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Ericsson PCS Series Maintenance Manual

Ericsson PCS Series Maintenance Manual

Uhf personal radios
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MAINTENANCE MANUAL
SERVICE SECTION
PCS™ UHF PERSONAL RADIOS
TABLE OF CONTENTS
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Cover
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Cover
PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DISASSEMBLY PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Documentation To Have Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RX Audio Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TX Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receive Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmit Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference Oscillator U203 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCO A202 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prescaler U202 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bilateral Switch U2B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phase-Lock-Loop U201 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transistor Q201 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMPONENT REPLACEMENT6
PA Module Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Chip Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Integrated Circuits (IC 's) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INTRODUCTION
This Service Section contains information necessary for
aligning and troubleshooting the PCS™ two-way FM Per-
sonal Radio. This maintenance manual also provides steps
for preventive maintenance, disassembly and procedures for
replacing the PA module, chip components and integrated
circuit modules.
LBI-38279A
FOR
ADJUSTMENT
Initially, the PCS Personal Radio is aligned and ready
for use before leaving the factory. However, if maintenance
has been performed, the following procedure is intended to
be used by a qualified service technician (refer to Figure 1
for location of adjustment controls and test points).
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Printed in U.S.A.

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Summary of Contents for Ericsson PCS Series

  • Page 1 LBI-38279A MAINTENANCE MANUAL SERVICE SECTION PCS™ UHF PERSONAL RADIOS TABLE OF CONTENTS Page INTRODUCTION ..........Front Cover ADJUSTMENT .
  • Page 2 1. Set the radio to Frequency channel F1 and apply a strong tions are not followed. than 1.7 watts on any frequency in the 403 to 440 and 440 to carrier at F1. 470 MHz bands. Copyright© February 1990, Ericsson GE Mobile Communications Inc.
  • Page 3 LBI-38279 Figure 1 - Location Of Tuning Controls And Test Points...
  • Page 4 LBI-38279 Figure 2 - Interconnection Diagram...
  • Page 5: Preventive Maintenance

    LBI-38279 2. Remove the two (2) clips which hold the power module 8. Determine if the radio is in programming mode. Any mo- PREVENTIVE MAINTENANCE PROBLEMS against the casting using a small flat blade screwdriver to mentary short on the MIC HI line will put the radio in the pry between the clip and the top of the power module.
  • Page 6 LBI-38279 Receive RF Circuits the microprocessor. The CAS input along with the LIM- 3. Check to see if the RX low pass filter output is being 8. Check to see if VCO drive is present. ITED TONE DATA for Channel Guard are the proper mi- gated to the post limiter filter by the TX CG switch.
  • Page 7 LBI-38279 To Remove Chip Components Bilateral Switch U2B: Bilateral switch U2B on Loop Filter Board A201 is used to 1. Grip the component with tweezers or needle nose pliers. short around parts of the loop filter during channel scan. A shorted gate (to ground or adjacent gate) may be isolated by 2.
  • Page 8 LBI-38279 This page intentionally left blank...