American Diagnostic Corporation (ADC) Proscope 2.5v - Manual (Page 9)

Aperture or lens wheel will not Dirt in or damage Service
turn or does so with difficulty to mechanism required
Visible corrosion on instrument Damage from excessive moisture Service required
Bent Arm Illuminator and Accessories Troubleshooting Guide
Trouble Area Possible Cause Corrective Action
Lamp burned out Replace the lamp with
ADC part #5211-4
No light
output Wrong lamp installed Replace the lamp with
ADC part #5211-4
Batteries are depleted Replace with fresh “C” batteries
Accessories do not attach Accessories may have Obtain replacement
securely or operate properly reached end of useful life accessories
Instrument head will Thread/connection Service
not connect is damaged required
Lamp near end of Replace the lamp with
Dim light useful life ADC part #5211-4
output
Batteries are depleted Replace with fresh “C” batteries
Visible corrosion on Damage from excessive Service
instrument moisture required
Environment
Transportation / Storage: -4°F to 120.2°F (-20°C to +49°C)
RH 95 %
500 hpa – 1060 hpa, Altitude
Environmental Operating Range: 50°F to 120.2°F (10°C to 49°C)
RH 95 % (Max)
500 hpa – 1060 hpa, Altitude
Maximum Operating Temperature: 95°F (35°C)
Symbols
Attention: Read Operating Manual for Cautions and Instructions for Use
.
Attention: This is NOT an AP or APG apparatus.
TYPE B. Indicates this is a product with Type B applied parts.