# Service bulletin SIL 771

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10182985
- Published by NHTSA: 2020\-11\-24
- Manufacturer's number: SIL 771
- Manufacturer's date: 2020\-11\-09
- NHTSA component: EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM

## NHTSA's summary

Below Rotation Valve Driver \(BRVD\), Above Rotation Valve Driver \(ARVD\), and CAN bridge circuit boards on Altec derricks require the use of a clear potting compound so diagnostic light emitting diodes \(LEDs\) on the boards are visible for troubleshooting. Altec has discovered that a black potting compound was used on some of these circuit boards on the affected units, which prevents the LEDs from being visible. Altec requires that each unit be inspected for visibility of the diagnostic LEDs no later than the next periodic maintenance interval. Use the Inspection Procedure beginning on page 2. If circuit board replacement\(s\) are required, use the Replacement Procedure beginning on page 6.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10182985-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10182985-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Equipment and accessories

## Vehicles listed

- 2020 ALTEC DIGGER DERRICK

JSON: [/v1/bulletins/10182985](/v1/bulletins/10182985)

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