MFJ-9412 Instruction Manual
12-Meter SSB Transceiver
9
WARNING: The tune-up information provided in this manual does not
constitute a step-by-step guide for aligning the MFJ-9412. IF
YOU LACK THE TEST EQUIPMENT, KNOWLEDGE, AND
SKILLS TO ALIGN HF SSB TRANSCEIVERS, DO NOT
ATTEMPT TO MAKE THESE ADJUSTMENTS ON YOUR OWN!!
Far better to contact the MFJ factory for assistance. Mis-
alignment may cause permanent damage to your unit, and may
result in interference to other radio services in violation of
FCC rules. MFJ cannot be held responsible for the
performance of radios that have been improperly tampered
with or mis-adjusted by owners and users.
CARRIER
CARRIER
INSERT
L1
L2
T1
T2
T3
MIC GAIN
RSSI
V-REG
ZERO
PA OUTPUT
INPUT
PA
DRIVER
PRE-DRIVE
ALC
VFO CAL
MIXER
MXR OSC
VFT
VOL
VFO TUNE
KEY
TX
MIC
PWR
PWR
EXT AMP
PA BIAS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
17
16
BFO
TP
M
MXR FIL
BAL MOD
RX IF
RX/TX IF
RX RF
LEVEL
NULL
18
Note:
For trimpots, trimcaps, and IF cans (T1-T3), use a non-conductive tuning wand
with a metallic tip. For TOKO brand inductors, use a non-conductive wand with
a narrow plastic tip. For Coilcraft brand inductors, use a small hex-head non-
metallic tuning tool.
IN CASE OF DIFFICULTY
Radio does not power up:
Check power plug and power supply. Also, reverse-
polarity protection fuse may be open (etched on PC board in front of power jack J3). If
open, install a 3.0-A pig-tail replacement fuse or short length of #32 wire.
