Models 78100A, 78101A Section V
Maintenance
PROBLEM: INADEQUATE TRANSMISSION RANGE
;TART
USING TEST BOX ADJUST CHANGE, ADJUST
00780-63030, %t TRANSMITTER TX POWER IS TX BOARD; OR
POWER METER, NO HI FREQUENCY NOW AT LEAST TROUBLESHOOT,
TX POWER IS AT CIRCUITS TO 1.25mW USING EXTEN.
LEAST 1.25 mW 1 INCREASE POWER PROCEDURE 12
I
(Return only if range is still inadequate)
FINDTXPOWER -117*
CHANGE ANTENNA CHANGE CHASSIS
WHEN RANGE/
OR EXTERNAL COVER CABLE TO
BATTERY LIGHT
H CABLE, IF ANY HF BOARD
JUST TURNS ON
THAN 1 dB
THAN -1 14 dBm
c 1
POWER LOSS CHANGE, ADJUST
FROM J3 TO YES HF BOARD; OR
I -
52 IS hESS TROUBLESHOOT,
TWMlrrer PROCEDURE 13
Figure 5-5. Board Isolation Procedure, Inadequate Transmission Range
PROBLEM: ELECTRODE LIGHT IS ON WHEN THE TRANSMITTER IS OFF,
BUT NOT WHEN TRANSMITTER IS ON.
I START PP NOISE IS GREATER CHANGE, ADJUST
THAN (PP SUBCARRIER LF BOARD; OR
PLUS 2 VOLTS) TROUBLESHOOT,
REMOVE CHASSIS COVER
USING EXTEN.
(SHIELD) FROM HF BOARD.
PROCEDURE 14.
DISCONNECT SUBCARRI ER
WIRE (W-V) FROM HP BOARD I
PIN. MEASURE PP AMPLITUDE
OF SUBCARRIER AT TP6
(MARKED SUB) WITH TRANS- PP NOISE IS LESS THAN
MITTER ON, AND PP NOISE I (PP SUBCARRIER PLUS
CHANGE, ADJUST
ON SUBCARRIER WI.TH TRANS- 2v )
MITTER OFF. HF BOARD; OR
TROUBLESHOOT,
PROCEDURE 13.
Figure 5-6. Board isolation Procedure, Electrode Light Problem
078 100-2 5-9 |
ACEC
HEWLETT-PACKARD
