AT&T Bell System Plant Series Alignment Instructions page 7

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TABLE A (Cont)
20A Toll Testboard Controls
Distortion
Calibrator
Panel
REAR
KEYS
FRONT
KEYS
TEST
Keys
DMS
BIAS
TMR
FRR LEV-OUT
HI
DTA
SUPV SND FRS
LEV CHK
DLY
DIST+ TST TMS
DLY
DIST- DMO SND
NOR
LO
SUB
AGC
19. Single hit calibration SUPV
20. Sync Logic
21. Signal generator
timing check
22. Hit counter check
23. Demodulator
DTA
SUPV
SUPV
DTA TST NOR
SEND
SUPV
Switches
CHAN GEN DIST GEN TST MULT CONT SG
TMS
SEL SPEED CTR MODE OFF SGL INT MDM
BIAS
TMR
DATA READ
READ
SETTING
20 RDM TST SGL
INT SG
20 RDM TST SGL INT SG
95.5 16
MULT
Action
Rotate DIST potenF-
ometer clockwise
1
until a single hit ~s
just registered peri-
odically on regist~r.
I,
Push SYN RESET
button.
Press RESET-STAUT
button between
bursts.
Switch DMS key to
DT A and rotate
DIST potentiome1,er
counterclockwise ,
until register sto~s
counting. I
1
200
OFF
MDM Push SYN RESET
button.
Expected
Results
Meter reads peaks of
155 1, SECTION 107-302-500
Action If
Test Fails
19 to 20%. OVER- .
FLOW lamp stays out Trouble.shoot distortion
when RESET-START meaSurmg set.
button is pushed.
OUT SYN lamp goes
out and stays
out.
Time between hits
=
7 .2 to 7 .3 seconds.
Register registers
5-10-15-20, etc.
When switched to DTA
mode, register counts
Troubleshoot distortion
measuring set.
Troubleshoot signal gen-
erator.
1-2-3-4, etc. Register Troubleshoot hit counter.
should stop counting
single hits when meter
reads less than 19.
0 to 5%.
OUT SYN lamp goes out
and stays out.
Distortion meter reads
0
to 5%
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