4. Troubleshooting Guide
PT series owner's manual
14
owner`s manual PT series © 1995 Zeck Audio
S y m p t o m
P r o b l e m
What to check
All LEDs dark
No power supply
- mains cord
- house fuses
- amplifier fuse (refer to qualified service)
- internal power supply
(refer to qualified service)
'Protect' LED remains red after turn-on
Output protection relay has been triggered - speaker cables for short circuits or
incorrect wiring
- MODE selector switch for correct setting
- amplifier temperature & air supply
- speakers & crossover networks for short
c i r c u i t s
- output stage (refer to qualified service)
No Sound
Signal LED lit ?
- speaker cables & speakers
Signal LED dark ?
- volume controls
- input cables & connectors
- preceding audio device
- PROTECT LED (see above)
- output stage (refer to qualified service)
NLR control remains lit for prolonged time
Amplifier is constantly limiting output
- input level
power to prevent distortion
- output load not less than 2 ohms
- speakers & crossovers
- output stage (refer to qualified service)
TCL control remains lit for prolonged time
Amplifier is constantly limiting output
- sufficient back panel clearance for air
power to prevent overheating
i n t a k e
- dirty heatsinks (refer to qualified service)
- cooling fans (refer to qualified service)
