Fisher X 101 D Schematic
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Extracted text from Fisher X 101 D Schematic (Ocr-read)
Page 1
ADJUSTMENTS
Equipment Required: DC VTVM, Audio (AC) VTVM
|N\ Analyzer,
4-ohm, non-inductive load resistor
(minimum 25-watt rating)
'I - Bias Adiustment
a. Set Volume control to minimum.
b. Connect DC VTVM to Pin 5 of any
output tube (V7, V8, V9 or VlO).
c. Adiust Bias" control for 39.0 volts.
2 - Phase Inverter Adjustment
IMPORTANT: Note in the schematic that the C (common)
speaker terminals are not grounded - the 4-ohm terminals are
grounded. Never ground the C terminals either directly or
accidently through test equipment common ground leads.
Channel A
a. Connect a 4-ohm load between C and 4 left speaker terminals.
b. Connect lN\ Distortion Analyzer output to channel A AUX input.
c. Connect the Analyzer input ground lead to the left speaker
4«ohm terminal.
d. Connect the Analyzer input hot lead to the left speaker
C terminal
e. Set the Selector switch to AUX, the Mode switch to STEREO,
and adiust the Analyzer for 8.0 volts across the Aeohm load.
1. Adiust the CH A Phase Inverter control for minimum lM
distortion.
Channel B
(1. Connect a 4-ohm load between C and 4 right speaker terminals.
b. Connect lI\/\ Distortion Analyzer output to channel B AUX input.
c. Connect the Analyzer input ground lead to the right speaker
4-ohm terminal.
d. Connect the Analyzer input hot lead to the right speaker
C terminal.
e. Set the Selector switch to AUX, the Mode switch to STERO,
and adiust the Analyzer for 8.0 volts across the 4-ohm load.
1. Acliust the CH B Phase Inverter control for minimum lNl
distortion.