Yaesu FT-901DM Maintenance Service Manual page 2

(Page)
SPECIFICATIONS
RECOMMENDED ACCESSORIES
CONTROLS AND
SWITCHES .......... 2220s eee e cece cere cere e teen eee e eee eeeneee
REAR
APRON CONNECTIONS
...........---
2c eee reece eet
eee e eee e eee eees
INTERCONNECTION DIAGRAMS
INSTALLATION
(0): 150. U1 (9), pa Se
caer
ee
eI
MICROPHONE CONNECTIONS
SECTION 2 — TECHNICAL NOTES
PARTS DESIGNATIONS ON CIRCUIT BOARDS
SIGNAL TRACING
IN THE FT-901 ........-..2.
0s eee cece erect ete eee e eee eee d
AUGMENTED
BLOCK
DIAGRAMS
...........-00
0 eee ee rere eter e reer eee e ee eennees 2-3
FREQUENCY
RELATIONS/CRYSTAL
DATA
...... 0.0000 e cree sere erent eee e nee 2-10
THEORY OF OPERATION
COOLING FAN
SOLDERING
AND DESOLDERING
TECHNIQUE
3-10
CIRCUIT TRACE
REPAIR ... 2.2... 52 20 cc cece
cence eee
eee cee nee eeeas 3-11
MODIFICATIONS
VFO
DRIFT IN PRESENCE
OF NEARBY
VHF TRANSMITTER............+-+++ 3-13
MEMORY
UNIT HUM,
MR MODE ............06
25 eee cee eee eee teenies 3-14
COUNTER
UNIT CAPACITOR REVERSAL
.
:
3 3-15
POWER SUPPLY
PROTECTION .........- 2220020 cece ne cent teen e eee ne nee ee neers 3-16
KEY CLICK: MODIFICATION i. i::esoie 35 6 oceb5- tue dinvesasernie tye diarere ere erisiore ecb rei nige nek le 3-17
RECTIFIER
C UNIT MODIFICATION
...........
02 e cece eee e eee eee e eens 3-17
WWV/JJY FREQUENCY
CHANGE... ..........5
22-2 e eee eee cece cece cece eee ee 3-18
MOSFET CHANGES..........- 2