Ensurepass

QUESTION 51

Which THREE of the following are clues that may indicate a ‘no power’ condition? SELECT THREE

 

A. You do not hear a startup chime.

B. You cannot connect to the Internet.

C. You do not hear any fan or drive noise.

D. The cursor is frozen and the system is unresponsive.

E. The power button or power indicator does not light up at all.

 

Answer: A,C,E 

 

 

QUESTION 52

What step is required before upgrading the RAM in a Mac Pro (Early 2009)?

 

A. Remove the processor tray.

B. Remove the hard drive carriers.

C. Remove the front inlet fan assembly.

D. Remove the Optical Drive and Carrier.

 

Answer: A 

Open computer, lay it down with access side facing up, and remove: . Processor tray

 

 

QUESTION 53

The Mac Pro (Early 2009) has SMC functionality split between a primary SMC on the backplane board, and a secondary SMC on the processor board. What service issue should a technician be aware of when servicing the Mac Pro (Early 2009)?

 

A. SMC firmware must always match on both boards.

B. Three internal buttons must be pressed in order to reset both SMCs.

C. It is required to remove the memory riser card in order to reset the SMC.

D. Processor trays are interchangeable between similar Mac Pro (Early 2009) units.

 

Answer: A 

Since the SMC firmware is stored on both the backplane board and processor board, it is important that theversion of SMC firmware match on both boards.

 

 

QUESTION 54

A computer service technician says “I don’t use ESD precautions and have never had a problem.” What (if anything) is wrong with this statement?

 

A. Nothing is wrong with this statement.

B. ESD damage may not appear immediately.

C. ESD happens only to inexperienced technicians.

D. ESD damage is really not as bad as everyone thinks.

 

Answer: B 

ESD MYTHS

Some popular misconceptions:

Don’t use ESD precautions and have never had a problem.

How would you know? You may be damaging parts in ways that do not show up immediatelyvia

system performance or diagnostic routines. Apple has tested for ESD damage andconsistently

found that mishandling components and computers creates IC damage.

Don’t have time to be tied down with wrist straps and mats.

Mishandling components creates DOA parts that slow down repairs and drive

customerdissatisfaction. In addition, you can set up work areas using heel straps instead of

wriststraps. This leaves your hands free.

If Apple was really serious about ESD precautions, it would not tell customers to justtouch metal

before replacing DIY parts.

Customers replace far fewer parts than service technicians. Since it is difficult to traincustomers in the best ESD techniques, Apple asks them to practice a less effectiveprocedure that they can

readily do.

Only RAM and logic boards require ESD precautions. Everything else is shieldedNot true. Most

components have some circuitry. In addition, replacing a component such asa cable may require

handling many other components that contain ICs. It is far wiser to takeESD precautions whenever you have to open up a computer.

You do not have to be hardwired to ground to practice correct ESD precautions.

There are some products which claim to ground you without the use of direct connections toground. Such “wireless” solutions have not been proven. Use a grounded wrist strap or heelstrap. Those work.

 

 

QUESTION 55

You want to follow ESD prevention rules, but your work area is too small for you to be tethered with a wired wrist strap. What is one acceptable alternative solution to this issue?

 

A. Use a wireless wrist strap.

B. Use a grounded ESD heel strap.

C. Do not practice ESD prevention.

D. Work on the floor instead of a table.

 

Answer: B 

Mishandling components creates DOA parts that slow down repairs and drive customerdissatisfaction. In addition, you can set up work areas using heel straps instead of wriststraps. This leaves your hands free.

 

 

QUESTION 56

When you work at a customer site, you do not need to take any precautions to avoid ESD damage.

 

A. True

B. False

 

Answer: B 

IMPORTANT: When you work at a customer site, you must take the same precautions toavoid ESD damage.

 

 

QUESTION 57

ESD causes damage to circuits by ________.

 

A. slowing the circuit down

B. blasting a hole in the circuit

C. cooling the circuit too quickly

D. increasing the circuit’s clock speed

 

Answer: B 

ESD Risks The discharge of static electricity near active electronic systems can cause memorycorruption or temporary failures. It can cause irreparable damage to sensitive chips andprinted circuitry of electronic components. Such damage is basically a hole blasted in the integrated circuit by the ESD. It can be a verysmall hole but can result in hard-to-trace computer behaviors.

 

 

QUESTION 58

You are preparing to service a MacBook. To reduce the risk of damage from ESD, you clear the area of plastic, vinyl, or foamed polystyrene, and have static-shielding storage bags available for ESD-sensitive components. While you are working you should also remember to ________________ and _______________. SELECT TWO

 

A. ground yourself and the equipment you are working on

B. always place ESD-sensitive components on metal surfaces

C. discharge the display to protect the other ESD-sensitive components

D. handle any ESD-sensitive components by the connectors, rather than by the edges

E. ask other technicians to avoid touching you when you are working on ESD-sensitive components

 

Answer: A,E 

Before working on any circuit board or assembly containing ESD-sensitive circuits, groundyourself

and the equipment you are working on to an earth or building ground. Use agrounded conductive workbench mat and a grounding wrist strap, and ground the equipmentto the mat.

Do not touch anyone who is working on ESD-sensitive circuits or circuit boards of any kind. Ifyou

touch someone who is properly grounded, your “zap” or body charge may not cause anydamage,

but just to be safe, keep your own body charge away from other technicians.

 

 

QUESTION 59

You are about to replace a MacBook Air (13-inch, Late 2010) logic board. Which of the following is the most important step you should take immediately after removing the bottom case?

 

A. Remove the thermal module.

B. Install the battery cover.

C. Remove the hard drive.

D. Remove the battery.

 

Answer: B 

Warning: The battery contains several exposed, soft battery packs. Always attach thebattery cover immediately after removing the bottom case.

 

 

QUESTION 60

Which of the following scenarios would be most appropriate to use Apple Service Diagnostic?

 

A. You want to check a Mac for accidental damage.

B. You want to verify product functionality after a repair.

C. Your customer wants to run diagnostics on his Mac Pro.

D. You need to verify that all installed applications have been updated.

 

Answer: B 

Run all available OS Stand Alone tests. Assuming all tests pass, then go on to step e. If oneor more test modules fail, consult the ASD Test Results Guide to interpret the failureindication and troubleshoot the failure from that point. Be sure to re-run all tests again afterresolving the failure to ensure the root cause of the issue is resolved and no other issueshave appeared.

 

 

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