Bug #1185
Repair status for very first 2001 unit
Added by tin over 6 years ago.
Updated over 5 years ago.
Description
Analog board A39754
Digital board A10142 A08
Self-test issues:
| Test |
A/D input |
Required value |
| 309.1 |
|
|
| 401.1 |
|
+/-1m |
| 402.1 |
|
27 - 37 m |
| 403.1 |
|
-4m - 6m |
| 405.2 |
|
|
| 405.4 |
|
|
| 405.6 |
|
|
| 405.8 |
|
|
| 406.6 |
|
|
Sometimes
| 407.1 |
| 407.2 |
| 407.3 |
| 409.6 |
| 410.1 |
| 411.1 |
| 411.2 |
Recap and clean board
Replaced all caps on analog and digit board
Replaced avalance diodes for bootstrap supply (CR109-CR112)
Desolder U505, U507, U509, clean PCB , solder back.
U508 soldered new 74F00
Replaced CR514,CR513
Replaced Q305 from donor board
Assembled unit, no issues, self-test pass ok.
Unit require calibration (9.9999961V shows as 9.898215V)
- Status changed from In Progress to Closed
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