– 10 –
SECTION 4
ELECTRICAL ADJUSTMENTS
PRECAUTION
1. The adjustment should be performed in the publication.
(Be sure to male playback adjustment at first.)
2. The adjustments and measurement should be performed for
both L-CH and R-CH.
• Switch position
DOLBY NR switch : OFF
DIRECTION switch : A
• Standard record position
Deliver the standard input signal level to input jack and set
the REC LEVEL (RV301) control to obtain the standard
output signal level as follows.
– Record Mode –
set
AF OSC
attenuator
600
Ω
10 k
Ω
LINE IN
+
–
LINE OUT
47 k
Ω
level meter
Mode Torque Meter Meter Reading
CQ-102C
30-65 g•cm
FWD
(0.42-0.90 oz•inch)
FWD 1.5-6 g•cm
Back tension (0.021-0.083 oz•inch)
CQ-102RC
30-65 g•cm
REV
(0.42-0.90 oz•inch)
REV 1.5-6 g•cm
Back tension (0.021-0.083 oz•inch)
70-130 g•cm
FF, REW CQ-201B
(0.98-1.80 oz•inch)
SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback/earth head pinch roller
rubber belts capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
Torque Measurement
Standard Input Level
Input terminal LINE IN
source impedance 10 kΩ
input signal level 0.5 V (– 3.8 dB)
Standard Output Level
Output terminal LINE OUT (L-CH)
load impedance 47 kΩ
output signal level 0.5 V (– 3.8 dB)
Test Tape
Type Signal Used for
P-4-A100 10 kHz, – 10 dB Azimuth Adjustment
P-4-L300 315 Hz, 0 dB PB Level Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
0 dB = 0.775 V
Test Mode
With the POWER turned OFF, short the test point CN801 (2P) on
the MAIN board (making IC801 pin &¢ “L”) and turn the POWER
ON. Thus, the TEST mode will be activated.
If a recording is done in the TEST mode, the REC MEMORY
mode becomes active where the tape is rewound by the amount of
recording when a rewinding is executed after recording.
After adjustment, make the CN801 (2P) open to release the TEST
mode.
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