RK06/RK07 Disk Drive User's Manual - Trailing-Edge

4.4.1 Controller Power Supply Voltage Checks
To perform the required voltage checks on the controller power supply, set controller power to ON
and make measurements at the following points:
Test Point
A04A2
A04B2
A04C2
A04D2
Voltage
+5 Vdc ± 0.25 V
-15 Vdc ± 0.75 V
GND
+15Vdc±0.75
If any voltage is out of tolerance, refer to the appropriate expander box manual for adjustment and/or
repair procedures.
4.4.2 Disk Drive Power Supply V oltage Checks
To perform the required voltage checks on the disk drive power supply:
1. Ensure that the power cable is connected to a power outlet of the proper voltage and frequency
rating.
2. Ensure that the RUN/STOP switch is in the STOP position.
3. Set circuit breaker CB 1 to the ON position. The air system should start operating and the
lid-lock solenoid will energize to enable the lid.
4. Check the five output voltages at the logic backplane:
Backplane
Location
B08A2
DOIE2
C08D2
C08B2
A08R2
Voltage
+5Vdc±3%
+25 Vdc ± 10%
+15Vdc±5%
-15 Vdc ± 5%
-5Vdc±3%
If any voltage is not within tolerance, refer to the RK06/ RK07 Disk Subsystem Service Manual for
adjustment and/or repair procedures.
4.4.3 Head Load/Unload Checks
The following head load/unload checks are performed during the POWER ON sequence to ensure
that operational status can be attained:
1. With power ON, install a scratch cartridge into the drive.
2. Depress the appropriate access select switch, either A or B.
3. Press the R UN/STOP switch. After approximately one second, the spindle will begin to
rotate and the R UN/STOP light will extinguish.
NOTE
Power must be applied to the controller (or to the
Field Test Box, if used) during performance of the
load/unload checks.
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