HP 53181A - Page 204

Chapter 6 Backdating
Backdating Hardware
6-4 Assembly-Level Service Guide
6
CHANGE 3 (New TCXO boards)
Page 2-47. Troubleshooting the Counter
Add the following as step 4a:
4a If the Counter under test contains Option 010 or 012 High
Stability Timebase, perform the following:
a. Disconnect the power supply’s two-wire cable from J2 of
A6 High Stability Timebase Assembly as shown in Figure 2-10.
Figure 2-10. A4 AC Power Supply -9V Output Check (Option 010/012
Only)
J2
-9V
(Gray)
GND
(Wht)
1
Ext
Arm
Ref
In
I
N
P
U
T
S
!
AC LINE:
10 MHz Out
60 VA
100 - 120 VAC
200 - 240 VAC
50/60/400 Hz
50/60 Hz
OPTIONS
001 MS Oven
010 HS Oven
SERIAL PLATE
To Configure:
Hold Recall during turn-on.
Osc Adjust
RS - 232
ISM 1-A
92
FOR LABORATORY USE BY
Q
UALIFIED PERSONNEL
FOUR USAGE EN LABORATOIRE
PAR PERSONNEL QUALIFIE
HP-IB
Talk Only
2
3
A4
AC Power Supply
Assembly
A6
High Stability
Timebase
Assembly