TSRM/MK2 Supra/Repair Manual
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p.110

BE/Body Electrical System — Clock Troubleshooting, page 111

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p.112
Clock Troubleshooting — MK2 Supra Body Electrical System, page 111
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Page text (OCR transcript)
CLOCK
Troubleshooting
CLOCK WILL NOT OPERATE

Check to see if fuse is blown.
↓
OK
↓
Check to see if clock adjusting knob is binding in position and has failed to return.
↓
OK
↓
Check to see if battery voltage is over 11V with no load.
↓
OK
↓
Check to see if connector on clock side is loose or rusted.
↓
OK
↓
Check to see if there is voltage at terminal B or connector or clock side.
↓
OK
↓
Check to see if clock ground wire is loose or rusted.
↓
OK
↓
Replace clock.

Blown fuse → Locate trouble and repair or replace fuse as necessary.

Adjusting knob not returned → Repair if necessary or replace clock.

Below 11V → Recharge or replace battery.

Loose or rusted → Repair

No voltage → Locate cause and repair.

Loose or rusted → Repair


CLOCK LOSES OR GAINS TIME

Check amount of time the clock loses or gains per day or a week against the allowable error table.
↓
Exceeds allowable error
↓
Check to see if there is 11V—15V on terminal B of connector on clock side.
↓
OK
↓
Adjust or replace clock.

Below 11V → Locate cause and repair, or recharge battery.