Subassembly Kepiacement
VOLTS JUMPERS POWER FUSE RATING 100VAC 1-4,3-5 2&5 2.5A Slow Blow
120VAC 1-4,3-5 1&5 2.5A Slow Blow 220VAC 3-4 2&5 1.25A Slow Blow 240VAC 3-4 1&5 1.25A Slow Blow
Table 6-4 Primary Power Connections
6.4.1 AC Line Fuse
Figure 6-2
ruSE HOWffi
~ D
~
AC Plug and Fuse Holder
Qualstar Corporation
1260 Technical Service Manual
6-6
The AC line fuse is located in the power plug receptacle as shown in Figure 6-2.
• To remove the fuse, first remove the power cord from the tape drive. Then us-ing a small flat blade screwdriver, carefully pop the rectangular fuse holder out of the receptacle.
• To replace the fuse holder, insert it into the receptacle and press it in until it snaps into place.
FUSE QUALSTAR LlTTLEFUSE BUSSMAN
RATING PIN PIN PIN
2.5A 1.25A
626-0012-7 2180.25 626-0011-9 2181.25
GDC 2.5 GDC 1.25
Table 6-5 Primary (Line) Fuse for Model 1260
6.5 PCBA Replacement
6.5.1
This section describes the removal and installation of the PCBAs. Refer to Chapter 3 for theory of operation, and to Figure 6-1 on page 6-3 for PCBA identification.
Write/Controller PCBA (Assembly 500217-01-3)
The Write/Controller PCBA is the second largest PCBA in the drive and controls the motion of the tape and the writing of data on the tape. Viewed from the rear of an open drive, it is located on the right side and is mounted on the Power Supply PCBA.
Refer to Figure 6-3.
6.5.1.1 Required Tools
#2 Phillips screwdriver Diagonal cutters
6.5.1.2 Required Adjustments
If the Write/Controller PCBA is replaced, the Write Current adjustments described in Chapter 7 must be performed.
6.5.1.3 Removing the Write/Controller PCBA
1. Note the positions of jumpers WO through W13 if the PCBA is to be replaced.
2. Remove the ribbon cables attached to J1, J3, J4, J5, J6 and J8.
3. Cut away the two cable ties holding the write head cable to the bottom of the PCBA.
500244H
6.5.2
Chapter 6: Subassembly Replacement PCBA Replacement
TACHA -0 T~D
DO o
~
J5 G2-81=
~ Option Switches n 1:5IIIJ4
I ~g-
G1II -
TACHBo
~I
o
- G5 J8 (Power)
~
~ +5~~~
(Read) G8 -[ WRPWR-J1 (Interface)
,. Test point
aMounting screw location
R11~ . . . .
o
~----~O 1111111111 J6 (Write HeadConnector)Figure 6-3 Write/Controller Layout
4. Remove the six Phillips screws holding the PCBA to standoffs and remove thePCBA.
6.5.1.4 Reinstalling the Write/Controller PCBA
If the PCBA is being replaced, verify that jumpers WO through W13 are positioned as on the old PCBA. Most tape drives are set at the factory with the options shown in Sec-tion 6.3.4. The PROM located at U12 must contain the latest version of firmware. Use the PROM with latest (highest) version number from either the old or the new PCBA.
"V2.03" is an example of a version number. PROMs with a version of 2 or greater re-quire a crystal (at Yl) of6.144 MHz, while versions l.xx require a 5.12MHz crystal.
1. Set S 1 off.
2. Position the PCBA over the standoffs on the Power Supply PCBA and secure it using six Phillips screws.
3. Connect the ribbon cables to J3, J4, J5, J6 and J8.
4. Secure the power cable from J8 to the bottom of the PCBA using two cable ties.
Power Supply PCBA (Assembly 500207-01-4)
The Power Supply PCBA is located on the hinged chassis beneath the Write/Control-ler PCBA. The Power Supply PCBA provides power for all of the electrical assemblies and for the motors.
Qualstar Corporation
1260 Technical Service Manual
6-8
6.5.2.1 Required Tools
#2 Phillips screwdriver V4 inch nut driver Small pliers
6.5.2.2 Required Adjustments
After replacing the Power Supply PCBA, the +5 volt adjustment described in Chapter 7 must be performed.
6.5.2.3 Power Supply PCBA Removal
Caution!
1. Remove the Write/Controller PCBA as described in Section 6.5.1.
Use a suitable pair of pliers to disconnect the slide-on connectors from the PCBA. Do not remove the connectors by pulling on the wire.
2. Disconnect the wires from EIO through E13 at the top of the PCBA.
3. Disconnect the wires from EI through E7 on the left edge of the PCBA.
4. Unplug J4B, J9, J12, and JI9 along the left edge of the PCBA.
5. Disconnect the wires from E14 through E19 at the bottom of the PCBA.
6. Remove the six mounting Phillips screws from the outside of the chassis. This may require holding the four standoffs mounted on the PCBA so that they don't turn. Hold the hex nuts near the bottom of the PCBA with a 1/4 inch nut driver while unscrewing the screws on the outside of the chassis.
7. Remove the Power Supply PCBA from the drive.
Table 6-6 lists the power supply wiring for reference.
6.5.2.4 Power Supply Installation
Caution!
1. Install the PCBA with the six screws, four standoffs at the top and middle, and two hex nuts near the bottom. The two hinged standoffs must be in-stalled at the left of the PCBA so that they pivot to the left and right.
Do not pinch the primary power leads from the power trans-former.
2. Reconnect the wires at EI4 through E19 at the bottom of the PCBA.
3. Reconnect the wires to EI through E7 at the left edge of the PCBA.
4. Reconnect J4B, J9, J12, and J19.
5. Reconnect EIO through EI3 at the top of the PCBA.
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DANGER!
6.5.3
Chapter 6: Subassembly Replacement PCBA Replacement
CONNECTOR WIRE COLOR DESTINATION
El Orange Supply Motor
E2 Brown
E3 Red
E4 Blue Fans
E5 Red
E6 Blue
E7 Red
E8 Red Auxilliaryfans
(optional)
E9 Blue
ElO Green with stripe Chassis ground
Ell Orange Take up Motor
El2 Brown
El3 Red
El4 Orange Transformer
El5 Red
El6 Black
El7 Yellow
El8 White
El9 violet
J9 White Cable ReadiFormatter power
Jl9 White Cable Write/Control power
Table 6-6 Power Supply Wiring
THE GREEN WIRE CONNECTS TO E10 ONLY. IF THE TERMINAL IS CONNECTED TO TEST POINT IIITUM"
WHICH IS ADJACENT TO E10, SEVERE DAMAGE CAN