C4
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
Replace card A19. Check
1246
OSC
MAIN, EXT - 10O/EXT/INT/LINE switch to EXT.
A19 pins 4 and11.
1247
OSC
DISPLAY switch to CHOP.
Cosine Delay Check
1248
OSC
Both VOLTS/CM switches to .05.
1258
MCP
Remove the cable from J6-70 and connect it to J6-30.
1249
OSC
CHANNEL B POLARITY switch to NORM.
1259
MCP
SELECTOR C switch to H23.
1250
OSC
Both input switches to AC.
1260
OSC
Readjust MAIN, TRIGGER LEVEL as necessary and observe 2.04 to
1251
OSC
Remove the inputs momentarily and djust the position controls
a
2.36 msec.
until the two traces overlap on the middle horizontal line.
Replace card A19. Check
Reconnect inputs.
A19 pins 13 and 6.
1252
OSC
Adjust MAIN, TRIGGER LEVEL until two lines with positive slopes
1261
OSC
TIME/CM switch to .2 MSEC.
are crossing the middle horizontal line of the graticule. The
1262
ITP
INTERNAL TEST switch to OFF.
distance between the two crossings represents the time delay
1263
OSC
Readjust MAIN, TRIGGER LEVEL as necessary and observe 1.02 to
between the two sinusoidal inputs.
1.18 msec.
1253
OSC
Observe this time delay is 1.02 to 1.18 msec. (5.1 to 5.9 large
Perform steps 250, 253, 254 and 255
divisions)
Perform steps 289 through 296,
problem is not c rrected, replace
o
307 through 311 of the Maintenance
card A19. Check A19 pins 13 and 6.
1264
MCP
corrected, replace card A19. Check
A19 pins 4 and 11.
1254
OSC
TIME/CM switch to .5 MSEC.
1265
Return all switches to the initial switch settings, leaving the
1255
ITP
INTERNAL TEST switch to 1.
MAIN POWER and DMS switches ON. Reset the COMPARATOR THRESHOLD
1256
OSC
Adjust MAIN, TRIGGER LEVEL until two lines with positive going
slopes are crossing the middle horizontal line of the graticule.
1266
TKP
VERT(VOLTS) dial to 950.
1257
OSC
Observe the time delay is 2.04 to 2.36 msec. (4.1 to 4.9 large
divisions)
3-122