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HP 141T DISPLAY SECTION
INTERNAL CONNECTIONS
Internal connectors for plug-ins
Internal connectors from top to bottom
 Connector   Type  LHS    RHS  
J2  24 way "Blue" Amphenol  12 1
    24 13
       
J9 Special D-Type A1 A8
       
J11 Special D-Type A5 A1
       
J1 24 way "Blue" Amphenol 12 1
    24 13
Connectors J2, J9 & J11 mate with the upper plug-in unit, either the HP 8553B RF Section, HP 8554B RF Section, HP 8555A RF Section or HP 8556A LF Section.

Connector J1 mates with the lower plug-in unit, the HP 8552B IF Section.

There is also a mating connection between the IF Section 8552B and the various RF & LF Sections 8553B, 8554B, 8555A or 8556A. This uses a special D-type connector with 41 pins and 2 coax's. For details see HP 8552B Mating Connections.

The utilisation of the pins for J1 and J2 varies depending on the plug-in used. For the Oscilloscope the 1400 series plug-ins could also be used.

For details of connectors J9 & J11 see HP 141T Display Section External Connections.

J2 (Upper RF & LF Plug-Ins) Connections
Pin
No
Wire
Colour
141T (J2) 8553B 8554B 8555A 8556A
1 924 Unblanking Gate to HVPS CR27 
       
2 92 +100V also J1 (2)
       
3 93 +248V via R2B
       
4 926 to J1 (16)
       
5 956 -100V via Beam Finder also J1 (7)
       
6 7 -100V also J1 (6)
       
7   n.c.
       
8 978 -12.6V ground return also J1 (8)
       
9 2 +248V also J1 (9)
       
10 903 + Int Trig from J1 (11)
       
11 905 + Int DC Trig from J1 (10)
       
12 5 Horiz Deflection to A6R2
       
13 1 6.3V ac from T1 p14 also J1 (13)
       
14 91 6.3V ac from T1 p15 also J1 (14)
       
15   n.c.
       
16 945 to J1 (4)
       
17 947  Variable Persistence from A5CR27 
       
18 90 Signal Ground also J1 (18)
       
19 coax -1V Cal Sq Wave from
A1R54 / A1R55 also J1 (19)
       
20   n.c.
       
21 97 -12.6V also J1 (21)
       
22 904 - Int Trig from J1 (23)
       
23 906 Sweep Inhibit (DC Stab Plug-In)
from J1 (22)
       
24 9 Horiz Deflection to A6R1
       
Pin
No

Wire
Colour

141T (J2) 8553B 8554B 8555A 8556A
... more to follow as the plug-in units are tested ...
 

J1 (Lower IF Plug-Ins) Connections
Pin
No
Wire
Colour
141T (J1) 8552B(P1)
1
n.c.
+20V
2 92 +100V also J2 (2)
+100V
3 93 +248V via R2A
n.c.
4 945 to J2 (16)
+100V
5 946 -100V via Beam Finder also J2 (7)
n.c.
6 7 -100V also J2 (6)
-100V
7   n.c.
n.c.
8 978 -12.6V ground return also J2 (8)
Ground
9 2 +248V also J2 (9)
+250V
10 905 + Int DC Trig from J2 (11)
 Horizontal Deflection  
11 903 + Int Trig from J2 (10)
Display Uncal Light 
12 9 Vert Deflection to CRT (D3)
Vertical Deflection 
13 1 6.3V ac from T1 p14 also J2 (13)
6.3V ac 
14 91 6.3V ac from T1 p15 also J2 (14)
n.c.
15 coax Chopped Blanking to HVPS via
Z-Axis Int Switch
Ground
16 926 to J2 (4)
Blanking
17
n.c.
n.c.
18 90 Signal Ground also J2 (18)
Ground
19 coax -1V Cal Sq Wave from A1R54 / A1R55
also J2 (19)
n.c.
20   n.c.
n.c.
21 97 -12.6V also J2 (21)
-12.6V
22 906 Sweep Inhibit (DC Stab Plug-In)
from J2 (23)
Horizontal Deflection 
23 904 - Int Trig from J2 (22)
Marker 
24 5 Vert Deflection to CRT (D4)
Vertical Deflection 
Pin
No

Wire
Colour

141T (J1)  8552B (P1)