Maintenance ST500 Tach-Timer
© Stack Limited
52
Check wiring for a short between pin 8 and pin 2 (B–) of the 8-way
connector.
Driver button: ‘Show Peak Values’ function does not work.
‘Change display layer’ function does not work.
• Driver button faulty
Renew the Driver button
Disconnect the Driver button and short pins 1 and 4 together on the
connector ‘S1’ to the tacho. If the display changes, renew the Driver
button. Otherwise, check the wiring.
• Faulty switch wiring
Check the switch wiring for correct continuity
Pin 8 of the 8-way connector to pin 1 of the S1 connector should be
less than 1.0 ohm. Pin 1 of connector S1 to B– (chassis) should be
greater than 1M ohms.
Rotary Control button: ‘Enter Setup Mode’ does not work.
• Rotary Control faulty
Renew the Rotary Control
Disconnect the Rotary Control and short together Pins 3 and 4 on
the connector ‘RC’. If the display changes, renew the Rotary Control.
Otherwise, check the wiring.
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