HP 181A manual BAD Code

2

Chapter 2 Service

The HP 53131A/132A Calibration Procedures

3Press the appropriate arrow keys to enter the security code

“53131”, for example, if 53131 is the security code by performing the following steps:

a.Press ⮕ key four times.

The Counter should display CODE: 00000.

b.Press ⬆ key five times.

The Counter should display CODE: 50000.

c.Press ⮕ key once, and then press ⬆ key three times. The Counter should display CODE: 53000.

d.Press ⮕ key once, and then press ⬆ key once. The Counter should display CODE: 53100.

e.Press ⮕ key once, and then press ⬆ key three times. The Counter should display CODE: 53130.

f.Press ⮕ key once, and then press ⬆ key once. The Counter should display CODE: 53131.

g.Finally, press Enter key.

CAL UNSECURE is displayed.

NOTE	If “53131” is NOT the correct security code, the Counter will display
	BAD CODE.

4Press Scale & Offset key until CAL: OFFS 1 ? is displayed.

5Press Enter key.

A scrolling message on the display will ask you to remove any signals connected to Channel 1. Follow the instruction.

2-16 Assembly-Level Service Guide