Fisher X 101 D Schematic

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.