Panasonic SG-40 - Cassette Tape Deck Alignment; Bias Alignment Procedures; Azimuth, Dolby, and Rec Current Alignment; Alignment Test Points

aS
ALIGNMENT INSTRUCTIONS(CASSETTE TAPE DECK)
™ Cassete Tape Deck Alignment
BIAS ALIGNMENT
. Function
. Tape Deck Condition
. Dolby Switch
. Whistle Defeat Switch .... A
Control Positions:
Recording Condition
VTVM CONNECTION TAPE
T
Negative SELECTOR
ALIGNMENT
ITEM
REMARKS
ADJUST
Positive
* Adjust VR802 and VR803 center.
* Adjust VR801 to get 140 ~150 mV
reading on VTVM.
VR801
VR802
V R803
Erase Bias TP801 TP65
Recording Bias
TP401 (L ch)
TP402 (R ch)
NORMAL
V R802
* Adjust VR802 to get 3.6 mV reading
on VTVM.
(METAL: 85~9.5 mv)
* Adjust VR803 to get within 0.3 mV
TP401 (L ch)
nee
eee
difference
reading
on
both
VTVM.
* Repeat steps 1 & 2.
Recording Bias TP403 NORMAL V R803
TP402 (R ch)
AZIMUTH, DOLBY, REC CURRENT ALIGNMENT
Tape, AUX (Step 3)
Play Condition, Recording Condition (Step 3)
NORMAL
Control Positions: 1. Function
2. Tape Deck Condition
3. Tape Selector
VTVM CONNECTION DOLBY
SWITCH
TEST
TAPE
ALIGNMENT
ITEM
ADJUST REMARKS
Positive Negative
* Adjust screw for max. indication on
VTVM.
10 kHz,
-5 dB
Speaker
Terminal
R/P Head
Azimuth
Speaker
Terminal
TP803 * Adjust VR401 and VR402 for
400 Hz
580 + 20 mV reading on VTVM.
TRSOS 200nWb/m
Dolby Level
TP804
* Connect a jumper between TP801
and TP806.
* Apply 1 kHz, 150 mV to AUX INand
adjust Rec level volume at Dolby level.
* Adjust VR405 and VR406 for
0.53 0.02 mV reading on VTVM.
ALIGNMENT POINTS(CASSETTE TAPE DECK)
TP401 (L ch)
|
TP402 (R ch}
Rec Current
(Earth)
TP806
TP65
(Erase Bias)
VR801
(VU
LED
f
(Rec
Bias)
VR601
HY
VR802
wu
(Rec
Bias)
ED
VR803
VR602 |—-——+- a
(Dolby Level)
|
~
VR402
_———— ee
(Dolby Level)
i VvR401
(Earth)
(Rec Current)
VR406
7 (Rec Current)
VR405
(Earth)