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A-SSORX
5-6
DBX PCB ASSEMBL
5-6-1
CONNECTION
Low
distortion
AF OSCILLATOR
Distortion
factor
0.02%
or less
Y CHECKS
ATTENUATOR
TP3L
(TP3R)
TRAIL
TP2L
{TPIR)
BBX PCB
Term. 4 (2)
Term. #3 (12) = GND
NOTE:
the following:
#5-3, ITEM 2, 2nd
#5-5,
ITEM
13
#5-5,
ITEM
14
AC VOLTMETER
DISTORTION METER
If checks
in this section
are
conducted,
re-adjust
OSCILLOSCOPE
TA-1100
NOTE: L-ch (R-ch)
Fig. 5-7
5-6-2
DECODING
CHECKS
Check in the play mode without loading tape, and with NR SYSTEM
switch in OUT position.
ADJUST
MEASURING
STEP
SIGNAL
SOURCE
(or CHECK)
POINT
RESULT
REMARKS
(on DBX
PCB)
1 kH2z/—26.5 dB
1
(36.7 mV}
VR101/VR201
TPIL/TPIR
—2.5 dB (580-mV)
j—___}___—
——_—.
ee
eee
ne One oo
:
@® RMS SYM adj.
2
eee
VR104/VR204
TP3L/TP3R
ee ea
@ «1: 100 Hz x 2
;
p
© Refer Fig's 58 & 5-9
.
0.41 mV +1 dB (0.365 mv ~
3
100 Hz/—32 dB
Check
0.460 mv)
4
1 kHz/—32 dB
VR106/VR206
TP2L/TP2R
—8 dB(308 mV)
,
@VCA
SYM
adj.
5
Pi ea oe
VR102/VR202
(on isabel aeniake
Pa nina setmenie
(13.8 mV)
nie
gaa SSRORTLON
fundamental (1 kHz)
ese
® Refer Fig's 5-10 & 5-11
Min. distortion factor
6
1 kHz/—35 dB
Check
(0.1% or less)
1 kHz/—30 dB
-
Ciean 3 kHz sine-wave
(#2) (on
@ EM adj.
f
(24.5 mV)
VR103/VR203
'scope thru distortion meter)
@ Refer Fig's 5-10 & 5-11
+
—
Min. distortion factor
8
1 kHz/—30 dB
Check
(0.1% or less)
9
Repeat steps 4 through 8 until the best result is gotton.
1 kHz/—32
dB
10
(19.5 mV)
VR106/VR206
TP2L/TP2R
—8 dB (308 mV)
Ref. 1
11
100 Hz/—32 dB
Check
[
"
—1 dB £1 dB varies from ref. 1
12
10 kHz/—32 dB
"
"
+9.4 dB +1 GB varies from ref. 1
43
1 kHz/—62 dB
,
7
—68 dB +1 dB
(615 UV)
(275 pV ~ 346 BV)
Sie ode
+12dB £1 dB (2.75 V~3.46 V)
14
"
"
and
(61.5 mV)
|
0.8% or less distortion
1 kHz/—82 dB
.
5
a
15
(61.5 LV)
90 dB (24.5 UV) or more
|
12
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