Table of Contents
Advertisement
Vertical Format Unit (VFU)
10.
Replace bustle cover and secure in place.
11.
Replace Printer in case.
DETECTOR ADJUSTMENT
1.
Connect voltmeter to test point No. 10 on
TVFA PCB using home ground as reference. Use at
least a 20,000 ohms/volt voltmeter.
2.
Move the VFU detector assembly, using the
adjustment lever, toward the rear of Printer until volt·
meter indicates -12 to -15 Volts. Then move assembly
forward to point where voltage goes to zero. At this
point place a mark on the detector frame in line with
the front edge of the adjustment lever.
3.
Continue moving the detector assembly for-
ward to the point where the voltmeter again reads -12
to -15 Volts. Then place another mark on the front
edge of the lever.
4.
Move the adjustment lever toward the rear
of the Printer again until the front edge is past the first
mark. Then push the lever forward until the front
edge is midway between the two marks.
5.
lighten the detector assembly adjustment
screw. Make sure the assembly does not move from
the set position while the screw is being tightened.
CAUTION
DO NOT OVERTIGHTEN. Limit torque
on hex screw to 3 in. lb. Exceeding this
torque limit may break plastic.
TVFA PCB ADJUSTMENT
As may be seen on the TVFA Schematic Diagram
(Figure 8). the TVFA board includes either a Jl or a
J2 strap. All possible strapping arrangements are ex-
plained under PAPER TAPE VFU FILL CHARACTER
REQUIREMENTS on page 14.
In addition, again referring to Figure 8 and page 14,
note that the TVFA board contains a factory-adjusted
200K potentionmeter (R31). If necessary, this pot en-
tionmeter may be readjusted to obtain an 8.3 msec
pulse rate at board test point 3 to reduce fill character
requirements if the Printer does not have the TL signal
brought out from the motherboard and form length
does not exceed 11 inches (27.9 cm).
4
GEK-36143
OPERATION
INSERTING VFU PAPER TAPE
NOTE
Always use good quality opaque tape, with
ASCII specified spacing of sprocket holes.
1.
Lift Printer top cover to permit access to
VFU tape reader.
2.
Lift tape hold-down cover and install tape
over sprocket, ensuring that sprocket teeth engage
paper tape sprocket holes.
3.
Close Printer top cover.
4.
Turn Printer on and press Form Feed key
(button on RO units). This will advance paper tape to
next Form Feed position.
5.
Adjust form on platen to form position
I
•
per user s requirement.
DETERMINING LENGTH OF PAPER TAPE
1.
Refer to Table 1 to determine the paper
tape length.
2.
Because of a 6-inch (15.24 cm) minimum
tape length, short forms will require repetitive tape
. lengths.
3.
A suggested maximum tape length is 12
inches (30.5 cm).
NOTE
When making a punched paper tape pre-
pared in accordance with Figure 6, it should
be noted that there is no parity bit. There-
fore, if it is necessary to reproduce this tape,
the
tape
reproducing
equipment could
detect a parity error.
PREPAHING VFU PAPER TAPE ON AN ASR
PR INTER.
(See Figure 4 and Table 1)
1.
Turn Printer power on.
2.
Place Printer in LOCAL mode.
3.
Press RETURN key to reset Print Position
Indicator to "1".
Advertisement
Table of Contents
