Adjustment; Test Mode - Pioneer CT-IS21 Service Manual

6. ADJUSTMENT

6.1 TEST MODE

How to Enter the Test Mode
Receive "A15F" (Bus code 1C5F) with the remote control unit or
plug the power cord into the AC socket with the TEST MODE JP
(W101 and W102) on the U-COM Assy short-circuited.
TEST MODE
Short point
Front
U-COM ASSY
SIDE A
Fig. 6-1 Test mode
Operation of the Test Mode
1. LED check mode
When pressing the REVERSE MODE key, LED indication
changes as follows.
→ Normal display → All LED lights → All LED lights out
∗ STANDBY LED is not able to controlled with the microcomputer
because of it's lighted with the hardware.
2. When pressing the EJECT key, the Cassette mecha. SW check
mode is reached and LED displays as follows.
LED SW
Enable the FWD
DIR FWD FWD REC SW
recording
Enable the REV
DIR REV REV REC SW
recording
PLAY HALF SW Tape exist
REC TAPE TYPE NORMAL
ON OFF
Disenable the FWD
recording
Disnable the REV
recording
No Tape
CrO
2
3. When pressing the ASES key, the Auto-recording/playback
operation mode is reached and perform the following operation.
1 Function is set to AUX.
2 FWD recording is performed for 4 seconds.
3 REV recording is performed for 4 seconds.
4 FWD playback is performed for 4 seconds. (Function becomes
TAPE).
5 Stop
4. The same operation as before can be performed with the key except
for the REVERSE MODE and ASES keys.
However, the REVERSE mode should endless fix for ageing.
LINE MUTE (PB MUTE) is opened in the REC pause and
recording status.
Cancellation of the Test Mode
Press the "STANDBY/ON" key or disconnect the AC power cord.
About the Mechanism Ageing Mode
When pressing the ASES and STOP keys for 3 seconds in the wall
outlet on, Deck power is on and the ageing mode is reached.
PLAY indicator starts flashing when enter the ageing mode.
6.2 ADJUSTMENT
Adjustment Condition
(1) Clean the heads and demagnetize them using a head eraser.
(2) Set the measurement level to 0 dBV = 1 Vrms.
(3) Use the specified tape for adjustment. Use the labeled (A) side
of the test tape.
NCT–111 : For Tape Speed Adjustment
: For Head Azimuth Adjustment
STD-331E : For Playback Level Adjustment
: For Playback Frequency Adjustment
STD–632 : Normal blank tape
STD–622 : CrO blank tape
2
(4) Provide yourself with the following measuring devides:
• AC millivoltmeter
• Low-frequency oscillator
• Attenuator
• Oscilloscope
(5) Adjust both right and left channels unless otherwise specified.
(6) Turn the DOLBY NR switch off unless otherwize specified.
(7) Warm up the unit for several minutes before adjustment. In
particular, be sure to warm up the unit in the REC/PLAY mode
for 3 to 5 minutes before starting recording/playback frequency
characteristics adjustment.
(8) Always follow the indicated adjustment order.
Otherwise, a complete adjustment may not be achieved.
CT-IS21
27