IBM System/32 Introduction And Maintenance Manual page 250

4.8.0 2851pm OSCILLOSCOPE FIGURES
(Continued)
Good Belt Motor Drive Pulse
Horizontal 2 ms/div
Vertical 20V /div
Channel 1 Belt Motor Phase A
(P4-1 or A23C42)
Bad Belt Motor Drive Pulse
High load
Horizontal 2 ms/div
Vertical 20V /div
Channel 1 Belt Motor Phase A
(P4-1 or A23C42)
--
--
-- --
-~
-- --
--
- -r- -
•
1
- -,-- -'- -r-
- - - - - - - - -r- -
Bad Belt Motor Drive Pulse
Phase capacitor removed
Horizontal 500 Ils'!div
Vertical 20V /div
Channell Belt Motor Phase A
(P4-1 or A23C42)
Emitter Pulse
Horizontal 500 Ils.!div
Vertical Top trace .5V /div
Bottom trace .2V /div
Channell Emitter Pulse
Positive input (A23F44)
Negative input (A23F42)
Do not ground either lead.
1100 mV minimum peak-to-peak
Channel 2 Print Subscans (A23F47)
4-160