HP 81533B - Page 20

Note
When performing this test and the following tests, each time,
after pressing the switch on the head recognition adapter, the
message
ER 3200 HEAD-DAT appears. To continue the tests or to
repeat a test, the error state must be overwritten by pressing
any key on the HP
8153A front panel.
'1
b. Use the test cable to connect the + 5V receptacle to the oscilloscope.
c. Check that, when you press the switch on the head recognition adapter,
the
+ 5V output switches from OV to +5V and then back to OV after
approximately 2 seconds.
7. To test the data clock (see also the note to step 6):
a. Use the test cable to connect the CLOCK receptacle to the oscilloscope.
b. Check that, when you press the switch on the head recognition adapter,
the CLOCK outputs clock pulses for approximately 4 seconds, going from
+ 5V to OV.
8. To test the OE (see also the note to step 6):
a. Use the test cable to connect the
receptacle to the oscilloscope.
b. Check that, when you press the switch on the head recognition adapter,
the output switches from +5V to
OV and then back to +5V after
approximately 2 seconds.
9. To test the ONIOF'F' (see also the note to step 6):
a. Use the test cable to connect the ONIOFF receptacle to the oscilloscope.
b. Check that the ONIOF'F' output is at
+ 15V while you are pressing the
switch on the head recognition adapter, and at +5V when you release
the switch.
10.
To test the Peltier Control:
a. Change the input sensitivity of the oscilloscope to 0.05VIDIV and connect
the test cable from the P.CTRL receptacle to the oscilloscope.
b. Watch the DC level displayed on the oscilloscope and connect instead of
the head recognition adapter the HP 81520A, HP 81521B, HP 81524A, or
HP
81525A Optical Head.
c. After a few seconds, the P.CTRL voltage should change from
approximately 130rnV to approximately 30mV (HP 81520A), from
HP 81533B and Optical Heads Performance Tests 0.5
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