McIntosh MPI 4 Service Manual

Page 2

'MPI-4

MULTIPATH MODE OF OPERATION
Sensitivity: IOOmV/cm
Frequency Response: DC to SOkHZ (-ZdB)
Input Impedance: 250kfl
Signal Strength Polarity: Selectable
positive or negative
STEREO MODE OF OPERATlON

,Sensitivity - L (Vertical Amp.): l.75mV
rms/cm (SmV P-P/cm)

- R (Horizontal Amp.): l.75mv
rms/cm (SmV P-P/cm)

Frequency Response: 5H2 to 50kHz (-BdB)

Input Impedance: ZSOkQ

POWER LEVEL MODE OF OPERATION

Sensitivity: O.l to IOOO average watts for
Full scale indication (+3dB)
In 9 calibrated steps.

Frequency Response: 5H2 to IDOkHz (-SdB)

Input Impedance: 7Skfl

Calibration: For bridging h, 8 or l6 ohm
speaker loads

PREAMP LEVEL MODE OF OPERATION

Sensitivity: lSmV rms for +3dB
indication

Frequency Response: 5H2 to 50kHz

Input Impedance: ZSOkQ

SWEEP MODE OF OPERATION

Display modes: Left, right, or both
(dual trace)

Sensitivity: l.6mV rms/cm (h.5mV P-P/cm)
Frequency Response: 5H2 to SOkHz (-3dB)
Input Impedance: ZSOkn

Sweep Frequency: 20Hz to ZOkHz in 3
Decade ranges

Sweep Expansion: .25X to 5X

Sweep Trigger: The sweep is triggered only
in the presence of an input signal.

In the single trace mode it
is triggered by the displayed wave-
Form.

In the dual trace mode the
trigger is selectable: Left channel,
right channel, or line Frequency.

PERFORMANCE LIMITS

LEVEL INDICATION MODE

Normal: ZSUUS rise time
SOOms tell time

Peak: ZSOps rise time
IOO sec fall time

Manual reset

LOW PASS FILTER
lékHz L. P. Filter for stereo and sweep modes

l9kHz and 38kHz rejected by at least 30dE

RETICLE LIGHTING

Selectable: On-Off

CRT
3 inch round tube, calibrated S x 6cm
lkV accelerating potential
Automatic intensity Control: In the absence

of a horizontal signal, the intensity
is reduced to prevent phosphor damage.

SEMICONDUCTOR COMPLEMENT:
2 integrated circuits
23 Transistors
l0 Light emitting diodes

29 Diodes

POWER SUPPLIES

All are regulated to give equivalent perform-
ance For line voltages of IOO to l35 VOIES.

POWER REQUIREMENTS
IZO volts SO/6OHz 50 watts

SIZE
Front panel I6 inches (h0.65cm) wide by
S-7/I6 (I3. cm) high. Chassis, l5 inches
(38.Icm) wide by 5 inches (l2.7cm) high
by l3 inches (33.lcm) deep. Knob clear-
ance required, l-i/Z inches (3.85cm) in
front of mounting panel.

WEIGHT

2| pounds (9.55kg) Net, 33 pounds (ISkg)
shipping.