•
•
•
•
•
•
Power Supply Assembly (AlAOl)
(2Card Power Supply) 12 And 20 Volt Supply (AlA02) (3 Card Power Supply) 5 Volt Supply (AlAO.3 ) (3 Card Power Supply)
Blower Motor (AlBMl) Run Triac (AIKl)
Deck Interlock Switch (AIS4)
Logic Chassis (A2)
• Control Panel Assembly {A3AOl)
• Power Amplifier Assembly (A3A04)
• Track Servo preamplifier (A3A05)
• Drive Belt
• Drive Motor and Brake Assemblies (A3DMI, A3HBI)
• Spindle Assembly
• Static Ground Spring
• Speed Transducer (A3LI)
• velocity Transducer (A3L2)
• Pack Cover Solenoid (A3L3)
• Rail Bracket Assembly
• Carriage and Coil Assembly
• Heads Loaded Switch (A3S2)
• Flex Lead Assembly
• Magnet Assembly
• Head Arm Assemblies
• Cable Assemblies (WI through W4, W6, Wll, W12)
42 VOLT SUPPLY/EMERGENCY RETRACT ASSEMBLY (A1A01) (3 CARD POWER SUPPLY)
The plus and minus 42 volt power supply, emergency retract as-sembly is illustrated in figure 3-35.
Adiustment;
There are no adjustments applicable to the 42 volt power sup-ply. If the output does not meet specification, repair or re-place the card.
"Removal-Replacement
There are no special procedures for removing the card. Simply remove the power supply cover and lift the card straight out of the power supply chassis.
2-98 83322150 W
Repair
Repair of the 42 volt power supply card consist of removing and replacing the electrical components in accordance with the
parts data information. In replacing resistors Rl and R2, use RTV adhesive sealant, or a suitable substitute, to cement the resistor body to the board blank.
POWER SUPPLY ASSEMBLY (A1AOll (2 CARD POWER SUPPLY)
The plus and minus 42, 20, and 12 volt power supply is illus-trated in figure 3-39.
Adjustment
There are no adjustments applicable to the 42, 20, and 12 volt power supply. The outputs should be 42 ±2 V, 20 ±2 V, and 12
±2 V. If any voltages are out of tolerance, replace the card.
Removal-Replacement
1. Remove protective cover assembly.
2. Unplug connectors from Jl, J2, and J3.
3. Remove four screws securing the power supply assembly to the base.
4. Lift the power supply assembly out of the drive
Repair
Repair of the power supply card consists of removing and re-placing the electrical components in accordance with the parts data information. When replacing the large capacitors be sure to secure them with a tie wrap. Use dielectric grease between the base of the transistor and the heat sink.
12 & 20 VOLT SUPPLY (A1A02) (3 CARD POWER SUPPLY)
The plus and minus 12 volt and plus and minus 20 volt power supply is illustrated in figure 3-36.
Adiustment
There are no adjustments applicable to the 12 and 20 volt power supply. If the output does not meet specification, repair or replace the card.
fle moval-Replace ment'
There are no special procedures for removing the card. Simply remove the power supply cover and lift the card straight out of the power supply chassis.
Repair
Repair of the 12 and 20 volt power supply consists of removing and replacing the electircal components in accordance with the parts data information. In replacing voltage regulator diodes VRI and VR2, apply a thin coat of dielectric grease between the base of the diode and the heatsink.
5 VOLT SUPPLY (A1A03) (3 CARD POWER SUPPLY)
The plus and minus 5 volt power supply is illustrated in figure 3-37.
Adiustment
Adjustment of the 5 volt power supply is covered in section 2C, Test and Adjustment.
Removal-Replacement
There are no special procedures for removing the card. Simply remove the power supply cover and lift the card straight out of the power supply chassis.
Repair
Repair of the 5 volt power supply consists of removing and re-placing the electrical components in accordance with the parts data information. In replacing resistor R20, use RTV adhesive sealant (or a suitable substitute) to cement the resistor body to the board blank. In replacing transistors Q4, Q9, and QlO, apply a thin coat of dielectric grease between the base of the transistor and the heatsink.
2-100 83322150 W
BLO'WER MOTOR ASSEMBLY (A1BM1)
The blower motor is illustrated in figures 3-32, and 3-33 (sheet 2).
Adjustment
There is no adjustment applicable to the blower motor.
Removal-Replacement
Removal and replacement of the blower motor assembly is accom-plished in accordance with the information in the parts data section. Before removing the blower motor, first remove the absolute filter and the logic chassis air plenum. If the
square shoulder grommets between the base and the blower motor are removed or need to be replaced, ensure that the wide shoul-der on the grommet is installed toward the blower. The foam tape gasket between the blower and the logic chassis air plenum is not part of the blower motor assembly. Refer to Repair for the replacement of the gasket.
Repair
Repair of the blower motor assembly is limited to the replace-ment of connectors, pins, quick connect terminals, insulating pods, and the foam gasket next to the logic chassis air ple-num. Refer to the paragraph on"cable assembly removal-replace-ment and repair for information concerning the electrical ter-minals. .
Gasket replacement requires approximately 305 to 330 mm (12 to 13 in) of foam tape. Proceed as follows:
NOTE
Use care not to damage gasket when installing logic chassis air plenum.
1. Cut two lengths of foam tape, each 140 mm (5-1/2 in) long.
2. Place logic chassis air plenum on base next to blower mo-tor and align holddown holes. Mark position of each end of plenum on blower motor with a pencil.
3. Remove backing from one 140 mm (5-1/2 in) length of tape to expose adhesive. position edge of tape against base
(to seal space under blower) and center around two