Panasonic RX-C300 - Page 7

3 YG. Oz 10) 0am 2D, O01 010)
& SEPARATION ALIGNMENT
FM SIGNAL
GENERATOR
SOURCE
CONNECTION
EQUIPMENT
CONNECTION
ELECTRONIC
COUNTER
ADJUSTMENT SPECIFICATION REMARKS
98 MHz, 60 dB (CW)
Connect to test point
W through FM dummy
antenna.
Negative side to test
point Y.
Adjust VR1, for 19 kHz
(+150 Hz) reading on electronics
counter.
Adjustment
of pilot
signal
@ AUDIO ADJUSTMENT
MEASUREMENT
ITEM INPUT POINT
ADJUSTMENT
SPECIFICATION POINT REMARKS
QZZCAC : ;
: Maximum Azimuth screw Playback mode
(1) a 20 ne} EXT SP (Refer to Fig. 2.) | (FWD and REV Playback)
WY... (Reh) Playback mode
mij genase aia dB) VY. (ich) 410+25 mV Me tee Tape switch ... Normal
, W... (-) Dolby NR ... OUT
Record mode
(3) Ese nn ¥: 2 180" 43 mV VR302 Beat proof switch— II
: dil Tape switch— Metal
; Use normal WY... (Leh) Normal 4.8 +0.2 mV Record mode
Bias VR101 (Lch) :
(4) and metal WY... (Reh) Beat proof switch II
current tape. W.(-) Metal 8.341.5mV | VR201 (Roh) Tape switch— Normal— Metal
1. Apply a —24 dB 1 KHz signal
from the line input terminal.
2. Measure the output voltage
of line output terminals.
3. Then, with the unit in the
record mode and,record the signal
Line IN VR102 (Lch) 4. Playback the recorded part,
(5) f=1 kHz, Output voltage VR202 (Reh) and measure the output
—24dB ...0+1 dB voltage of line output
terminals.
5. Compare the output voltage
measured in items 2 and 4,
and adjust so there is no
difference in the level.
(Adjust to obtain 0+1 dB.)
REMARKS
Use
oscilloscope.
Overall gain Line OUT
@ SPECTRUM ANALYZER ADJUSTMENT
MEASUREMENT
ITEM INPUT POINT ADJUSTMENT
1C204—Pin @ to @...(+)
CS2—Pin @...(—)
SPECIFICATION
less than +0.05 V
need adjustment —___
Limit voltage
adjustment
Do not supply
any audio signal.
need adjustment~
Total level ‘ snl Set graphic
fats
Line
In
Total
level
indicator
The
red
segments
are
not
:
indicator = : VR602 es equalizer to
adjustment ec AN [vee | Rarorneeas center.
@ TAPE SPEED ADJUSTMENT
COUNTER
Connect to earphone jack
ADJUSTMENT
1. Play back test tape (QZZCWAT, 3 kHz).
2. Adjust VR until 3000 Hz+90 Hz is read on the counter.
CAUTION (Refer to Fig. 9.)
Observe the following precautions when connecting a measuring device other than the accompanying speaker to an external speaker jack or a P.C.
Board.
Note:
When connecting an external measuring device to an output line, connect an electrolytic capacitor between them to cut the direct current. Also, the
positive (+) and negative (—) terminals of the left and right channels must be connected independently with respect to direct current and alternating
current. Be particularly careful that measuring devices connected to different channels and placed in close proximity to each other do not contact
each other.
Hf =
@ ALIGNMENT POINT
@Please refer to Circuit Boards and Wiring Connection Diagram which is located test point.
Total level indicator
R/P Head
FWD REV
Fig. 2
&)
Tape speed TAPE PHONO LINE. FM MODE FM AM
Ao 6P
Fig. 3 Fig. 4
é teat Overall gain
verall gain [VR202]
VRIO2
Bias current iQ)
VRIOI Bias current
e VR20l Fig. 6
Playback level Playback level
VRIOO VR200
Erase current Total level
Fig. 5
Output terminals of set
35 V 2200 x2
35 V 2200 ux2
+--+
AM IFT
455kHz
Fig. 7
Fig. 8
Oscilloscope
(Example of connection of external measuring devices)
Fig. 9
Vv Be sure to fold at the (V) mark so that mark is on the outside.
= 3
35 V 2200 ux2
AM ANT
SSOkHz
AMOSC
1650kHz
AM ANT
Limit voltage
VR6OO