11
To replace the input module, set the power switch to OFF and
disconnect the AC mains. Locate the input module as shown
in the diagram below. Remove the four sheet metal screws
from the corners of the input module’s front plate. Carefully
disconnect the 20-pin connector from P101. Attach the 20-
pin connector to the new input module. Insert the new input
module, being careful to avoid pinching the internal ribbon
cables between the circuit boards and the metal shielding inside
the amp. Re-attach the four sheet metal screws. Do not remove
the top cover.
REPLACING INPUT MODULES
Input Module
Connector P101
NO SOUND, NO POWER
This is usually an indication of a power supply problem in either
the power line itself or the amplifier’s power supply. Check the
following:
1) ZR Series amplifier’s power is switched off.
2) Line cord is disconnected.
3) Poor fit between the plug and AC receptacle.
4) Power off at AC receptacle (check with tester or lamp).
5) The amplifier is plugged into a switched outlet. Verify that
the outlet is live.
6) ZR Series amplifier’s mains fuse has blown. This amplifier
contains no user serviceable fuses inside the chassis.
POWER ON, LOW OUTPUT OR NO OUTPUT
Low or no output problems are usually signal-source, bad cable
or partial output short circuit related.
1) The input level sensitivity controls are set too low.
2) Move the input connection to another amplifier that you
know is working to verify that it is not a source problem.
3) Check speaker connections. Be sure that there are no small
strands of wire touching similar strands coming from the other
wire in the cable.
4) Make sure the speakers are functioning correctly.
5) If you are using bridged-mono mode, ensure that the Input
and Output configurations are set correctly.
6) Use a voltmeter to determine if the power line voltage is
dropping excessively when the amplifier is driven hard.
7) The thermal breaker in the power transformer has opened.
Allow amplifier to cool and the breaker will reset itself.
PLAYBACK IS MIXED WITH HUM
1) Check or replace the connecting cables, between source
and amplifier’s input.
2) Make sure that each screw terminal connection is tight.
3) Signal cables may have been routed too closely to the AC
cables, power transformers, motors or EMI inducing device.
4) Try connecting another source to the power amplifier inputs.
If the hum stops, the problem lies with the original source
component.
DISTORTION
Distortion is usually caused by excessive loss in the input
controls (the mixer/equalizer/crossover cannot produce enough
output), overdriving resulting in output clipping, or current
limiting caused by excessively low load impedance.
1) Check the setting of the input level sensitivity controls. If
set too high, the preceding piece of equipment may overdrive
the input stage.
2) Check the speaker connections and verify that all screw
connections are tight and that there are no stray strands of wire
to cause short circuits.
TROUBLE SHOOTING
If you are having trouble, or suspect a problem with your ZR Series amplifier, try some simple troubleshooting before contacting
an Authorized Carver Professional Dealer, Authorized Carver Professional Service Center or Carver Professional Technical Service.
Below are listed some general problems and items that should be checked in an attempt to resolve the difficulty.
INSTALLATION & CONNECTIONS
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