HP 54501A - CRT Monitor Signals Check; CRT Monitor Assembly Cable Pin Assignments

6-15 . CRT Monitor
Signals Check
1 .

Remove top cover from instrument
.
2 .

Check W6
for signals listed in table 6-2 . Refer to figure 6-13 for cable location . The
dynamic video signals
FB
(FULL
BRIGHT)
and HB
(HALF BRIGHT) are single-ended TTL
inputs . Check for activity
on these pins
.
Table 6-3 is the truth table for these signals .
Table
6-2
. CRT Monitor Assembly Cable Pin Assignments
HP 54501A SERVICE
PIN SIGNAL
DESCRIPTION PIN SIGNAL DESCRIPTION
1 +5 V (DIGITAL) 2
+12 V (DISPLAY)
3 GROUND
(DISPLAY) 4 GROUND (DISPLAY)
5
+12 V (DISPLAY) 6 GROUND (DISPLAY)
7
+12 V (DISPLAY) 8 GROUND (DISPLAY)
9 +12 V (DISPLAY) 10 HSYNC
11
VSYNC 12 +12 V (DISPLAY)
13
GROUND (DIGITAL) 14
GROUND (DIGITAL)
15 GROUND (DISPLAY) 16
FB
17 GROUND (DISPLAY) 18
HB a
19 GROUND (DISPLAY)
20 +5 V (DIGITAL)