Specifications

R7902 IS R7923 (1100 OHMS ) WHEN POTENTICMETERS R7902 AND R7919
ARE
PROVIDED ON CONTRACT DAAB05 -73 – 6
- 1632 (1973) AND
SUCEEDING CONTRACTS.
EL4YC004
Figure 15. Test Set, Radio TS-1777/VRM-1 and TS-1777A/VRM-1
front panel chassis, top view.
Page 35, paragraph 43. The following is added
after subparagraph d:
d.1. DC Circuits (Positions 2 and 19). The
following procedures are performed on those
equipments with potentiometer R7902 on position 2
of switch R7910 and potentiometer R7919 on posi-
tion 19 of the switch (fig. 15 and 39.2).
(1) Reduce the 721A output to
0 volt dc. Use
the TS-443/U to measure the 721A output.
(2) Turn the TS-1777A/VRM-1 selector to
position 2.
(3) Set potentiometer R7902 (fig. 11.2 and 15)
approximately midrange.
(4) Raise the 721A output until the GREEN
indicator lights. The output of the 721A should be
between 19.00 and 21.10 volts dc.
(5) If necessary, adjust potentiometer R7902
to assure the condition in (4) above.
(6) Reduce the 721A output to
0 volt dc.
(7) Turn the TS-1777A/VRM-1 selector switch
to position 19.
(8) Set potentiometer R7919 (fig. 11.2 and 15)
approximately midrange.
(9) Raise the 721A output until the GREEN
indicator lights. The output of the 721A should be
between 13.00 and 14.70 volts dc.
(10) If necessary, adjust potentiometer R7919
to assure the condition in (9) above.
Make the following changes as idicated:
8