Wang 5536 - Corrective Maintenance; General Maintenance

3402
5.2 CORRECTIVE MAINTENANCE
This section describes repair techniques for the 5536 workstation.
5.2.1 GENERAL MAINTENANCE
NOTE
The labeled test points are located at the top right
corner of the component side of PCA 210-7544/7744.
5.2.1.1 Power Supply Voltage Checks
Using a digital voltmeter, check the test points on PCA 210-7744 for +5 V,
-5 V, and +12 V (figure 5-1), and on PCA 210-7656 or the cinch connector
for -12 V (figure 5-2). Adjust the trimpots on regulator PCA 210-7656
(figure 5-2) if necessary: Use pin R for +OV reference. The power supply
voltages should be within the ranges:
Adjust Voltage Tolerances Ripple
RS
R35
Rl6
R24
+5V +4.9V to +5.lV 75mV p-p
-sv -4.9V to
-5.lV 75mV p-p
+12V +ll .8V to +12.2V
75mV p-p
-12V
-11.SV to -12.2v
75mV p-p
NOTE
Test point A is the heavy etch located at the upper end
(furthest from the board connector) of resistor R7 (33
ohm, lW).
Figure 5-1. 210-7744 Voltage Test Points
5-2
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