Tektronix 213 DMM Instruction Manual page 133

CHECK CRT Cl RCUIT
CONTROLS AND
VOLTAGES
CHECK Z AXIS
AMPL AND
BLANKING
CIRCUITRY
CHK & ADJ
SWEEP
GENERATOR
CHK SCOPE
HORIZ AMPL &
HORIZ OUTPUT
AMPLIFIER
CHECK CRT
HORIZ DEFL
SENSITIVITY FOR
8.2 to 9.2 V/DIV
:cK BTRY
IARGER
;.ULATOR
CHECK
BSTRATE
CONNECT AN AC
INPUT SIGNAL AND
ADJUST CONTROLS--~
SET INSTR
CONTROLS FOR A
DMM DCV
MEASUREMENT
SET INPUT
COUPLING TO GND
FOR A STABLE
DISPLAY
<>
CHECK INPUT
ATTENUATOR
CHECK INPUT
BUFFER AMPL FOR
l0X GAIN ON 5mV
& l0mV RANGES,
AND lX GAIN ON
ALL OTHER RANGES
CHECK R128,
Rl29, AND
SCOPE PREAMP
CHK VERT
OUTPUT AMPL
CHK CRT VERT
DEFLECT ION SENS
OF 12.8 to 14.1 V /div
LEGEND
LOGIC DECISION STEP: A performance check
that results in a logic decision to determine the
next step in the troubleshooting process.
ACTION STEP: A step involving setting of con-
trols; component or part checks; voltage, wave-
form, or resistance checks; repair; and recali-
bration.
To use this chart, begin at START and perform any instrument perfor-
mance checks necessary to answer the question in the Logic Deci'sion
Step on the top . horizontal flow line of the chart. Whenever a negative
logic decision (No) is reached, perform each Logic Decision Step and
Action Step in the sub-flow lines of the chart until the original logic
decision (No) is corrected to a positive logic decision (Yes ).Then conti-
nue through the chart until the END is reached, at which time the
Instrument Performance Check should be performed and the instrument
calibrated as required.
Fig. 9-24. Troubleshooting chart.
CHECK DMM
VERT AND HORIZ
OUTPUT AMPL
CHECK
CHARACTER
GENERATOR
CHECK
4-DECADE
COUNTER
REMOVE THE
ANALOG INPUT
JUMPER ON THE
A/D EXTENDER
CARD
CHECK Q258
CHECK AND
ADJUST DMM
REFERENCE
CHECK AND
ADJUST A/O
CONVERTER
CHECK
CHARACTER
GENERATOR
CHECK Q278
CHK AND ADJ
INPUT BUFFER
AMPL
CHK U220, U250
Q230, Q240
Q245, & Q247
YES
SET RMS
PUSHBUTTON
IN
CHECK Q275
CHK AND ADJ
GM CONV
CHECK
Q260, Q262,
Q264 & Q266
CHK U260
213 Service
(GOTO
0
LOCATED
ON BACK
OF THIS
FOLDOUT)
REV C DEC 1980