JVC UX-A4 - 13. Electrical Parts

UX-A4 B/E/G/GI/EN |
Hi Tuner Section
Stem
|
Conditions
Adjustment
&
Confirmation
Methods
Stand.
values
|
Adjust
|
LW BF tracking Band select * Frequency of SSG :144kHz
check and adjust : LW * Number preset memory : Max. capacity( M6)
(All version) Tuner Input 1. Adjust L6 to obtain 1.1V + 0.02Vat TPS.
: Standard loop * Frequency range: 144 KHz
4 antenna * Receive 144 kHz(M6)
Measuring point 2. Receive 144kHz signal from an AM oscillator by
> TPS the set while adjusting L5to maximize headphone
output.
+ Frequency range : 288kHz
* Recieve 288 kHz(M7)
3. Receive 288 KHz signal from an AM oscillator by
the set while adjusting TC3 to maximize
headphone output.
. Repeat the above steps 2. and 3. to obtain
maximum outputs respectively.
1.4V + 0.02V
utput level
‘Maximum
TC3
L5, TC3
MW or AM RF
tracking check and
adjust
(All version))
FM RF tracking
check and adjust
(UX — A4 B)
FM RF tracking
check and adjust
(UX - A4E/G/
GI/ EN)
44 (No. 1890)
‘Band select
» AM or MW
Tuner Input
: Standard loop
antenna
- Band select
>FM
* Tuner input
: Dummy
antenna for
unbalanceed
75
: Positive side to
TP1
: Negative side
to TP2
. Receive 603 kHz signal ( preset No.3) from the AM} Output level
oscillator by the set while adjusting L3 to maximize
headphone output.
. Receive 1404 kHz signal from an AM oscillator by
the set while adjusting TC2 to maximize
headphone output.
. Repeat the above steps 1. and 2. to obtain
maximurn outputs respectively.
Receive 88 MHz signal ( preset No.3) from an FM
oscillator by the set while adjusting L2 to
maximize headphone output .
1. Adjust Lt to obtain 1.3 V + 0.02 V at TPS.
G/GI version use :1.0V + 0.02V.
2. Receive 88MHz signal from an FM oscillator by
the set while adjusting L2, L13 to maximize
headphone output.
3. Next, receive 106MHz signal while adjusting
TC1, TC4 to maximize headphone output.
4, Repeat the above steps 2. and 3. to obtain
maximum outputs respectively,
:maximum L3
TC2
L3, TC2
TC1,TO4
Output level
> maximum
1.3 +0.02V
G/G! version
>1.0= 0.62V