Nec AUT 8300E Service Manual

Page 2

DISASSEMBLY INSTRUCTIONS ALIGNMENT METHOD

A NOTE: In FM alignment, keep P205, 15-16 short-circuited and AFC turned OFF.
-- FM lF Alignment (Fig. 2)
Q (1) Function Switch : "FM

(2) Muting Switch : "OFF"

(3) MPX Filter Switch : "OFF"

(4) FM Mode Switch : AUTO

1. Selectivity Curve Alignment (To use IF Sweep Generator 8: Oscilloscope)

i e C
6 Alignment Point Alignment Method Signal Input Point Signal Output Point

Alignment to be done with weak input signal.

C1069P101-3 P117+>P104 -P(GND)
lFT T1 Save Height max., Symmetric
~r> c» TC5 0Shield case (GND) TP2 0P101- 2 (GND)

B
a»,
o"
.1
Example of Scope Wave Form
FM.Z
Top View Bottom View
Fig. 1 2. 8 curve alignment (Fig. 3) (To use IF Sweep Generator & Oscilloscope)
Alignment Point Alignment Method Signal Input Point Signal Output Point
Removing cabinet top and bottom cover. See Fig. 1. . _ . 9
1. Remove 4 cabinet screws (A) from left and right sides and lift off cabinet. T101 (A) To 3"? at optimal pornt 0f TC5 QShield case (GND) P101 P104 _ 6 (GND)
2. Remove seven bottom cover screws (C) and lift off bottom cover. linearity TP1 9P1D1 - 2 (GND)
Set pointerto O V of volt- . Each end of R119.
Removing front panel. See Fig. 1. T101 (A) meter. No srgnal Refer to Fig. 4.
1. Remove 5 screws (B) from chassis and lift off front panel.

Example of Scope Wave

Fig. 3

R119

E DC voltmeter of center-zero type

q p (for high input impedance)

Fig. 4