No
CLOCK
0
1
2
3
LOCATION
070-34
070-37
170-34
170-37
No
between 1.8 volts
and 2.0 volts
peak-to-peak
FB687
CHAIN
[6] Is waveform
CHECK 39B OSCILLATOR
AND
Yes
probe to terminal
Connect scope
peak-to-peak with
NCLK chain powered
[TABLE A]
201 on
FB687
pack
[1] See NOTE 1.
[2] Is waveform
between 0.5 volt
and 0.9 volt
down [NOTE 2]
Yes
terminal 201 on
FB687
pack
clock chain removed from
service [TABLE A]
FB214
pack associated with
[3] Remove probe from
[5] Connect scope probe
to terminal 018 of
switch associated with
clock chain removed from
[4] See NOTE 3. At power
service [TABLE A], depress
ON
pushbutton (
PWR OFF
lamp extinguishes)
TABLE A
PWR SW
066-03
166-03
166-68
LOCATION
LOCATION
FB214
066-33
066-39
166-33
166-39
066-68
NOTES
probe signal
probe ground lead
terminal before
making scope
diagnostic after
until diagnostic
completes before
next step
proceeding to
depressing
ON
pushbutton, wait
1. Connect scope
to ground
3. If chain goes into
connection
2. Levels are lower
because chain is
powered down
DLP
234-151-013
538
Issue 8
DEC 1995
PAGE 1 of 9
