Sharp CD-C500Z - Adjustment Procedures - Mechanical and Tape; Mechanism and Tape Section Adjustments; Bias and Erase Current Adjustments; Playback Amplifier Sensitivity Checks

ADJUSTMENT
As for preparation for adjustment, adjusting method and re-
placement of pickup refer to the relevant explanation in Service
Manual “ADJUSTMENT PROCEDURES OF AUDIO PRO-
MECHANISM SECTION
l Driving Force Check
Torque Meter
Specified Value
Tape 1
Play: TW-2412 Over 50 g
Tape 2 ’
Over 60 g
Reverse Play: TW-2422
Over 50 g
Over 60 g
l Torque Check
Torque Meter
Specified Value
Tape 1
Tape 2
Play: TW-2111 27 to 60 gem
27 to 60 g.cm
Reverse Play: TW-2121 27 to 60 gem
27 to 60 g.cm
Fast Forward: TW-2231 55 to 120 gem 55 to 120 g.cm
Rewind: TW-2231
55 to 120 g.cm 55 to 120 gem
l Head Azimuth
Test Tape Instrument Connection
MTT-114
Headphones socket
(Load resistance: 32 ohms)
l Tape Speed
Test Tape Adjusting Specified Instrument i
Point
Value
Connection
High Ml-T-1 11
Tape1 :
6,000 i
Speaker
speed*
VR404 100 Hz
terminal (Load
Tape2: resistance: 6 j
VR402 ohms)
Normal
MTT-111 Tape1 : 3,000 +
speed VR401
i 60 Hz
i Tape2: 1
VR403
*Short TP402 @ and TP402 0 when performing the high speed
adjustment.
TAPE SECTION
!
L
Position of each switch or control
Volume Max
Graphic Equalizer Center
Function Tape
Dolby NR
Off
Beat cancel
A
Tape selector
Normal
Dubbing speed
Normal
l Bias Frequency
Adjusting
Specified Value Instrument
Point !
Connection
L411
100 kHz
Q421 Emitter /
(BEAT CANCEL Switch : A)
l Bias Current
1 Adjusting Point
Specified Value Instrument ’
Connection
L: VR407 Normal: 20 i 3 V
L: Pin 1 of CNP404*
R: VR408 PI: Pin 5 of GNP404
l Erase Current Check
Resistor for measurement:
1 ohm
Specified Value
30i7mV
l Playback Amplifier Sensitivity
r Tast Tape
Adjusting
Specified
Point
Value
Instrument Connection 1
t
MT-T-1 50
L: VR405
1 R: VP,406
Normal: L: Pin3 of TP401
560 mV R: Pin1 of TP401
l Record /Playback Sensitivity (Tape 2)
Test Tape: UR-121
Input Level Adjusting
Specified
Instrument Connection
Point
Value
l 1
L: VR409 Ret Level: Input: AuxAIideo
R: VR410 103 mV Output: TP401
* 1: Adjust the oscillator so that TP401 output is 103 mV in the
recording mode.
l Playback Amplifier Sensitivity Check
Test Tape 1 Specified Instrument
Value
Connection
2.7 V + 3dB Speaker terminal
(Load resistance:6 ohms)
Figure 18 ADJUSTMENT POINTS
- 18-