC: ON
3383/
NULL: 1
TPN-8 Power Supply. On
differential voltmeter, adjust
A, B, C, D, and E switches for
a null on differential voltmeter.
Observe voltage indication on
switches.
b. Disconnect differential volt-
b.
10
As last indicated, except: ---
As last indicated ----
None.
vtvm
meter test lead.
a. Connect vtvm COMMON test
a.
RANGE: 3v
2 vac max.
SELECTOR: AC
lead to chassis ground. Connect
vtvm AC probe to -28V test-
point TP604 on Power Supply
PP-3383/TPN-8. Observe
indication on vtvm.
b. Remove vtvm test leads from
b.
None.
chassis ground and -28V
testpoint TP604.
NOTE. Do not replace rear
cover on Control-Indicators C-6988/
TPN-18 until tests are
completed.
(3) Pulse Generator 0-1333/TPN-18 pulled
4-17.
Testing Ppi Scan Displays
out for access to top deck controls and adjust-
ments.
a. Test Equipment and Materials Required.
(4) If used, associated IFF equipment turned
Multimeter ME-26A/U (vtvm).
on, aligned, and on Electrical Equipment Cabinet
CY-4922/TPX, IFF ANTENNA switch placed to
b.
Equipment Conditions.
ON and IFF ANT SCAN CONT switch placed to
RADAR.
(1) Radar-Set AN/TPN-18 turned on and
aligned.
(2) Rear cover removed from Control-Indica-
tors C-6988/TPN-18.
c.
Procedure
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
Vtvm
1
a.
Radar Receiver-
a.
RANGE: 100v
On Control-Indicator C-6988/
Ppi sweep trace just
Transmitter RT-818/
SELECTOR: +
TPN-18 under test, adjust
visible and in sharp
INTENSITY and FOCUS con-
focus.
TPN-18 control panel
trols for normal operating
MAIN POWER: ON
levels.
HV: OPERATE
b.
Connect vtvm COMMON test
SCAN: ON
b.
lead to GRD testpoint TP2001
None.
Master Control-Indicator
on mixer amplifier.
C-6988/TPN-18 and
c.
Connect vtvm DC test lead
Pulse Generator
c.
to VIDEO testpoint TP2004
+3Ov (nominal).
O-1333/TPN-18
on
POWER: ON
mixer amplifier and observe
TRANSMITTER: OFF
indication on vtvm.
SCAN MODE: SEARCH
d. Remove vtvm DC test lead
d.
None.
SCAN: OFF
from VIDEO testpoint
VIDEO GAIN: Fully ccw
e.
TP2004.
None.
Control-Indicator
e. On vtvm, place SELECTOR
C-6988/TPN-18
f.
switch to (-).
-40v (nominal).
and Pulse Generator
f.
Connect vtvm DC test lead
O-I333/TPN-18
to INTENS GATE testpoint
under test
TP2005 on mixer amplifier
and
observe indication on vtvm.
4-35
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