TM 11-5820-801-30
on the bracket mount for connector J1. Subassembly S1
3-3. Remote Control/Monitor Assembly 3A1 Voltage
contains several parts including a split pushbutton switch
and Resistance Measurements
and four indicator lamps DS1, DS2, DS3, DS4. The panel
WARNING
lamps can be separately replaced, when faulty. A
When 1 CB1 and 1CB2 are set to ON this
defective switch, however, requires replacement of the
assembly contains dangerous voltages.
complete subassembly. With W5P1 connected to J1 and
a. Display Meters. The meters used in 3A1 to
display temperature (M1 and M3) are identical to 1M1
voltage checks on CHANNEL SELECT pushbutton
(para 3-2e and para 2-9b) The time totalizing meters
(NM2 and M4) are identical to 1M3 (para 2-8c) These
3A1 meters are connected in parallel with the
corresponding Unit 1 meters so that indications on Unit 1
S1 in
S1 In
front panel and 3A1 front panel are identical When the
Position o
Position 1
3A1 meters do not track the Unit 1 meters then check the
Measure
Measure
3A1 subassembly. CRYOGENIC TEMP CHANNEL 1
C to E1:
28 + 3V
C to E1:
28t 3 v
meter M1 and CRYOGENIC TEMP CIIANNEL 2 meter
NO to E1:
0V
NO to E1:
281 3 V
M3 can be checked in the same manner that 1M1 is
NC to E1:
283V
NC to E1:
OV
checked. If the time totalizing meters--1M3, 3A1M2,
G to A:
2873V
G to B:
28t3V
3A1M4-do not operate when 120 + 12 V, 55 + 8 Hz is
G to B:
OV
G to A:
OV
applied across their terminals (normal operating voltages
when 1CB1 and 1CB2 are set to ON) they should be
With cable removed from JI measure the following
b. Parts Layout and CHANNEL SELECT Switch S1.
S1 Terminals
Parts layout of Remote Control/Monitor Assembly 3A1 is
C-NC
C-NO
shown in figures 3-4 and 3-5. Serial No 001 is shown
SI Position
(ohms)
(ohms)
because it has a toggle switch (S2, fig. 3-5) to switch +
28 Vdc to noise generator 3A13A3 used in Serial No. 001
1
0
infinite
installation only (para 2-20c). Tie points E1 and E3 are
2
infinite
0
3-7
