Location Of Functional Elements On Pcbas - Printronix p300 Maintenance Manual

Table 2–1. Location of Functional Elements on PCBAs
Logic A PCBA
Character Generation:
Character Column Prom
Character Proms
DB8 Generation Logic
Dot Column Proms
Serial Data Output to
Hammer Driver Board
Print Synchronization:
Hammer Clock Logic
Hammer Shift Clock
Logic
Interface:
Input Data Registers
Interface Receivers
Interface Transmitters
Internal Data Strobe Logic
Polarity Select Logic
Printable Character
Detection
Commands:
PI Generation Logic
Plot Mode Logic
Print Buffer:
Static RAM Memory
Static RAM Memory
Counter
Self–Test:
Self–Test Logic*
Control Decode Prom:
Special Logic Prom
*Available only with A2 and B5 or higher numbered logic PCBAs.
NOTE: XQ models must use A7 and B10 logic PCBAs; these boards are optional on
pedestal models. Pedestal models made after 1984 are usually equipped with A6 and B9 logic
PCBAs.
Hammer Driver PCBA
Transistor Drivers
Tri–state Output Interlock
Logic
Tri–state Shift Reg/Latch
P300/P600 Principles of Operation
Logic B PCBA
Print Synchronizsation:
MPU Sync Logic
Control Panel Logic:
On–line logic
Dot Row PROMS & Logic:
Dot Row PROMS & Logic
EVFU
Top of Form Logic:
Paper Feed PROM and
Logic
Top of Form Counter
Miscellaneous Logic:
Mode Control Flip–Flops
Paper Motion Fault Logic
Paper Out Delay Logic
Ready Logic
Resync Logic
Self–Test Logic
Shuttle 6 sec Timeout
Shuttle up to Speed Logic
System Clock (2MHz)
Self–Test*
Ribbon Control PCBA
Ribbon Motors Control
Circuits
Shuttle Motor Control
Circuits
Shuttle Fan Control
Circuits
Power Supply PCBA
+5V Regulator
Hammer Voltage:
+28V Regulator (P300)
+36V Regulator (P600)
–30V (P300 only)
Hammer Master Clear
MPU/Shaper/Amplifier
Paper Feed Motor
Drivers
Paper Motion Detector
PLL
Paper Out Monitor
+28V – Ribbon Servo
Motors
+70V – Paper Feed
Motor
(P600 only)
Hammer Reset Timer
PCBA
(P600 and P600XQ only)
Com Line Counter
Reset Timing Logic
2–3