SECTION 1 SPECIFICATIONS... 1 — 1 SECTION 2 INSIDE VIEWS... 2 — 1-2 SECTION 3 BLOCK DIAGRAM... 3 — 1 SECTION 4 CIRCUIT DESCRIPTION... 4 — 1-5 4 -1 Receiver CIRCUITS... 4—1 4-2 Transmitter CIRCUITS... 4 — 2 4-3 PLL CIRCUITS... 4 — 3 4-4 OTHER CIRCUIT... 4 — 4 4-5 CPU PORT ALLOCATIONS (LOGIC UNIT)... 4 — 5 SECTION 5 MECHANICAL PARTS AND DISASSEMBLY... 5 — 1- 3 5 -1 Transceiver 5—1 5 - 2 BATTERY PACKS... 5 — 3 SECTION 6 ADJUSTMENT PROCEDURES... 6 — 1- 4 6 -1 PREPARATION BEFORE SERVICING... 6—1 6-2 PLL ADJUSTMENT... 6 — 2 6 - 3 Receiver ADJUSTMENT... 6 — 3 6 - 4 Transmitter ADJUSTMENT ... 6 — 4 SECTION 7 BOARD LAYOUTS... 7 — 1- 9 7-1 LOGIC UNIT... 7—1 7 - 2 MAIN UNIT... 7 — 2 7-3 AF AND APC UNITS... 7 — 4 7-4 RF AND YGR UNITS... 7 — 5 7-5 PLL UNIT... 7 — 6 7-6 IF AND REG UNITS... 7 — 7 7-7 VOL AND MIC UNITS... 7 — 8 7-8 JCK AND CTCSS UNIT... 7 — 9 SECTION 8 PARTS LIST... 8 — 1-6 SECTION 9 VOLTAGE DIAGRAM ... 9 — 1 SECTION 10 UT-53 OPTIONAL UNIT... 10 — 1