Maintenance Guide: Value Radar Speed Signs

Maintenance Guide: Value Radar Speed Signs

Models Covered:

• M75-009SE-xxxx
• M75-012SE-xxxx

This guide provides troubleshooting, voltage testing, LED indicator behavior, solar/battery diagnostics, and wiring reference information for Value SE radar speed signs.

Section 1 — LED Status Indicators

The sign includes 5 LED diagnostic indicators located on the front display board. These LEDs are used to determine operating state, standby mode, low-power conditions, and remote-control status.

LED #5 — System Status LED

This is the lowest LED on the 5-LED vertical indicator row.

LED5 Behavior & Meaning

• OFF → No power / very low power
• Blink every 15 seconds → Standby Mode (STDBY)
  • Sign will NOT detect traffic
  • Sign will NOT display speeds
• Blink every 1 second → Normal Operation
  • Sign is ON
  • System will respond to traffic

If LED5 is ON or blinking once per second, the sign is functioning and can continue normal setup.

Section 2 — Entering and Exiting Standby Mode

If LED5 blinks every 10–15 seconds, the sign is in STDBY mode.

The sign enters standby for two reasons:

1. User-Initiated via Remote

Someone used the remote and placed the sign into standby.

Fix:

• Open remote
• Press and hold Setup until the LED stays lit
• Press Sign
• Enter 1221
• Remote will exit standby

2. Low Voltage Event (< 11.8V)

The sign will automatically enter STDBY when voltage is too low to operate.

The sign will not exit STDBY until voltage has recovered.

Section 3 — Power Requirements & Low-Voltage Behavior

Value SE signs require 12.5V or greater to fully recover from low-voltage states.

Voltage Levels & Symptoms

Voltage Recovery

Section 4 — Voltage Testing Locations

There are three places to check voltage:

1. Battery Pack
2. Terminal Block inside Access Panel
3. Solar Panel Access Panel

Battery Voltage Expectations

• Should read 12–14.5V depending on charge state.
• Purple wire to black wire inside the access panel reflects battery level.
• Testing directly at the battery pack requires opening the pack and placing meter leads on the connector.
• 

If voltage at the access panel is ≥ 12.8V and wiring is correct, the sign should operate normally.

Section 5 — Solar Panel Charging System

Normal Solar Panel Output

• 18–21VDC in full sun
• Measured at solar access panel OR sign access terminal block
• 

MPPT Charging Behavior

• Below 13.4V battery → charger activates
• Above 13.4V → system regulates between 14.3–14.7V for optimized battery life

Why Battery Voltage Might Be Low

1. Solar Panel Issue
   • 8V or less indicates wiring damage or panel failure
   • Check solar access panel
2. Battery Pack Failure
3. Charge Circuit Issue

Section 6 — Common Troubleshooting Scenarios

1. Sign Has No Power or LEDs

Check in this order:

1. Solar panel polarity & connection
2. Purple wire alignment (misalignment = battery unplugged)
3. Solar voltage 17–23V and battery voltage 12.5–14.5V

If solar and battery are good but LEDs remain off → control board likely failed.

2. Sign Only Blinks LED #1 (top LED)

This indicates:

• Battery is disconnected
• Sign is attempting to run on solar only
• Solar output is insufficient to power system under load

Fix:

Check purple wire → verify battery voltage.

3. Sign Enters Standby Repeatedly

• Open access panel
• Verify purple wire alignment
• Measure battery voltage
• Measure solar input (red lead on solar+, black on solar–)

4. Sign Does Not Display Speed

Possible causes:

• Radar squelch setting too high
• Display failure
• Low voltage recovery incomplete

Fix:

• Use remote
• Try navigating menus
• Ensure squelch = 20
• If menus display but speed does not → display board likely failed

Section 7 — Wiring Reference

Your sign wiring includes the following key components:

• Battery 13.2V Module
• 013-009SE / 013-012SE Display Boards
• Access Panel Terminal Block
  • Battery ON/OFF
  • Solar Input
  • DC Common
• Purple Alignment Wire
  • MUST be aligned for the sign to power from battery
  • Misalignment = battery disconnected

Section 8 — Remote Control Setup

Basic Remote Functions

Setup Procedure

1. Hold Setup until LED stays lit
2. Press Sign
3. Enter 1221
4. LED goes out → remote paired and ready

Remote Emulator

An online simulator is available for training techs on LED indicators and menus. (Link to simulator)

Any button press illuminates the remote’s LED indicator.