9
ADJUSTMENT
VR101
VOLUME
PHONES
J102
MAIN C.B
A
R117
R118
R116
IC101
3
SFR101
A
C
B
1
1
3
2
TP1
(R-CH)
(L-CH)
TP2
2
<TAPE SECTION>
Tape speed :
3015Hz ± 60Hz
Wow :
Less than 0.5% (RMS)
Take-up torque :
24 ~ 45g-cm (FWD)
F.F torque :
70 ~ 150g-cm
REW torque :
70 ~ 150g-cm
Back tension :
1.5 ~ 4.0g-cm (FWD)
S/N ratio :
More than 42dB (PB, DC)
Distortion :
Less than 3.0% (PB, DC)
Noise level :
Less than 3.5mV
(Vol MAX, PB, DC)
Less than 0.40mV
(Vol MIN, PB, DC)
Frequency response :
63Hz + 1 / – 7dB ~ 8kHz + 4 / – 4dB
(NORMAL)
63Hz + 1 / – 7dB ~10kHz + 4 / – 6dB
(CrO2)
Test tape :
TTA– 100
TTA–320(NORMAL)
TTA–310(CrO2)
PRACTICAL SERVICE FIGURE
10
<TAPE PLAYER SECTION>
1. Tape Speed Adjustment
Settings :
• Test tape :
TTA–100 (Tape center)
• Test point :
PHONES (J101)
• Adjustment location : SFR101
• MSP :
CLASSIC
• TAPE SELECTOR : NORM
• VOLUME :
MAX
Method :
Play back (FWD) the test tape and adjust
SFR101 so that the frequency becomes
3010Hz ± 10Hz. Then confirm WOW is less
than 0.50%.
2. Dolby Level Adjustment
Settings :
• Test tape :
TTA–200
• Output test point :
Dolby test point
TP1(Lch),TP2(Rch)
• DOLBY NR :
OFF
• TAPE SELECTOR : NORM
Method :
Play back (FWD) the test tape and adjust
SFR103 (Lch) and SFR102 (Rch) so that the
test point becomes 100mV ± 1 dB.
3. GOVERNER Adjustment
Perform the STOP —> PLAY and REVERSE operations
(or PAUSE ON —> OFF) after the motor is replaced.
When the tape starts running smooth, this adjustment
is not necessary. If wow is conspicuous at the beginning
of the tape-run, perform this adjustment following the
procedures below.
Open
Solder
Solder
Solder
Soder
Open
Solder
Solder
Pattern
(Procedure
1 above)
Step (1)
Step (2)
Medium
resistance
(B)
Low
resistance
(A)
High
resistance
(C)
Solder
1) Solder resistor pattern (A) of the MOTOR AND
GOVERNOR MATCHING ADJ. resistor group.
2) Set the tape speed (using speed adjustment SFR101).
3) Restrict the motor rotation by hand (or turn PAUSE ON).
4) Remove your hand and listen to the beginning of the
tape-run.
5) When the rise of tape running is smooth, no more
adjustment is necessary.
If wow continues for 1 to 2 seconds at the rise time,
change the combined resistance according to procedure
6 and check that the tape starts running smooth.
6) Solder the resistor pattern according to the table below
(NOTE :
=10ohm ,
=2.7ohm ,
=4.7ohm)
7 )
Finally re-check the tape speed.
Caution : Cool the patterns down to normal tempera-
ture after soldering. If the pattern remains
heated, the gorvernor circuit does not opeate
normally.
A
B
C
Summary of Contents for HS-GM700MK3
Page 4: ...WIRING 1 MAIN 6 5...
