Lexicon LXP-5 Service Manual

LXP-5 Service Manual
Performance
Verification
Procedure
1. Apply a 1 kHz signal at -25dBV (159mVp/p) to left channel input for Left
Channel connection, or to right channel input for Right Channel connec¬
tion.
2 . With an oscilloscope set to DC coupling, 2v/division sensitivity at 5mS/
division sweep rate, trace audio signal as follows. Observe any exces¬
sive DC offset levels on any input or output stage, as this could indicate
a supply or amp problem which would affect the audio signal.
3. Set Mix control fully counter clockwise.
Sianal Level
Left Channel
Right Channel
Left channel output (pin 7)
4.8Vp/p
(4.6 - 5.OVp/p)
No Signal
Right channel output (pin 1)
No Signal
4.8Vp/p
(4.6 - 5.OVp/p)
4. Turn Input Level Control fully counter clockwise
Sinnal Level
Left Channel Right Channel
Left channel input (pin 5)
No Signal
No Signal
Right channel input (pin 3)
No Signal
No Signal
5. Set Input Level fully clockwise
---—-Signal I evel_
Input (pin 5) 1 .OVp/p (0.95 -1.05Vp/p)
Output (pin 7) 2.7Vp/p (2.6 - 2.8Vp/p)
Sianal Level
Hold Input (pin 2)
Virtual Ground (No Signal)
Hold Output (pin 6)
2.7Vp/p staircase waveform
(2.6 - 2.8Vp/p)
Sianal Level
Input (pin 3)
2.7Vp/p staircase waveform
(2.6 - 2.8Vp/p)
_Signal Level
Right channel output (pin 1)
2.7Vp/p staircase waveform
(2.6 - 2.8Vp/p)
Left channel output (pin 7)
2.7Vp/p staircase waveform
(2.6 - 2.8Vp/p)
Analog Input Stage (U42)
Pre-emphasis Stage (U40)
Input Hold Stage (U39)
Comparator (U32)
Output Hold Stage (U37)
2-13

Lexicon LXP-5 Specifications

General

Brand	Lexicon
Model	LXP-5
Category	Recording Equipment
Language	English