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TROUBLE SHOOTING
TRANSMIG 250i
Manual 0-5188
6-3
TROUBLE SHOOTING
6.02 Tools Needed for Troubleshooting and Servicing
Art # A-09849
Figure 6-1: Servicing Tools
6.03 Checking Unit Before Applying Power
!
Turn SW1 to OFF position, and disconnect unit from primary line voltage before working on unit.
Significant DC voltage can remain on capacitors after unit is Off. Wait until all front panel LED’s are off
before removing case.
Before troubleshooting or applying power to unit, complete the following checks to avoid causing further
damage.
Pre-Power Check List
The following are resistance measurements on the Transmig 250i power board while it is in an unpowered state.
The first location is the placement of the positive terminal of a Digital Multimeter (DMM); the second location is
for the negative terminal of the DMM and follows the word “to” in each line.
• DC+ to GND PRI = Ramps slowly from 23.3 to 42K
• DC+ to lower (left) leg of R20 = 33 ohm
• DC+ to Large Upper heat sink = 22.42K
• DC+ to Transformer Primary Connections = 423K
• GND PRI to Transformer Primary Connections = 225K
• Transformer Primary Connections to Large Upper heat sink = 225K
• Transformer Sec-Sec = < 5 Ohm
• Transformer Sec to IND Out = 168K
Содержание 250i Transmig
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