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MODEL CP430/PMD430 STEREO CASSETTE RECORDER
INTRODUCTION
1. SHOCK, FIRE HAZARD
SERVICE
TEST:
CAUTION:
After
servicing
this appliance
and prior to
returning
to. customer,
measure
the
resistance
between
either primary
AC cord connector
pins (with unit NOT
connected
to AC
mains and its Power
switch
ON), and
the face or front Panel of product and contrnis and chassis
button.
Any resistance measurement less than 1 Megohms should
cause unit to be reparied or corrected
before AC power
is applied, and verified before return to user/customer.
Ref. UL Standard
NO.
1270. Para 66. 3. D (Mandatory
Test after servicing Electrical Appliances, effective 7-1-83).
2. PW. BOARDS
As can be seen from the circuit diagram, the chassis of
your Cassette
Recorder
consists of the following units.
Each unit mounted on a printed circuit board is described
within the square enclosed by a bold dotted line on the cir-
cuit diagram.
3. TEST EQUIPMENT REQUIRED FOR
SERVICING
VTVM
Audio Oscillator (AF OSC)
Attenuator (600 2)
Oscilloscope
Bandpass Filter (1 kHz)
IEC A-Curve Filter
Wow and Flutter Meter
Torque Meter (Cassette Type)
Digital Frequency Counter
Distortion Meter
Blank Tapes (Completely erased with bulk eraser)
TDK AC-212 (Normal)
TDK AC-512 (Special/CrO, )
TDK AC-712' (Metal)
NOTE:
If any doubt is noted in a measured value, use new
tape.
© Test Tapes
(New Tape)
MTT-111
Wow and Flutter, Tape Speed
MTT-112
Measurements of Output Level
MTT-112B
Signal-to-Noise Ratio
MTT-150
Adjustment of Output Level
MTT-256
Frequency Response (for Normal)
MTT-356
Frequency Response (for Special/
CrO2 and Metal)
MTT-121
Cross Taik
MTT-141
Channel Separation
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