You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
Click here to find out how to win free radios from Retevis!
Service Manual
Pages 1 to 33
Pages 34 to 66
Diagrams
Main Schematic Diagram PDF version
Main Schematic Diagram
CPU Schematic Diagram PDF version
CPU Schematic Diagram
Main Component Layout
CPU PCB Layout Top View UT550C/PB148AA
CPU PCB Layout Bottom View
Chassis Wiring Diagram Page 1...
Service Manual
Page 1 to 28
Page 29 to 52
RADIO MODIFICATIONS
Rogerbirds HR2510 Mod Site
ALIGNMENT PROCEDURES
PLL Alignment
Transmitter Alignment
Receiver Alignment
DIAGRAMS/HR2510
Schematic Diagram (Page 1)
Schematic Diagram (Page 2)
CPU Schematic
PARTS LAYOUTS
Main Board Layout...
Diagrams
Schematic Diagram PDF version
Schematic Diagram
Main PCB Layout PDF version
Alignment (Courtesy of David at DTB Radio)
RX Frequency
Set for channel 20
Connect freq counter to TP3, located on left side of radio between L14 and L36. It is a bare resistor lead.
AM adjust L15 for...
Service Manual
Pages 1 to 19
Pages 20 to 42
Diagrams
Schematic Diagram PDF version
Schematic Diagram
Chassis Wiring Diagram
LED PCB Layout
Main PCB Layout
This forum does not allow a single user to have more than one username. If anyone wants to change their username contact an admin and it will be done. Multiple accounts belonging to the same member will be deleted without warning.