6

Chapter 6 Backdating

Backdating Hardware

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.

A6

High Stability

-9V

GND (Wht)

Timebase Assembly

(Gray)

J2

A4

AC Power Supply

Assembly

2

1

!

3

Ref

IIn

N

P

U

Ext

T

S

 

LINE:

 

 

AC

50/60/400Hz

50/60Hz

 

60VA 100-120VAC

200-240VAC

Out

10

1-A ISM

OPTIONS010 HS

Oven

MS

001 -IB

HP

Only

Talk

92

 

 

 

SERIALPLATE

Oven

 

-on

.

- 232

 

 

RS

 

 

turn

 

 

 

during

 

 

Configure:

 

 

To

Recall

Adjust

 

 

Hold

Osc

 

 

Figure 2-10. A4 AC Power Supply -9V Output Check (Option 010/012 Only)

6-4

Assembly-Level Service Guide

Page 204
Image 204
HP 181A manual Change 3 New Tcxo boards, 10. A4 AC Power Supply -9V Output Check Option 010/012 Only