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HX-Z1
4.6.3 Electrical Performance
Items
Measurement conditions
Adjustment of
• Mode: Forward or reverse
recording
mode
bias
• Recording mode
current
• Test tape
(Reference
: AC-514 to TYPE 2
Value)
and AC-225 to
TYPE1
Measurement output
terminal
: Both recording and head-
phone terminals
Adjustment of
Reference frequency
recording and
: 1kHz and 10kHz
playback
(REF.: -20dB)
frequency
Test tape
characteris-
: AC-514 to TYPE 2
tics
Measurement input terminal
: OSC IN
4.6.4 Reference Values for Electrical Function Confirmation Items
Items
Measurement conditions
Recording
Forward or reverse
bias
• Recording mode
frequency
: TYPE 2(AC-514)
• Measurement
terminal : BIAS TP on
P.C. board
Eraser
Forward or reverse
current
• Recording mode
(Reference
• Test tape
value)
: AC-514 to TYPE 2
and AC-225 to
TYPE 1
terminal : Both of the
eraser head terminals
30
Measurement method
(1) With the recording and playback mechanism,
load the test tapes (AC-514 to TYPE 2 and AC-
225 to TYPE 1), and set the mechanism to the
recording and pausing condition in advance.
(2) After connecting 100OHM in series to the re-
corder head, measure the bias current with a
valve voltmeter at both of the terminals.
(3) After resetting the [PAUSE] mode, start record-
ing. At this time, adjust VR31 for Lch and VR32
for Rch so that the recording bias current val-
ues become 4.0µA (TYPE 1) and 4.20µA
(TYPE 2).
(1) With the recording and playback mechanism,
load the test tapes (AC-514 to TYPE 2), and set
the mechanism to the recording and pausing
condition in advance.
(2) While repetitively inputting the reference fre-
quency signal of 1kHz and 10kHz from OSC IN,
record and playback the rape.
(3) While recording and playback the test tape in
TYPE 2, adjust VR31 for Lch and VR32 for Rch
so that the output deviation between 1kHz and
10kHz becomes
-1dB 2dB.
Measurement method
(1) While changing over to and from BIAS 1 and 2,
confirm that the frequency is changed.
(2) With the recording and playback mechanism,
load the test tape.
(AC-514 to TYPE 2), and set the mechanism to
the recording and pausing condition in ad-
vance.
(3) Confirm that the BIAS TP frequency on the
P.C. board is 100kHz 6kHz.
(1) While recording and playback mechanism,
load the test tapes (AC-514 to TYPE 2 and AC-
225 to TYPE 1), and set the mechanism to the
recording and pausing conditions in advance.
(2) After setting to the recording conditions, con-
nect 1W in series to the eraser head on the re-
cording and playback mechanism side, and
measure the eraser current from both of the
eraser terminals.
Standard
Adjusting
Values
positions
AC-225
VR31
: 4.20 µA
AC-514
: 4.0 µA
Output
VR31
deviation
between
1kHz and
10kHz
: -1dB 2dB
Standard
Adjusting
Values
positions
100 kHz
6 kHz
TYPE 2
: 120 mA
TYPE 1
: 75 mA
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