SelfTest
No preliminary steps are required before you begin this procedure. 1 Make sure the power is off. Load the paper. 2 Press and hold down the form-feed switch while you switch on the power. Release both switches. Note If you use a color ribbon, the test printout will alternate the colors of each line. The first part of the print shows the ROM revision number, the DIP switch settings, and whether either option card is installed. Next the printout shows lines of characters. Each line contains the...
Operation Panel
The operation panel consists of operating switches and indicator lights. The operating switches are the buttons with which you control the printer, and the indicator lights let you know what state the printer is in. Power Switch - The power switch turns the printer on and off. Select Switch - The select switch toggles the printer between a selected online and a deselected off-line state. If printing is in progress when the select switch is pressed, the printer finishes printing the current line...
Print Head
1 Lift the paper bail to its highest position. 2 Set the paper thickness lever to its widest setting. 3 Gently push and hold aside the white print head clamp release lever and slowly lift the print head straight out of the connector.
Carrier Assembly
Before you begin, remove the following Caution Review the ESD precautions in Bulletins Safety. Unhook the ribbon wire from both sides of the frame. Move the carrier assembly to the right so that the right edge of the carrier housing is lined up with the edge of the main board or the right edge of the platen. Lift the front edge of the carrier assembly and remove the carrier from the metal rail guide. 4 Using needlenose pliers, pry the metal finger toward the front of the printer.
Flexible Ribbon Cable
Before you begin, remove the following Caution Review the ESD precautions in Bulletins Safety. 1 Remove the ribbon cable from connector CN5 on the main board. 2 Move the carrier assembly toward the right side of the carrier until the assembly is lined up with the right edge of the board. Slightly lift up the front of the carrier assembly until you hear a snap. 4 Caution Do not force the flexible cable loose or you will damage the cable. Using a small screwdriver, gently turn the screwdriver...
Shims
Before you begin, remove the covers. Caution Review the ESD precautions in Bulletins Safety. Note This procedure covers the gap check, and the installation and removal of the shims. Note Before performing the following procedures on shims, check the cam washer on the left side of the carrier shaft to be sure the washer is in position. The flat part of the hole in the cam should face the front of the printer when you place the cam on the carrier shaft. Refer to Carrier Assembly in the Take Apart...
Firing Hammer
No preliminary steps are required before you begin this procedure. Caution Review the ESD precautions in Bulletins Safety. Note Perform the firing hammer adjustment only when you replace the carrier belt, carrier shaft, carrier motor, or main board. 1 Print a few lines of the capital letter H. 2 Check the printed letters for misalignment. 3 Note Change only one switch at a time. If the letters are misaligned, remove the covers. Using a small screwdriver, change the settings of DIP switches 2-5...
Drive Belt 1
Before you begin, remove the following Caution Review the ESD precautions in Bulletins Safety. 1 Loosen the adjustments screw. 2 Using a screwdriver, push the carrier pulley arm to the right. 3 Hold the pulley arm in position and tighten the adjustment screw.
Main Board
The main board is the heart of the printer. Besides handling the distribution of the voltages, it also handles all the logic that controls the printer. It is also the source of the drive signals for the print head. All sensor signals that affect the operation of the printer are fed to this board. The ROM IC1 0 chip has the start-up routines and several features such as character sets and self-test routines built in. The RAM IC9 is used in the transfer of data and acts as a buffer. When printing...
Ribbon Motor Drivers
This circuit is made up of transistors Q3, Q4, Q5, Q6 and Q.7. When turned on, the line feed motor signals from the gate array are supplied with more current in the drive circuit and sent out to the motor. The common return line is on Q7, which is turned on for each phase signal sent to the motor. These signals are sent through CN5. This circuit is used when the printer is turned on to keep the logic in a reset state until the voltages are up to correct values. Once the voltages are at the...