Rf Bench Repair; Introduction; What You Need - Philips 50 T Series Service Manual

Introduction

What You Need

Chapter 8 - RF Bench Repair
RF Bench Repair should be performed when the low-frequency sections of
the Series 50 T Transmitter and Receiver have passed the tests in the
Troubleshooting Flowcharts Chapter 4 with no problems. RF associated
Transmitter and Receiver problems should be identified and resolved using
the RF Bench Test.
Caution
Static electricity will damage sensitive electrical circuitry. Ensure you are
adequately grounded before touching any circuit board or its associated
components.
The following equipment is required to perform the test and repair:
Equipment
Oscilloscope
Active Probe
Spectrum Analyzer
Signal Generator
2 BNC Cables
BNC Adapter
AC coupler
The goal of the RF Bench Test is to find out which of the following sections is
defective:
Transmitter VCXO
Receiver Preamplifier Board
Receiver Assembly
Receiver VCXO
If the operating range is decreased or no transmission is possible, the
following tests given in this chapter should be performed.

RF Bench Repair

Requirements
>10MHz, 100 mV min
500 MHz (min.)
100 Hz to 500 MHz (min)
Freq. Accur.:<2ppm
500 MHz (min.)
50 Ohms
0.7 to 1.5m long
50 Ohms
0.18uF, 200V
(M1400-6xxxx)
(M1406-60560)
(M1402-6x30x)
(M1402-61xxx)

Example
HP54601A
HP1120A
HP8568B
HP8640B
HP10503A
1250-0080
10240B