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Table 5-2 DC Supply Voltages
Logic/Power Board
Voltage
Tolerance
Test Points
(V)
(V)
(Figure 5-1)
+5
±O.25
12-6
+12
±O.6
12-2
-12
±O.6
12-3
+24
±2.0
14-1,2,3
-24
±2.0
14-7,8,9
Note: All voltages measured with respect to ground.
5.2 DC SERVO TEST
1.
Disconnect power from terminal.
2.
Remove printer housing (Paragraph 6.2.1) and tape down cover interlock. Open rear door.
3.
Push carriage assembly to the extreme left and slip timing belt off dc motor pUlley.
4.
Disconnect P5 from logic and power board. Connect + 5 V to dc servo motor via pins 1 and
2 of P5 (filter capacitors C47, C48, C49, - provide a +5
V
source). Connect +5
V
to pin
I
(white wire) and ground to pin 2 (red wire). Apply power to terminal.
5.
Check output of encoder per Paragraph 5.3.
6.
Remove power from terminal. Connect channell of scope to pin 8 of E25 (MINUS L) and
channel 2 to pin 9 (PLUS L). Set up scope according to Figure 5-2.
7.
Apply power to terminal. Check that dc motor is turning in a counterclockwise direction as
viewed from the front of the terminal. (If the timing belt were on, the print head would be
driven to the left.) Check for the waveform shown in Figure 5-2a. With a dc voltmeter, check
servo amplifier output on pin 2 (red wire) of 15. The reading should be about +23 V.
8.
Reverse +5
V
connection to P5 by connecting ground to pin
I
(white wire) and +5
V
to pin
2 (red wire). The dc motor will turn in a clockwise direction. Change scope trigger source
from CHAN2 to CHAN I and check for the waveshape of Figure 5-2b. Check servo ampli-
fier dc output on pin 2 (red wire) of 15. The dc voltmeter should read about -23 V. Remove
power and reconnect
11p5.
9.
Remove scope leads. Slip timing belt onto dc motor pUlley. Close up lower rear panel and
install printer housing (Paragraph 6.2.2).
5-8
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