C1
TM9-4935-481-14-1
Table 3-11. DMS-D Performance Test-Continued
Table 3-11. DMS-D Performance Test-Continued
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
Peak_ Detector Check and Low Frequency Oscillator Adjustment
1193
DMM
Observe a reading of +2.955 +3.045 Vdc.
1177
Return all switches to the initial switch settings, leaving the
(135)
MAIN POWER and DMS switches ON.
1194
PD
Release the READ switch.
1178
MCP
SELECTOR A switch to E20.
1195
OSC
Connect a BNC tee to the CHANNEL A INPUT.
1179
PD
HORIZ/REF/VERT switch to HORIZ.
1196
OSC
Connect a cable from the BNC tee to the EXT TRIG INPUT - 1.
1180
ITP
INTERNAL TEST switch to 2.
1197
MCP
Connect a cable from J13 to the BNC tee.
1181
PD
Actuate and hold READ switch to observe a reading of +2.492 to
1198
OSC
Adjust the display as required so that 1/2 of the waveform is
DMM
displayed.
+2.508 Vdc.
1199
OSC
Observe the period of half the wavefm to be 900 to 1100 msec.
or
Replace card A21. Check A21
(135)
pins 4, 14, 8 and 1.
1200
TP
FREQ(HZ) switch to 1.0.
1182
ITP
INTERNAL TEST switch to OFF.
1201
Wait at least 4 minutes for oscillator stabilization.
1183
PD
HORIZ/REF/VERT switch to REF.
1202
PD
Actuate and hold READ switch.
1184
TP
FREQ(HZ) switch to 5.0.
1203
DMM
Observe a reading of +2.955 to +3. 045 Vdc.
1185
Wait at least 4 minutes for oscillator stabilization.
(136)
1186
PD
Actuate and hold READ switch.
1204
PD
Release the READ switch. 13
1187
PD
Adjust LO FREQ AMPTD control to +3.00 0.003 Vdc. After each
0
1205
OSC
Adjust the display as required so that 1/2 of the waveform is
DMM
displayed.
adjustment, wait a minimum 3 minutes before taking readings.
1206
OSC
Observe the period of the waveform to be 450 to 550 msec.
(134)
(136)
1188
PD
Release the READ switch.
1207
TP
FREQ(HZ) switch to 5.0.
1208
Wait at least 4 minutes for oscillation stabilizan.
tio
1209
PD
Actuate and hold READ switch.
1189
TP
FREQ(HZ) switch to 0.5.
1210
DMM
Observe a reading of +2.955 to +3, 045 Vdc.
1190
MCP
SELECTOR B switch to E19.
(137)
1192
PD
Actuate and hold READ switch.
3-120