Service manual

C762, C764, C764i Stairclimber

Page 30

Procedure 6.3 - Upper Display Does Not Illuminate

Warning

Hazardous voltages will be tested in the following procedure. Exercise extreme caution when

performing these procedures. Do not connect or disconnect any wiring, connectors or other

components with power applied to the treadmill.

1. Disconnect the line cord from the AC wall outlet. Using an AC voltmeter, verify that the

proper AC voltage is present at the wall outlet. Nominal 120 Vac may vary between

approximately 105 Vac and 135 Vac. Nominal 240 Vac may vary between approximately

195 Vac and 245 Vac. If the AC voltage is missing or incorrect, check the AC service or

consult an electrician.

2. Set the circuit breaker in the “off” position. Plug the treadmill’s AC line cord into the AC wall

outlet. Using an AC voltmeter, check the line cord between the blue and brown wires for the

appropriate AC voltage (as tested in step 1). If the AC voltage is missing or incorrect,

replace the line cord.

3. Set the circuit breaker in the “on” position. Using an AC voltmeter, check between the AC

input terminals of the line filter. The AC voltage should read as in step 1. If the AC voltage is

missing or incorrect, replace the circuit breaker or the wiring between the circuit breaker and

line filter as appropriate.

4. Using an AC voltmeter, check between the AC input terminals of the lower PCA (terminals 1

& 2 of P4). The AC voltage should read as in step 1. If the AC voltage is missing or incorrect,

replace the line filter or the wiring between the circuit breaker an lower PCA, as appropriate.

5. Remove the fuse from the lower PCA. Using an ohmmeter, check the fuse for continuity. It

should read 1Ω or less. If the fuse is open or reads significantly higher than 1Ω replace the

fuse. If the upper display still does not illuminate continue with the next step.

6. Using an AC voltmeter, measure between terminal 4 (White) and terminal 7 (Blue) of P3.

The AC voltage should read as in step 1. If the AC voltage is missing or incorrect, replace

the lower PCA.

7. Using an AC voltmeter, measure between terminal 5 (Green) and terminal 6 (Yellow) of P3.

The AC voltage should read approximately 12 Vac. If the voltage is missing or incorrect,

replace the transformer.

8. Using an AC voltmeter, measure between terminal 1 (Red) and terminal 2 (Black) of P3. The

AC voltage should read approximately 6 Vac. If the voltage is missing or incorrect, replace

the transformer.